In doing some research on rally restrictors recently, I came across some interesting information on 60mm throttle bodies. While not directly the same as a normal restrictor is seems a single 60mm is a choke at 800whp normally. Definitely no harm in going larger, the last one I did jumped a bunch with its most recent retune.

JMS saw 60whp on an already 840whp car with their 906 pull (FP 3794).

Aaron

 

Hmmmmm, very interesting..

 

Has anyone notices a difference in throttle response? Snappier with bigger throttle?? Lazy?

 

They can be more prone to bog on tip in.

 

^ Oh?

What do you think is the cause of that John?

 

Big air door means it can loose velocity at angle change since percentage of change can be ALOT more air per degree of swing. It can and HAS to be tuned around but it happens to some extent.

 

Hmmmm, interesting... Thanks John

 

DIGGIN IT UP. Aaron, since you know my dilemma right now, and Im contemplating the magnus with a 70mm fullblown with 3" ic piping, doesnt that kind of not make sense? lol

70mm is 2.75", and if I want to do 3" ic piping when I do the 6766, wont that 70mm tb be a bottleneck? I should do the boomba75mm right? Since 75mm is 2.9in. Makes a little more sense than a 70mm. Or will it not be that big of a deal?

 

As long as your throttle body is as big or bigger than your compressor wheel, I wouldn't worry about it.

 

Presumably the inducer, ya? 6766 is 67mm inducer and 87mm exducer.