F40 Questions
Printed From: West Coast Fieros
Category: General Fiero Chat
Forum Name: General Talk about Fieros
Forum Description: Just want to chat about fieros? here's the place to make that happen.
URL: http://www.westcoastfieros.com/forum/forum_posts.asp?TID=3189
Printed Date: 22 November 2024 at 2:49pm
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com
Topic: F40 Questions
Posted By: Romeo
Subject: F40 Questions
Date Posted: 18 April 2013 at 12:12am
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Howdy everyone. As David is well aware, I absolutely
DETEST the "performance" four-speed that is currently bolted up to Gretchin's new heart (Seriously, it has zero redeeming qualities) which means behind brakes and an alignment, a new transmission is the next on my list of things to take car of. Now, anyone who has spent two minutes with me knows I like to jump straight in to the "obscene and over-the- top" end of the scale with things, which means I'm looking at doing an F40 Six-Speed swap. I had a few questions for the more technically minded of you:
axles... Yet it says I'll need to buy G6 axles as well. Why is that? The Transmission uses a digital output instead of a gear- drive, anyone know if there's a way of getting them to play nice? The flywheel from a G6 and a Fiero are 0.16" different in outside diameter, and have identical inside diameters. Does that mean a SPEC Alumnium flywheel could still be bolted up to it? The G6 transmission weighs 112ibs, does anyone happen to know the weight of the four-speed? I recognize there's a lot of questions there, but to anyone who answers, thanks in advance! ------------- Never shift into reverse without a back-up plan. |
Replies:
Posted By: D_sensitized
Date Posted: 18 April 2013 at 8:23am
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For the speedo, there's a simple circuit to wire up between the digital
vss and the Fiero speedo that will get it all to play nice. I had to do it for my trans swaps, costs about 3$ for components and takes 5 minutes to make. I can find a diagram when I get home but it's easily googled. And on gmtuners site. ------------- -Harrison 88GT 3800 SC1 F23 5-speed Chilliwack |
Posted By: Romeo
Date Posted: 19 April 2013 at 12:21am
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Okie dokie, well that helps alleviate one issue. =) ------------- Never shift into reverse without a back-up plan. |
Posted By: Medic
Date Posted: 19 April 2013 at 8:18am
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Check out the pennocks forums on my cars F40 swap. http://www.fiero.nl/forum/Forum3/HTML/000030.html It is quite involved. The calibration has been an issue for me, it works with a dakota digital but that causes interference which causes the speedo and tach to bounce causing the idle to bounce around at times. I suggest simply going with a GPS speedo and eliminate the issue all together.That's my next move. It is a known problem with Dakota calibrators and I got zero help from them when I tried to contact them, they did not even return my email requests for help. Hoefully pennocks will answer a few questions. ------------- 88 GT Northstar 6 Spd |
Posted By: Medic
Date Posted: 19 April 2013 at 8:32am
------------- 88 GT Northstar 6 Spd |
Posted By: D_sensitized
Date Posted: 19 April 2013 at 11:06am
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I forgot the f40s output a different signal then the f23 and 4t60s do. The
gmtuners circuit won't work then. And if your going through the effort of the f40 swap, why not replace the engine while your at it? ------------- -Harrison 88GT 3800 SC1 F23 5-speed Chilliwack |
Posted By: Romeo
Date Posted: 20 April 2013 at 1:49am
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I actually like the vulgar V6 in the Fiero, I've no desire to change it out
on Gretchin. Just the transmission I absolutely loathe. ------------- Never shift into reverse without a back-up plan. |
Posted By: Dr.Fiero
Date Posted: 20 April 2013 at 9:59am
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Just do an Isuzu swap. Great gearing, and it's a drop in (virtually). Way cheaper too. |
Posted By: Romeo
Date Posted: 20 April 2013 at 10:18am
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Nope. Not as ridiculous. F40. lol ------------- Never shift into reverse without a back-up plan. |
Posted By: Medic
Date Posted: 20 April 2013 at 11:55am
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I have to agree with the Dr.
Check the F40 gearing to make sure it is what you want. My first gear is pretty low but i have the power and revs to make it useable. The trannies are pricey and the swap a lot of work. Make sure you get a newer trans as the first couple years had a design flaw that caused the shifter fork to rattle at idle in neutral. I have this issue, it doesn't affect the trans, it is just an annoying noise. If you don't mind the issue you may be able to pick up an older one a little cheaper. ------------- 88 GT Northstar 6 Spd |
Posted By: bcampbell
Date Posted: 21 April 2013 at 4:22pm
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Any reason you don't want to just swap in an F23? It seems
like everyone who has one likes it; speaking from personal experience it shifts nicely although I'm still waiting on a couple parts to put it in my Fiero. ------------- '86 2m6 F23 5-speed, LSD, 3.5L LX9 '89 Firebird 3500T, T56 |