SCWells72

So obviously I've been here on CL for quite a while, and I've modded my car with L-Tuned and TRD components. I've shied away from things that aren't concretely under warranty, but with the recent conversations about the SRT Race ECU and TorqueMaster plugs, I was wondering about the maximum performance gains possible without going to forced induction.

As far as I can tell the following would be a pretty damned nice setup:

* Dragon torque converter - optimize power put to the ground
* TRD limited slip differential - hold that power to the ground
* SRT Intake/Race ECU - optimize intake side
* TorqueMaster plugs - optimize combustion
* L-Tuned exhaust - optimize exhaust side

Obviously there are other options available for these components and I'm just specifying my preference on each.

I know that the gains from mods aren't necessarily additive, but I'm trying to figure out the net gains in horsepower/torque at the crank/wheels and the overall "seat-of-the-pants" performance gains in 0-60 and 1/4 mile times.

I'll take a stab based on what I know and say that I'd expect the following:

* TC - shave ~0.5 secs off 0-60
* LSD - helps the TC do what it's doing; no real change
* Intake/ECU - +20HP/lb-ft at the crank
* Plugs - +10HP/lb-ft at the crank
* Exhaust - +8HP/lb-ft at the crank

So on a GS430 with all of these mods and resetting the ECU to accommodate for the changes, would it be safe to assume that I'd be looking at ~340HP/365lb-ft and 5.1-5.2 sec 0-60 times? I'm sure this is wrong, so what I want to know is what the real answer would be.

Yes, I've seen the FAQ where different components are added and the 0-60 times are shown, but that takes into account heavier wheels, stereo equipment, etc., and doesn't take into account the new Race ECU and TM plugs.

Any info is greatly appreciated. Feel free to move this thread into the Engine section.

Regards,
Scott

JAC JZS

Actually Scott I don't think that your #'s are that far off. The fastest NA GS4 that I know of is Mean Genes'. He has the SRT HFI/ECU/TC RMM LSD & Borla exhaust on his car and it puts out approximately 342.6hp at the flywheel(274.1RWHP). He ran a 13.79 @ 106.2 and I believe runs around 5.1 0-60. I also know Gene was working on putting in Star spark plugs in his car so that might have upped hp as well. The work he has done is quite impressive.

bravo261

iTrader: (1)

those are some good numbers Mean Gene has. anybody know of Gs's and their specs that dip below 5.0 without forced induction?

bitkahuna

iTrader: (20)

No chance. Maybe if you took out all the seats, airbags, spare rim, and put on lightweight 16s - haha

buckwild

HATE TO SOUND LIKE A SMART *** BUT IF YOU ACTUALLY DO CARE THAT MUCH ABOUT YOUR ETS AND YOUR 0TO 60,THENGET OFF THE PORTCH AND DO SOME SERIOUS MODS!!!YOU COULD DO A DRY NOS SHOT SAFELY AT 65 AND YOUR DEALER WOULDNT EVEN PICK UP ON IT!!!TRUST ME,I HAVE A HYBRID TURBO,NOS-DIRECT PORT,AND THE DEALER STILL HONORS MY WARRANTY.PLUS IF YOU COULD GET STRAIT TALK LIKE IM GIVING YOU NOW,YOUR L.S.D.IS GOOD FOR 710HORSES AND YOUR TRANNY IS GOOD FOR 52O HORSES.SO DONT WASTE YOUR MONEY YET ON ALL THAT STUFF UNTIL YOUVE GONE TO A SUPERCHARGER OR TURBO.PLUS IF YOU WANT TO SAVE YOUR WARRANTY,AS SOON AS YOU CRACK OPEN THAT TRANNY TO PUT IN YOUR TORGUE CONVERTER,YOU JUST KISSED IT GOOD BYE CAUSE THERE IS A DYE THAT GOES OFF AND WE DONT EVEN KNOW IT!!!REMEMBER WE HAVE THE SAME BLOCK AND TRANNY AND REAREND AS A AUTO SUPRA!!!!!!!!!!!!!!!IF YOU NEED MORE HONEST ANSWERS CONTACT ME

SCWells72

Holy tamoley those are some serious capital letters you have going there, buddy!

So while I'd love to have a low 5 second 0-60, I actually still care about things like warranty and comfort. This was more a curiosity question than an indication that I'm about to load up the car. Lots of non-forced induction mods around and I wanted to know what the overall possibilities are.

I've ordered L-Tuned exhaust which should arrive in less than two weeks, and at most I might do TorqueMaster plugs and a K&N air filter after that since they're relatively non-intrusive, and those only after chatting with my dealer's service guys about them.

Like the Nissan ad says, "just because you could, doesn't mean you would" (or something like that).

Thanks for the good info, though, JAC JZS. It's nice to hear that my #s weren't too far off the mark.

GS400_PUSHER

I don't know about down there but up here it is ilegal to have NOS in your ride on public streets . This was news to my ears when I first heard of it:eek:

JAC JZS

No problem Scott

RacingAristo

For performance mod, I have:

SRT Intake/Race ECU
Precision Industries TC
TM Plugs (waiting for Steve to pick them up)
APEX WS Exhaust (cat-back)

I will do some run when I install the plugs and post up the result here in CL.

By the way, I have 430 so you can use it as a reference.

bravo261

iTrader: (1)

sure about no chance? if mean gene got 5.1, there's gotta be few things to push it to 5.0 or 4.9. perhaps taking my 167lb fat a$$ helps. yup, 5'6" and i'm a thick 167lb. there's my primary problem!

Mean Gene

Scott - Actually, I did a single 5.1 sec 0-60 run but have done back to back 5.2's so I'm confident that I can pull those again. It's really more in your launching technique, IMO. Yeah, my GS has the power ( roughly 340+ RWHP ) but too many rpms at the launch will blow the tires away & too little doesn't yield the best times. I'll have to look up the 13.79 ET & check my 0-60 time for posting. Hope to install the TM plugs next weekend but the downside to dragging this time of the year is the 90%+ humidity here in Louisiana. Maybe I can find a reasonably cool night to head to the track but if not, there's my "private" dragstrip plus the trusty G-Tech Pro!!

bitkahuna

iTrader: (20)

How do you manage that without FI?

LexusRules

maybe he means 340flywheel?

forced induction can yeild as much power as the engine can handle. Usually in the range of 100 - 300% HP gain at MAXIMUM tune.. the turbo "kits" you find are really small turbos designed for maximum driveability. Im not talking about all kits however.. those HKS twins are KILLER and if tuned right will give u 500% HP Gain!!!

(170RWHP - > 1000RWHP)

bravo261

iTrader: (1)

i'm with lexusrules. 340rwhp is 100 over stock, which will have to push a car under 5.

mean gene,
after you install those plugs, make sure you inform the rest of us. i'm definitely going to try to watch your progress

Mean Gene

Thanks for catching the misinformation, Bit!! Of course I meant flywheel horsepower. I've been LONG overdue for another senior moment anyway!! :eek:
Only other trick I have is to install the new "Race" ECU which I received last week. I'll try to do the changes one at a time & post any results ( good OR bad ) as they happen.