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Did you come up with a solution? The 928 75mm TB on my intake has the same linkage - pedal travel as the stock TB. I can send you a picture of the linkage. Part throttle to WOT is seamless and works as stock. Recall the springs you sent me? We used those for a while, but changed them out with different springs on the TB, return, etc.
Originally Posted by Tom M'Guinn
What are the best bigger throttle body options out there these days? I've used the 928S unit, but have never been happy with the linkage, which creates short pedal travel. Boring the 951 unit doesn't get you very far...
So...who has a good (good and big) throttle body option?
For anyone that wants something a bit more but doesn't want to go extreme (us 2.5l guys), I just got a throttle body back from maxbore.com and it is beautiful. Bored out to 59mm. I sent him an Arnworx rebuild kit too and for a bit more he fully rebuilt it. I'll post a pic when I get home tonight. Going to try to get it in this weekend - last time I checked the TB was the only place I was leaking a little smoke when I did a smoke test @15psi.
Did you come up with a solution? The 928 75mm TB on my intake has the same linkage - pedal travel as the stock TB. I can send you a picture of the linkage. Part throttle to WOT is seamless and works as stock. Recall the springs you sent me? We used those for a while, but changed them out with different springs on the TB, return, etc.
I have been running the stock TB lately, but would be great to see your linkage...
For anyone that wants something a bit more but doesn't want to go extreme (us 2.5l guys), I just got a throttle body back from maxbore.com and it is beautiful. Bored out to 59mm. I sent him an Arnworx rebuild kit too and for a bit more he fully rebuilt it. I'll post a pic when I get home tonight. Going to try to get it in this weekend - last time I checked the TB was the only place I was leaking a little smoke when I did a smoke test @15psi.
I had him do my NA throttle body too, it was beautiful work, but it didn't make any difference on the na engine. But $100 for shiny parts!
I love how these are held together by two aluminum L profiles, makes spacing them to custom application super easy. Unlike some that are siamesed and strange shaped.
Ive looked at those too, do you know if they have any way of controlling idle air?
Also, have you ever tunned ITB turbo engine with MAP metering? Some say it is extremely difficult, others it will work just fine if I make a small vac tank hooked to every runner and use it just for map sensor.
I have a race car with ITB's and turbo. Speed density works with ITB's but it is suboptimal. Vacuum manifold is needed anyway because you cannot measure boost reliably from single port, it will fluctuate like crazy.
Ideal control strategy is Alhpa-N+boost compensation and even better is "hybrid load" where MAP and TPS are "mixed" together for x axis in VE table.
GSXR/Hayabusa ITB's have usually two vacuum nipples per throttle, one could be used to connect to vacuum manifold, seconds for idle air valve for example but these may be too small. Since most likely stock fuel rail and injector location is used, you can tap the throttle injector opening for idle air/brake vacuum.
07-10-2015, 04:19 PM
I'll post a pic when I get home tonight. Going to try to get it in this weekend - last time I checked the TB was the only place I was leaking a little smoke when I did a smoke test @15psi.
(package got to our customs, they sent it back to usa and now it came back again)
