Whaaatt !! not another intake mod (Page 3/4)
lou_dias DEC 14, 11:43 AM
In my original 187 rwhp Fiero intake, I shortened/shave the space between the upper and middle intakes which in effect opened up that transition area where they meet. In another intake I simply bored the inner side about 3/16" on both upper and middle.
You need to cut the gasket to match.
sleek fiero DEC 14, 11:54 AM
Lou;
Now you have me thinking. Thanks for the idea
Raydar DEC 14, 12:41 PM
Nice work!

I recently saw another mod that had the pipe from the TB flared out, fairly closely behind the throttle body. The "corner" that you radiused was almost completely removed on that version.
The opening from the neck into the plenum was a large oval - almost a rectangle. Took up probably 2/3 of that end of the plenum.
sleek fiero DEC 17, 11:34 PM
As I said I will show some more mods to increase airflow


I am going to get rid of the intake muffler and open up the filter base restriction


I will remove the screw rod mount and build a new one with a couple of square inches less restriction



by doing this mod the cross section is much less and next i will work on getting rid of the intake muffler
sleek fiero DEC 17, 11:46 PM
so I got a foot of 3" pipe and had it bent a few degrees. Then I cut ,fit and welded until I got the right shape. I used the old Muffler mount and welded it in place and installed back in the wheelwell





I already have a side scoop I built before so now when warm weather comes we will see if these mods were worthwhile. sleek
sleek fiero JAN 28, 07:00 PM
I finally installed the modified intake manifold and 60 mm Bosch Motorsport throttle body. It starts and runs well but I will wait until nice weather to take it out and do some datalogging. Everything fit well and looks good. One more project off my plate.

[This message has been edited by sleek fiero (edited 01-28-2024).]

Frenchrafe JAN 29, 01:59 AM
This is good work.
Before I went down the 3800 engine swap route, I did a similar mod to my original intake. Lots of aluminium welding!

(There were 2.8L GM V6's that could put out 300HP for racing purposes. I was going to try to copy some of the ideas at the time...
....But I went turbo and the easier route!)

Regards,
Rafe

[This message has been edited by Frenchrafe (edited 01-29-2024).]

jelly2m8 JAN 29, 04:03 AM

quote
Originally posted by Frenchrafe:

This is good work.
Before I went down the 3800 engine swap route, I did a similar mod to my original intake. Lots of aluminium welding!

(There were 2.8L GM V6's that could put out 300HP for racing purposes. I was going to try to copy some of the ideas at the time...
....But I went turbo and the easier route!)

Regards,
Rafe




I did that too, spent years and many dollar on 2.8's only to realize the gains are ever so minimal, insignificant....I did it all, cylinder boring, cams, intakes, headers, tuning and the gains were questionable....


300 hp out of a 2.8? i'm gonna call that now. Suuuure you can spray that thing too death, anything can make 300 hp once

[This message has been edited by jelly2m8 (edited 01-29-2024).]

Frenchrafe JAN 29, 06:10 AM

quote
Originally posted by jelly2m8:


300 hp out of a 2.8? i'm gonna call that now.





I'm talking about the all aluminium racing block that GM produced for competition purposes. The intake was like a high perf carb intake on a V8. It breathed well and could maintain quite high revs.
But like I said, it was for competition only, but you could buy a block in 1981 and build it up for your race car!
I used to have the docs and specs....
...there were good infos that could have been adapted to the iron block.

------------------
"Turbo Slug" - '87 Fiero GT. 3800 turbo. - The fastest Fiero in France! @turboslugfiero
https://youtu.be/hUzOAeyWLfM

82-T/A [At Work] JAN 29, 08:32 AM

quote
Originally posted by Frenchrafe:I'm talking about the all aluminium racing block that GM produced for competition purposes. The intake was like a high perf carb intake on a V8. It breathed well and could maintain quite high revs.
But like I said, it was for competition only, but you could buy a block in 1981 and build it up for your race car!
I used to have the docs and specs....
...there were good infos that could have been adapted to the iron block.




Yes! I remember that engine! It was a GM crate motor that you could buy. It was actually an all aluminum 3.4 short block, and it was pre-drilled for both start locations.

Here it is... the Bow Tie Aluminum Block (second page): https://www.lunghd.com/Down...d_Links/V6_Parts.pdf


GM Performance Parts offered a high performance crate version of this which had a wild cam, an aftermarket intake, and was carbureted. It was meant for circle track racing.


But here's another thing... and I kick myself repeatedly for not having bought them when I saw them. GM ALSO made a VERY short run of aftermarket "GEN-1" High Performance all aluminum cyl heads. YES. Every time I mention it, people correct me and say that they were for the newer Gen-2 V6/60, and I correct them. GM literally made a short run of 50 sets of aluminum Gen-1 cyl heads... essentially the same specifications as the ones that were on the Pontiac Fiero (considered the HO version of the gen-1 cast iron heads). I saw a set, un-machined (hadn't had valves installed yet or studs installed) on eBay, and they sold for $250 bucks. This was back in the mid 2000s. At the time, I could have afforded it, but I decided against it because I didn't want to spend the money. I kick myself now... but whatever. I'll survive.

I don't really know what difference it would make. But you'd have a combined ~65 less pounds in the rear of the Fiero with an all aluminum Gen-1 V6/60. Which... as I type that out now... it doesn't seem so significant, haha...