ok so i know...use the search button. Any quick info would be great tho! So i have a friend that has a B20 turbo and is running a LS tranny. my question is what would be the best transmision to run? B16 and gsr are a better bet i know. but why is the LS not best or is it? still a n00b just trying to learn! thanks guys.

 

to sum it up quickly and effectively, the LS tranny gears are perfectly suited for the low revving LS's torque band, when you put this tranny on a high revving motor, when you shift, the rpm drop is much lower than a B16 or GSR tranny making you fall out of power when you shift, it WILL make the car slower.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 96 GSR-T &raquo;</TD></TR><TR><TD CLASS="quote">to sum it up quickly and effectively, the LS tranny gears are perfectly suited for the low revving LS's torque band, when you put this tranny on a high revving motor, when you shift, the rpm drop is much lower than a B16 or GSR tranny making you fall out of power when you shift, it WILL make the car slower. </TD></TR></TABLE>

Not if you rev high enought

For me on High HP street cars the LS tranny ist the best you can use on the street, For drag only i would stick with ITR oder B16, if you running both than GSR ist the best mix of both.

 

from jeff evans:

"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."

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike93eh2 &raquo;</TD></TR><TR><TD CLASS="quote">from jeff evans:

"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."</TD></TR></TABLE>

yea that qoute is bogus

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike93eh2 &raquo;</TD></TR><TR><TD CLASS="quote">from jeff evans:

"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.
"</TD></TR></TABLE>

the slower your tach would climb but the more distance would be traveled

If it keeps you out of 5th gear in the 1/4 its a good tranny to use!

 

^
not another ls tranny vs gsr and b16 thread..there was just one last week...people always argue and flame when i say exactly this stuff...good to know i can reference this from jeff evans.

i'd like to add that the more torque the motor produces, the more effective longer gears will be.

 

Longer gears will help you with traction.

 

if you have traction problems, get better tires, stiffer motor mounts, and traction bars. only after all that, if you are still having traction, then it is worth it to downgrade to an LS tranny.

 

this whole topic needs to be stickied along with Ebay turbo kits, I speak because I PERSONALLY run an LS on my GSR only because I do not have the money to buy a GSR tranny and a new diff gear to fit my LS/B16 Quaife into the GSR tranny. My car absolutely sucks with the LS tranny, even shifting 9k+, the car bogs 1-2 and 2-3 shift and isnt that much better in the 3-4 shift. Bottom line if you want your car to be slower, run the LS, if you want to maximize your investment into your car, run an B16 or GSR.

 

I agree. A transmission sticky thread. The LS transmission is a dog. Run a couple different transmissions on the same or similar setups and you will find out why

 

I have personaly testest GSR VS LS both stock diffs, and the results are exactly the same 11.00 on street tires and 10.7 on slicks

I run the Same Exact ET's and gain a mph with the GSR tranny

Joe Simpson can vouch for this also
"The car Feels faster with the GSR but I run the exact same ets"

 

your comparing a race car to a street car, I am sure Joe is revving to 10k or so, and has a nice flat torque curve on his divided T4 setup..... most turbo honda street car graphs I see are peaky, with torque falling off up top, 1 way to help counter that is with a close ratio tranny. Now combine a LS tranny with a 24"+ tire and a high rev limit, you will be running down the back half of the track in 3rd gear in any car under 400whp, doesnt sound too good to me. Run whatever you people want to run, but stop asking the same questions that have been replied to hundreds of times in other threads.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fmfkid250 &raquo;</TD></TR><TR><TD CLASS="quote">I have personaly testest GSR VS LS both stock diffs, and the results are exactly the same 11.00 on street tires and 10.7 on slicks

I run the Same Exact ET's and gain a mph with the GSR tranny

Joe Simpson can vouch for this also
"The car Feels faster with the GSR but I run the exact same ets"</TD></TR></TABLE>

How many passes each transmission? Were the conditions the same? Have ran many different transmissions on our cars and customer's cars. One that sticks out in my head. Blown90Hatch's car. He went from consistant 10.6's with a used ITR transmission to 11.2's - 10.9's with a rebuilt LS transmission

 

I would say over 50 passes each last season and conditions on both where the same

and 11.01 with the LS and 11.07 with the GSR i would say its close

regaurdlessof this thread i highly doubt that the b20 in this thread revs past 7000rpm and do to that fact alone an LS tranny would be the only one where he did not have to shift to 5th in the 1320'