2013 GS Drag Package Specs
Drifting
Joined: Apr 2000
Posts: 1,442
Likes: 209
From: Lake Mary Florida
I have a 2012 A6 GS nearing completion (ECS w/ meth, 2600 stall, 3.42 Z06 rear, 700+ RWHP) and I am still trying to find a drag pack wheel/tire combo that will not set off the AH/TC demons due to front/rear tire diameter greater than tolerated by the computer. I would like to go with a 17" rear rim to avoid going to drag spindles. Vengance Racing sells a GS/Z06 Weld Package with a 185/50/18 M&H front (25.2 tall) and a 325/45/17 M&H rear (28.5) tall, but that combo has a 13% diameter difference. I have been trying without success to find out the maximum % the computer will allow; I received some info 4-5% is it. I am led to believe a 28" tall rear tire will set off the AH/TC nannies and render the GS useless (and possibly dangerous). However, Vengance says this combo will work and referred me to a customer who has the setup and it does work.
Thanks in advance.
BIGMAC
Le Mans Master
Joined: Jul 1999
Posts: 5,005
Likes: 38
From: jackson nj
If you check out a company named "Race Star" (I do not have their website info with me while traveling) for rims you should find good fronts already available. They introduced 18 x 5 rims for the front of the GS/ZO6 late last year (which did not even make their catalog) and will be introducing many more rims for Corvettes in the near future (if they are not already made). 
I do not have all the info on the rears that I use with me as I am traveling but can get the details when I get back home. If I remember correctly they are BFG 275/18's on the front GS rims or a set of MT 265/40-18's mounted on aftermarket 10 spoke ZO6 rims. The BFG's are slightly shorter compared to the MT's but both had OK launch, but remember I also have an almost stock GS with no converter...which I hope to remedy shortly...LOL
I do not have all the info on the rears that I use with me as I am traveling but can get the details when I get back home. If I remember correctly they are BFG 275/18's on the front GS rims or a set of MT 265/40-18's mounted on aftermarket 10 spoke ZO6 rims. The BFG's are slightly shorter compared to the MT's but both had OK launch, but remember I also have an almost stock GS with no converter...which I hope to remedy shortly...LOL
Last edited by Redvette_22; Feb 1, 2015 at 08:47 AM. Reason: more details
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,108
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I will be very interested in replies to this thread. I have been trying to find a definitive answer for some time without success. The information has been all over the place.
I have a 2012 A6 GS nearing completion (ECS w/ meth, 2600 stall, 3.42 Z06 rear, 700+ RWHP) and I am still trying to find a drag pack wheel/tire combo that will not set off the AH/TC demons due to front/rear tire diameter greater than tolerated by the computer. I would like to go with a 17" rear rim to avoid going to drag spindles. Vengance Racing sells a GS/Z06 Weld Package with a 185/50/18 M&H front (25.2 tall) and a 325/45/17 M&H rear (28.5) tall, but that combo has a 13% diameter difference. I have been trying without success to find out the maximum % the computer will allow; I received some info 4-5% is it. I am led to believe a 28" tall rear tire will set off the AH/TC nannies and render the GS useless (and possibly dangerous). However, Vengance says this combo will work and referred me to a customer who has the setup and it does work.
Thanks in advance.
BIGMAC
I have a 2012 A6 GS nearing completion (ECS w/ meth, 2600 stall, 3.42 Z06 rear, 700+ RWHP) and I am still trying to find a drag pack wheel/tire combo that will not set off the AH/TC demons due to front/rear tire diameter greater than tolerated by the computer. I would like to go with a 17" rear rim to avoid going to drag spindles. Vengance Racing sells a GS/Z06 Weld Package with a 185/50/18 M&H front (25.2 tall) and a 325/45/17 M&H rear (28.5) tall, but that combo has a 13% diameter difference. I have been trying without success to find out the maximum % the computer will allow; I received some info 4-5% is it. I am led to believe a 28" tall rear tire will set off the AH/TC nannies and render the GS useless (and possibly dangerous). However, Vengance says this combo will work and referred me to a customer who has the setup and it does work.
Thanks in advance.
BIGMAC
If you want to know the safe limits in the GM program, not necessarily the absolute limits, do this calculation.
Find the circumference of your new OEM tires and the circumference when the tread depth is gone. aka bald. Compare new fronts to bald rears and bald fronts to new rears. Those ratios are assured to be safe, even if the bald tires aren't.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
I will be very interested in replies to this thread. I have been trying to find a definitive answer for some time without success. The information has been all over the place.
I have a 2012 A6 GS nearing completion (ECS w/ meth, 2600 stall, 3.42 Z06 rear, 700+ RWHP) and I am still trying to find a drag pack wheel/tire combo that will not set off the AH/TC demons due to front/rear tire diameter greater than tolerated by the computer. I would like to go with a 17" rear rim to avoid going to drag spindles. Vengance Racing sells a GS/Z06 Weld Package with a 185/50/18 M&H front (25.2 tall) and a 325/45/17 M&H rear (28.5) tall, but that combo has a 13% diameter difference. I have been trying without success to find out the maximum % the computer will allow; I received some info 4-5% is it. I am led to believe a 28" tall rear tire will set off the AH/TC nannies and render the GS useless (and possibly dangerous). However, Vengance says this combo will work and referred me to a customer who has the setup and it does work.
Thanks in advance.
BIGMAC
I have a 2012 A6 GS nearing completion (ECS w/ meth, 2600 stall, 3.42 Z06 rear, 700+ RWHP) and I am still trying to find a drag pack wheel/tire combo that will not set off the AH/TC demons due to front/rear tire diameter greater than tolerated by the computer. I would like to go with a 17" rear rim to avoid going to drag spindles. Vengance Racing sells a GS/Z06 Weld Package with a 185/50/18 M&H front (25.2 tall) and a 325/45/17 M&H rear (28.5) tall, but that combo has a 13% diameter difference. I have been trying without success to find out the maximum % the computer will allow; I received some info 4-5% is it. I am led to believe a 28" tall rear tire will set off the AH/TC nannies and render the GS useless (and possibly dangerous). However, Vengance says this combo will work and referred me to a customer who has the setup and it does work.
Thanks in advance.
BIGMAC
The M&H really measure closer to 27 when on the car. 27.2 on mine if I remember right.
Geaux Tigers!!!!
Joined: Nov 2007
Posts: 2,732
Likes: 424
From: DeRidder LA
St. Jude Donor '08 thru '26
You can PM me for my contact at RaceStar because the people there go over and above to help you with choosing the right wheels.
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Instructor
Joined: Mar 2012
Posts: 112
Likes: 0
From: Amity Pa
Myself, and I am sure other run that same setup or very close with no issues. I have the same rears, and 225/45/18 on the front. It was a tossup between 45 and 50 and I think either would be fine.
The M&H really measure closer to 27 when on the car. 27.2 on mine if I remember right.
The M&H really measure closer to 27 when on the car. 27.2 on mine if I remember right.
Le Mans Master
Joined: Apr 2011
Posts: 7,821
Likes: 412
From: Montreal
St. Jude Donor '13
Those racestars in the pics above look nice. Personally I am a huge fan of the way Welds look, and those tires look small in the rear.
