A guy here is building ~800HP Audi Quattro and is asking around about different BIG HP cars technical solutions. He wonders how big throttle bodies are used on eally popwerfull fords - works RS200 or 700-800BHP Cossies? Anybody know what ind of diameter it schould be?

 

in first.. its down to the elbow on a cosworth which is the limiting factor.
So .. in first .. on a cosworth you would need to get a custom manifold which bins the elbow...
then .. you go for a bigger throttlebody...
on a cosworth .. 65 mm from a RS500 .. (standard is 56mm)..
this is enough to go to 600 ish...

i use one from an alfa V8 (76mm)...

hope this helps..

 

I know it's down to elbow, I wonder what is used on those really powerfull cars which don't have the elbow problem

What is the diameter od RS200?

 

I use a rs500 set up on mine it makes more than 600 , circa 650 @ 2.5 bar on race fuel. Then 150 Nitrous is crammed in with no probs.
Rod

 

Hello,

For 800bhp I would advise a 75mm throttle body with a forced induction engine. If you are using say a 650 engine + NOS as Rod does then you can get away with a smaller throttle as the base engine air flow is not effected by the NOS. In this case 65mm is adequate.

 

No it was rather real 800HP drag car without NOS. Thx for info Karl.

 

just to back up what karl said,,(not that he needs it at all)
ive read that 75mm will be fine