Hey guys,

I'm sure some of you can speak from experience on this topic but I'm mainly wondering what to expect as to the performance numbers for a GS430 with SRT intake/ecu (roughly +35hp) and 3.76LSD. I'm considering this upgrade in hopes to get around a flat 5 second 0-60 car.

I'm looking to get people's best guess (or actual data) on the 0-60 and 1/4 with only these two upgrades.

Let's all assume we run two cars side by side under normal conditions. One stock (~300hp, ~0-60=5.9, ~1/4mile=15.1), one with SRT intake/ecu and 3.76 LSD upgrades. Can anyone do the math here to figure out how much actual gain in performance there would be? Or, even better, has anyone done this upgrade and can speak as to the actual numbers, dyno's, street race results, etc?



And please do not respond to this thread with "well it depends on all sorts of variables (air temp, weather, elevation, etc) so there's no way to have any clue without scientific testing".

 

what if it does depend on all sorts of variables? haha sorry.. i can't help but i'd sure like to know the answer

 

one thing i noticed about this car is the long delay on kick down and some up shifts. i have an HKS intake - yeah it's worth the investment. installing the 3.76 gear would be a big improvement on 0-60 time and makes the car very responsive but top speed and fuel economy is not as good.

i also noticed sometimes when i have to beat a yellow light and i punch the accel. pedal, the engine revs up then it shifts. don't know if anyone have the same problem? no leaks and fuild level is fine.

 

anywhere from 13.8 to 14.8

 

Gsteg,

Seems like a big range(13.9-14.9). If I'm not mistaken, the gs430 runs the 1/4 in anywhere from 15.0-15.2. If a chip and diff only netted about .3 a second, it would be major disappointment.

Also, what would 0-60 times be at? Would you think 5.0-5.3 are possible with these upgrades? I think stock the car is listed at 5.9-6.3.

I don't mean to argue the exact stock times for performance. I'm more interested in the ball-park improvement one could expect from the extra ~35hp and geared rearend.

 

those time seems slow for a GS430.

The GS400 times were usually around low 14's (~14.3ish) and about 5.7sec for 0-60mph.

However real world kind of contradicts that. Some people run high 14s with a few mods.

http://www.jimmy540i.com/gs430.htm

The owner of this GS430 has the SRT intake, 3.76 gearing, PI torque convertor, Apexi exhaust, and he was only able to get 14.4 sec.

Then again you got someone else (forgot his name) who has a the PI torque convertor/3.76 gearing and ran a 13.7.

The times on CL is all over the place, and of course you know, it's the variables that takes place.

If you want to greatly improve your 0-60 times, you'll want to take a look at the PI torque convertor. Our OEM 1800rpm stall convertor is a limiting factor.

 

you're not going to see a 5.0 0-60... and as gsteg said the stock gs4 runs the 1/4 in low 14s.

 

will lsd mess up your VSC, i got a gs400 i want to get LSD for my car also, but dont know what to get.

 

if you are interested in getting better bottom end power, i don't think SRT would be the way to go.
if i wanted to get 5sec 0-60, i would start with weight reduction (lots of it), drag radials on a very light wheel, 3.76LSD, 2800-3000 TC, Headers, intake (non-SRT) K&N seems to run the coldest and safc. However, i still think you will not get a 5sec 0-60, but worth a try try a little or spend the big bucks and go FI
why interested in 0-60 i would think 1/4 mile
LSD will not mess up your VSC, it might make it come on less

 

i don't think thoes numbers are correct

"THIS LEXUS IS EQUIPPED WITH SRT (SWIFT RACING TECHNOLOGY) RACING INTAKE WITH ECU PROGRAM, A HIGH 3.76 LIMITED-SLIP DIFFERENTIAL FINAL DRIVE GEARING BY ROD MILLEN MOTORSPORTS, APEXi WORLD SPORT EXHAUST AND A TORQUE CONVERTER MADE BY PRECISION INDUSTRY"

THIS LEXUS IS RATED 327 HP AND 342 FT-LBS OF TORQUE
i will buy it when i see a dyno sheet with video.

 

I think thats power at the crank, which is reasonable with the intake and exhaust. ~27hp more at the crank. Intake and exhaust go hand-in-hand like a 2jz and turbo

 

how would they know HP, TQ at crank, unless they removed the motor and dyno it that way. i think they just added the power claimed by the intake & exhaust
numbers should not be posted unless you got a dyno sheet to prove the assumption

 

Very true. Might be worth while to ask Jimmy.

However they might be adding back the drivetrain loss and guess-timating the crank power.

Then again it doesn't bother me because I dont think much of SRT intakes anyways

 

The only reason why i am posting on this is because people can get the wrong info and all kinds of missleads can happend. the whole site is kinda iffy with the numbers posted. to tell you the truth, i don't even get why they are comparing diffrent cars HP & TQ without ever talking about weight, ect...
FI vs NA does not make any sense, but oh well

 

I was under the impression that gs400's and 430's ran low 14's as well. For what your aiming at I would go with a non srt intake, safc, headers and exhaust, lsd, pi converter, and a shift kit imo.