Traction issues

Post by **sepulchralx** » Mon Apr 20, 2009 5:10 am

Car is putting down 440hp and just shy of 400tq, i'm having bad traction issues in my s14.. At the top of 2nd and 3rd is when the car breaks loose bad. Pretty scary.

My tires are 275/40-R17's and the rear camber is -1.5 degrees which should be fine

I do not have LSD yet, and i want to get a decent lsd just to put the power down - i don't plan on drifting the car so I dont need anything fancy schmancy...

My questions are: is a 180sx VLSD sufficient and reliable for this power? and do you think 275's are big enough tires for this kind of power (or should i go widebody and get some 305s?)

Also if i planned on getting an s15 LSD with output shafts, what would I need to get it to fit in my s14 pumpkin?

Post by **SullivanRacing06** » Mon Apr 20, 2009 5:16 am

use a normal vlsd, i made 500 plus on mine for a few months, then i switched to a kaaz, i had 275/35/18 on the rear, had traction problems, switched to a corsa 305/30/18 with a 60 treadwear, hooks allot better,

Post by **sepulchralx** » Mon Apr 20, 2009 5:20 am

SullivanRacing06 wrote:use a normal vlsd, i made 500 plus on mine for a few months, then i switched to a kaaz, i had 275/35/18 on the rear, had traction problems, switched to a corsa 305/30/18 with a 60 treadwear, hooks allot better,

Why did you switch to the KAAZ? You think my 275s are alright?

Post by **Carl H** » Mon Apr 20, 2009 5:45 am

just get an lsd and decent suspension...then see if you have traction problems.

Post by **Darius** » Mon Apr 20, 2009 5:58 am

If you are still running the same camber and ride height in the pic you sent me about two months ago, it is not -1.5*. It is more like -5.5*. Stretched tires do not have any sidewall flex and, therefore, limit traction as well. And coilovers are not going to give you good straight line traction due to their stiffness. Hence, why guys use the stock suspension for drag racing.

There are 3 things against your car hooking up. You can at least fix 2 of those. The suspension is something you'll have to decide on based on the use of the car and the look you want to maintain with it.

Post by **SullivanRacing06** » Mon Apr 20, 2009 6:01 am

sepulchralx wrote:
Why did you switch to the KAAZ? You think my 275s are alright?

the biggest problem i had was the rear of my car being to low, in return to much neg camber, lift it so you have under -.5 deg itll hook a hell of allot better, more tire on the ground, the kaaz helped, i messed up a few r200s with the mts so i said screw it and dished out the money for the kaaz, youll feel a diff if you have less camber, trust me i know!

Post by **sepulchralx** » Mon Apr 20, 2009 6:30 am

Darius wrote:
If you are still running the same camber and ride height in the pic you sent me about two months ago, it is not -1.5*. It is more like -5.5*. Stretched tires do not have any sidewall flex and, therefore, limit traction as well. And coilovers are not going to give you good straight line traction due to their stiffness. Hence, why guys use the stock suspension for drag racing.

There are 3 things against your car hooking up. You can at least fix 2 of those. The suspension is something you'll have to decide on based on the use of the car and the look you want to maintain with it.

I got an alignment last friday, now its -1.5 deg and i raised the car a bit to be able to put 275's on there. The wheels are virtually straight up and down now... no new pics

I have coilovers, does stiffening them worsen traction?

Post by **Darius** » Mon Apr 20, 2009 6:52 am

Ok good deal. The softer you set the coilovers, the better off you'll be. The main problem is that you're stuck with the same stiff spring rate, which is the main factor.

275s will still spin on a 400whp setup unless they're drag radials. I had 265s last summer and they were a decent street tire, but still spun when I got into boost. Now I have MT DRs and they hook pretty good so far. Not sure how long they'll last though; they're pretty soft

What kind of tires do you have on the rear?

Post by **SullivanRacing06** » Mon Apr 20, 2009 7:06 am

when i race on the strip i soften the rear right side coilover nso the car squats easier on the pass side rear so it hooks a lil better, i run tein ss coils

Post by **sepulchralx** » Mon Apr 20, 2009 7:11 am

Darius wrote:Ok good deal. The softer you set the coilovers, the better off you'll be. The main problem is that you're stuck with the same stiff spring rate, which is the main factor.

275s will still spin on a 400whp setup unless they're drag radials. I had 265s last summer and they were a decent street tire, but still spun when I got into boost. Now I have MT DRs and they hook pretty good so far. Not sure how long they'll last though; they're pretty soft

What kind of tires do you have on the rear?

I'm running a khumo on one side and a goodyear on the other, both are good tread, I got the tires for $40 installed/mounted (including cost of tires) from some mexican/hispanic place near where I live.. they're used of course... Would lowering my tire pressure help a bunch? How much were your MT DRs?

Post by **SullivanRacing06** » Mon Apr 20, 2009 7:14 am

i run a 305/35/18 for the m/ts

Post by **sepulchralx** » Mon Apr 20, 2009 7:26 am

SullivanRacing06 wrote:i run a 305/35/18 for the m/ts

widebody?

Post by **SullivanRacing06** » Mon Apr 20, 2009 7:41 am

hell no! im not gonna molest my 240 like that! that crap looks stupid (in my opinion) i just raised the rear of the car so theyd fit

Post by **sepulchralx** » Mon Apr 20, 2009 8:42 am

pics? how wide are your rears?

Post by **bades** » Mon Apr 20, 2009 5:02 pm

heck man i have an rb20det in an s13 wit an r33 diff and i have 275 40r 17s and i spin all of 1 bottom of 2nd and chirp 3rd and i run a gforce on the rear.... the swap is stock wit boost at 12psi a fmic and turbnop back 3in catless exhaust...

Post by **Shocker** » Mon Apr 20, 2009 6:38 pm

TIRES TIRES TIRES!

Its all in the tires. I used to have traction issues stock RB power, car would spin through 2nd on most roads..

Last year running RE-01's the car still spun.

This year running an MT ET street making around 400ish for the 2 weeks it ran... The car hooked VERY well. Spun 1st just a bit when tires were cold, the rest was pure hook.

Car is sitting on megan racing coil overs, camber set to -.4 degrees. Nice fat contact patch. 275/40/17's. 4.08 rear end. I was very happy with the tire, I would recommend it as well. Soft compounds are your best bet, however they will need replaced more often as they wear a lot quicker.

Oh yeah, if your tires "chirp" they are hard..

Post by **gawdzilla** » Tue Apr 21, 2009 5:01 am

yup, it's all about the tire compound. width doesnt mean much if the compound sucks

Post by **lucky7** » Tue Apr 21, 2009 7:11 am

lol, i STILL have my 225 RE070's on the back of mine. hahaha. i drove it last week for the first time in 6 months, and almost shat myself. rofl.

anyhow, im just waiting for my tax returns to come back so i can get some new rollers and rubber. i found some 18x10.5 +15 RPF1's on zilvia with 265's on them. i can deal with less tire spin than i have. when these tires go, i can go wider. otherwise im looking at some 18x10 +24 VSXX's without tires. hmmmm.

anyhow, i have a 25 with a 3076r @ 15psi.

Post by **Sil240** » Tue Apr 21, 2009 9:52 am

Quick question for you guys.I'm looking to put down about 375hp on a RB20 just to cruise on the weekends.

But..... I have 225/45/R18 BFG G-force Sports.I def expect some wheel spin, but it should be manageable.

I don't plan on blasting around everywhere.

Also the wheels/tire combo is about 40lbs on each corner.

Post by **lucky7** » Tue Apr 21, 2009 10:05 am

what is the question?

Post by **sepulchralx** » Tue Apr 21, 2009 2:04 pm

Well, I went to the junk yard and pulled a 1995/1996 J30 LSD off (this year has 6-bolt output shafts). The place only charged me a standard $25 for "gears" for the whole lsd. I threw some lucas oil 75w-90 in it after draining the pumpkin, and it bolted up just like heaven to my s14.

$25LSD, $20 for gear oil = awesome and so satisfying...

Now its raining like a b**** outside and i really want to see what its like!! I'll let you all know.

Anyways in the mean time, if i plan on dropping tire pressure to gain a bit of traction with the tires I have now, what is the minimum pressure I SHOULD have in my tires? Right now they're at 33psig......... I'm thinking drop to 25psig. TY

Post by **Sil240** » Wed Apr 22, 2009 5:46 am

lucky7 wrote:what is the question?

Yeah... hahaha the question would of been nice.

You guys think I'd be ok with that setup?

Post by **240z4u** » Wed Apr 22, 2009 5:49 am

Sil240 wrote:
Yeah... hahaha the question would of been nice.

You guys think I'd be ok with that setup?

Your tires will take one look at your dyno charts and ram you into every stationary object they can point the car at when you stomp on the gas.

No, 225s won't cut it.

Evan

Post by **Sil240** » Wed Apr 22, 2009 6:42 am

Gotcha, thats what I expected.

Been trying to sell them 4ever, but no bites. :-(I have some Z32 wheels on it right now.I'm thinking to put some Azenis 615's on it till I can get these other wheels sorted.

Post by **lucky7** » Wed Apr 22, 2009 9:01 am

my rears are bald at this point, but i dont want to buy new tires for the wheels i have. i would like to just bite the bullet and go wider.

Post by **240z4u** » Wed Apr 22, 2009 9:09 am

Put some drag radials on the rear and go have fun then!

Post by **sepulchralx** » Wed Apr 22, 2009 11:09 am

Ok the lsd didn't help... i guess i need to drop tire pressure now.

Post by **SullivanRacing06** » Thu Apr 23, 2009 7:42 am

with over 375 400 whp youll need a softer compound on any s body, i had toyo tr1 275/35/18 in the rear at a 270 treadwear, then i switched to a corsa at a 60 treadwear and a bit wider, that made all the difference, dont get me wrong my tires still spin at what ever speed im doing but they def helped out, they grab just as well as a skinnier set of mts did

Traction issues

Traction issues

Re: Traction issues (sepulchralx)

Re: Traction issues (SullivanRacing06)

Re: Traction issues (sepulchralx)

Re: (Darius)

Re: (sepulchralx)

Re: (Darius)

Re: (Darius)

Re: (sepulchralx)

Re: (SullivanRacing06)

Re: (sepulchralx)

Re: (SullivanRacing06)

Re: (bades)

Traction

Re: (lucky7)

Re: (Sil240)

Re: (Sil240)

Re: (lucky7)

Re: (240z4u)

Re: (sepulchralx)

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