WICH B-SERIES TRANNY FOR BOOST?

[vancem3m3]

WICH B-SERIES TRANNY FOR BOOST? LS GSR OR TYPE R IM USEING THE LS FOR LONGER GEAR COULDNT REALLY TELL THE DIFF. IN GSR THAT I HAVE.

[TheProfiteer]

LS

[speedminded]

LS or GS-R or a GS-R with an LS 5th.

lol @ ITR.

[coreyctr1980]

ive always heard the ls tranny is good for boost since the gears are longer and allow you to hold/build boost.

[SPOOLIN]

no, longer gears are not the answer. get a GSR tranny. or TYPE r if you want less top end potential but greater accel.

[xbn83]

ive always heard the ls tranny is good for boost since the gears are longer and allow you to hold/build boost.

WRONG! If you don't have a clue, don't mislead others. If you stay on HT a lot, you should know who Jeff is. Here is what he had to say: http://forums.evans-tuning.com/viewtopic.php?t=1496

[speedminded]

Gear ratios are merely a way to trade torque for rpm. With a higher numerical gear ratio, you are putting more rpm at the wheel. With closer gear ratios, you are able to stay at a higher rpm in between shift points. Something like the LS transmissions are suited more towards the broad torque curve/low reving LS engine. It keeps you in the peak torque area in between shifts. The ITR/SI/GSR transmissions keep the rpm's built up in between shifts, to stay in the more peaky powerband.

Having said that, for the track the itr/si tranny is the best hands down. Most high whp turbo engines are operating between 5.5-9k, and having their shift points in between. In combination with a tall slick size (24.5"+), and the high shift point (8.5-9k), you are able to keep the engine operating within the optimum torque curve.

With the LS transmission, between shifts it would possibly drop you out of the optimal powerband and therefore make you slower. Gearing simply put allows you to stay in the powerband of your engine in between shifts.

The myth that you stay in gear longer with the LS transmission makes you faster is purely false. Think about that statement for a second. Acceleration is the measure of velocity over a unit time. Watching the rpms climb on the tach during a 3rd/4th gear pull, they would be climbing slower than with the si/itr tranny. Looking at the definition of acceleration as a measure of velocity over a unit time, the engine would be getting to the same velocity over a slower time lapse. This would yield slower acceleration, and simply put make you slower.

Having said that, the gsr transmission is probably the best balance of a street/strip transmission. The gearing is a little less aggressive as the itr/si transmissions, which will yield a little more traction. For all out acceleration si/itr tranny wins hands down. For a slower car, go with the LS transmission.

How on earth would a ITR transmission be used with a larger turbo & higher boost fwd. Smaller turbo and lower boost yes but with 300, 400, 500+hp wouldn't it be too much torque to ever have traction in any gear? The few i've been around spin 4th gear at 80mph, what good is that?!!

Personally I think over 230-250whp on a sub 2,500-2,700lb is completely pointless without slicks. Even with just 200whp you'll spin coming out of turns on street tires. Then in the rain, lolol...forget about it

[TheProfiteer]

no, longer gears are not the answer. get a GSR tranny. or TYPE r if you want less top end potential but greater accel.

its too bad 1st and 2nd gears on GSR and LS transmissiona are exactly the same.

[vubuilt]

its too bad 1st and 2nd gears on GSR and LS transmissiona are exactly the same.

please explain

[Nang]

please explain

http://www.ff-squad.com/tech/temp/Bgears.htm

[Batlground]

The accepted "best" tranny is the GSR.

LS is too long and ITR is too short.

of course different applications can be argued on a more specific basis

[Tech5]

go gsr tranny i had ls tranny boosted Ls motor, ran great ,then I installeda GSR tranny... overall gsr would be slight quicker an still have top end power!

[boosted b]

go with the gsr tranny