JDubya

I'm going to get a new tranny most likely but i'm not sure which i should get. I dont have turbo right now, but hopefully by this fall i will. The old saying how an LS tranny is better for boost isn't true right? What would be better for turbo, not crazy boost, just like 10 psi?

tony1

I'd go with a gsr tranny. The b16 will actually accelerate quicker, but with the low redline of the ls motor you'll be shifting into 5th on the track. DIRep ran a 12.8 on street tires with a stock ls motor and gsr tranny. Full interior street integra!

shermanyang

iTrader: (1)

I love my boosted ls with ls tranny. it's perfect for a daily driven turbo'd ls. but i also love my buddy's turbo'd ls with gsr tranny as well. just preference in my opinion.

JDubya

damn, he really ran a 12.8 w/a stock ls motor and a GSR tranny?

rondigs

I've been wondering.....How much difference does the gsr tranny make compaired to the ls. In other words, in REAL TIME how much quicker is the gsr tranny (given equal power output and traction).
I completely understand the shorter gearing accelerates faster, but how much faster?

95hbMatt

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ALL MOTOR LS &raquo;</TD></TR><TR><TD CLASS="quote">damn, he really ran a 12.8 w/a stock ls motor and a GSR tranny? </TD></TR></TABLE>


I think he meant boosting with stock LS motor....I doubt he ran a 12.8 with just a "stock" LS motor and GSR tranny

JDubya

O, ok. I was gonna say.....

tony1

Yeah, turbo, sorry. I thought everyone was turbo by now?

shermanyang

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rondigs &raquo;</TD></TR><TR><TD CLASS="quote">I've been wondering.....How much difference does the gsr tranny make compaired to the ls. In other words, in REAL TIME how much quicker is the gsr tranny (given equal power output and traction).
I completely understand the shorter gearing accelerates faster, but how much faster?</TD></TR></TABLE>

not much at all really. if you're using the gs-r tranny on an ls...like i've noticed on my buddy's setup, he reaches redline too quickly to actually be quick. we've raced before both of us dynoing at around the same hp and tq but him having a ball bearing turbo gives him some what of an advantage, and i've been able to take him time and time over again. now if you think it's the drive, we switched cars and he beat me in my car as well. could of been the rim/tire sizes...who knows??

yeah, i think it was the tires and rims. i remember the big tymers on here saying on a b16 tranny they run huge tire sizes to make up for the short gearings.

incognitoracerr

I agree

HybridKOOP

GS-R and LS transmissions have the same first and second gear... when you shift into third for the first time you're like "whoa" since the revs will be up a bit higher than the LS 3rd, 4th, and 5th gears...

I think the GS-R tranny is a very good choice for turbo, over the LS tranny, but I personally would still go B16/ITR... Honda's were made to rev, it's all about finding tire/suspension solutions to keep the power to the ground...

stupid fast 5.0

I am very interested in this discusion and have often wondered what the ideal tranny setup would be for a LS turbo. I am currently in the process of building a LS turbo for my 97 hatch and want it to be set up for optimum 1/4 times. Any more info on this maybe someone els could share their experiences?????

Thanks!
Nate

hawjdude

I'm in the same situation for my boosted gsr. What would you guys pick, people tell me ls and others tell me si tranny or get a new gsr tranny. They say si because it has shorter gearing and i would probably do better in the 1/4 with a si or itr than the ls or gsr. So what would you guys choose.

DIRep972

iTrader: (1)

an LS turbo motor has alot of area under the curve(torque) that you can take advantage of w/ proper gear spread. Shorter gears accelerate you faster, close ratio gears keep you higher in the rpm range. For an LS turbo w/ stock head LS tranny is not as bad as alot of people want to think it is, its the final drive that sucks. a 4.40 or properly tuned slick size would help out alot. But for most people the GSR tranny is a simple cost effective swap that will work nicely. on my car w/ a 23" tire and 110 trap speed the GSR tranny was sized perfect for the 1/4 mile. Shifting to 5th right as i go through the traps.

rondigs

So, how much quicker is the shorter geared tranny (in the 1/4)?

Tenths, seconds, etc.

Muckman

iTrader: (2)

Anyone have any negative experiences from gearing that was too short (ITR S80/SI) on a high power honda? - ie. too much wheel spin. In cases like these wouldnt taller gears (GSR Y80or LS) make more sense to put the power to the ground? Close gearing is great, just seems to me it is until you start spinning through every gear.

*Edit: assuming both trannys have a LSD too
You turbo guys without LSDs are nutz!

quikB18B

I had a gsr tranny in my last setup, I like the way it felt not too short not too long. In a few weeks ill be able to make a boosted comparison.

I think most people understand the concept of the pros and cons of each tranny, but people really want to see some #'s

Hey direp you dont have any slips to compare your tranny swap do you?

DIRep972

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quikB18B &raquo;</TD></TR><TR><TD CLASS="quote">

Hey direp you dont have any slips to compare your tranny swap do you?</TD></TR></TABLE>

kinda. I can tell u alot changed between my 13.0 and 12.8 runs.

on the 13.0 I wieghed 2750, was running 13.2 psi of boost, tuned on Vaportrails map, LS tranny, Revhard kit w/ garret 57 trim and it was about 40degrees that night @ the track. went 13.089 @ 109.99 w/ a mid 2.0 60'

on the 12.8 I wieghed 2615, was running 11.8 psi of boost, tuned on my street map(lost vaportrails map ), GSR tranny, Full-Race manifold w/ precision SC34(57trim) and it was about 90 degrees @ the track. went 12.89 @ 109.3 w/ a low 2.0 60'

I really can't vouch that the GSR tranny is what did the trick, but I will tell you from the butt-dyno that I would do it all over again. the boost was probably cancelled out w/ the wieght, and the manifold was prolly cancelled out w/ the temp's so that only leaves one thing left.

93LSivic

Definetly go with GSR. I also busted a 12.7@110. This was in my Si hatch weighing in at 2600 with me and 1/4 tank gas. On that run I hit a 2.002 60' with 205/50/15 Azenis (23" diameter). Open diff'd gsr trans with act xtss clutch. Maxrev manifold with 57 trim t3t4e at 11 psi through a JB welded starion intercooler. I guess track temps that night were probably low 70's.
I did have to shift into 5th before the traps, so im thinking some valve springs and I would have stayed in 4th and ran probably a 12.5 since I fell out of boost during the upshift into 5th.....mph would have probably stayed the same if not maybe 111, but doubtfully.

boostaholic

I also have a GSR tranny on my turbo LS motor. The car definitely gets up faster, but at the track it's important to run a tire size so you still finish in 4th. With a 205/45/15 radials, i'd hit 110mph at 7500rpm. But at the track on 22" slicks i was having to shift into 5th shifting at 7500rpm. I could have ran it to 8k but i'm still running the stock LS valvetrain. I ran a 12.9@104 letting off since i blew a charge pipe off. With a 23" tire and ~110mph trap it works out just right and you can ride through 4th. If you run the GSR tranny i suggest upgrading the valvetrain so you can rev the motor higher since the stock LS redline doesn't work with the shorter gears once you start maxing it out.

DIRep972

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93LSivic &raquo;</TD></TR><TR><TD CLASS="quote">mph would have probably stayed the same if not maybe 111, but doubtfully.</TD></TR></TABLE>

yeh upshifting to 5th hurts trap speed bad. Trap speed is measured by a speed trap that starts 66ft. from the finish line. Its hard to tell distances at the top of the track but I hit 7500 in 4th gear probably 100+ft before the finish and by the time I got into 5th i was right @ the speed trap. I left it in 4th and ran it to 7800 on one run and trap speed was still 109, I probably coulda coasted 100ft and got the same trap speed. Moral of the story is go w/ a bigger tire then we did if u wanna trap 110+ on the LS turbo/gsr tranny combo.

rondigs

Theirs alot of variables in those comparisons.
I thought a more noticable difference would be made. 2 tenths isn't very much. I just wish there was a way to do a equal comparison.
Im trying to justify ditching my current ls tranny and buying a new gsr tranny.

E Swift

My GSR tranny is great with my LS turbo setup.

96IntegraRS

Has anyone with an LS and a JRSC used a GSR tranny?

At 9psi, my car is making 193 HP, well under the 225+ that the turbo's are putting out, and I'm struggling to crack 13's (traction issues) but I figure that a shorter 3rd would improve my times....

length

keep the ls tranny much longer gears for turbo!!