ITB's on a 16V engine?
06-06-2012, 03:44 PM
#16
Drifting
I've been looking into this a bit more. 2002 GSXR 1000 throttle bodies are 42mm and come with 230cc/min (22lb/hr) injectors. They sell for about $150/set on Ebay.
06-06-2012, 03:47 PM
#17
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06-07-2012, 04:20 AM
#18
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Have been looking for various intake configurations in past. There are some variables which influences the size of itb as well as the distance from intake valve etc.
http://www.team-integra.net/forum/bl...imensions.html
The 42mm diameter itb should be able to give up to 450ehp. Also, too large diameter will kill the throttle response, which is one of the advantages of ITB setup.
The advantages of ITB setup is to have equal cylinder filling and less flow restrictions than standard intake setup. Those are also the reasons for good throttle response, I think
The disadvantage is to loose the intake pulse tuning effect, which actuall is much less than you may get from properly tuned exhaust side...
Since I'm interested of street applications, I have been looking for WRC style dual plenum intake configuration.
http://honda-tech.com/showthread.php?t=3016531
It should give more_less the same advantages than ITB, but with less overall cost. However, the price of GSXR1000 itb setup isn't bad anymore....
Local shop is selling DIY kit, which would be low enough under the hood and the tapered tube section can be attached to almost any position, allowing more installation variations.
The input of tapered section is 76mm, which is enough for one side of V. The size of plenum isn't big, but that's the situation with original S4 plenum as well.
Also, the larger TB will compensate the little plenum size in high rpms. Some calculations and estimations needed to verify the fitment for hp, torque, rpm etc. needs..
http://amwdynoservice.com/page25.php...ge&category=14
The WRC plenum is perhaps originally designed for turbo applications, but should work with NA engines as well..
Just dreaming of these things, but that doesn't cost anything
http://www.team-integra.net/forum/bl...imensions.html
The 42mm diameter itb should be able to give up to 450ehp. Also, too large diameter will kill the throttle response, which is one of the advantages of ITB setup.
The advantages of ITB setup is to have equal cylinder filling and less flow restrictions than standard intake setup. Those are also the reasons for good throttle response, I think
The disadvantage is to loose the intake pulse tuning effect, which actuall is much less than you may get from properly tuned exhaust side...
Since I'm interested of street applications, I have been looking for WRC style dual plenum intake configuration.
http://honda-tech.com/showthread.php?t=3016531
It should give more_less the same advantages than ITB, but with less overall cost. However, the price of GSXR1000 itb setup isn't bad anymore....
Local shop is selling DIY kit, which would be low enough under the hood and the tapered tube section can be attached to almost any position, allowing more installation variations.
The input of tapered section is 76mm, which is enough for one side of V. The size of plenum isn't big, but that's the situation with original S4 plenum as well.
Also, the larger TB will compensate the little plenum size in high rpms. Some calculations and estimations needed to verify the fitment for hp, torque, rpm etc. needs..
http://amwdynoservice.com/page25.php...ge&category=14
The WRC plenum is perhaps originally designed for turbo applications, but should work with NA engines as well..
Just dreaming of these things, but that doesn't cost anything
06-07-2012, 10:26 AM
#19
Drifting
I bought a set of 01/02 GSXR 1000 throttles last night for $100 with the airbox and trumpets. Hopefully I have some luck with this over the summer/fall. This is my first attempt at a car project post baby so the going may be slow.
06-07-2012, 11:43 AM
#21
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While I don't think I'll ever have the $$$ to do a set on my 928, I also will never be able to thanks to CA smog laws. However, I may be able to provide a little input here. You really need to be aware that getting vacuum to power the brake booster and other various components as part of the original 928's systems are crucial. This also includes setting up the ISV so that it distributes air through each throttle body.
One of the things I really liked about the GSXR ITBs in 2001-2002 is that each throttle body is short enough to use the injector as an intake tube for distributing air from an ITB. On my 944, I had a design where a hose would branch off into 4 lines directed to the injector holes of the ITB. While chopping the intake at the base is the best idea to mate up both the factory injectors to the base of the manifold and the ITBs together, you will need to make sure you get equal amount of air from the idle control valves to it, if you choose to use AC in your car still as well even, yes, LH.
I perfected the 944 ITB mechanical setup for factory L-Jet, still have parts, but never really put it together since I sold the car. Wasted project
One of the things I really liked about the GSXR ITBs in 2001-2002 is that each throttle body is short enough to use the injector as an intake tube for distributing air from an ITB. On my 944, I had a design where a hose would branch off into 4 lines directed to the injector holes of the ITB. While chopping the intake at the base is the best idea to mate up both the factory injectors to the base of the manifold and the ITBs together, you will need to make sure you get equal amount of air from the idle control valves to it, if you choose to use AC in your car still as well even, yes, LH.
I perfected the 944 ITB mechanical setup for factory L-Jet, still have parts, but never really put it together since I sold the car. Wasted project
