Performance Forced induction, intakes, exhausts, torque converters, transmissions, etc.

Pros/Cons of Changing from a 3.26 to 3.113 LSD Ratio

Thread Tools
 
Search this Thread
 
Old 07-08-07, 07:17 AM
  #16  
GSteg
Rookie
iTrader: (15)
 
GSteg's Avatar
 
Join Date: Jul 2005
Location: CA
Posts: 16,017
Likes: 0
Received 79 Likes on 61 Posts
Default

no, he's implying that the stock differential wil be better only at certain speeds. But for all other speeds, the supra differential will be superior.
Old 07-08-07, 09:34 AM
  #17  
JBrady
Lexus Champion
 
JBrady's Avatar
 
Join Date: Feb 2001
Location: Texas
Posts: 3,124
Received 30 Likes on 24 Posts
Default

Originally Posted by Rock-a-Lex
J...So it sounds like getting a 3.76 Supra TT LSD is a complete WASTE on a GS400 actually hurting performance...isn't that what you are implying?
First off to reduce confusion I have edited my post removing the word Supra because BOTH the 3.13 and the 3.77 ratios are Supra ratios.

NO I am not saying 3.77 is a waste. It gives you the most torque at the wheels (of the 3 ratios listed) from zero to 38mph. It is again superior from 46mph to 59mph and again from 71mph to 90mph and finally from 108mph to 128mph.

I am making the point that at the other speeds the other ratios have the advantage.

Now, another consideration is gear change time. Our cars shift slowly. The more shifts made the more time is lost. Looking at the chart you will see that the stock car only needs 1 shift to 60mph vs 2 shifts for the 3.77 gears. It also needs 3 shifts to 100mph vs the 2 shifts for the stock car. So, measuring 0-60 or 0-100 the 3.77 often does not improve. BUT, in the ranges it has the advantage it IS DEFINITELY an improvement. Of course in FEEL the 3.77 will FEEL better and torqueyer because for the most part it is. And FEEL is the most important component of FUN.

Last edited by JBrady; 07-08-07 at 10:13 AM.
Old 07-08-07, 07:35 PM
  #18  
GS FONZy
Lexus Champion
iTrader: (6)
 
GS FONZy's Avatar
 
Join Date: Oct 2006
Location: ca
Posts: 3,729
Received 4 Likes on 4 Posts
Default

Originally Posted by jbrady
When changing to 3.77 gears (3.769) the top speed drops from the limited 149mph to 130 or so. It is possible that the reverse is true and the 3.13 gears will raise the speed limiter to maybe 155mph
Obviously the 3.13 car will run away from the 3.77 car from 130 up
the car will still cut at 149mph because it has a speed governor
Does anyone know what the RPMs are at 149mph?
Old 07-09-07, 04:12 PM
  #19  
Rock-a-Lex
Lead Lap
iTrader: (4)
 
Rock-a-Lex's Avatar
 
Join Date: Jan 2007
Location: NY
Posts: 4,519
Received 17 Likes on 16 Posts
Default

I'm not sure about anyone here but if I'm racing someone from a 30/40mph roll or from a stop I probably won't race past say...100 or 110mph because then it just gets REAL dangerous AND any gains from either car would be very subtle such as having to go 120mph for about 20 seconds or more to come back from a 1 car trail. Also, keep in mind the longer you drive at those speeds the better chances of you, him or both of you getting BUSTED!
Old 07-09-07, 05:50 PM
  #20  
GS FONZy
Lexus Champion
iTrader: (6)
 
GS FONZy's Avatar
 
Join Date: Oct 2006
Location: ca
Posts: 3,729
Received 4 Likes on 4 Posts
Default

Originally Posted by Rock-a-Lex
I'm not sure about anyone here but if I'm racing someone from a 30/40mph roll or from a stop I probably won't race past say...100 or 110mph because then it just gets REAL dangerous AND any gains from either car would be very subtle such as having to go 120mph for about 20 seconds or more to come back from a 1 car trail. Also, keep in mind the longer you drive at those speeds the better chances of you, him or both of you getting BUSTED!
stopped, 30 or 40 i hope this is not in city streets where cars may pull out in front of you, kids playing, ect... besides racing is racing. it does not matter if you are going 25, 50 or a 100 mph. a speed contest violation does not care what speed you were going. i say take it to the track, that way you can tell if any gains were made. anytime i add a new mod i go to the track, that way i can see if the mod made any diffrence. However; there are times i brake cars off in the freeway specialy sports (wannabes) cars that don't know about the power our GSs push anyways, keep it safe.
Old 07-09-07, 05:52 PM
  #21  
mikevanle
Lexus Test Driver
iTrader: (1)
 
mikevanle's Avatar
 
Join Date: Nov 2004
Location: South Jersey
Posts: 1,536
Likes: 0
Received 1 Like on 1 Post
Default

What Supra diff are you looking at actually? I assume you are talking about the 6 speed diff because of the gearing, but it won't be a direct swap...

:stickpoke:
Old 07-10-07, 05:43 AM
  #22  
Rock-a-Lex
Lead Lap
iTrader: (4)
 
Rock-a-Lex's Avatar
 
Join Date: Jan 2007
Location: NY
Posts: 4,519
Received 17 Likes on 16 Posts
Default

GS Fonzy,

Stop - meaning from a traffic light. We have a lot of 4 lane (2 lanes each way) roads that do NOT constitute as highways and are NOT residential roads either. That would be a good, safe road to drag on albeit that their are no other cars on the road at that time.

30/40 mph roll - a lot of people like to start a race at around this speed; commonly a highway. IMHO I think it's a lot more exciting rather than starting at 80 or 90. A LOT more activity happens at lower speeds on any car. Even if it's a high performance modded TT Supra; as fast as the pull is at around 110 it is usually that much greater at lower speeds. "Usually" meaning that you didn't put ridiculous, non-common lower gearing to "purposely" have a more responsive top end rather than have it down low.

I agree with you as far as bringing your car to the track to see if recent mods made a difference. Again, IMHO if my car isn't getting AT LEAST low/mid 13's in the 1/4 mile I think bringing it to the track is a waste of time...because there are SOOOOOOOO many cars out there at the track that are MUCH faster than that with little or no modding. I, just like all other 2GS owners out there wish that my car could be real fast without FI; I must resent the fact but it's impossible. The car will be quick but NOT real fast. You can DUMP over $5K strickly on go-fast bolt-ons and it MIGHT make you get a 13.8 in the 1/4 mile. My next car whatever it is will be an animal or have the POTENTIAL to be an animal. For now, I'll just love my GS for what it is.

Last edited by Rock-a-Lex; 07-10-07 at 05:53 AM.
Old 07-24-07, 08:32 PM
  #23  
lexispoold
Pole Position
iTrader: (1)
 
lexispoold's Avatar
 
Join Date: Dec 2003
Location: Maryland
Posts: 242
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by mikevanle
What Supra diff are you looking at actually? I assume you are talking about the 6 speed diff because of the gearing, but it won't be a direct swap...

:stickpoke:
yea since when did the 6spd torsen diff work with the gs400 pumpkin?
Old 09-30-07, 09:08 PM
  #24  
nytoy
Driver
 
nytoy's Avatar
 
Join Date: May 2007
Location: ny
Posts: 169
Likes: 0
Received 0 Likes on 0 Posts
Default

has anyone actually done the 3.13 swap to work?
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
818GS
GS - 2nd Gen (1998-2005)
31
10-27-14 05:47 AM
LEXSOOS
Performance
19
10-30-06 10:03 PM
D-MAN63
SC430 - 2nd Gen (2001-2010)
9
06-25-06 12:04 PM
LasVegasGS
Performance
21
07-28-05 07:42 PM
lex400sc
Performance & Maintenance
3
10-28-04 03:13 PM



Quick Reply: Pros/Cons of Changing from a 3.26 to 3.113 LSD Ratio



All times are GMT -7. The time now is 03:39 PM.