Drag Radial question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Chrispy · 12-11-2014, 11:44 AM

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

jessrayo · 12-11-2014, 02:33 PM

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.

CAM....ZL1 · 12-11-2014, 02:34 PM

I believe the stock height is 305/35/20 because I have 305/45/18 drag radials and they are almost identical in height.

brian-nicola · 12-11-2014, 02:50 PM

When I checked with GM, their answer was no more than 3% difference.

jessrayo · 12-11-2014, 03:06 PM

Quote:

Originally Posted by brian-nicola

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.

Chrispy · 12-11-2014, 03:25 PM

Thanks guys...

Jessrayo - Any impact to A6 WOT shifting rpm?

Cheers
Chris

CanadianZL1#992 · 12-11-2014, 03:29 PM

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

Chrispy · 12-11-2014, 03:40 PM

Quote:

Originally Posted by CanadianZL1#992

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...

jessrayo · 12-11-2014, 04:07 PM

Quote:

Originally Posted by Chrispy

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.

CanadianZL1#992 · 12-11-2014, 04:09 PM

Quote:

Originally Posted by Chrispy

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

MO'SZL1 · 12-11-2014, 04:45 PM

You won't have any problems I drag race with 305/35r18 MT ET streets ll and I have never had any problems

alssiri · 12-12-2014, 12:37 AM

I just bought 325/40/18 M&H RaceMaster Drag Radials which are the same stock height nealy & will be trying them soon.

Ahmad

Stephen12ZL1 · 12-12-2014, 06:39 AM

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.

Chrispy · 12-12-2014, 08:14 AM

Thanks Stephen - What exactly do you do for your runs with the traction control? (What button press combo)

Cheers
Chris

12-11-2014, 11:44 AM	#1
Chrispy 11.91 ET Bone stock Drives: 2015 Camaro ZL1 Join Date: Nov 2014 Location: Canada Posts: 353	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

12-11-2014, 02:33 PM	#2
jessrayo Speed Freak Drives: 2013 ZL1 Camaro, 2016 Camaro SS Join Date: Jun 2013 Location: Ardmore, OK Posts: 2,637 View My Garage	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. __________________ 2016 SS -AGP twin Borg Warner 7163 EFR's, LT4 mechanical pump, LT4 injectors, Walbro 255 low side, Castrol SRF. 734whp/759 tq 2013 ZL1 -ADM - 427 LSX 6 bolt, O-ringed block built by LME. Twin PT6466 turbos. RPM custom manual trans, RPS Quad carbon clutch, 9" Hendrix rear diff & axles. ADM/squash fuel system, Ron Davis radiator, Spal fans, AGP air to air, turbo plumbing. LPE oil cooler, rear bushing upgrade, roll bar...etc. rwhp 1400+... 212.5mph, best Texas mile to date.

12-11-2014, 03:29 PM	#7
CanadianZL1#992 ANGRY Z Drives: 2015 Camaro ZL1 Join Date: May 2012 Location: Alberta, Canada Posts: 1,406	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 __________________ 2015 ZL1 A6 396 stroker RWHP- depends on nitrous Last edited by CanadianZL1#992; 12-11-2014 at 04:10 PM.

12-11-2014, 04:45 PM	#11
MO'SZL1 Drives: 2012 Summit White ZL1 Join Date: Dec 2012 Location: San Diego Posts: 257	You won't have any problems I drag race with 305/35r18 MT ET streets ll and I have never had any problems __________________

12-12-2014, 12:37 AM	#12
alssiri Drives: 2017 ZL1 A10 Join Date: Aug 2009 Location: Dubai Posts: 1,250	I just bought 325/40/18 M&H RaceMaster Drag Radials which are the same stock height nealy & will be trying them soon. Ahmad __________________ 2017 ZL1 A10 SW (SOLD) Whipple 2.9 with 3.2 Pulley, Weapon-X Stage 3 Cam, FIICHILLER ,LG Motorsports LT, Borla S type, ROTFAB Big Gulp, Big 3 Reservoir Glassskinz rear window valance . 2012 ZL1 A6 (SOLD) Forged 376 CI, LSA HeartBeat, Mast Medium Bore Heads & JDP ZLR Cam, ARH LT , MagnaFlow Resonated X + Borla Atak Catback, ADM 102mm Snout, CAI, NW102MM TB, ID850, Fore Triple Fuel Pump, MSD Wire's, Moroso CC. Alky Control, FIICHILLER.

12-11-2014, 02:34 PM	#3
CAM....ZL1 Drives: 2012 ZL1 Join Date: Feb 2012 Location: BENTON, IL. Posts: 1,068 View My Garage	I believe the stock height is 305/35/20 because I have 305/45/18 drag radials and they are almost identical in height.

12-11-2014, 02:50 PM	#4
brian-nicola Drives: 2014 ZL1 Join Date: Oct 2011 Location: Nanaimo, BC Canada Posts: 241	When I checked with GM, their answer was no more than 3% difference.

12-11-2014, 03:25 PM	#6
Chrispy 11.91 ET Bone stock Drives: 2015 Camaro ZL1 Join Date: Nov 2014 Location: Canada Posts: 353	Thanks guys... Jessrayo - Any impact to A6 WOT shifting rpm? Cheers Chris

12-12-2014, 06:39 AM	#13
Stephen12ZL1 Drives: '21 ZLE A10 Join Date: May 2012 Location: Mechanicsville, VA Posts: 6,808	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. __________________ '21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60' '17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold)

12-12-2014, 08:14 AM	#14
Chrispy 11.91 ET Bone stock Drives: 2015 Camaro ZL1 Join Date: Nov 2014 Location: Canada Posts: 353	Thanks Stephen - What exactly do you do for your runs with the traction control? (What button press combo) Cheers Chris