Project 1990 LS400: Performance Mods
Neil Griffiths in Australia is one supplier:
www.rushimports.com.au
He is running a 13.5 1/4 mile on his 7psi non-intercooled setup on his Soarer (SC400).
Lexus Champion
Joined: Feb 2007
Posts: 2,489
Likes: 4
From: Lou-Evil KY
right now i'm just planning my build for aa full 2.25" manifold back exhaust, true dual pipes. we'll see how much it adds if anything. i completely understand why you want to make it a bit faster, why not! the sc kit sounds interesting, i'll have to look into it. i wonder how much nitrous the trans can handle?
Driver
Joined: Feb 2007
Posts: 116
Likes: 0
From: AZ
Another question is what can be done to beef up the tranny.
Depending on how far you want to take it, the stock transmission won't be able to handle it, not to mention its hard to find uber-tough automatic trannies. Shift kits and adapter plates can take you far, but have they been developed for our transmissions?
Depending on how far you want to take it, the stock transmission won't be able to handle it, not to mention its hard to find uber-tough automatic trannies. Shift kits and adapter plates can take you far, but have they been developed for our transmissions?
right now i'm just planning my build for aa full 2.25" manifold back exhaust, true dual pipes. we'll see how much it adds if anything. i completely understand why you want to make it a bit faster, why not! the sc kit sounds interesting, i'll have to look into it. i wonder how much nitrous the trans can handle?
Racer
Joined: Mar 2002
Posts: 1,833
Likes: 4
From: California
I'd suggest you start with suspension and brakes. Replace all your bushings, get some new struts in, get some new pads, maybe upgrade to the UFC20 calipers if you can... The combo of all new bushings (Daizen sway bar bushings + control arm bushings) and new struts will already make the car feel so much better. After doing those mods, my car is so much more driveable on the freeway. The car feels much more planted and body roll is significantly reduced when taking those turns at 75+ mph.
Lexus Champion
Joined: Oct 2005
Posts: 1,884
Likes: 6
From: TX
I think you need to set some goals first, figgure out what kind of performance level you want. You just want it to be faster than stock? Want it to be able to beat <insert car here> or run a specific 1/4 mile time? Then when you know what you want figgure out how much power it will take to push our heavy LS400's to those speeds in the times you want. I don't want to give out bad news but our cars are heavy, something that works against you when you want performance. Then when you know what you want and what its gonna take to get there, then begin planning your build.
iirc, a supra turbo slushbox should bolt right up but i dont think those are much good over 400-420hp either so
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JBrady
LS - 1st and 2nd Gen (1990-2000)
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Jun 18, 2021 08:56 PM
