Intake Manifold (forward Facing Plenum)

[Yts]

so i am looking at a forward facing plenum for my r32, have an stroked rb20 and next on the list of upgrades now that i have finished the engine is a plenum, basically the power side of things has already been sorted out and mopre than anything doing it to get rid of the cross over pipes and tidy up the engine bay, basically what i want to know is bigger throttle body size i.e 90mm better then say a 75mm, there are options ranging from the 75mm through to 90mm for me to choose from, anyone with experience using this throttle body size or info to help me would be much appreciated

regards

jeremy

[T04GTR]

there is NO GAIN from going bigger than the piping. so a 75mm tb is perfect. xt6t across from my work made 538kw @ wheels with a 75mm tb.

so your 2 litre something will do fine.

[STATUS]

yup ^^^ we just pulled mid 400's on a sr20, std inlet and TB. Std will be fine

[Yts]

cheers guys thanks for clearing that up for me

[R31Nismoid]

Plus the other issue is the larger you go, the less responsive/controllable the throttle is with low RPM and so on given you use 10% with a smaller one it's opening a lot more than 10% with a large butterfly

A few people here have actually changed back from larger TB's to factory ones and noticed this down in their posts.

I think Al was one such user.

[Yts]

Plus the other issue is the larger you go, the less responsive/controllable the throttle is with low RPM and so on given you use 10% with a smaller one it's opening a lot more than 10% with a large butterfly

A few people here have actually changed back from larger TB's to factory ones and noticed this down in their posts.

I think Al was one such user.

yeh thanks for the extra info def good food for thought, so maybe just buy the plenum and use the factory tb?

[juggernaut1]

I actually found a larger t/b made the car "feel" more responsive on my sr20 with the 77mm Hypertune t/b over stock.

But yes because it is more responsive it can be trickier in car parks etc where you use low throttle apps. All in all I liked it.

Edited July 16, 2010 by juggernaut1

[bubba]

Have seen a stock RB20 throttlebody make 365rwkw..