There is a company Called FDP Performance that make a 62mm throttle body for our MFPI. Stock is 52mm. They sell for $225 U.S..

The website is http://www3.sympatico.ca/fjpeters/throttlebodies.htm

click on products/ then click on throttle bodies/ then click on plenum porting instructions

 

Throttle Bodies
GM 2.8/3.1L 62mm Throttle Bodies
Price: $225 US or $340 Canadian plus shipping


These are 62mm throttle bodies designed for 2.8 and 3.1L MPFI equipped front and rear wheel drive GM cars.
They will fit most models from 1987-93, and some 1994 models.
Cavalier, Sunbird, Beretta, Grand Prix, Camaro and Firebird are some examples.
Before ordering, we need to know the model of car the TB will be used on, so we can install the correct linkages.
These will not fit the Fiero 2.8L engine.
To order, Click Here to send us an email with the following information:
-Car make, model, year, method of payment (Paypal, money order or check), and your shipping address




GM 3100/3400 SFI 62mm Throttle Bodies
Price: $230 US or $355 Can. plus shipping and $40 refundable core charge
These are our new 62mm throttle bodies designed for GM's 3100/3400 SFI engine line.
Some models are 1994 to present Beretta, Grand Prix, Grand Am and Alero.
We will need to know what car and year the TB will be used on, so we can install the correct linkages. Occasionally we may ask for pictures of your stock linkage so we can be sure we install the right one.
If you can send us your stock TB, we will install your stock linkages on the new TB, and ship it back to you.
Not only will this save you the core charge, but we will deduct 10% from the price of the TB.
To order, Click Here to send us an email with the following information:
-Car make, model, year, method of payment (Paypal, money order or check), and your shipping address



Bigger Throttle Bodies Coming Soon!!!
-GM 2.4L DOHC 62mm TB (Now in progress!!!)
-GM 5.7L TPI single butterfly TB (replaces stock twin butterfly TB)
-Fiero 2.8L 58mm TB (still pending interest)

If there's any car that you'd like to have a bigger throttle body for, let us know!
We're always looking for more products to provide to our customers.
Depending on the application, one-of-a-kind TBs may be available as well, for an additional cost.

 

Sweet.
If only I had money to burn. Thats a great modification or so it seems to look that way.

 

What would be the point?? If the bore is 62mm and the opening into the upper intake is 52mm you would only bottle neck the air. This wouldn't do much for you. I'm not even sure if the is enough room to open the upper intake to 62mm. Even at that would need to be able to do it all the way back to the main boddy of the intake. This would be verry difficult at best becuase it is a long and bent passage way.

Now If they made a custom intake manifold to all long with this throttle body, that would be F'N AWSOME!!!!!!!!

 

Read the article and it will explain to someone as ignorant as you how to port the opening. What exactly do you know about engines? Basic rule #1- the better an engine can "breathe" the more power it will produce! But I'm forgeting that you probably would rather waist you're money on a Quote "Ramair package" that does (not to break everyones heart) Nothing for a tiny V6 that hardly sucks any air. Once the air enters the plenium chamber, it is sucked six different ways. A slightly larger throttlebody will SHOW A NOTICABLE IMPROVEMENT even with the stock intake. You're stock air duct is also sufficant, just lower your cars running temp. Most aftermarket proms will do this. With headers on the other end would be the next benefit but us Cailf. guys can't do that legally. The V8's suck enough air to make a noticable difference to justify the ramair mod. Mainly stock V6's get enough cold air through stock system. For you guys with modified V6's I hope realize this is not directed towards you- it would help in your cases.

 

Are you trying to confuse me or you just plain confused?

First when did I say that I would rather "waste my money" on a ramair package. Yes at one point I did have the dual snorkle with sheat metal fabed ram scoops, but I found I got better performance by taking the sheat metal part off. It was blocking to much air flow to the radiator. Which in turn caused the engine to run hoter. All though it did wonders when the engine was cool.

Second you appear to be contradicting your self. You start off by saying that a ram air setup does nothing. By the way I assume that if your going to do a ram air setup you will also be using a high flow air filter other wise what would be the point. Then go on to say that a slightly larger throttle body will show a noticable improvment, becuase it is alowing more air in. Well if we're to go with your line of thinking both would show an improvment sence both allow more air in. Infact both would compliment each other.

Third don't assume that I am ignorant (infact you have shown your ignorence by jumping strait to name calling ) and don't know squat about engines/cars. I do not claim to know it all, but I know the difference between a cam shaft and an exhuast bering.

Now on to the throttle body / intake part...

I don't know if you have ever had your intake completly off yet or not, but if you look at the runner as it meets the middle portion of the intake. Those runners are tiny. If you were port the upper intake just behind the throttle body yes you would get more air into the main body of the upper intake. But once the air gets to the runners it gets bottled necked.

What I was refering to in my first post was that you would need to have custom work done on not only all 3 parts of the intake but also the heads would need to be ported on the intake side. Some of the work would be strait forward like the portion just behind the throtle body. But the runners on the upper, middle and lower intake would be a PITA. In fact I didn't see a way to get a grinding stone all the way down the runners at all. Now I have heard of extrude (SP?) honning, but it cost a crap load off money and I'm not sure how much it would open those runners up to. I belive it mostly polishes which would help. Once you have gone that far why not do the exhuast side as well to help get the air out.

The entire path needs to widened to see a real improvment. Not just to the main body off the upper intake. Of course this is just my opion and being that I am ignorant and such I would only be looking at opening up the first portion the air has to travle and not the entire path.

 

Sorry, I was not trying to offend you. The word ignorant simply means lacking knowledge of, and was not namecalling like stupid or something. It just implies that one is maybe misinformed or uninformed.

Just again standing by my post that $250 is better spent on a throttle body than a ramair. If you have money for both the more power to you, but for people who don't, this will give a noticable improvement by itself and is a good starting point. As one would build their project more over the years ,of course match porting the intake to heads would help greatly as well as headers. Injectors. Cam. Crank. Rods. etc. etc. However, all these things are costly for someone on a limited budget.
This product will give results for someone looking for a little more UMPH in a daily driver.

 

Spend the money on a better flowing exhaust starting by removing the restrictive manifold to CC pipes, the small I pipes & the original V-6 muffler.
$250 spent on the factory designed exhaust will gain you way better results, any time.