Tires sizes and vcd

TBOX · 06-02-2011, 11:28 PM

I've ran the numbers thru the calculator to verify my speedo won't be too drastically off. But will 245 35 20 and 305 25 20 cause any problems?

I purchased the 305s for my rear but I'll replace fronts as well if I need to get a better size.

cossie1600 · 06-02-2011, 11:41 PM

not sure how the computer would like the extreme stagger.

TBOX · 06-02-2011, 11:46 PM

I'm thinking more diameters throwing it off. I haven't heard of anything that's effected by tire stagger.

TBOX · 06-03-2011, 12:29 AM

I guess the better question is, does anyone know what the tolerance is for the vdc for wheel ratios.
Stock is 1.01 this setup is 1.028

TBOX · 06-03-2011, 12:03 PM

Well I guess I'll find out, the 305's are getting put on right now. If they look goofy compared to the front or the car acts up I'll just have to get 255 30 20's for the fronts.

cossie1600 · 06-03-2011, 12:20 PM

you have more grip in the rear than front, there is a good chance the vdc will keep kicking on in the middle of the turn, but then you can always hit the off button

ChrisSlicks · 06-03-2011, 12:26 PM

Normally you want to keep the diameters within 2% to keep VDC happy, see how it goes.

245 vs 305 is twice the recommended stagger, expect substantial understeer.

TBOX · 06-03-2011, 12:30 PM

I'm not concerned with understeer at the moment. I'm dropping from 315 to 305.

TBOX · 06-03-2011, 12:33 PM

So what do you think would be the ideal setup for the front? 255 30 20 or 265 30 20? I'd try something even wider but I've got an 18et offset and I'm worried about rub at that point.

cossie1600 · 06-03-2011, 12:39 PM

chances are that with the crappy tire (not sure of many quality street tire in that size unless you have an exotic), the stagger wont do much with the vdc

TBOX · 06-03-2011, 12:42 PM

Quote:

Originally Posted by cossie1600

chances are that with the crappy tire (not sure of many quality street tire in that size unless you have an exotic), the stagger wont do much with the vdc

I'm not understanding what you're saying. Can you reword this?

cossie1600 · 06-03-2011, 01:07 PM

VDC doesn't like grippy tires. I am assuming you are running an average tire given the size, so you might get lucky and be able to avoid it.

Sorry was typing on a phone

TBOX · 06-03-2011, 01:31 PM

Quote:

Originally Posted by cossie1600

VDC doesn't like grippy tires. I am assuming you are running an average tire given the size, so you might get lucky and be able to avoid it.

Sorry was typing on a phone

Got it

Well ran into a bigger problem. The shop can't get my car on any of their lifts... It's only lowered like an inch but they are saying the HKS exhaust flanges scrape when they go to drive it up on the alignment rack.

So I either have the raise the car or find someone smart enough to jack the car up and then slide the arms under.

ChrisSlicks · 06-03-2011, 01:44 PM

Quote:

Originally Posted by TBOX

Got it

Well ran into a bigger problem. The shop can't get my car on any of their lifts... It's only lowered like an inch but they are saying the HKS exhaust flanges scrape when they go to drive it up on the alignment rack.

So I either have the raise the car or find someone smart enough to jack the car up and then slide the arms under.

Wait ... are they doing an alignment or just a tire change?

TBOX · 06-03-2011, 02:11 PM

Quote:

Originally Posted by ChrisSlicks

Wait ... are they doing an alignment or just a tire change?

They were doing both... The accomplished neither.

06-02-2011, 11:28 PM	#1 (permalink)
TBOX Enthusiast Member Join Date: May 2009 Location: Upstate New York Posts: 356 Drives: 09 370z MB M6 Rep Power: 16	Tires sizes and vcd I've ran the numbers thru the calculator to verify my speedo won't be too drastically off. But will 245 35 20 and 305 25 20 cause any problems? I purchased the 305s for my rear but I'll replace fronts as well if I need to get a better size.

06-03-2011, 12:26 PM	#7 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	Normally you want to keep the diameters within 2% to keep VDC happy, see how it goes. 245 vs 305 is twice the recommended stagger, expect substantial understeer. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

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06-02-2011, 11:41 PM	#2 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	not sure how the computer would like the extreme stagger.

06-02-2011, 11:46 PM	#3 (permalink)
TBOX Enthusiast Member Join Date: May 2009 Location: Upstate New York Posts: 356 Drives: 09 370z MB M6 Rep Power: 16	I'm thinking more diameters throwing it off. I haven't heard of anything that's effected by tire stagger.

06-03-2011, 12:29 AM	#4 (permalink)
TBOX Enthusiast Member Join Date: May 2009 Location: Upstate New York Posts: 356 Drives: 09 370z MB M6 Rep Power: 16	I guess the better question is, does anyone know what the tolerance is for the vdc for wheel ratios. Stock is 1.01 this setup is 1.028

06-03-2011, 12:03 PM	#5 (permalink)
TBOX Enthusiast Member Join Date: May 2009 Location: Upstate New York Posts: 356 Drives: 09 370z MB M6 Rep Power: 16	Well I guess I'll find out, the 305's are getting put on right now. If they look goofy compared to the front or the car acts up I'll just have to get 255 30 20's for the fronts.

06-03-2011, 12:20 PM	#6 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	you have more grip in the rear than front, there is a good chance the vdc will keep kicking on in the middle of the turn, but then you can always hit the off button

06-03-2011, 12:30 PM	#8 (permalink)
TBOX Enthusiast Member Join Date: May 2009 Location: Upstate New York Posts: 356 Drives: 09 370z MB M6 Rep Power: 16	I'm not concerned with understeer at the moment. I'm dropping from 315 to 305.

06-03-2011, 12:33 PM	#9 (permalink)
TBOX Enthusiast Member Join Date: May 2009 Location: Upstate New York Posts: 356 Drives: 09 370z MB M6 Rep Power: 16	So what do you think would be the ideal setup for the front? 255 30 20 or 265 30 20? I'd try something even wider but I've got an 18et offset and I'm worried about rub at that point.

06-03-2011, 12:39 PM	#10 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	chances are that with the crappy tire (not sure of many quality street tire in that size unless you have an exotic), the stagger wont do much with the vdc

06-03-2011, 01:07 PM	#12 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	VDC doesn't like grippy tires. I am assuming you are running an average tire given the size, so you might get lucky and be able to avoid it. Sorry was typing on a phone