Differance in size before the lights come on

Rusty · 09-16-2014, 07:10 PM

Searched, but didn't find what I was looking for. Question is how much differance can you have between the front tire and rear tire in diameter before it affects the computer? Reason is, I have to order new rear tires. I corded them at my last trackday. The front tires are 275/35-19, 26.6" in diameter, and they are still good. The old 325/30-19's are 26.7" in diameter. Wondering if I could go to 345/30-19, 27.2" diameter without the lights coming on.

cooltoy · 09-17-2014, 10:40 AM

Ken would know. In one of the threads he told me, but I can not recall. It could be something like 1%.

FPenvy · 09-17-2014, 10:47 AM

Quote:

Originally Posted by Rusty

Searched, but didn't find what I was looking for. Question is how much differance can you have between the front tire and rear tire in diameter before it affects the computer? Reason is, I have to order new rear tires. I corded them at my last trackday. The front tires are 275/35-19, 26.6" in diameter, and they are still good. The old 325/30-19's are 26.7" in diameter. Wondering if I could go to 345/30-19, 27.2" diameter without the lights coming on.

whenever i was buying my newest set of tires someone mentioned the acutal amount of difference where it messes up the ECU but for the life of me i cant remember.

i'm running 265/35/19 and 305/30/19 RE-11's and have no light. not sure of the specs of their diameters at the moment.

TreeSemdyZee · 09-17-2014, 11:54 AM

Man. I REALLY didn't know where to go with that title.

cooltoy · 09-17-2014, 01:06 PM

69% of the people find something dirty in every sentence.

Waiz · 09-17-2014, 04:08 PM

To keep TCS happy I would keep a stagger of at least .5" to a max of 1"

Rusty · 09-17-2014, 04:16 PM

I'm looking at a .6" for what I want to do.

cooltoy · 09-17-2014, 04:17 PM

Must be 1", not 1%. I had a number 1 in my head. Looks like you should be OK at 0.6.

Waiz · 09-17-2014, 05:00 PM

It's tough to really get concrete info but in my experience if you maintain at least 1% to 3% you won't run into issues

The .5" to 1" guidance is what we have been suggesting to people for years on my350z without issue

I also use this tire calculator whenever I am asked too:

http://www.miata.net/garage/tirecalc.html

cooltoy · 09-17-2014, 05:16 PM

Waiz is the man too listen to.

kenchan · 09-18-2014, 09:15 AM

Quote:

Originally Posted by cooltoy

Ken would know. In one of the threads he told me, but I can not recall. It could be something like 1%.

me?

the 350Z/G35C dynamic control system is rudimentary in comparison to the 370Z's system.

i think if you're within 3% you're fine. i dont have scientific data on this though.

cooltoy · 09-18-2014, 09:44 AM

I thought it was you who told me, it might have been Waiz. Sorry for throwing up the bat signal.

kenchan · 09-18-2014, 11:09 AM

Quote:

Originally Posted by cooltoy

I thought it was you who told me, it might have been Waiz. Sorry for throwing up the bat signal.

bat signal?

cooltoy · 09-18-2014, 11:54 AM

Almost missed the winking smiley. First I was like "Ken

" then I saw it and I was like" me

".

Waiz · 09-18-2014, 12:18 PM

Quote:

Originally Posted by kenchan

me?

the 350Z/G35C dynamic control system is rudimentary in comparison to the 370Z's system.

i think if you're within 3% you're fine. i dont have scientific data on this though.

Even for as long as the Z33 has been out we don't have concrete info

Damn Nissan and it's over complicated systems!

09-16-2014, 07:10 PM	#1 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,863 Drives: 2011 Nismo GM 6M Rep Power: 2684436	Differance in size before the lights come on Searched, but didn't find what I was looking for. Question is how much differance can you have between the front tire and rear tire in diameter before it affects the computer? Reason is, I have to order new rear tires. I corded them at my last trackday. The front tires are 275/35-19, 26.6" in diameter, and they are still good. The old 325/30-19's are 26.7" in diameter. Wondering if I could go to 345/30-19, 27.2" diameter without the lights coming on. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html Last edited by Rusty; 09-16-2014 at 11:20 PM.

09-17-2014, 10:40 AM	#2 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,938 Drives: 14 PW 370Z S/T MT Rep Power: 240204	Ken would know. In one of the threads he told me, but I can not recall. It could be something like 1%. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

09-17-2014, 11:54 AM	#4 (permalink)
TreeSemdyZee Premium Member Join Date: Dec 2009 Location: Kentuck-IANA Age: 59 Posts: 4,880 Drives: '09 370 & ‘14 Juke Rep Power: 27408	Man. I REALLY didn't know where to go with that title. KaienZ34, SouthArk370Z and Rusty like this.

09-17-2014, 01:06 PM	#5 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,938 Drives: 14 PW 370Z S/T MT Rep Power: 240204	69% of the people find something dirty in every sentence. KaienZ34, TreeSemdyZee, JARblue and 2 others like this. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

09-17-2014, 04:16 PM	#7 (permalink)
Rusty Ronin Samurai - Assassin Join Date: Dec 2011 Location: Fayettenam,Pennsyltucky Age: 68 Posts: 34,863 Drives: 2011 Nismo GM 6M Rep Power: 2684436	I'm looking at a .6" for what I want to do. __________________ 浪人 - 殺し屋 "The Difficult Anytime, The Impossible By Appointment Only" http://www.the370z.com/members-370z-...o-journal.html

09-17-2014, 04:08 PM	#6 (permalink)
Waiz A True Z Fanatic Join Date: Apr 2010 Location: SoCal Posts: 9,262 Drives: Z33 & GE8 Rep Power: 459	To keep TCS happy I would keep a stagger of at least .5" to a max of 1"

09-17-2014, 04:17 PM	#8 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,938 Drives: 14 PW 370Z S/T MT Rep Power: 240204	Must be 1", not 1%. I had a number 1 in my head. Looks like you should be OK at 0.6. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

09-17-2014, 05:00 PM	#9 (permalink)
Waiz A True Z Fanatic Join Date: Apr 2010 Location: SoCal Posts: 9,262 Drives: Z33 & GE8 Rep Power: 459	It's tough to really get concrete info but in my experience if you maintain at least 1% to 3% you won't run into issues The .5" to 1" guidance is what we have been suggesting to people for years on my350z without issue I also use this tire calculator whenever I am asked too: http://www.miata.net/garage/tirecalc.html Rusty likes this. Last edited by Waiz; 09-17-2014 at 06:30 PM.

09-17-2014, 05:16 PM	#10 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,938 Drives: 14 PW 370Z S/T MT Rep Power: 240204	Waiz is the man too listen to. Waiz likes this. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

09-18-2014, 09:44 AM	#12 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,938 Drives: 14 PW 370Z S/T MT Rep Power: 240204	I thought it was you who told me, it might have been Waiz. Sorry for throwing up the bat signal. __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

09-18-2014, 11:54 AM	#14 (permalink)
cooltoy Elite Member Join Date: Jun 2012 Location: Calgary Posts: 13,938 Drives: 14 PW 370Z S/T MT Rep Power: 240204	Almost missed the winking smiley. First I was like "Ken " then I saw it and I was like" me ". __________________ Member of kenchan's "photoshopped mods" and "proper offsets" gang.

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