Print Page | Close Window

UBC Auto-X July 26th

Printed From: West Coast Fieros
Category: Events Section
Forum Name: Meetings, and Events Info
Forum Description: What Happened at the Last Meeting/Drive, When's the Next Meeting or Drive?
URL: http://www.westcoastfieros.com/forum/forum_posts.asp?TID=1427
Printed Date: 06 April 2025 at 4:38am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com


Topic: UBC Auto-X July 26th
Posted By: Bassman
Subject: UBC Auto-X July 26th
Date Posted: 10 July 2009 at 7:24am


Ladies and gentlemen, this is not just another autocross! The UBC Sports Car Club is proud to announce the SUPERSIZED "Summer Auto-X #3" at the BC Driving Centre. For this date only, the UBCSCC has secured use of the adjacent runway for parking and staging allowing us to use the whole skidpad for autocross goodness! What this means to you is an extra long course without repetitive loops! We are aiming for a 60 second high average speed course with a variety of interesting elements allowing for different lines and driving styles.

THANKS TO OUR SPONSORS FOR 2009, TOYO TIRES, THE DRIVER WITH THE LOWEST INDEXED TIME OF THE DAY WILL RECEIVE A FREE SET OF TOYO R888 RACE TIRES!!!



UBCSCC Summer Auto-X #3 SUPERSIZED
Date: Sunday, July 26th, 2009
http://www.karelo.com/register.php?BID=214&BT=10#Ev7785" class="postlink - Membership Required
Location: http://www.ubcscc.com/autoxfaq.shtml#bcdc" class="postlink - BC Driving Centre
Cost: $40 by pre-registration via Karelo only

Registration will open Sunday @ 6:00pm automatically.

BY SIGNING UP YOU ACKNOWLEDGE THAT YOU HAVE READ AND AGREE TO ALL CONDITIONS OF THE SUPPLEMENTAL REGULATIONS. Any violations of these regulations will result in an immediate end to your day without refund. New regulations are in place regarding refunds & substitutions, registration, and noise limits - please read BEFORE signing up.
http://www.ubcscc.com/events/2009/summerax3/suppregs.html" class="postlink - Supplemental Regulations

Please note that this event is capped at 60 people plus UBCSCC execs & volunteers. Pre-registration via Karelo is mandatory. As outlined in the supplemental regulations, there will be absolutely no refunds or driver substitutions - if you are not sure you can attend, please do not pre-register.

There is absolutely ZERO TOLERANCE for any burnouts, reckless driving, or loud stereos on Ford Road at any time. Anyone caught breaking this rule will be immediately, and permanently, banned from all 3 local autocross clubs without warning.

Please note: Tech closes at 9:00am sharp. If you are changing tires, this must be complete before you go through the tech inspection. Registration check-in closes at 9:10am sharp.

Hope to have you all out!
Good luck from all of us in your UBCSCC Executive Team.
_________________
Mark Uhlmann
UBCSCC President
SM #67 95 Honda Civic





-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">



Replies:
Posted By: Patrick
Date Posted: 10 July 2009 at 12:04pm

It's too bad that date conflicts with the camping weekend that some club members will be participating in.

 



Posted By: Capt Fiero
Date Posted: 10 July 2009 at 12:59pm

 

       Most of the guys that "would be going" would only be spectators, as it appears to be a members only event.  To my knowledge only Brian and Austin are licensed members with the racing club.  It would have been nice to go out and watch, however instead of sweating on a hot Tarmac fighting to keep hydrated, and stave off a major sunburn, I'll be resting my feet in a cool river, with cocktail in one hand and a laptop on my lap surfing Fiero Racing movies and browsing Fiero websites.

 Ah hell who am I kidding, if I had the option to actually go racing, (car and driver prepared)  I would be all over it.  Oh, I want my V8 back on the road.  I think I am going to go and work on it now.  C-Ya.



-------------
Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.


Posted By: Bassman
Date Posted: 10 July 2009 at 12:59pm
I know...I'll post vid and pics:)

-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Bassman
Date Posted: 10 July 2009 at 3:54pm
Well I have my buddy Larry with some used (better than what I have currently) RComps in 205/15/50 that I may just for this event...install on my stock rims and he would bring them to the race in his car and install on site (like allot do)...and free tread:)...just need to pay for the install/balance.

I have left Austin a message as this event would be like the US courses...long and no double loops:), simular to SOLO Sprint at the KUMHO Challenge last year (or this August).

If this event was not on the radar, we would drop by for a visit, but I need the racing rush:)


-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Austin
Date Posted: 12 July 2009 at 8:16pm

Hey all.. Thanks Brian for the heads up, sorry I missed your call.

Unfortunately been sick in bed all weekend since Friday with a stomach flu   The event sounds pretty freakin sweet though so I've signed up!   Will be going over the usual checkups on the car this week in anticipation to this AutoX.  BTW Nice score on the Rcomps!  That would be the way i woudl go too, sticky tires on factory 15's.  17's are just waaaay too heavy, not only wheel weight but tire weight as well.  I'm almost tempted to try running my factories w/ All Season tires to see how they handle being pushed.

Cheers!



-------------

1986 Fiero GT 3.4L V6 DIS, 5 spd, Full Polyurethane Suspension, Rear Coil-overs


Posted By: Bassman
Date Posted: 12 July 2009 at 10:20pm
Cool...just signed up also:)...and I spoke with Larry and he said I'll get 3-6 hard autox days in, and new they would be 30 treadwear:), so they will act more like 50 at their current shape...but WAY stickier than what I have.  I am calling my buddy at OK Tire and see how much, pick up the tread from Larry and install...then he'll bring them out:), he's being really cool about this and wants to see how they help the Fiero:)...hope the suspension holds:)

Well the additional positive...if I have any problems, I'll have my 17's:)...it will be cool to run the stocks, you should:).  Call me as I am off this week also, maybe hook up later in the week...cheers


-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Bassman
Date Posted: 27 July 2009 at 10:43am
All I can say is wow, what a day:).  As all of us experienced, mother nature was out in full force and made life interesting:).

1st day with the Rcomps, and right from the 1st run...OMG!!!, then when they warmed up, I had a HUGE smile:)...lol.  Now the whole therory of what do you need to Autox...Tires!.  If one invests in good tires, then it's about power, or torque to get to that next gate real quick:)

The pics below show the highlights of happy moments as I had my challenges.  The main issue as David can attest too is the threads on a few of my wheels, pretty much stripped, need to get these fixed & cleaned up.  The main issue happened at the end of the day where the right side jack point slipped, and if it was not for my 17" rims catching the car and the jack holding and bending the rocker panel and allowing some clearance to get the emergency jack under, I would have been farked!...all you could hear as the car almost came down on me was "HELP"!!!...lol, my buddies ran over and if it was again not having a bit of space due to above...the right rear would have been rotors on ground:(...sorry, did not get any pics during this time...lol

Now looking at the jack point, you'll see how it's bent/stripped...Austin gave me a great suggestion with my jack and take off the rubber pad for future...but I am sure this will still be strong enough to jack under right?.

Here are some pics and a vid, enjoy:













http://s170.photobucket.com/albums/u243/Bassman68/Autocross%20Races/?action=view&current=UBCJuly265thrun.flv">


-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Patrick
Date Posted: 27 July 2009 at 11:28am

Second gear got quite a workout, eh?

Brian, any chance for one run that you could do it with the windows rolled up? It would be great to hear on the video what the car actually sounds like going around the track without wind noise ruining the audio.

Thanks for the pics and video. Looks like fun!

 



Posted By: Bassman
Date Posted: 27 July 2009 at 11:40am
2nd gear certainly did...have the rev limiter at 6000k.  As for the windows it's a rule you have to have them down in case of emergency, as well passengers have to have all arms in, etc.

Try this vid, I think you can hear the engine better...As for my jack point, this it's strong enough for future Patrick?

http://s170.photobucket.com/albums/u243/Bassman68/Autocross%20Races/?action=view&current=UBCJuly26th7thrun.flv">




-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Patrick
Date Posted: 27 July 2009 at 2:01pm

Originally posted by Bassman Bassman wrote:

As for my jack point, think it's strong enough for future Patrick?

How the heck did it occur anyway? Looks to me like the inside lip of the jack was between the two layers of metal instead of being completely behind the second layer.

Can you bend that outside layer of metal back down? I'm definitely no expert (and several guys here would probably know more than me on this), but I suspect with that piece of metal bent back down it would be fine.

Originally posted by Bassman Bassman wrote:

Try this vid, I think you can hear the engine better.

Yeah, that's a little better. Does your camera have a remote mic input? If it does, you could mount the mic where the wind doesn't affect it. 

If you can't use a remote mic, you could try putting a piece of material over the mic on the camera. It would hopefully work like a "windsock" on a boom mic.

They talk about it doing that http://www.hv20.com/showthread.php?p=15670 - Here , or you can watch this video http://www.youtube.com/watch?v=nao9KGc6VTM&fmt=18 - Here where the fella tried something very simple...

(Question for the moderators - Is there a way to embed YouTube videos in our posts here like we can do at Pennock's?)

 



Posted By: Bassman
Date Posted: 27 July 2009 at 4:08pm
Austin...results in:)...what an improvement, for top times out of 64 drivers, I came in 21st:)...all I can say is OMG:)

Results:
http://www.ubcscc.com/events/2009/summerax3/t.txt" class="postlink - Top Times
http://www.ubcscc.com/events/2009/summerax3/i.txt" class="postlink - Indexed Times
http://www.ubcscc.com/events/2009/summerax3/r.txt" class="postlink - Complete Results



-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Bassman
Date Posted: 27 July 2009 at 4:14pm
Originally posted by Patrick Patrick wrote:

Originally posted by Bassman Bassman wrote:

As for my jack point, think it's strong enough for future Patrick?

How the heck did it occur anyway? Looks to me like the inside lip of the jack was between the two layers of metal instead of being completely behind the second layer.

Can you bend that outside layer of metal back down? I'm definitely no expert (and several guys here would probably know more than me on this), but I suspect with that piece of metal bent back down it would be fine.

Pretty much it looks like I did not have the jack face flush, so when I had to pump it up that 1 cm I needed, that wheels on the jack may had dug in and not moved and adjusted to the new height.  My buddy with the Porche club posted this...I am heading to his place tomorrow night and see what we can do...any other suggestions, I am all ears:

Brian: Ouch! If I were you I'd probably clean up the metal, spray it with zinc, then tack weld the pieces together. Follow up with some more zinc. Once metal is bent it has gone through some fatigue. It would be good to attach the folded bit to the straight bit with some tack welds.

I may just put on the tires and drive to the next three event days, then no rush for tech and won't have to deal with changing tires in the heat, etc...think heat & fatigue played a role in my accident yesterday.

QUOTE=Bassman]Try this vid, I think you can hear the engine better.

Yeah, that's a little better. Does your camera have a remote mic input? If it does, you could mount the mic where the wind doesn't affect it. 

If you can't use a remote mic, you could try putting a piece of material over the mic on the camera. It would hopefully work like a "windsock" on a boom mic.

They talk about it doing that http://www.hv20.com/showthread.php?p=15670 - Here , or you can watch this video http://www.youtube.com/watch?v=nao9KGc6VTM&fmt=18 - Here where the fella tried something very simple...

Unfortunatly it's a Sony Cybershot camera...lol, nice and simple, there is a camera unit that some use for racing but over $400

(Question for the moderators - Is there a way to embed YouTube videos in our posts here like we can do at Pennock's?)

 

[/QUOTE]

-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Austin
Date Posted: 27 July 2009 at 7:37pm

Originally posted by Bassman Bassman wrote:

Austin...results in:)...what an improvement, for top times out of 64 drivers, I came in 21st:)...all I can say is OMG:)

So jealous of your RComps  Oh well at least i'm not the slowest, close!

Video of one of my runs:

http://s286.photobucket.com/albums/ll117/AustinFiero944/?action=view&current=2009-July26th-PittMeadowsAutoX-Run4.flv">



-------------

1986 Fiero GT 3.4L V6 DIS, 5 spd, Full Polyurethane Suspension, Rear Coil-overs


Posted By: Patrick
Date Posted: 27 July 2009 at 7:54pm

Originally posted by Bassman Bassman wrote:

Unfortunatly it's a Sony Cybershot camera...lol, nice and simple

The fella in the video is using a similar camera. He demonstrates an oh-so-simple modification that makes quite a difference with the audio.

Originally posted by Patrick Patrick wrote:

...or you can watch this video http://www.youtube.com/watch?v=nao9KGc6VTM&fmt=18 - Here where the fella tried something very simple...

http://www.youtube.com/watch?v=UzI8Zxf1dcA&feature=related&fmt=18 - Here's another one.

 



Posted By: Capt Fiero
Date Posted: 27 July 2009 at 8:20pm
The home made wind muffler, even simpler than trying to find the packing foam, is just using a cotton ball loosely taped over the microphone.

-------------
Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.


Posted By: Bassman
Date Posted: 27 July 2009 at 8:52pm
I only see 3 little holes on 2 spots on the camera...I'll try to play with it, but for this weekend it will be tough as I have a stupid crazy week:(

-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Bassman
Date Posted: 27 July 2009 at 9:38pm
Originally posted by Austin Austin wrote:

Originally posted by Bassman Bassman wrote:

Austin...results in:)...what an improvement, for top times out of 64 drivers, I came in 21st:)...all I can say is OMG:)

So jealous of your RComps  Oh well at least i'm not the slowest, close!

Video of one of my runs:

http://s286.photobucket.com/albums/ll117/AustinFiero944/?action=view&current=2009-July26th-PittMeadowsAutoX-Run4.flv">



Great vid Austin, you pre turn much better than I do...need to work on that for this weekend...going to miss ya for the next few events:(...have fun though:)


-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Capt Fiero
Date Posted: 27 July 2009 at 10:07pm

Hey Brian now all we got to do is get you into some lightweight 14" wheels or go with something like 12" diameter by 10" wide full race wheels.  

 

Congrats to the both of you, you are making Fiero owners proud all over the world.  (well at least in our section of it)

 

 



-------------
Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.


Posted By: Bassman
Date Posted: 29 July 2009 at 6:52pm
Some pics that came in:

http://www.flickr.com/photos/33197977@N06/sets/7215762174918 9867/


-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Romeo
Date Posted: 29 July 2009 at 9:20pm
Originally posted by Capt Fiero Capt Fiero wrote:

Hey Brian now all we got to do is get you into some lightweight 14" wheels or go with something like 12" diameter by 10" wide full race wheels.  

 

Congrats to the both of you, you are making Fiero owners proud all over the world.  (well at least in our section of it)

 

 


Pfft, 12" is SO yesterday. This is what he needs.
http://www.billetspecialties.com/item.asp?cid=16&scid=257&pid=964 - http://www.billetspecialties.com/item.asp?cid=16&scid=25 7&pid=964

Those rims are sex in circular form.

-------------
Never shift into reverse without a back-up plan.


Posted By: Bassman
Date Posted: 30 July 2009 at 5:18am
lol...

-------------
Brian (Bassman)

86 GT Fastback 3.2L

2013 Mazda3 Sport GS SkyActive

[IMG]http://i170.photobucket.com/albums/u243/Bassman68/BassmanSignature.png">


Posted By: Romeo
Date Posted: 30 July 2009 at 8:31pm
Come on Brian, you were thinking it too.

-------------
Never shift into reverse without a back-up plan.


Posted By: Capt Fiero
Date Posted: 30 July 2009 at 8:46pm

Na like I was telling Brian when he started this whole racing bug, smaller is better.   The smaller the outside diameter of the wheel, and the shorter the overall tire/wheel combo the quicker the car will accelerate due to the effective gear ratio change.   Going from say a 26" tall tire and wheel package down to a 23" tale tire and wheel package, the difference is amazing.  Acceleration is much faster coming out of a corner, braking is increased drastically, the only draw back is reduced top speed, however if you are never red-line at top gear, the point is null.      We really need to set up Lisa's old tires on a car, say a set of full size 17s or 18s and let people try the difference.  

These sizes will both fit on a stock or lowered Fiero.

Note the overall size is a whopping 4 inches difference, which would result in a 2" drop to your car going from one size to the other, or a 2" lift if you started with the smaller size and moved to the larger size.

Just a side note, on a Fiero that is dropped 2" the max you can go is a 26.88" tall rear tire.  Unless you have some serious back space on the wheels. 

     Also note that you know have a 15% change in gearing, which is a substantial change.   Go to the website and play with sizing.   I think we found one day, that you can go with a 22" wheel on a Fiero and with a low enough profile tire, not even make the speedo change.

 

This program has been used approximately times.

------------------------------------------------------------------------------

DML Tire and Wheel Calculator Results

------------------------------------------------------------------------------


 

Dimensions

Dimension Tire A: 205/40 R 16
(22 x 8.07 x 16)
Tire B: 225/60 R 16
(27 x 8.86 x 16)
Difference
Width
Sidewall height
Overall height
Circumference
8.07" (205.00mm)
3.23" (82.00mm)
22.46" (570.40mm)
70.55" (1791.96mm)
8.86" (225.00mm)
5.31" (135.00mm)
26.63" (676.40mm)
83.66" (2124.97mm)
+0.79" (+20.00mm)
+2.09" (+53.00mm)
+4.17" (+106.00mm)
+13.11" (+333.01mm)


 

Speedometer Error

Actual Speed Indicated Speed with Tire B Speedometer Error
5 mph (8.04 kph) 4.22 mph (6.78 kph) -0.78 mph (-1.26 kph)
10 mph (16.09 kph) 8.43 mph (13.57 kph) -1.57 mph (-2.52 kph)
15 mph (24.13 kph) 12.65 mph (20.35 kph) -2.35 mph (-3.78 kph)
20 mph (32.18 kph) 16.87 mph (27.14 kph) -3.13 mph (-5.04 kph)
25 mph (40.23 kph) 21.08 mph (33.92 kph) -3.92 mph (-6.30 kph)
30 mph (48.27 kph) 25.30 mph (40.71 kph) -4.70 mph (-7.56 kph)
35 mph (56.31 kph) 29.52 mph (47.49 kph) -5.48 mph (-8.83 kph)
40 mph (64.36 kph) 33.73 mph (54.27 kph) -6.27 mph (-10.09 kph)
45 mph (72.41 kph) 37.95 mph (61.06 kph) -7.05 mph (-11.35 kph)
50 mph (80.45 kph) 42.16 mph (67.84 kph) -7.84 mph (-12.61 kph)
55 mph (88.50 kph) 46.38 mph (74.63 kph) -8.62 mph (-13.87 kph)
60 mph (96.54 kph) 50.60 mph (81.41 kph) -9.40 mph (-15.13 kph)
65 mph (104.58 kph) 54.81 mph (88.20 kph) -10.19 mph (-16.39 kph)
70 mph (112.63 kph) 59.03 mph (94.98 kph) -10.97 mph (-17.65 kph)
75 mph (120.67 kph) 63.25 mph (101.76 kph) -11.75 mph (-18.91 kph)
80 mph (128.72 kph) 67.46 mph (108.55 kph) -12.54 mph (-20.17 kph)
85 mph (136.76 kph) 71.68 mph (115.33 kph) -13.32 mph (-21.43 kph)
90 mph (144.81 kph) 75.90 mph (122.12 kph) -14.10 mph (-22.69 kph)
95 mph (152.85 kph) 80.11 mph (128.90 kph) -14.89 mph (-23.95 kph)
100 mph (160.90 kph) 84.33 mph (135.69 kph) -15.67 mph (-25.21 kph)
105 mph (168.94 kph) 88.55 mph (142.47 kph) -16.45 mph (-26.48 kph)
110 mph (176.99 kph) 92.76 mph (149.25 kph) -17.24 mph (-27.74 kph)
115 mph (185.03 kph) 96.98 mph (156.04 kph) -18.02 mph (-29.00 kph)
120 mph (193.08 kph) 101.19 mph (162.82 kph) -18.81 mph (-30.26 kph)
125 mph (201.12 kph) 105.41 mph (169.61 kph) -19.59 mph (-31.52 kph)
130 mph (209.17 kph) 109.63 mph (176.39 kph) -20.37 mph (-32.78 kph)
135 mph (217.22 kph) 113.84 mph (183.17 kph) -21.16 mph (-34.04 kph)
140 mph (225.26 kph) 118.06 mph (189.96 kph) -21.94 mph (-35.30 kph)
145 mph (233.31 kph) 122.28 mph (196.74 kph) -22.72 mph (-36.56 kph)
150 mph (241.35 kph) 126.49 mph (203.53 kph) -23.51 mph (-37.82 kph)
155 mph (249.40 kph) 130.71 mph (210.31 kph) -24.29 mph (-39.08 kph)
160 mph (257.44 kph) 134.93 mph (217.10 kph) -25.07 mph (-40.34 kph)
165 mph (265.49 kph) 139.14 mph (223.88 kph) -25.86 mph (-41.60 kph)
170 mph (273.53 kph) 143.36 mph (230.66 kph) -26.64 mph (-42.87 kph)
175 mph (281.57 kph) 147.58 mph (237.45 kph) -27.42 mph (-44.13 kph)
180 mph (289.62 kph) 151.79 mph (244.23 kph) -28.21 mph (-45.39 kph)
185 mph (297.67 kph) 156.01 mph (251.02 kph) -28.99 mph (-46.65 kph)
190 mph (305.71 kph) 160.22 mph (257.80 kph) -29.78 mph (-47.91 kph)
195 mph (313.75 kph) 164.44 mph (264.59 kph) -30.56 mph (-49.17 kph)
200 mph (321.80 kph) 168.66 mph (271.37 kph) -31.34 mph (-50.43 kph)


If your speedometer has been calibrated for 205/40 R 16 (22 x 8.07 x 16) tires, replacing them with 225/60 R 16's (23 x 8.86 x 16's) would result in the speedometer reading low by 15.67%.




 

Odometer Error

Actual Mileage Indicated Mileage with Tire B Odometer Error
1 mi (1.61 km) 0.84 mi (1.36 km) -0.16 mi (-0.25 km)
5 mi (8.04 km) 4.22 mi (6.78 km) -0.78 mi (-1.26 km)
10 mi (16.09 km) 8.43 mi (13.57 km) -1.57 mi (-2.52 km)
50 mi (80.45 km) 42.16 mi (67.84 km) -7.84 mi (-12.61 km)
100 mi (160.90 km) 84.33 mi (135.69 km) -15.67 mi (-25.21 km)
500 mi (804.50 km) 421.64 mi (678.43 km) -78.36 mi (-126.07 km)
1000 mi (1609.00 km) 843.29 mi (1356.85 km) -156.71 mi (-252.15 km)
5000 mi (8045.00 km) 4216.44 mi (6784.25 km) -783.56 mi (-1260.75 km)
10000 mi (16090.00 km) 8432.88 mi (13568.50 km) -1567.12 mi (-2521.50 km)
50000 mi (80450.00 km) 42164.40 mi (67842.52 km) -7835.60 mi (-12607.48 km)
100000 mi (160900.00 km) 84328.80 mi (135685.03 km) -15671.20 mi (-25214.97 km)


Same as with the speedometer, if your odometer has been calibrated for 205/40 R 16 (22 x 8.07 x 16) tires, replacing them with 225/60 R 16's (27 x 8.86 x 16's) would result in the odometer reading low by 15.67%.



 

Effective Gear Ratio Change

Rearend ratio with 205/40 R 16's Rearend ratio with 225/60 R 16's
3.55 2.99

As far as gearing goes, if you have a 3.55 rearend and 205/40 R 16 tires (22 x 8.07 x 16), changing to 225/60 R 16's (27 x 8.86 x 16's) would be the same as if you kept your current wheels and tires but changed your rearend gears to 2.99's


 

RPM Change

RPM with 205/40 R 16's RPM with 225/60 R 16's
6000 5059

Replacing your 205/40 R 16 (22 x 8.07 x 16) tires with 225/60 R 16's (27 x 8.86 x 16's) would lower your finish line RPM by 941 RPMs.


 


http://www.dakota-truck.net/TIRECALC/tirecalc.html - Back to the DML Tire Calculator page
http://www.dakota-truck.net/">Go http://www.dakota-truck.net/ - Back to the DML Home Page



-------------
Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.


Posted By: Capt Fiero
Date Posted: 30 July 2009 at 9:01pm

 

     Ya a 225/20/22 tire will fit and not even throw the speedo off.

225mm wide

20 series profile

22" wheel



-------------
Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.


Posted By: Patrick
Date Posted: 30 July 2009 at 11:45pm

Originally posted by Capt Fiero Capt Fiero wrote:

20 series profile

Ugh, no thanks, not for street use anyway. I think you'd feel every pebble on the road with such low profile tires. I don't even like the 50 series tires I have on my GT. Next tires will be 60's.

I'm old school. I like to see some meat on my wheels, not thin little rubber bands.

 



Posted By: Capt Fiero
Date Posted: 31 July 2009 at 6:16am

You do know that the profile is not a given number, the profile or series is a measurement of the width, a 20 series 20 is simply 20% of the width.

Or a 215/50/15 has a sidewall that is 50% of 215mm, which is roughly 107mm tall sidewall.    

       OK everybody follow that, take the width of the tire, divide by the profile and you get the sidewall height.

So Patrick in your case, I would stay with the 50 series and move to a tire that is 20mm wider.  This will get you a nice meaty looking tire and increase your sidewall to make it a bit more mushy at the same time.



-------------
Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.


Posted By: Romeo
Date Posted: 31 July 2009 at 6:19am
Originally posted by Patrick Patrick wrote:

Originally posted by Capt Fiero Capt Fiero wrote:

20 series profile

Ugh, no thanks, not for street use anyway. I think you'd feel every pebble on the road with such low profile tires. I don't even like the 50 series tires I have on my GT. Next tires will be 60's.

I'm old school. I like to see some meat on my wheels, not thin little rubber bands.

 


Ah, I grew up looking at Formula technology. You thin out the sidewalls and during cornering your car will tend not to "lean over" it's point of contact. As your aware, if you can keep your point of contact and point of load in parralel, you gain a significant amount of cornering ability, which is why manufacturers spend so long designing their steering knuckles and suspension (Due to SAI, Included Angle, Caster and Scrub Radius). David does have a legitamite point, but then again, it wouldn't be all good for example. A closer range transmission means more shifts, and in a racing type like autocross, that could get quite tiresome (This is overlooking the power loss during each shift). And Patrick, the style you like is good for drag racing, as it allows the car to spin the axles and inside portion of the tire slightly, before the outside finally tries to catch up and snaps forward like a rubber band, giving a touch more grunt to the sixty foot mark.

-------------
Never shift into reverse without a back-up plan.


Posted By: Patrick
Date Posted: 01 August 2009 at 12:17am

A tire size/speedometer reading calculator I've used a lot and liked is this one http://www.miata.net/garage/tirecalc.html - Here .

 



Posted By: Patrick
Date Posted: 01 August 2009 at 12:26am

Originally posted by Romeo Romeo wrote:

And Patrick, the style you like is good for drag racing, as it allows the car to spin the axles and inside portion of the tire slightly, before the outside finally tries to catch up and snaps forward like a rubber band, giving a touch more grunt to the sixty foot mark.

Sounds like you're describing "wrinkle slicks".

 



Posted By: Romeo
Date Posted: 01 August 2009 at 1:12am
That's a drastic example of it, but the any time profile is increased, you'll get a minor spring sensation from when the tires hook up. Still, both your and David's tire ideas would have trouble keeping up to the 15" wide tire contact patch of the rims I linked. If you managed to somehow stuff them into Fiero wheel wells. 

-------------
Never shift into reverse without a back-up plan.


Posted By: Capt Fiero
Date Posted: 01 August 2009 at 11:53am

Romeo sorry to burst your tire here, but in the grander scheme of things, and the reason no one runs much bigger than a 10" slick on a Fiero is, nothing else in a Fiero can handle that much traction.  Long before you break traction on a 10 slick in a Fiero, you'll shatter CV shafts, blow up even the most radical of trans axles, motor mounts would be turned into pretzels faster than you can think.   I use to run a 9.64 inch rear street tire (not a even a drag tire) on my back of my V8 car and I actually dropped it back to an 8.8" street tire because I got tired of breaking parts.  Its much cheaper to replace burnt tires than blown clutches or trans axles.   I still kill mounts, but not nearly as bad.     With the big tires, I could litterly at will, put new mounts in the car, take it out, rev the clutch dump it hard, and pull it back into the driveway to replace my now destroyed mounts.



-------------
Capt Fiero
88 Fiero GT 5spd V6
Eight Fifty Seven GT V8 5spd.


Posted By: Romeo
Date Posted: 02 August 2009 at 12:26am
Not when I install my LS9 with the LS4 transmission, and custom built drive axles. Then will see who's laughing! Mua ha ha ha! Bubble un-burst! All I need to do now is win multiple lotteries.

-------------
Never shift into reverse without a back-up plan.



Print Page | Close Window

Forum Software by Web Wiz Forums® version 12.01 - http://www.webwizforums.com
Copyright ©2001-2018 Web Wiz Ltd. - https://www.webwiz.net