I just recently got the June issue and was reading the article on their tire setup on their 350z. They are running 275/35/18 all around w/ BBS FR18x9 and Rr18x9.5 and TCS turned off and have had great results.

Now I’m a bit confused.

As I have read if the car is equipped with a VDC, there has to be a slight difference in tire height, bias to the rear, or it will get screwed up. Won't the same thing happen with regardless if the TCS is turned off?

Any insights?

 

I assume you're talking about this article:
http://www.sportcompactcarweb.com/pr...t_2/index.html

1) It's not a standard everyday setup. They are going for handling as in an autocross or track car. Therefore then turn off TCS and would do the same to VDC if the car had that.

2) Most Zs with VDC will work fine with no stagger. Some are more sensitive than others and may throw the slip light during turns, etc. The thing that definitely freaks VDC out is when the fronts are taller than the rears. That's a definitely no-no.

My autocross setup is 265/35 all around. I drive to and from events on them as well as occasionally driving them for daily use. I have never had VDC kick in, even during spirited driving. I don't autocross with VDC on though as those violent moves will definitely cause it to activate.

 

Actually in the June article does not say they were 275/35s, it just says 275s, in the previous article that Dave posted a link to, they were using 275/40R18s all around.

One option if you what to keep the diameter difference but at the same time stay the same width, you could go with a 275/35 up front and a 275/40 out back.

Chris

 

My mistake, I double checked and it is 275/40/18 all around.

Chris- Arent you running the same series all around with you Kumhos? I remember reading one of your post on that setup.

Are you coming down again for the Z car show?

 

Is 275/35 (rear); 245/40 a bad setup, then?

 

Yes.

245/40 = 25.7" dia
275/35 = 25.6" dia

Front is 0.1" taller than rear.

 

Close, I had Kuhmos last year but was running 275/35 F and 275/40 R.

I'll be at the show sporting some Goodyear GS-D3s, see how the car goes on the autocross compared to the same size SPTs I was running last year.

Look me up maybe we can get in the dame run group again.

Chris

 

That 265/35-18, I assume?

 

That's exactly what i'm running.
VDC is fine, probably kicks in a little earlier than usual but not intrusive at all. I usually turn it off for hard squirts

 

Huh, I saw a car on here that looked great, but it was even worse 255/40 18x9.5; 275/35 18x10.5

 

Yes.

 

Huh?

 

A tenth of an inch is not going to affect the VDC at all, you need to get a difference of over .5" or more to see problems with the VDC.

 

No, you're thinking of the 0.25 to 0.75 recommended difference between the front and rear, i.e. the front being that much shorter than the rear.

He has the fronts taller than the rears. On some cars, the 0.1" difference may not cause problems, especially in straight line driving. On other cars it will cause problems. If you dig through this forum, there are a number of posts recently by people who have VDC issues and 99% of them are caused by have the fronts taller than the rears.

 

A Tenth of an inch is still not going to make a difference. The manufacture does not have the tolerances that close on the VDC. You can easily see a couple of tenths of an inch difference in tire wear from front to rear with the same size tires (rears wearing out quicker). The VDC is set up to account for this.

 

Here's a post by somebody having problems with VDC where the fronts are only 0.3" taller than the rear..

https://my350z.com/forum/wheels-and-tires/242867-new-owner-needs-help-with-slip-light.html

One of the things that I have observed over the years is that some cars behave differently than others regarding VDC. Some people have reported VDC issues with the same size all around. Some have reported issues even with a small stagger. This was especially true of the 03 and 04 models but I haven't noticed it as much recently. Possibly Nissan relaxed the tolerance on VDC and tire sizes or maybe people have just gotten smarter and stayed away from the close sizes.

The bottom line is that if you want to avoid TCS/VDC problems, stay away from F-R staggers of less than 0.25". Yes, you might get away with it but odds are you won't.

 

i love my base model Z, none of that electronic bs....but i am considering doing a 17" track setup with 275 all around. what offset would i need in order to achieve this?

 

What would you recommend for the rear. Right now I have 275 35 19 and 245 35 19's, but I want to upgrade. I would like to go 295 in the rear and 255 in the front, but I dont want to encounter any of the vdc problems. Thanx

 

^ I wanted to do the same, but there were no 295/30 for T1-R tires so I grabbed 285/35 (really needs to be 30 I think) and rolled the fenders a tiny bit.

 

So you think 295 30 19 rear and 255 35 19 front will work, without vdc issues?