370z MEATY TIRE THREAD

[VinceThe1]

Originally Posted by nomodsjk

I have a question and please forgive me if it's all ready been answered on this thread but I just recently got 275/35/20's in the front and 315/35/20's in the rear and ever since my traction control light won't go off. I'm not sure why this is but I'm guessing it's because of the meats. Can someone please enlighten me. Thanks in advance.

The reason more than likely is because of your tire sizes. First, your rear tire is a whopping 8% (6.6") larger in circumference than original, but that's not the problem.

The problem is that you have a 4% (3.5") difference in circumference from front and rear tires, this would throw the VDC ecu off because your front and rear axles will be turning at different speeds without any steering angle.

Your front tires will be spinning faster than your rear on the axle, making the VDC ecu think there is wheelslip (although impossible due to the fact the Z is rwd and there's no way the fronts would be spinning faster than rears unless you're locking up the rears with the e-brake but that's beside the point, it still throws off the computer)

Three different ways to solve this:

1. Turn off your VDC everytime you start your car.
2. Replace rear tires with 325/30R20
3. Replace all tires with tires that are closer to factory diameters like 275/30R20 front and 325/25R20 in the back.

[FPenvy]

Originally Posted by VinceThe1

The reason more than likely is because of your tire sizes. First, your rear tire is a whopping 8% (6.6") larger in circumference than original, but that's not the problem.

The problem is that you have a 4% (3.5") difference in circumference from front and rear tires, this would throw the VDC ecu off because your front and rear axles will be turning at different speeds without any steering angle.

Your front tires will be spinning faster than your rear on the axle, making the VDC ecu think there is wheelslip (although impossible due to the fact the Z is rwd and there's no way the fronts would be spinning faster than rears unless you're locking up the rears with the e-brake but that's beside the point, it still throws off the computer)

Three different ways to solve this:

1. Turn off your VDC everytime you start your car.
2. Replace rear tires with 325/30R20
3. Replace all tires with tires that are closer to factory diameters like 275/30R20 front and 325/25R20 in the back.

good info

when i decided to go wider i checked many different options and brands to make sure i got close.

my set-up has identical circumferences F/R of 26.3"

265/35/19 F and 305/30/19 R

[Rusty]

I'm on the edge with my sizing. 275/35-19 (26.6") and 345/30-19 (27.2").

[FPenvy]

Originally Posted by Rusty

I'm on the edge with my sizing. 275/35-19 (26.6") and 345/30-19 (27.2").

but.........345s are worth the difference

[VinceThe1]

Originally Posted by Rusty

I'm on the edge with my sizing. 275/35-19 (26.6") and 345/30-19 (27.2").

You're only at a 2.1% difference, he has a 4% difference. There's the problem

Next time get 295/35R19s for the front and you'll be at 0.1% of a difference...then again those are really expencive and hard to come across, but 285/35R19s are everywhere and they're still closer than the 275 obviously, they're at a 1.1% difference from your 345

[Rusty]

Originally Posted by VinceThe1

You're only at a 2.1% difference, he has a 4% difference. There's the problem

Next time get 295/35R19s for the front and you'll be at 0.1% of a difference...then again those are really expencive and hard to come across, but 285/35R19s are everywhere and they're still closer than the 275 obviously, they're at a 1.1% difference from your 345

I might move up to the 285/35-19 when I need front tires, or go even bigger if I can $$$ for new front rims.