Phunk's Guide To Huge Meat

Wuero370z · 08-08-2020, 10:06 AM

Quote:

Originally Posted by 1slow370

Copying this from the FI section into it's own thread.

Why do 28s send a Christmas tree and not 26s?

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phunk · 08-09-2020, 04:27 PM

Quote:

Originally Posted by Wuero370z

Why do 28s send a Christmas tree and not 26s?

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By virtue of being a 28 itself is what causes it. The diameter is too large. The wheel speed sensor system detects it via the decreased axle speed offset relative to the front axle, and it causes a fault. A simple, but not free, way around this would be to increase front tire rolling diameter by an equal proportion.

Rusty · 08-09-2020, 05:44 PM

If there is a 3% or more difference between any tire on the Z. The dash will light up.

Wuero370z · 08-09-2020, 07:53 PM

Quote:

Originally Posted by phunk

By virtue of being a 28 itself is what causes it. The diameter is too large. The wheel speed sensor system detects it via the decreased axle speed offset relative to the front axle, and it causes a fault. A simple, but not free, way around this would be to increase front tire rolling diameter by an equal proportion.

Ah makes good sense!
So how would I go about making sure the increases are proportional in both front and rear?
Do you go by overall tire diameter or does the wheel size have an effect as well?

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Rusty · 08-09-2020, 08:01 PM

Quote:

Originally Posted by Wuero370z

Ah makes good sense!
So how would I go about making sure the increases are proportional in both front and rear?
Do you go by overall tire diameter or does the wheel size have an effect as well?

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You have to go by tire height. What's the rear tire specs you want to go with? What do you have on the front now?

Wuero370z · 08-09-2020, 08:20 PM

Quote:

Originally Posted by Rusty

You have to go by tire height. What's the rear tire specs you want to go with? What do you have on the front now?

I would like to run a 28x10.5-15 non W as that’s the biggest tire most small tire races allow. I currently have nitto invos 285/35-19 in the front.

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Rusty · 08-09-2020, 08:56 PM

Quote:

Originally Posted by Wuero370z

I would like to run a 28x10.5-15 non W as that’s the biggest tire most small tire races allow. I currently have nitto invos 285/35-19 in the front.

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That's about 2.5" difference in height, or 9%. Sticking with a 19" rim. A 245/45-19 is about 27.7" in height, or 1.2%. A 255/45-19 is 28.1" or 0.3%. Both will work.

Wuero370z · 08-09-2020, 10:03 PM

Quote:

Originally Posted by Rusty

That's about 2.5" difference in height, or 9%. Sticking with a 19" rim. A 245/45-19 is about 27.7" in height, or 1.2%. A 255/45-19 is 28.1" or 0.3%. Both will work.

Thank you. Ideal rim size would be 9” wide or would that be able to fit on 8.5” and save a little weight?

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bpchaos · 08-11-2020, 03:43 PM

Quote:

Originally Posted by Wuero370z

I would like to run a 28x10.5-15 non W as that’s the biggest tire most small tire races allow. I currently have nitto invos 285/35-19 in the front.

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Alternatively, get a pair of the sport donut spare wheels, and run a set of 28inch skinnies in the front.

https://www.summitracing.com/parts/H...YaAnKLEALw_wcB

sirnixalot · 08-11-2020, 05:19 PM

Quote:

Originally Posted by bpchaos

Alternatively, get a pair of the sport donut spare wheels, and run a set of 28inch skinnies in the front.

https://www.summitracing.com/parts/H...YaAnKLEALw_wcB

M&H front runners
https://www.summitracing.com/int/parts/mnh-mss025

08-09-2020, 05:44 PM	#3 (permalink)
Rusty A True Z Fanatic Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 70 Posts: 35,571 Drives: 2011 Nismo GM 6M Rep Power: 2684440	If there is a 3% or more difference between any tire on the Z. The dash will light up. redondoaveb likes this. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

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