Anyone have any timeslips with LS-trannies on your cars versus say... a GS-R or B16 tranny. Hell.. even ITR. I just need proof that they work better for most applications. I'd even like to see times of an LS with 4.4 final drive even. Let me know power, slick/tire size, tranny.

SIDENOTE: I can't get my brother to get away from his shop's philosphy of longer gears let you use more of the power band. Well... I guess it kind of does at the expense of accelerating slower. He just doesn't comprehend the simple logic of physics dealing with acceleration.

Thanks, guys.

Just throwing this in for him to read.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boosted hyrbid &raquo;</TD></TR><TR><TD CLASS="quote">
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>

 

Before this weekend I was running identical times with my gsr vs ls tranny. I was running consistent 12.3's with both trannies.

This weekend I ran a little faster and I am running the ls tranny.

 

it has more to do with his power, rev limit and tire size. if the car is going to run a smaller tire then he might be better off with ls tranny, but if he ever decides to run a 26 " tall slick he will be way overgeared. majority of the faster cars are all running the shortest tranny possible that will still allow them to get the mph they desire at the end of the track without having to shift to 5th




Modified by R@mon at 3:56 PM 10/14/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by underpressure02 &raquo;</TD></TR><TR><TD CLASS="quote">Before this weekend I was running identical times with my gsr vs ls tranny. I was running consistent 12.3's with both trannies.

This weekend I ran a little faster and I am running the ls tranny. </TD></TR></TABLE>

Cool... obviously goes against me... but that's what I'm looking for.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by R@mon &raquo;</TD></TR><TR><TD CLASS="quote">it has more to do with his power, rev limit and tire size. if the car is going to run a smaller tire then he might be better off with ls tranny, but if he ever decides to run a 26 " tall slick he will be way overgeared. majority of the faster cars are all running the shortest tranny possible that will still allow them to get the mph they desire at the end of the track without having the shift to 5th</TD></TR></TABLE>

I know that. That's why I wanted to know slick size and power along with tranny. And even rpm.

 

I've had both trannies(LS and GSR) and I felt that the LS trans was better overall. I went quicker w/ less power on 22's with the LS trans than I did w/ more power and 24.5's on the GSR tranny. I love short tires so, the LS trans is for me. I will be using another one in my next setup. Just my $.02

Phil

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by D-Rob &raquo;</TD></TR><TR><TD CLASS="quote">


I know that. That's why I wanted to know slick size and power along with tranny. And even rpm.</TD></TR></TABLE>

Forgot to add that. this was on 24.5x8x13 slicks, and power is around 280

 

went consistant 12.90 13.0 on ls tranny went 12.50 12.60 w/b16 lsd on 22x8x13 slicks on a bone stock ls motor w/ 160k

 

10.0 at 141 on ls tranny

10.1 at 143 on gsr tranny....but with 40-60 less horsepower.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HondaBullSQ &raquo;</TD></TR><TR><TD CLASS="quote">Anyone have any timeslips with LS-trannies on your cars versus say... a GS-R or B16 tranny. Hell.. even ITR. I just need proof that they work better for most applications. I'd even like to see times of an LS with 4.4 final drive even. Let me know power, slick/tire size, tranny.

SIDENOTE: I can't get my brother to get away from his shop's philosphy of longer gears let you use more of the power band. Well... I guess it kind of does at the expense of accelerating slower. He just doesn't comprehend the simple logic of physics dealing with acceleration.

Thanks, guys.

We just hit 9.94 at 145mph....LS tranny......with honda LSD.

All Squeeze Racing.

Just throwing this in for him to read.



</TD></TR></TABLE>

 

Any mo? For or against my point? Just remember... power, slick size and all that.

 

doesnt really have to do with trannies but tire size. i have an ls with gsr tranny, was having to hit 5th on 22in slicks in quarter (12.82 @ 108.xx)
i bought some bfg drag radials ( 215/60/14) about 23.5 - 24 in tall. now 12.80 @ 109.xx staying in 4th at 7400 rpm
hth

 

on 28 X 10.5's we cross'd the traps in 3rd gear, stock ls trans/final drive.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dturbocivic &raquo;</TD></TR><TR><TD CLASS="quote">on 28 X 10.5's we cross'd the traps in 3rd gear, stock ls trans/final drive.</TD></TR></TABLE>

&gt; 135mph trap?

 

shifting 5th sucks ***!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by R@mon &raquo;</TD></TR><TR><TD CLASS="quote">it has more to do with his power, rev limit and tire size. if the car is going to run a smaller tire then he might be better off with ls tranny, but if he ever decides to run a 26 " tall slick he will be way overgeared. majority of the faster cars are all running the shortest tranny possible that will still allow them to get the mph they desire at the end of the track without having the shift to 5th</TD></TR></TABLE>


I ran a 26" slick with the LS tranny. i finished the 1/4 mile at the top of 3rd @9000rpm. best time was 11.5@125 with a 2.060ft.

 

YOU clearly do not understand the basic physics involved.

The ITR/GSR/B16 gears are not only shorter, but CLOSER.

The LS loses out because the gears are not CLOSE, not because they are long.

The quote you posted loses all credibility when it defines acceleration based on engine velocity.

Acceleration is a function of POWER; If I have two cars which produce exactally 200whp from 4000 until 8000. No matter what gearbox I use, no matter what ratios (as long as I drop back after 4000), assuming that gear change speed is negligible, the times will be EXACTALLY THE SAME (pedantics aside please).

A GSR tranny with a lower final drive would be sensational on an turbo LS in my opinion.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by string &raquo;</TD></TR><TR><TD CLASS="quote">A GSR tranny with a lower final drive would be sensational on an turbo LS in my opinion.</TD></TR></TABLE>

I have to agree with that statement. I have to use the ls tranny just because of trap speed. I dont have the rpm to carry it through the traps with a GSR tranny and the radials grow but not as much as slicks.

 

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

&gt; 135mph trap?</TD></TR></TABLE>

148 mph in 3rd.

 

I run a b16a in my PW/S car at the finish line im trappin (on 225 50 15) 124 at 8800 or so, im going to lean on it much harder this year, in the 9500 range should give me the finish line MPH i need to KEEP UP with Jim Huck
d

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by string &raquo;</TD></TR><TR><TD CLASS="quote">YOU clearly do not understand the basic physics involved.

The ITR/GSR/B16 gears are not only shorter, but CLOSER.

The LS loses out because the gears are not CLOSE, not because they are long.

The quote you posted loses all credibility when it defines acceleration based on engine velocity.

Acceleration is a function of POWER; If I have two cars which produce exactally 200whp from 4000 until 8000. No matter what gearbox I use, no matter what ratios (as long as I drop back after 4000), assuming that gear change speed is negligible, the times will be EXACTALLY THE SAME (pedantics aside please).

A GSR tranny with a lower final drive would be sensational on an turbo LS in my opinion.</TD></TR></TABLE>

I know. The 4.2 final drive vs. 4.4.

 

11.8 @ 122 with 380 whp and 1.7 60'
23x8.5 slicks and LS tranny, shift at 9k

btw: WTB, b16 3rd and 4th gear set and oem LSD for LS tranny or 4.4 final with LSD

 

Bump... thanks for all the posts... however... I need comparisons. If you don't have the LS tranny vs. another tranny, then please don't post.

 

you can try all of your comparisons on this?????

http://autocrossing.com/cgi-bin/gearcalc.cgi