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Old 12-11-2014, 12:44 PM   #1
Chrispy
 
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Drag Radial question

Hi folks,

I have DR's mounted on 09 front Z06 wheels (black) that I used on my old CTS V.

Problem is they are 305/35/18 and not the stock height 305/45/18.

Will I be able to run these at the strip without having ABS issues etc with the stock fronts? I'm guessing I'm going to have issues but would like to confirm with you guys...

If there are issues I'm likely going to sell this combo and get the new ZL1 style reproductions in 18 when they come out and run 305/45/18.

My car is an automatic.

Thanks in advance,
Chris
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Old 12-11-2014, 03:33 PM   #2
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When you run dramatically different sized tires front and back on the ZL1 it will give a stabilitrac warning and a power steering warning in the DIC after the car hits about 20 mph. After it shows the warning I think it says stabilitrac error, stabilitrac disabled. It does not matter what position you put the PTM in, it gives the warning everytime you restart the car and get a little speed on the tires. It does not cut engine power at all. Sometimes I drag race on different sized tires and since I don't get up to speed in the staging lanes I usually see all the warning on the run. It doesn't affect the time at all if you can ignore it.
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Old 12-11-2014, 03:34 PM   #3
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I believe the stock height is 305/35/20 because I have 305/45/18 drag radials and they are almost identical in height.
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Old 12-11-2014, 03:50 PM   #4
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When I checked with GM, their answer was no more than 3% difference.
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Old 12-11-2014, 04:06 PM   #5
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Quote:
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When I checked with GM, their answer was no more than 3% difference.
That's probably the right answer if you don't want to see the warning on the dash. But my point is after the warning pops up it doesn't shut down anything except stabilitrac and if you are racing you probably don't need stabilitrac. OP should be able to run the tires fine. If really concerned find the exact tire height and get a set of fronts that are within and inch of the same size. It is only when I go more than 2" differences I see the warning. For me it is easier to change tire size than gear ratio. The engine and drivetrain still run fine if you mismatch the tires front to back.
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Old 12-11-2014, 04:25 PM   #6
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Thanks guys...

Jessrayo - Any impact to A6 WOT shifting rpm?

Cheers
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Old 12-11-2014, 04:29 PM   #7
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My wife runs the 305/45R18 Mickey Thompson drag radials with stock fronts at the track on her ZL1 and has no ABS or stabilitrac warnings or issues
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Old 12-11-2014, 04:40 PM   #8
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Originally Posted by CanadianZL1#992 View Post
My wife runs the 305/45R18 Mickey Thompson drag radials with stock fronts at the track on her ZL1 and has no ABS or stabilitrac warnings or issues
Yup I know the 305/45's are good to go. (Same height as stock)

My old CTS-V setup is 305/35/18 though...they are shorter...
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Old 12-11-2014, 05:07 PM   #9
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Thanks guys...

Jessrayo - Any impact to A6 WOT shifting rpm?

Cheers
Chris
I have a manual so I can't speak for sure about the auto but I'm guessing it will shift fine. They will bolt right on, if it was me I would mount them up and test drive it a little. I suspect after you get the initial warning message and clear it you will have no traction control but everything else will run fine. Worst case, get a matched set of fronts and it will not show any warnings at all.
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Old 12-11-2014, 05:09 PM   #10
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Quote:
Originally Posted by Chrispy View Post
Yup I know the 305/45's are good to go. (Same height as stock)

My old CTS-V setup is 305/35/18 though...they are shorter...
Sorry thought it was a typo. I didn't know they made a 305/35R18
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Old 12-11-2014, 05:45 PM   #11
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You won't have any problems I drag race with 305/35r18 MT ET streets ll and I have never had any problems
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Old 12-12-2014, 01:37 AM   #12
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I just bought 325/40/18 M&H RaceMaster Drag Radials which are the same stock height nealy & will be trying them soon.

Ahmad
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Old 12-12-2014, 07:39 AM   #13
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305/35-18s work fine. The stabilitrak warning does illuminate at first. After a short period of time this warning goes away. No worries...I have at least 50-75 runs on these tires with no issues. I turn all nannies off for runs.
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Old 12-12-2014, 09:14 AM   #14
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Thanks Stephen - What exactly do you do for your runs with the traction control? (What button press combo)

Cheers
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Old 12-12-2014, 09:38 AM   #15
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Quote:
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Thanks Stephen - What exactly do you do for your runs with the traction control? (What button press combo)

Cheers
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I would turn the traction control all the way off hold down on the traction control for about 7 sec and it will turn off completely. I don't run in any ptm mode ...I turn everything off...
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Old 12-12-2014, 10:20 AM   #16
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Perfect thanks...that's how I did it in my V. (Stabilitrack and TC fully off)
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Old 12-13-2014, 09:59 AM   #17
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Thanks Stephen - What exactly do you do for your runs with the traction control? (What button press combo)

Cheers
Chris
MO and I do the same thing. Traction control button held down for 7seconds to turn everything off. The only thing any of the other traction control settings will do is slow you down.
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#917 A6. 10.52@131.6 1.55 60' (608/620) 2:13 VIR full. ADM race CAI, ATI/Lingenfelter balancer (10" ring), 90mm TB, ID850s,Rotofab/Lingenfelter intercooler reservoir, Cooler Logic HX, Texas Speed 1 7/8" headers(no cats). M/T 305/35-18 drag radials & M&H 28x4.5" bias skinnies. Toyo Proxes R888 285/35-20, Hawk DTC 70/60, 8.66" ring (508/540). Tuning by Frost at Performance Autosport in Richmond, VA (804) 358-2505
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