Lsd ?

[UZZ30-Québec]

Why did lexus not equip the car (SC400) with a stock LSD ???

is it because there is a traction control to do the job instead of a LSD?

I have a 89 Mark 3 turbo supra LSD (manual trans) could i swap something to the SC to have a Limited slip unit? Downside is that it's not the same gearing, but i might be able to exchange it with someone who as an automatic turbo supra LSD (wich is also 3.9 if i remember well)

having the manual supra gear would be nice for highway since the car revs a lot at 140km/h (3000RPM) but i'd lost a lot of acceleration

This car defenetly needs a 2nd overdrive. But anyway, the main question is WHY and CAN

I could also swap my Black MX-83 LSD and put the supra one on it, since this car only do highway. MX-83 has a 3.9 LSD unit from factory in canada.

thx.

 

[jibbby]

Why? Probably because the SC4 is not a true performance car and more built for luxury...Just notice the stock torque converter, not in a million years can you get that one wheel to spin out off the line...Supra's are all sportscar and come powerful enough at factory where an LSD is actually needed for traction...That is my quess,,,

If you have an SC400 the only LSD that will work in the swap and match the gearing is a 1993 + Supra TT automatic....I have never heard of a pre 93 working out...Are the pumkins even the same, I don't think so....Good luck...

I am running a 1993 Supra tt automatic LSD on my 1992 SC400 for over a year and it is a perfect match and I can't say one bad thing about it..

 

[UZZ30-Québec]

ok thanx for you comments.

those differentials must be very hard to find?

BTW, i don,t think the Cressida was a true sports car :slaphappy and it came standard with a LSD.

 

[jibbby]

Not easy but doable.. I found mine rather easy at a local junkyard in Los Angeles, Ca... I hear you can usually find one for sale on the Supra forums....Good luck...

 

[UZZ30-Québec]

ok, I'll get some real horsepower before going for LSD, i was asking the question just because i have that MK3 LSD and i don,t know what to do with it.

 

[jibbby]

I think the LSD is great if you live in bad weatheR FOR EXAMPLE - driving around on icey or wet roads it is safer when traction is so important, even during normal driving conditions... How about if your stopped on a steep hill that is wet, snowy, or even slightly sandy, the LSD is key to get the car moving...Where as with the stock differential you may just sit there spinning one wheel or worse spin and slide.....I think All and all the LSD is a good choice even if you don't have tons of powers.. Trac control is over rated because it still operates with the open end differential..

 

[UZZ30-Québec]

I won't drive the car in winter and on rainy conditions, with my 18 inches and sports tire i don't have traction issues, unless i floor the car on launch. Yes, the LSD is fun for powerslides and in winter but open diff is not that bad.

 

[sinai]

for the power that an sc400 comes with stock, woudlnt an lsd be a sig. upgrade? thats wat i want my first mod to be....mainly cus i want to work wit wat i got first, THEN start goin all out...wat does n e one think bout that?...just wondering i guess, i find it rational.

 

[UZZ30-Québec]

do you have a SC400 yet?

once you'll floor the gas on a red light, you'll understand why you don,t need a lsd lol...

take-off are very slow for the 260HP announced. Once it's moving, it moves fast.

 

[WDoherty]

sinai, a stock sc400 doesn't have enough power to need an lsd, not even close.

 

[UZZ30-Québec]

it has, it's just that the engine sleeps beyond 2500RPM you gotta wake it very smoothly.

 

[jibbby]

You need to get out and push to get these SC's moving from a dead stop...If your car is stock and you don't drive in winter condition there is no need for an LSD...

Your first mod should be a Torque Converter....

 

[UZZ30-Québec]

You need to get out and push to get these SC's moving from a dead stop...If your car is stock and you don't drive in winter condition there is no need for an LSD...

Your first mod should be a Torque Converter....

answer me dude, so i'll finally know what is going on.

Is it slow only for the 1st 40km/h, or is it slow for all the 1st gear??

am I the only one who has a car that pulls more on 2nd gear than 1st gear?

Can someone also tell me what is the stall speed of a A-341E stock T/C, I'll try to find the stall speed of a A-340E on cressida forums.

 

[sinai]

so the T/C will give it more push from a dead stop?

wat bout get T/C and THEN the lsd?

is that car really that much of a pig?

no, i dont have one yet, im debatin the year to get, rite now its a toss between 92-95

 

[jibbby]

Ok fella's listen up.... The stock lexus/Soarer torque converter has a rediculously weak stall rate made for old people who don't want to spill coffee on their laps......An upgraded torque converter like a "Dragon Torque Converter" which I have been running for about a year now allows you to burn rubber from a dead stop..Turns your luxury lexus into a real Sports Coupe....Like I said a new torque converter should be your first mod to wake up your SC....

Don't know the stall rate, forgot...

First gear has power once the rpm's get up to about 2000rpm....However, from a dead stop all the sc400's at stock are slugs out of the blocks and are a joke.......Biggest disappointment with owning the SC400's has got to be the Torque Converters....

PS. If you can't afford a new Torque converter you can always try brake torque'n out of the blocks:tongue1:

 

[UZZ30-Québec]

well, then next tuesday i'll go on a drag strip to finally know if my SC pulls OK or if it doesn't.

 

[jibbby]

It will pull after you get up to about 20mph....However from 0-20mph you may have time to take a nap, eat something, listen to a full song, etc..with the stock torque converter.....That is if it is floored......If not :sleeping:

The stock SC4 Kinda feels like a weak 4 banger with a really good turbo, but has serious lag time....That is how I can best desribe the stock SC400's...That is what you should expect to find and feel......Great cars other then that...also try using the ETC button that holds the rpms a little longer before shifting...The stock converter does give you some juice at high rpm's....

 

[UZZ30-Québec]

Yes, it pulls passed 20MPH, the problem is that the car pulls more in 2nd gear than 1st gear and i don't fuckin know why, I feel a lot more the engine torque in 2nd gear.

how much does it costs for an upgraded T/C ?

i was thinking about a set of headders for this summer but you're making me thinking about a new T/C. Is it still fun and smooth on city driving? what's the stall speed of the upgraded T/C ?

 

[jibbby]

2nd gear is the best gear in the sc's for power...First gear is weak because of the stock torque converter "Do you understand why now" it is that simple.. There is nothing wrong with your SC that is how they are...sorry bud...with an after market TC your 1rst gear becomes king and 2nd gear stays the same pretty much.....Let it be known you will lose a little on the top end like 4th gear but the gains far exceed the loses...

Too Re-work your stock tc maybe will cost you around $400 or so...but you have to send it in and wait...The ".Dragon Torque Converter" runs for about $900 last I checked....Installation $300.... Not cheap my friend...not cheap...

 

[UZZ30-Québec]

well, it looks like in my budget for a TC reworking and Headders.

If I'd go with the reworked TC, and a set of headders including a new twin 2 1/4 exausth, should i be able to go Low-14 ??? that would be a BIG improvement compared to the stock Low-flat 15 on the 1/4 mile and i'd be very happy for this summer. for the installation, i can do this myself.