CmputerWiz

You need at least 400 at the wheels to get low 12's. You'll be getting high 12's with 350hp, IF you have a GOOD launch.

SR

JAC JZS

I agree with CmputerWiz

Bean

iTrader: (1)

welding the stock manifolds would result in a ghetto fab job... it'll end up leaking and looking like crap... on every car that i've seen that, it looks like crap and ends up leaking because the welding just doesn't work

I also agree with CompWiz.... 350rwhp will only net you a high 12 or low 13... that means you'll be as fast as a basic upgraded 300zxTT... oh wow! See what I mean when I say 400bhp (350rwhp) isn't enough power?

450rwhp would be good for high 11s with a good launch (thats gonna be hard considering traction issues hehe ) prolly around 118-120mph trap speeds... thats Viper territory

Toog4me

So it wont be a M5 or M3 or AMG killer? Cuz i know with 300 hp its 6.3 to 60, so ide think with 350 it would be around 5.5-5.7???

ARB

Yeah, but it will still be pretty fast

Toog4me

Oh for sure it will be fast... How much HP do you need to get into M5 territory? Around 400???

Bean

iTrader: (1)

that seriously depends on what you call fast... around here; a 13sec car is just another car on the road


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to be an M-killer you'll need around 350rwhp... but 400-450rwhp would be much better and put you in Viper territory... i mean seriously guys... raise your expectations a little bit... 13seconds is only fast for so long... once you run a Z06, modded LS1, or SupraTT BPU you're going to wish you had alittle bit more than 350rwhp

Hermosa

Toog4me remember that we are talking RWHP not at the crank or flywheel. 220rwhp for the SC4 is around 0-60 in 6.3

healerhand

HP is like sex. Its never enough. hehe. 500-600 rwhp is what i am looking for. I dont mind putting a Ford tranny in it. My weekend driver is a 11 second car.

Bean

iTrader: (1)

find a T5 adapter for your motor; and we'll set you up with a Borg-Warner T56 6-speed bulletproof tranny

healerhand

6 speed Lexus LS 400? That will be total sleeper. I jacked up my car earlier and re-assess the OEM manifold. It looks like the oem manifold have flanges ready for T3BB bolt-on. As far as room is concern. Removal of the Cat-converter will have a lot of room, which is perfect for a T3.
The return tube will be loop around next to the suspension componants (around engine) inside of the shock. I am plan to use 2.5" to 3" pipes. I can get those pipe made at a local muffler shop. Intercooler will be custom.

Bean

iTrader: (1)

yeah removal of cats is a good thing

thats what the downpipes would do that I'm thinking about... 3" from the turbo (internal wastegates so no need for dumptube routing) to the main cats... this eliminates a lot...

and you can run a straight-thru system with no cats at all on a turbo car and it won't be too loud... it WILL be loud; but very smooth and not droning at all... a TT DOHC V8 will sound like heaven on wheels

healerhand

Due to the location of the turbos. I will need an oil sump with pump to return the oil back to the engine. Its doable. I called up www.lexus400.com and talked to Tony N. He stated that i can get my ECU reprogram and tune for $1,249.00. The price is kindda high.

This is what i gather so far:

-Turbo: Twin T3BB
-Head Gasket: SCE Copper .093" -it should lower the compression by 1
-Head Studs: ARP-Custom order
-Intercooler: custom
-Plumbing-custom
-Injectors: Upgrade to proper size (maybe using stock Supra TT injectors)
-Ignition: MSD DIS-4
-ECU: Custom reprogram and tuning by Lexussc400.com
-Fuel:upgrade fuel pump (walbo 255 L/H

I plan to pump max at 15 psi. Of course normal driving would be around 6-7 psi.

If i can pull this project off. I will slow copy the system and make aviable as a DIY Kit.

healerhand

by the way, i am re-reading Corky's Max Boost. Again for the second time.

Bean

iTrader: (1)

don't forget your transmission rebuild, limited slip, upgraded rims with big tires and new torque converter

15psi is gonna be a lot more power than you think; ESPECIALLY on twin T3s

reprogram your ECU? thats a really bad price... get a Haltech E6K for like $1100 and tune the damn thing yourself with a laptop and some dynotime... the Haltech has the benefit of converting to speed density and tossing the AFM out for no restrictions -- a gain of around 50rwhp for SupraTTs when they convert using a VPC

Or the more expensive Speed-Pro system which tunes itself