JohnBradley

iTrader: (30)

Its from 2003 so I am sure its less now

honda-guy

iTrader: (55)

i had ITBs on my typeR swapped civic. ITBs are very hard to tune for MAP base ems because the transition between vac and boost is very narrow. the benefit of ITBs is better throttle response. the skyline GT-R has ITBs from the factory, so there must be some benefits to it on a turbo car.

JDMevoBOOST

iTrader: (37)

The reason it isn't done more regularly is because it overcomplicates the engine. Think about it logically. You'd have 4 throttle bodies each with their own butterfly. The throttle cable would need to have a brace that spreads across all four. Then you'd have to develop a new manifold. Just so many more parts that could break, get stuck, would need maintenance. I mean for a street application its just not practical.

I have an ITR and have considered it on my car as well, but it would be easy to service them to just take the horn off and get to the butterfly, but imagine taking off the charge pipe, then the manifold, then take out each TB just to get to one butterfly. Overly complicated. Just stick with what works. People are making insane power already without them, so don't go and look for a way to make your life more complicated.

jasburbak

I was planning on getting them for my s2000 not my Evo =) But wanted to know the logic behind why it has not been done, thanks for the explanations.

I just remembered what Company did FI for the M3's and it was Active Autowerk, i had thought of turbos but they apparently do supercharging with the E46 M3's, now supercharging requires low compression as well, but that has been done with ease (as in coming from a kit) on the E46's...

i'm not referring this idea to the Evo, just as in general so i could understand the logic behind it..

DevilsEvo666

ITB's generally cost more to produce on a car...and its only beneficial for more higher rpms, as why it works great on a S2000 and a M3, those motors rev really high...but ITB's are more for throttle response and high rpm power....The evo wouldnt be much of a difference since its boosted...

Evo IX MR

That S2000 is raw as hell.

-=SPECTRE=-

iTrader: (4)

There are a lot of supercharged E46 M3s that make 400rwhp but most of them are slower than stage 1 Evos. Not very impressive for the money spent.

riceball777

iTrader: (33)

there a guy on honda-tech what has itb's on his turbo integra. he built a sheet metal manifold around the itb's. i think his sn was tony the tiger

Rutt

iTrader: (1)

Not only did the GT-R have ITB's but the SR20DET GTiR also had ITB's. The close proximity of the throttle plates to the had gives unmatched throttle response. Because of this excellent throttle response the ITB's are preferred over a single TB on street/circuit setups. The short runners on ITB's are also excellent for high rpm performance but high horsepower (1200whp+) drag racers sometimes change to 90mm or larger normal TB's because the ITB's throttle plates become a restriction in performance on certain setups.

The addidition of a surge tank (plenum) helps with directing air to the ITB's while keeping hot underhood air to a minimum.

AWD Nissan Pulsar RNN14 GTiR SR20DET(t=turbo) intake manifold




RB26DETT





4AG powered Toyota AE101 and AE111 also come with the ITB's from the factory.

honda-guy

iTrader: (55)

^ that's a lot of ITBs, nice pics.

jordo

iTrader: (1)

You can build a pendium for ITBS, and use it for a turbocharged application.

Very easily, it helps when your trying to tune each cyclinder.