lexi4darin

Guys I'm wondering if anyone has had any luck getting their GS4 from 0-60 in the low 5's or high 4's.

After all the searching and reading on the forum seems like there's no clear cut way to get much out of the GS4's, which really made me appreciate that Lexus is getting the most out of their cars.

However, has anyone tried to port and polish the heads / intake? Seems like with manifold and head porting, headers, and LSD that 4.7-5.0 60 times would be easily possible. I would think that would give an extra 50hp plus some better traction. Could probably try a tq converter too but I don't want to change the characteristics of the car too much/

Anyone tried this or got ideas about it? Also was wondering what the guestimate costs would be.

I've got a 80k mile car on my hands I'm wondering if reworking the top of the motor would get an extra second off my 0-60. This car needs more jump!

LexFather

You need FI to get any 0-60 time in those times you stated. Then the GS would need to hook up off the line perfectly.

Bolt ons will not achieve those times. You need at least another 100hp to the crank.

GS FONZy

iTrader: (6)

You can achive a 5sec 0-60. I droppped .3 on the 1/8 mile by adding S&S headers and another .1 with LSD. Almost half of a second with these two mods, but I already had K&N CAI and Borla exhaust.
Now just add fuel controller, lower gears, TC and some drag radial, that should put you right there.

2JZSoarer

Elevation 299ft above sea level.
People in vehicle: (2) 130ish lb each.
Gas in tank: less than half full.
Testing instrumentation: Gtech Pro.
Driving mode: VSC off, Power mode on, e-shift start with RPM up but not spinning.
Car's spec: Drop in K&N filter, axle back dual Magnaflow, 245/40/18 all around, 36 psi in tires all around.
Weather: Sunny day on March 8.
0-60mph: 5.4 seconds.
¼ miles: 14.0 seconds.

kit cat

iTrader: (6)

Hate to tell you but Gtech isn't that reliable...

macd7919

iTrader: (10)

A torque converter and an Lsd should get you close if not in the low 5 second 0-60. A torque converter makes the biggest difference to launching a Gs4 out of any bolt on mod you can do.

tofu_house

iTrader: (2)

Nope. Even with TC and LSD, you won't achieve those numbers.

Realistically, if you were to get the S&S headers, PI TC, supra 3.76 LSD, SRT intake, and launch perfectly, you'll be lucky to get 5.3-5.5.

The only way to achieve numbers in the high 4's is to go FI with the GS.

You could try to rebuild the engine but then you might as well go FI.

You have to understand that our cars are 10 years old. The new kids on the block with the 6-cylinders will give us a run for our money even if we were to have these mods.

kevs98GS4

iTrader: (1)

this thread should be in the performance section......just my .02

macd7919

iTrader: (10)

Don't know where your getting your facts but the 430 does 0-60 in 5.9 bone stock. If you think you wont drop off close to a half second on your 0-60 with a stall and lsd you should think again. I've installed plenty of those setups in 400's and 430's and it totally changes the way the car launches.

Rock-a-Lex

iTrader: (4)

I agree but what about no wheel spin using slicks and an A/F controller on top of all those mods? My results on the dyno before and after show additional gains of 16whp with the addition of the Apexi Neo ALONE! I feel 5.3 is very possible AND probable maybe even without slicks (but wide rear wheels 10" +). So that would answer the OP question..."yes, low 5 second range but not high 4's."

tofu_house

iTrader: (2)

I assume the OP doesn't want to roll around with slicks on the car.

5.3 isn't impossible but it's very unlikely simply because (again, assuming we're running normal tires), unless conditions are perfect, putting out a 5.3 0-60 isn't very likely. Even with all those mods, I'd say a consistent 5.4-5.5 would be VERY good.

This is all real world speculation of course. Theoretically, crunching numbers we should gain enough power and reduce enough power loss to put out numbers in the low 5's but realistically, it'll won't happen very often.

This is the direction I'm heading with my car so I'll let you guys know how it turns out.

Rock-a-Lex

iTrader: (4)

Good and agreed! Also, a VB upgrade would help a lot but you will lose a lot of the luxury aspect. Question, what about buying a TH400 tranny for the GS4 and skip the VB upgrade? Doesn't that tranny shift much better (quicker shifting) than the stock GS4 tranny? It is still a smooth transmission like stock?

aristo2369

iTrader: (2)

i never checked my 0-60 time but i've gone to the track and have low 14 times but because of my gears my top end is very slow about 94.5mph. if i had 3.76 gears i should be closer to 13.9 to 13.8 at 100+mph
285/ 10.5 in the rear.intake w/ airbox- 3000 tc. A/F controller, kazz lsd 4.26 gears.clean injectors, chipped. Custom 3inch exhaust from the headers back i would love to check my 0-60 but i have no means

macd7919

iTrader: (10)

A TH400 would make the car considerably slower. Those transmissions are good for high hp applications but they are power hogs. On big power cars they have been known to suck up 50-100hp. They are strong but not very efficient. Thats the opposite of what you need in this situation.

LexFather

We have report after report of people BARELY breakin in the 13s and I mean high 13s, 13.8/13.9 with every bolt on. The GS had its quickest 0-60 in 5.4 in Edmunds and I sure as hell am not sure how that happened. Most reports were 5.7-6.0 seconds. Lexus quots 5.7 and 5.8.

You simply need a substantial increase in POWER to get to the times the OP is recommending. I am sure a S/C bolt on GS could get that time, let alone a Turbo. If anyone has raced their 300hp GS vs 400hp cars, the difference is obvious and its clear why those car are substantially faster, say the M5 that breaks into the mid to high 5 second range. That is a 5.0 V-8 with 394hp.

Out of curiousity, does anyone know what the Aristo TT did performance wise? I figure that was a low to mid 5s car.