Hey I've got a question for you guys on the boost whether s/c or TT.

What is the hp rating of your car and whats the rim size and tire you are running and how is the tractoin with your combo be it at the track or street???

From what ive read it sounds like all of you are having big traction issues..?

I will be installing some kind of F/I this upcomming winter and am holding off on the rims and tires as maybe the way to go is the veilside overfender kit with 335's in the back.

Actually does anybody have the veilside kit or know how big of a tire you can run with it?

Thanks this info will be much appreciated!

 

Another question: would 9.5"/10.5" tires in the front/back be worth it (as opposed to 8.5"/9.5") if one was making around 400-410 rwhp?

 

I am running 275/40-18s in the back and I have alot of traction issues. The biggest problem that I see is with the rear suspension itself. I have very bad negative camber in the back so only the inner 30% or so of the tire is getting good contact. My car is not lowered either. I am not certain that it can be fixed either without creating an even worse toe-in condition. I really have to wonder how Nissan could have let so many issues with the suspension make it into production.

 

Thats strange that you are having camber issues do you have the same effective diameter as the stock wheel/tire?

Shouldnt an independant rear suspension lay flat no matter what and also be able to adjust the camber easily??? I mean isnt that why the independant suspensions exist...to always provide each tire with flat contact?

Anybody having the same problems?

 

Take a look at any rear wheel drive sports car, and almost all of them have negative rear camber...this is just how they are designed. The factory specs of the Z call for negative camber between .5 and 2.0...I think..I cant remember the exact numbers but there is definately negative camber dialed in from the factory.

Most folks...including myself...are running 275's in the rear. If you have stock runs and tires, get ready for some serious traction issues. With 275's, it really depends on the type of launch you do. The power can be modulated to get a clean fast start...it just takes some practice. With this much power and particularly...torque...down lown in the power band, this will be an issue regardless of what tire/wheel combo you have. But this would be the case with any high performance rear wheel drive car. The 275's help...but its still possible to break taction. I can't even begin to image what it would be like if I had stock rims and tires.

Even with the traction issues, some guys are running mid to low 12's on street tires.

 

As many people who attended Z Attack IV in Nashville can now attest, I can easily spin my 275/40/18s through 4th gear and starting into 5th. Of course, that is the extreme when one is trying to show off!

It's very tough to get a good launch tho (I'm pushing 420hp to the wheels). I'm learning to "feather" into 1st gear, but I still get a little spin even when doing this is 1st & 2nd gears. I've done no suspension work and think that would help a lot. I've looked at going with wider rubber, but I don't think that would help as much as going from street to competition tires of some sort.

The tire spin does not bother me greatly since I don't tend to drag race much. I prefer highway (rolling) launches and twisty road driving. In both of those cases, I'm already moving so wheel spin is not much a problem.

 

Mcduck, Gq Model you, are both running 275's on the rear which is the biggest you car run with the stock fenders correct?

With the veil side you can run a 13" rim max width which i think is a 335 or 355 max width tire. If you had these tires on your cars what do you think would happen to your 1/4 mile times and launches?

The boulder nissan car which dynoed at 507 rwhp last i heard is running 275's right now and they are going with the veilside overfender/widebody kit as they say the traction is just non existant. like driving on ice.

now about the camber i know the car runs negative camber as of course in a corner this would creat more traction as the g force starts to push the top of the wheel/tire outwards thus creating
a more straight up and down wheel/tire when negative camber is used however .... Teh215 is claiming 30% contact on a flat launch ...that is useless and something has to be really wrong there are either of you guys havinjg the same problem...its the first ive seen on this forum.

 

im running 275/30s on 19s and i can spin them but its pretty difficult, they are pilot sports so they grip like crazy, i had camber issues but corrected it with camber arms,

 

Camber arms??? you cant just adjust the camber on the factory suspension???

please eloborate (what are camber arms) its sounding like camber issues are common with after market rims?

how do you think your car might be like with a set of 335's in the rear?

 

SQUILL...

I'm running 275/40/18s on the back.

I have been told with correct offsets, you can stuff an 11" rim under the back of the 350Z. With that, I believe your max rubber width is 315 with a 30 profile for either 18" or 19" rims.

Where are you looking at the Veilside widebody kit? And are there any pics of Z with that kit installed already?

 

Mcduck the veilside wide body kit is just the sweetest bodykit ever!!!! check it out
http://www.i-m-racing.com/veovkit35.html
also on this forum check out https://my350z.com/gallery/albup39 its the same car i think.
one more this guy spent all the $$$ and had the kit smothed into the car probably with bondo and a complete custom paint job http://www.cardomain.com/memberpage/465703

 

eh the veilside is overused by the show cars. not to mention that its veilside so its build quality sucks, eggshell thin fiberglass is not good for a daily driver

 

I havent heard bad things about quality with veilside but i was more interested in being able to run masive tires in the back!

 

I am running 245s for about the next month until I have my 275 installed.


Traction? What is this "Traction" you speak of? I can't seem to find it when I am in any of my gears. My car permanently blinks "SLIP","SLIP","SLIP".

 

Yea Bini thats what im saying maybe a set of 335's is what you need while boosting!

 

I hate the look of widebody kits..in my opinion. I totally detracts from the sexy shape of the Z. Also, there are several members running 285 and 295 rear rubber, with pretty aggressive offsets...sub20....and rolling of fenders. I would much rather go that route. Again..traction is not an issue 90% of the time...so I wouldnt buy a body kit JUST to put bigger tires on your car. Now, if you like the look of widebody kits, then go for it.

 

Yea Gq u r right about the widebody kit plus its like 5-6k painted and installed.

I was at Boulder Nissan Today checking out their Greddy TT car and they said you can get a 295 in the rear with the correct offset quite easily.

You Guys Running Twin Turbos are the $hit!!! After seing the TT car in person ...Wow it is just sooo bad ***!!! props to you guys i will be joining your ranks this winter either the greddy kit or the new aps kit!!!!

 

Well, I will say, if you are not adding weight to the equation, the advantage of having wider tires can start to diminish, without putting softer compound tires on the car. You would want to worry about the compound of the tires before you worry about the width when you are already talking about 275s.