.....So tonight I am out with a friend who owns a boxster and we jump from a light...He leaves me spinning my ******* tires from 1st - 3rd gear (14psi on Gt35r with 275s on the rear) until he's about 1.5 cars ahead...I catch up pretty damn quik right after but still makes me wonder...Hmmmmm, how many of us are just driving on ice all day long? On the highway from roll it's great...

 

What kind of tires are you using? Wheel spin? Suspension setup? It is pretty hard to get good traction in a light powerful car, but many things play a role in traction. You could always look into one of those Racelogic traction control systems.

 

I'm running 15psi on my 35r setup on BFC comp T/a KD's with a full Tein suspension. I don't really have any traction issues. They'll break loose at the top of first and sometimes at the top of second but that's generally only on colder nights.

 

i run 20 psi on my pt61. (gt35r wheel). I dynod with a smaller turbo at 427rwhp@17psi. i should be making close to 475 to the ground and I have no problem putting it down. if its a little wet ill spin, or if its real cold the top of first will break loose but no big deal.

 

ES100s on a 40 degree night....Not the greatest thing for traction...Plus stock suspension...Now that I think of it I should probably just ******* shoot myself for asking this question...I just got H&Rs and will install those in a week and beginning of the year put Koni yellows with them....I guess this is where I am actually experiencing first hand how suspension plays a big roll in putting it to the ground.

Also, when I got home I checked my tire pressure. It was at 40psi ...I let some out and now at 32...Seems like the tires were even bowed and not getting a flat foot print. This was the pressure put in by the people who mounted my tires/wheels. What psi are you guys running for street?

 

I have stock size drag radials and stock suspension and I'm good
Those tires are huge and just not good at all if that's happening.

I run 32.5psi for the street you are running autocross/roadrace pressure lol

 

I have 400 rwhp at 14 PSI with 225/50 16 R compound tires and I can't floor first. Second spins some too in the summer time and in the winter, it's pretty much useless. Third can spin in the winter too!

Yeah, I am looking into getting some bigger tires!

 

Apnea, you need a better tire. The Kumho MX will hold the power pretty well, My Supra is around 400RWHP, and if I just leave the line like I would on the street, it so=pins very breifly in first, and then not at all. If I launch at ~4500rpm, they spin through first, and hook in second. Even 32 psi is too high for proper traction. The stock suspension will launch better than most performance coilovers, unless they are made for drag. You should be able to hook 400 no problem, you need to feed in clutch, not just dump it. Once you are moving, you should hook no problem with decent 275s. WARNING, if you have an organic(stock, or ACT/RPS street disc, your clutch wear will go up dramatically, also you will overheat the disc without ~20 minutes between hard launches. I use a Proprietary bronze disc from Horsepower Freaks, there are other, or double, and triple discs. It takes a seriious drivetrain to handle proper 400+hp launches repeatedly. Assuming you have an FD, your differential, and your axles are weak points. Carl

 

Just takes practice. Trying lauching on the street where you get very little spin off the line then you can't just stomp on the gas. You have to gradually apply the gas. You have to know your car and know when you can mash the gas and when you can't. You can invest in a rev limiter box or something like the bee R box. When your on the line with the clutch in you can mash the gas to the floor and you'll bounce of a secondary rev limiter set at whatever you want. 4500rpms or whatever you decide is best. Go somewhere and just practice until you get the just right launch then practice pedal control.


-Destin

 

Apneablue, I just looked at the pics of your car. Looks very nice.

-Destin

 

You know, I think i'm just not used to this setup just yet. When i had the twins putting down 317rwhp and running stock tires I would launch great and hook it well on those skinny 225...I probably...Not probably...I am just "mashing" on the gas...Guess i just need to drive her more...But I am going to invest in some better tires when these ware out.

Well, one thing is that I don't drag race...and if I do it's probably just 2 runs at the track...If 32psi is too much, what would you recommend as optimum? The clutch i have is the RP Bonez street / comp clutch...Not even sure what it's rated for...they just sold it to me when I did some maintenance work at RP when I was a total NOOBE. So i figure it's better than stock but not sure how much better...The axle and diff are stock and will stay that way till I break them. I drive the car very seldom but hope to change that pretty soon.

 

Your clutch is the lower limit to hold the power you are making, baby it if you want it to last. Carl

 

Better tires, that's what you need. I have around 450rwhp and with SO3's can hold in any gear on warm days.

 

On my low boost setting of 12lbs, 1st and 2nd are tire spin. I'm running stock sized tires and stock suspention. I need to get some tire under it asap. CJ

 

thats how my fd was. for some reason my FC just holds so much better.. and i had 275s on the back of my fd... 225s on the back of my fc.

 

i have no wheelspin...then again, i have 335's out back

 

What the ___?! 335's on what size wheel? What are the biggest tires i can run on stock FD wheels ?????

 

245/45R16's is the biggest you can run. 335's usally require 11-12" wide rims.

 

18x13"....although i don't recommend going that big, they have been a nightmare to eliminate rubbing the fenderwells.

 

Apnea the Bonez SS will hold your HP just fine. I ran the same and it held till the last rebuild of 410rwhp. I run Falken Azenis and hook up well on the street. I'm in a FC though with 500+ lbs of stereo over the rear end. A Kazz will help in a straight line, hurt in the turns.

 

I'm thinking you forgot to tell us what flare/wide body you have or maybe just forgot the smiley. I have 335s on my 18x12s with the pettit flares. With stock suspension i can break them loose in 1st and a little in 2nd on a regular day. But my camber was off so that might of effected a few things.

 

Thanks for the info on the clutch....When it was installed I didn't even ask RP what it would hold...Didn't care at the time....Now I kinda do..I remember calling and asking once and they said it's the same clutch they use in their drag car...that one with the American flag design all over it....Anyway, I had a feeling they were blowing smoke up my ***.

 

285/30-18 pirelli pzero corsa's. 60 treadwear. hookup awesome and handle great as well. much better than using drag radials for all around performance.

also, dunlop has the new super sport race in our sizes for really cheap last i checked. 60 treadwear also.

mike

 

Well I am running a 60-1 BB single setup, stock ported motor, 352rwhp@12psi, full TEIN suspension, 285-30-18 S02's on back, 4.77 gears, and I have ZERO traction in first, second, and alot of third....unless I run from a roll, then from a roll, top of 2nd is ok, and 3rd still spins going into it...but not for very long.

But racing from a dig is a no-no for me....the tires don't help much, the unsprung clutch doesn't help much, and I know my gears don't help at all.

 

285 potenza s03's with the t04s...it would break at the top of first but nothing else..