i was just wondering if any1 had heard or knows of any companies that make a aftermarket or better throttle body for our 2.8L V-6's, i doubt it, but just wondering is all, any help is appreciated, thanks

FDP performance from canada.

Expect to cough up about 3 bills for it.

I belive its 62mm??

There is absolutly NO NEED FOR A LARGER TB for these rides.
WHY?
Let me explain for playing with the 2.8mpfi/3.4 sfi set ups.
I had my latest 3.4 TB in my hand (the engine that wnet into the Blazer).
I measured the TBs & guess what
NO DIFFERENCE BETWEEN A 2.8 (on my Firebird) to teh 3.4 item.
NEXT ON MEASURING LIST
The "Holley" TB of a Fiero.
Holley was outsourced to build the TB for a very low production vehicle (the Fiero) for GM.
Guess what
NO DIFFERENCE BETWEEN A 2.8 F Body & a Fiero TB.
CONCLUSION!
MOVE MORE AIR INTO THE TB CURRENTLY YA GOT BY RAM AIR FRESH AIR DESIGNS you create/make for street usage.
A larger TB is NECESSARY for a engne with much more gulping air need LIKE A V-8!

$300 to spend?
ignition upgrades
rebuild your distributor
better flowing exhaust system
Larger TB not necessary.
Realize also the 3.4 SFI intake is exactly the same (design is different, TRUE!) as the 2.8/3.1 design in air volumn movement.
AND THE 3.4 MAKES MORE HP/TORQUE than the 2.8/3.1.
That's how versital & great is the original design. The MPFI design is a very adaptable intake set up. Designed well from the beginning.
Make better, get more fresh air to it!
Make better, burn spark more efficently
Make better, exit exhaust better.
Stick around, we'll help ya make the ride stronger!
PS give up on winning every street race. The 60* V-6 ain't the street hero ya think it is. This jewel of an engine is packaged in one classic/classy ride. Enjoy the ride with your Bodacious Babe passengers!

You just bolt on a larger trottle body onto a stock motorand you will most likely get alot of throttle hesitation because the opening is too large for the motor flow and it will create a high pressure zone and slow up airflow momentarally when you crack it wide open- the stock one is fine for good throttle response on a fairly stock motor.

I own an FDP 62mm throttle body ($225 US) and intend to use it with my full race headers, fully ported 3.4 heads, and and ported & matched intake- It will make a difference for me when I use it with the combo I'm building- I will not put it on my 2.8 motor.

That's a great way to apply the larger TB idea.
Give us a shout to let us know the benefits attained.
I'd be very interested.
Can ya do a before & after test-small vs large?
Also move more air flow in by fresh air set up?
Would love to hear a real world response.
I "hear" Fiero people do this, yet good/worth it results?
Fiero people lucky.
I JUST LOVE FIEROS
I can't wait to make my truck proper & smog legal so I can drive around in my Fiero seats I installed in the Blazer.
Damn rain today!
I know last year SoCal was so dry lack of rain.....

What would be really nice to have would be a better intake manifold design, then I think a larger throttle body might come in handy.

Well said- If I could make my own castings I would. We are forced to use what we have- at least we finally have headers for these engine. Maybe they will get more popular and better things will follow.

Ked, sorry I won't be testing the stock one on the new engine setup- Everything will be setup for the larger one including the ECM.
I have a Dual snorkel intake that is factory on this car and the airboxes are completely cutoff. It'll flow a V8 easy.

There is truly nothing wrong with this MPFI design set up
A little porting & ginding will solve most problems.
I just used the 2.8 set up as is on my Firebird and it does great.
WHAT TRULY HELPS is getting more fresh air into the set up, by a self designed home made ram air set up.

Hopefully a larger Tb on my 3.4l, with headers, and roller rockers will give it an improvment, not a loss.

Yes it will as long as you port the plenium to match the TB. (Careful-there is not alot of material there. I'm going to have mine welded thicker before I port it.) You will definately gain topend performance with headers and TB. It'll work great on your 3.4

I've always wondered how long the intake runners are. From plenum to intake valve. I've a funny feeling that they may be tuned to a lower RPM range like the V8 TPI setups. On a small short-stroke engine this can really hurt.

Also, do the runners continue up inside of the plenum? Might be interesting to see if the runners (lower plenum?) could be milled down and a new not-as-wide plenum be put on top. This would change the air induction characteristics quite a bit.

Any pic's of the individual pieces around?

RBob.

I know there is nothing wrong with the design, I am not really keen on the way it looks. I love the LS1, and TPI intakes. Those look really cool.

WHAT I'D LOVE TO DO
is cut of front TB nose of the Fiero TOP of the induction system, tig weld on the Firebird TB opening, to match the Fiero vlave covers.
Extrud Hone has suggested opening up the stock stuff for more flow of a 3.4
AT $$$, I'll put gas in one of my V-8 rides.

The 3.4l intake leaves NO space for improvment. Will have to cut front off and make new front for it.

What about duel mounted throttle bodies, one for each side of the intake manifold, like on the 300ZX engine.

Well, what I have seen done is adapt a LT1 body on the front. Had to cut off the front. Fuse on a "box" to hold and tunnel the air for the lt1

Will attempt picture attach.

Yes this is a turboed 3.4l

Heres stock......

Cool pics Dale. That turbo setup looks real simple.

you wouldnt say that if you seen the whole page )

It is intercooled.

I wouldn't know where that other pic came from

I read Super Street on a regular basis, after looking at about a handfull of 800 bhp Skylines, RX7s, Silvias, and Supras, that setup looks pretty darn simple compared to what some of those Tuner companies like HKS, and Blitz have done.


I don't see any advantage in getting a larger TB since our engines are so small that the difference would be very minimal, and you would not feel the difference.