Is LSD neede for a FI gs3?
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Originally Posted by D2-AUTOSPORT
yeah i was thinking of that after i posted. the GS3 has shorter stock gearing than the GS4, I think a GS4 stock is 3.32 or something like that. RMM would actually give taller gearing!
92-00 Lexus SC300A 4.272
92-98 Lexus SC300M 4.080
92-97 Lexus SC400 3.912
98-01 Lexus SC400 3.266
02-03 Lexus SC430 3.266
92-96 Toyota SupraNA 4.272
97-98 Toyota SupraNA 4.080
93-98 Toyota SupraTTm 3.133
93-98 Toyota SupraTTa 3.769
Going from a 3.912 to a 3.769 is a loss of less than 4% of RWTQ.
A nice upgrade for the non-FI guys would be to find a Limited Slip from a 93-96 naturally aspirated Supra with the 4.27 gears. This would give an increase of over 9% RWTQ.
Going from the GS400s 3.266 all the way to the 4.272 is a gain of almost 31% RWTQ
To put this in perspective, if a dyno "says" 250rwtq... that is actually calculated back to engine RPM. Truth is RWTQ is multiplied by the gears. 1st gear in the 400 tranny is 3.35 to one. Stock diff is 3.266. So, 250 x 3.357 x 3.266 = 2741rwtq in 1st gear
Change that to 4.272s and the number becomes over 30% greater... 3585rwtq
Last edited by JBrady; Aug 11, 2005 at 09:41 PM.
jbrady is the man.....
4.27 on the way....no rev limiter isues with 3.92 and 20's non FI........VSC has to be off.
rev limiter issues if you torque brake.
cornering with a clutch-type LSD is amazing......you'll never go back after clutch-type LSD....regardless of chatter.
4.27 on the way....no rev limiter isues with 3.92 and 20's non FI........VSC has to be off.
rev limiter issues if you torque brake.
cornering with a clutch-type LSD is amazing......you'll never go back after clutch-type LSD....regardless of chatter.
Last edited by slowdiver; Aug 11, 2005 at 08:30 PM.
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Originally Posted by joshoowa
on that list you forgot to mention that all of those lexus rearends have no LSD.. i also believe not all supras have LSD either, i think all TT's have it for sure but not all N/A's
The ONLY available factory LSD available Lexus car is the IS300. I do not know if there is any compatibilty with the other carriers or housings.
All 1993-1996 Supra TTs had LSD. For 97-98 it became an option on the TT automatics. It was an option on the non turbos for all years.
Super Moderator
Joined: Jun 2001
Posts: 2,601
Likes: 3
From: California
Originally Posted by bluelex
I'll ask this Q and please don't laugh, where is the LSD installed in our car?
The actual "Limited Slip" mechanism (i.e. LSD) is a small portion located within the rear differential housing (often called a pumpkin). For some reason, many people confuse the final gearing ratio (i.e. 3.76, 3.91, 4.3, etc) with the LSD part. The two are there for different reasons, but they just happen to reside in the same pumpkin housing. The type of LSD you need will depend on the type of driving you will be doing. For most high-powered turning situations, a stock LSD from any car will NOT suffice, and a clutch type/mechanical LSD is a MUST.
Lexus Fanatic
Joined: Aug 2004
Posts: 6,947
Likes: 4
From: Florida
get the complete supra LSD
the taller 3.76 gears compared to stock 3.90 might be a better match for FI anyways......longer gears for more time to make boost. plus you get the posi rear end
I think it'd be a wise choice.
I think it'd be a wise choice.
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