Dawg’s performance intake

Here's the completed big bore throttle body. 






It ends up it was a good thing I machined the bore very precisely.  The relationship between the bore and the throttle plate (butterfly valve) is critical.  A little off and you either bind or the plate jams in the closed position.  Got it dialed in now....:)


Here's a look at how much bigger the bore is now.  Quite a difference.




This thing should kick ass!

DG

lol...Ya Baby:)

Just a side note, these will a minor (not the major port job) just the opening up of the intake to match the tb size, will gain an average of 5-7hp, just find the old Darrell Morris website.

With the big bore TB done, I'm starting on the upper intake.

When you cut one of these open it's easy to see the restriction in the neck.  In my opinion, there's not much point installing a big bore TB without modifying the intake also.

I'm sure there is a benefit either way, but it's easy to see the massive potential of an opened up intake.

At the very least, the opening right behind the TB would need to be ported to match the new 56mm bore.







As you can see, lots of cutting and fitting before you can weld anything.  I'm not going to replace the EGR port.

DG

Oh I'm sure no one but a Fiero expert would notice the extra bulge under the neck.

It would be nice to find the original red color in a handy spray can.  Anyone ever try to find one?

Get me another TB and you can have this one.  Luke doesn't seem to be in a hurry so he can have the next one.

I should have this plenum done by Sunday.

DG

Capt Fiero wrote: I might have to reconsider your offer on the intake, if it appears stock when looking at the intake installed, I'll bet I could pass collectors status with it installed.

Dawg wrote: I still need to port the opening and figure out where to mount the small spigot.  I forget what it's for again.  Its stock position is pointing straight down and it's maybe 1/4" in diameter. Anyone know?

The vaccum port?  That went over to the PCV valve.

Today I delivered Dave's big bore intake.  We compared various intakes he had and then had a look at his 88 engine and decided that the PCV valve's spigot could be mounted just about where the stock one is.  There was nothing in the way after all.

I have no pics but I think Dave has some.  Maybe a pic of it installed soon?

DG

The intake does look amazing, but I was not the one taking the pics of it, Car-2-Lo was.  I would have installed it today, but I need to make an EGR block off of some sort.  Also I think you still have the bigger Throttle body or did Luke by that from you?

      To the untrained eye, Dawg's new intake looks stock and in even better than new condition due to the paint he used.    This is truly a work of art, (as are most parts from the Dawg)

   I'll try to get it installed in the next week.  I'll also have to find my aftermarket EGR delete chip and swap that in at the same time.

I agree that there isn't a lot of joy in putting larger TBs on Fieros.  When you suck and see on a flow bench and you do it as an assembly, the TB doesn't show much because the bottleneck is in that manifold neck.

Attacking that is the way to go and I rather like the approach you used.  Would love to see before flow measurements and then with just the neck mod, and then the TB enlarged as well. 

56 mm is probably all the 2.8 can use. I run a 62 mm on a 3.4 (not in the Fiero) but with a totally different plenum without the restrictions.