Single throttle body or keep ITB's?

[newalliance123]

I think the main advantage would be single TB is the way to go for a MAP setup. I don't see what difference it would make from single to twin turbo setups.

I do like the clean setup of a single TB, and I like the fact that there are less things to leak and go wrong.

[Super_Dude]

I never had a problem with itbs with my single turbo. I want to switch to to single throttle but it's not worth it right now. If you already have all the bells and whistles than sure but I think there are much better ways to spend the cash

[Skym]

I had a link to videoclip of RB26DE in R32 (limited edition 4door with RB26DE engine) vs R32 RB25DE (GTS style intake plenum with longer runners) and the response was alot better on RB26DE when they were comparing them. So it backs up that it was designed to increase response of engine.

From what I have been told by a tuner that's tuned high hp GTR's that were producing over 1000hp with big single turbo's, that stock ITB are good for around 1000hp. If engine is producing over 1000hp (alot of boost), they become a restriction (I assume diameter of throttle bodies, size of intake plenum). So I assume you have to workout how much air is entering engine, etc and is stock intake plenum big enough to supply enough air to cylinders. JUN have probably done all of these calculations, flow testing of head, flow testing of intake plenum when designing their intake plenum.

GTS intake plenums have throttle body > collector (just behind throttle body) > runners > ports on head.

Mines tend to enlarge stock GTR throttle bodies and fit redesigned, bigger throttle plates for better response. It's a well known mod on turbocharged engines.

My advice is, if you buy a custom intake plenum, ask for a flow test to prove that it works and that it provides enough air to each cylinder. Any head specialist with flow bench could do this for you.

[Black BNR32]

Nothing but problems with trying to make the single work with stock setups.

huh??