Superluminal

It's not as easy as it sounds. The Nittos "seem" to hook better on the street than the track. My tire size is also a bit too large for my setup so I launched up in the rpm band. My first 2 launches netted 1.8 60', because I bogged one and spun the other from launching too high.

It's also an extremely violent launch, especially with IRS. I cringe ever time I drop the clutch and the wheel hop starts, because I always have a bad feeling that either the transmission, rear end, or driveshaft is going to snap. Car is holding up fine so far. These T56 6 speeds can take a lot more punishment than I thought.

Superluminal

That's a wicked swap. Make sure he ditches the twin turbos, and installs a large single setup. 2JZ + large singe turbo kit + 240SX + traction = pretty much unbeatable car.

Quick Sh0t xMLx

Looking at his avatar I'm guessing it's a LSx S14.

Do you have anything done to the suspension on either car? Trying to get some info for my friends S13 since 95% of the guys on any 240 forum never ever go to the track AND actually do well.

Superluminal

Yes, I have full coilovers. I soften the rears all the way up, and raise the car to near stock ride height, for the drag strip. However, you'll get just as good of times by running stock suspension, as the spring rate and rebound is pretty good for launching. If you don't have the cash to get some nice coilovers, just run stock suspension. After that it's all in the driving and tire combo. Good luck, it's difficult. My LS1 240 gets better 60's than my SR 240.

fouz65

95 240sx, 02 ls1, t56, j30 diff (3.9), hsc lt headers, I/E, 255/40/17.

ill have to get some 275/40/17 on my next tire change and see how much more i get out of them. if you can hit 120 mph in 4th gear w/ the 4.08 gear then i should be able to hit 120 no problem. at the end of the 1/4 mile im doing 114/115 mph bouncing off the rev limiter w/ the 255's.

i hope i can hit your 60ft too

Superluminal

How is your traction out of the hole? If you're doing okay with 255s, then you have no need to upgrade. For my setup, the 275s are a bit much, only reason I went for them is a buddy of mine was selling them.

You should be able to hit 120mph in 4th. If not raise the rev limit a tad bit. Seriously, with a J30 rear end you're hitting the rev limiter at the finish? That's actually a taller gearing than the 240SX gearing. Generally the smaller the tire the more mph you're going to get out of it. I'm going through the traps at 118 at the top of 4th gear, and it's not tapping the rev limiter for me. I would say I'm a bit over 6000rpms at the finish. What else is done to your setup? That is strange that you're maxing out 4th.

By the way what times are you running?

fouz65

i have hit a 1.71 once on street tires. but i have rear camber problems and that 1.71 was after the tires have shaped themselves at an angle so i had a good contact point on that run. nexen 255/40/17.

going by a gear calculator moving up to 275 from a 255 will get me 3 mph more in 4th. still wont match up to your mph even with my taller gears.

my set up should be the same as yours but i've got taller gears, but smaller tires. everything else that would effect gearing should be the same. only other difference is the chassis, extra 180 lbs +/-.

my fastest 1/4. could be faster after i fix the camber problem and get some tires for a lower 60ft. i think i could match that 1.68 60ft then.
60ft 1.8202
1/8et 7.8814 @ 90.18
1/4et 12.1523 @ 115.74

wish i knew why my mph in 4th is lower then yours. even if its 5 mph every little bit helps.

Superluminal

Actually that sounds about right. You got 180lbs. over my cars weight. How much do you weigh? I'm only 150lbs. My LS1 is a pretty strong swap... but everyones motor differs a little. 115-118mph is about right for a bolt ons LS1 in a 2500-2800lb. chassis.

Your 1.71 60' is not that bad. I was doing 1.8 60's the same night I got the 1.68 60'. Both of those runs were high 11s. 11.85 and 11.81 respectively. I was testing out the tire combo trying to get the launch right. The last launch I got it took hook well out of the hole. Seemed good, but apparently it turned out to be a 1.68 60' - I also nailed the shift points on that run as well.

However, for the life of me, I can't figure out why you're tapping the rev limiter. What RPM are you going through the traps at? What is your limiter set for, it might be different from mine?

fouz65

rev limiter is stock. i think the 02 ls1 is 6300 rpms? when i go through the traps i probably bounce off the rev limiter about 4-5 times. im just a few feet short of making it in 4th before it hit the limiter. about 40 ft i think.

im 230 lbs. the car is 2840 lbs.
hopefully one day ill hit a 11.8 w/o changing anything. thats my goal anyways. just need tires and rear chamber fixed. then cam or spray or both.

Superluminal

My rev limiter doesn't hit at 6300. I can ride it out to 6500. Weird, since I didn't adjust the rev limiter. It might have been a default value that was used during the tune. I don't usually take it past that on stock valvetrain and pushrods. What are you using to tune the car with?

fouz65

it was dyno tuned. i have no clue. it could be 6500. i have the shift light set at 6k and before i cross the finish line it stays on for a good bit before the limiter. i never really look at the tach since i have the shift light.

Superluminal

I just checked today, my limiter is set at 6500. I don't often hit it, so I sort of forgot where is was. I don't use a shift light. It might be that I'm winding out the motor a bit more than you are. It depends on your tune, and if you make power up there, and also if you feel safe winding out the motor that high. I have a few replacement parts from the LS7 valvetrain that I installed to freshen up the motor before I put it in.

I guess you could call it Maxwell's Demons, that we can't figure out why I can trap higher. At least be gald you have a strong motor. I wouldn't worry to much about matching me. Save up for you next power adder and show me what's up.