So far I am on my 5th tranny, and I started half season, its a long story. Its not that I care so much about the consumption of parts, its that I'm building more trannys and am confused which parts to install inside. I half to have a tranny built for the weekend, last race of the season.

When I started the season I was using GSR trannys.. It was just simply not enough gear, I'm eating it off the limiter crossing the 1/4. My limiter was set to 9200rpms at the time. According to every gear calculator this is wrong, but I went though a huge stack of GSR trannys, and they all did exactly the same thing, relined at the exact same place.

Then I started running LS trannys, the drop between rpms was a little worse but I immediately started trapping higher [131 to 138] and a bit of a lower et [11.2 to 11.0], no change in anything else. This ls tranny is supposed to do 17xmph in 4th, according to the calculators, but no way, I top out 4th pretty often and my car has never seen 170 nothing according to my speedo and logs.

Setup is simple junk, all stock tranny's, 24.5" mt's, to much power. RS dc Integra with gsr cluster, w p72 ecu

Could this be a problem with the tracks beams or maybe eCtune?

I'm no tranny genious by any means, but I can half *** move gears from this one to this one, change diffs, measure clearances, most anything needed to keep this pile going.

That being said; can I put a LS final drive in a GSR tranny? Or maybe ls 4th into the gsr?

I could be wrong, but the GSR trannys seem to be stronger, seems like they take no lift to shift a bit better. I also have quite a few more GSR transmissions than I do LS.

Thanks for taking the time, any suggestions, comments, or questions are more than welcome. I really need to figure this out before I possibly waste thousands building the wrong one.

DK

 

how much power is the car making ?

IMO, you should play around with a gear speed calc. to see where you fall with each combo.

www.autocrossing.com has one i prefer to use.

as for your parts swaping information, you can use the ls final drive in the gsr trans. you will need to swap out the pinion shaft, ring gear, and differential.

you can also put the ls 4th in the gsr trans, just be sure to use all the matching parts.

 

if you go LS 4th into a GSR you will basically have an LS transmission with a GSR final drive. This is so because in order to run the LS 4th you will also have to run the LS 3rd. The GSR and LS already share the same 1st and 2nd gears.

If your car has a fat enough powerband, maybe a regular LS transmission is good. If you are falling out of boost between gears, then perhaps a GSR with an LS final drive would work. I think you can also find some 4.0 aftermarket final drives too.

 

Have you considered raising your rev limiter? Most of us with drag cars and GSR transmissions rev a bit higher than that.. What about taller tires?

 

i had a stock gsr tranny last year was trapping 140 with no issue at all with 24.5 tires and a 9500 redline

 

def raise the rev limiter if u can that way u can get more mph per gear

 

correct me if im wrong but in a hydro b series ls and gsr have the same exact fourth gear ratio???

second off, what size tires are you running, not sure if i missed this
but 24.5 and ls/gsr 4th gear i trap 144 already and not out of rev range. im thinking i should be able to trap 150 on this setup with 10k rpms

and i runa b16a trans 4.40 gear with ls 4th gear

thanks
dan

 

the GSR and LS only share the same 1-2 gear ratios. They have different FD's and 3-5 ratios

 

Raise your limiter and use the GSR trans.

LS FD will work in the GSR, with either a LS or B16A diff.

Strength wise, all B trannys are pretty much the same. The main difference being how much they've already been beat on in the past.

 

Ok cool, I have been using mfactorys, but its just not adding up! I'll check out your link asap.

I'm not really sure how much the car is making, it hasn't seen a dyno yet. Its a simple borg s366 sleeved 81/89mm setup. Track is too cold on test and tune nights to hook more than 24psi the way it sits. I'm changing up the suspension a bit, welding the diff, adding adjustable limiter chains in the front and trying adjustable bump stops in the back. Its been 11.0 @ 138, 7.3 @ 103 on pump gas and open diff. Pretty slow honestly for the money invested, but its a daily driven street car.

Thanks for taking the time Dave.

No fat powerband here I don't guess, big turbo, small displacement. Its weird, normally on most setups that leave my shop the gsr trannys make them feel faster, but this one is different, the ls trans makes it feel like a rocket.

I have considered this many times, this season I am limited at around 9.5k until I get a ati street dampener. I am also a bit worried about my retarded heavy valve terrain; supertech flat faces valves and kms cromoly steel retainers. Not real sure how far I can actually rev it once I actually get the dampener. I got this ported and polished ITR head from a NA guy, never changed the valves, tossed the TI retainers in the trash. Any insight on this?

I have some 26x9.50s, but that'l be plan C as I am already going though too many tranny parts.

I have a goal of going 140mph on pump gas [@~2500lbs], I'd like to see it happen, I'm about to cheat and go hot rodish as there are no rules around here. Import is an import, and that's it, there is no FWD/RWD classes, much less SFWD/Hot rod. Its either that or I'm building a turbo rwd.

24.5" tire, I've never had a setup that could actually make power at 10k, I'm pretty sure this one would benefit, I'm just scared to rev it at the moment.