On that last point, I think we only have one data point / opinion that the Supra LSD with 3.76 isn't a good match with a supercharger (TTurboPimp). Not quite sure why it isn't a good match (if true).

 

Actually, I have heard that opinion echoed by many [although I would be hard pressed to give you a name]. NA you can easily spin the tires with the 3.76. With the added HP/TQ of a boosted engine it's even easier -- too darn easy. End up wasting all the power melting you tires instead of moving forward.

 

yup, i have talked to couple of tuners and they all say don't get the 3,76 if there is FI, unless i somehow get super wide rims in the back and super wide tires and probably racing slick. the high gear ratio will cause MASSIVE power suddenly dropped on the ground and without some serious traction, you will just end up spinning the tires all the way

 

I've also heard it from Jeff (TTurbopimp) first hand issues with his RMM SC, and several other folks that deal with FI (Mo and others at SRT).

 

And with more power you can take advantage of taller gearing. The less you have to shift the faster you can accelerate. This also brings up interesting questions regarding matching the gearing to the type of driving that will be done. For instance, if you are concerned about 0-60 you obviously don't want to have a shift point right before you hit 60. And if you are concerned with the quarter mile, then you want to have as few shifts as possible in the quarter.

I was reading in Motortrend or Car & Driver a while back a review on either the WRX or the STI, and they were talking about the poor gearing relative to the performance tests they regularly run. They said the car was perfectly geared for rally driving but fared worse off than the HP/TQ would suggest in the 0-60/quarter because the shift points were just a bit too low, i.e.- the 0-57 might have looked great but shift required to get to 57+ caused a 1/3 second delay.

 

I was under the impression that the TRD clutch-pack LSD was better because it could handle higher HP, primarily.

Everyone seems to agree that FI and 3.76 makes lots of smoke. But life is not just from stop lights. I always thought the 3.76 would work well at highway speeds, passing, etc. What does the group think? I notice mine puts me in a better power band when passing at 60 or so, it only drops down one gear and has plenty of power. With the stock gearing, I needed to keep pressing which inevitably made a second downshift happen when we were window to window. Most people probably thought I was doing it on purpose.

Has anyone actually run FI with 3.76?

 

What issues did he have, besides roasting tires if he wanted to? My guess is maybe hitting the rev limiter if the tranny can't shift quick enough with all that power.

 

now we are getting into more details of tunning. i talked to jeff about his setup and why he gave up on his rmm unit, he said that initally the problem was the rmm unit makes the car shifts SUPER fast, and sometimes it just keeps on boucing off the rev limiter before it shifts. it's more of a ecu setup i guess, and srt helped to fix the problem

but then it also post another problem. with the power of the fi giving 400hp at the wheels, you want to stay longer in your power band. with the rmm unit you rev up quicker and it will force you to shift knot the next gear sooner, and you will need to go into the next power band to get the power.

i think that's another reason why he wanted to go with the trd lsd and the stock rear end ratio so he can stay in the power band longer

i hope i am getting things in the right order @_@

 

HI im try to get that LSD so i really need some answer from u
1. what different between your LSD and RMM LSD?
2. will it kill my VSC system?
3. how much u paid for your?( like u said u got $300 less than RMM its cost around $1500)
4. How i can get one like your ( please give me the phone # so i can call and order)
5. HUm..... thanx alot hehehe
please reply cus i cant wait to get one like your
KevinLe

 

Hey Kevin.

1. what different between your LSD and RMM LSD?

None.

2. will it kill my VSC system?

No, but VSC will interfere less.

3. how much u paid for your?( like u said u got $300 less than RMM its cost around $1500)

I paid way less than $1500 but mine was used.

4. How i can get one like your ( please give me the phone # so i can call and order)

Can't help there.

 

first i need to congratulate nudderGS400 welcome to the 3.76 club.

i got mine from rod millen. is yours a supra lsd, and was it brand new. when i was after mine carson toyota had a supra one for $1650 one hundred and fifty more than the rod millen one. i'd be shocked if they dropped the price $450.


i love the 3.76 and i was really surprised at how it effected acceleration at passing speeds. incredible. i cannot imagine going back to the stock differential. my wife has a gs400 also with the stock diff. and while it is fast it is not as fast as mine. the difference is quite noticeable. i love blasting off from a stop or punching it in third gear at 3500 rpms it just snaps your head back. going around a sharp corner is another thrill. downside is increased torque on wet streets can send you into a spinnout.

car also has increased traction in snow. not that you worry about that in phoenix

install for me at independent shop was about $250


great mod well worth it




3dog

 

After reading your comments, I can't wait to get mine on. I already called my mechanic to find out the install cost for this and the EDFC and I was quoted $250.00 (Canadian), so that means my install price is awesome!

 

one guy here try to sell me a 99 gs300 differential for $500 and i plan to buy it for my 2000 gs400 is it a good idea?
1. i undertand then gs3 got no LSD but please tell me wut LSD will do and the regular differential will do and what the different between them
2. does anyone here know FOR SURE then its will fit into my gs400, cus i m not able to refund
3. i also know the diff between 2 ratio ( gs3 3.92 and gs4 3.2x and rmm or supra tt is 3.76) so between gs3 and supra we talkin bout 0.16 diff on ratio so i hope then its gonna be no problem, if im worng please corrected
please reply me guyss cus i really luv this ratio upgrade just try to cut off some money b4 calling RMM =o)if i can

 

I was doing a little search for LSD that would fit GS3 3.96:1. The only thing that I've came close for it is another 88 supra LSD 4.10:1. Has anyone with a GS3 done any LSD install?

 

Putting an open GS300 differential on a GS400 is a BAD idea. You'll waste gas AND spin ONE wheel more often. Makes no sense. Don't do it.

If you don't want to pay RMM price for the Supra LSD, check around for one from an actual Supra.