Big bore throttle body

[RSCoupe]

Hey guys,

I am looking for a large bore throttle body to go on the Wagner intake manifold I have for my 2.3 turbo project. Is there a bolt on TB from VW (maybe from a VR6?), or from Porsche, that I could get bored out?
Or should I just find a used one from an AAN or 3B and have it bored out?

Thanks.

[Albert]

Did You find any big throttle body's ?

[Mark Halligan]

Did You find any big throttle body's ?

Albert, I read something on 20v Kruemmer (message # 1291) about a high power engine being fitted with a Porsche 928 S4 throttle body, don't know if it is bolt on though.

HTH

[NoNonsense]

Albert, I read something on 20v Kruemmer (message # 1291) about a high power engine being fitted with a Porsche 928 S4 throttle body, don't know if it is bolt on though.

HTH

what is the diameter of the venturi on the stock throttle bodies?

[S2sedan]

Has anyone tried to 5 throttle bodies just like BMW M3 ??? Does it works well for turbo cars ?

[Mihnea]

5 throttle bodies doesn't work well on turbos.

IMHO, you don't need a larger bore throttle body. Some people have done this by thinking the throttle body was a HUGE restriction in the 20vt engine, but if you look at Javad Shadzi for instance, he has achieved 455HP at the wheels on a stock 3B intake manifold with the stock throttle body, without actually feeling that there was a restriction there... and I do trust Javad's HP more than some other people's who are using larger bore throttle bodies (no, I won't say any names).

HTH,

Mihnea

[Albert]

Thank You guys for the info, I'm looking for a throttle body of 75mm ... the one form 3B has around 65mm ... in the process of getting my engine together for next year a TB wont be that of a big cost, but later it might save me some HP. I was told that 65mm will be good for around 650HP.

People with DSM and Supras are using bigger TB ... why not to use one if I will be making a custom IM ?

[NoNonsense]

5 throttle bodies doesn't work well on turbos.

IMHO, you don't need a larger bore throttle body. Some people have done this by thinking the throttle body was a HUGE restriction in the 20vt engine, but if you look at Javad Shadzi for instance, he has achieved 455HP at the wheels on a stock 3B intake manifold with the stock throttle body, without actually feeling that there was a restriction there... and I do trust Javad's HP more than some other people's who are using larger bore throttle bodies (no, I won't say any names).

HTH,

Mihnea

I agree...but if you are running a 3.5" exhaust, you would want your throttle body and intake plumbing to be similar to have a "free-flowing" system. I don't think a bored throttle body will hurt anything. Plus, it's added bragging rights!

[Albert]

Albert, I read something on 20v Kruemmer (message # 1291) about a high power engine being fitted with a Porsche 928 S4 throttle body, don't know if it is bolt on though.

HTH

Thank's Mark ... in the stage where I'm going ... there is nothing bolt on We will see if I ever get there so many problems on the way

[NoNonsense]

As bad as this sounds, i was planning to use one from a mustang. They are pretty cheap for bored out TBs...I was either going to cut the flange and weld it to my intake manifold or have an adapter machined to fit it.

[ottawa coupe]

there was discusion about this not too long ago on the local vw board. a friend of mine has a 16v g60 running megasquirt injection. the big mod is that he's put and s2 mani on and chopped a cyl off (kinda upsetting if you asked me considering how rare the cars are ) so that he can run a better IC setup.

the conclusion was don't go absurdly big (75mm for example) because the driveability goes down the crapper. city driving becomes very jerky. sorta like opening the floodgates of a dam when all you want is a glass of water, no matter how hard you try, you're gonna get too much.

you don't need to go crazy with the tb size. dunno what you s2 guys got, but i'm sure you can crank out serious power with the stock one....

if you absolutly must, mustang ones are a dime a dozen and come in a variety of sizes......

[NoNonsense]

I know having a mustang part on an Audi can be considered sacreligious, but it's what i am leaning to. They are available in 65mm, 70, 75, 80, etc...might be an easy solution.

[Albert]

and what about 4.2 liter engines ... what TB there whare used ?