Drag pack tire sizes
Drifting
Joined: Apr 2000
Posts: 1,442
Likes: 209
From: Lake Mary Florida
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).
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 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 dropped 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.
Any guidance will be appreciated.
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 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 dropped 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.
Any guidance will be appreciated.
Le Mans Master
Joined: Apr 2011
Posts: 7,820
Likes: 411
From: Montreal
St. Jude Donor '13
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).
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 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 dropped 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.
Any guidance will be appreciated.
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 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 dropped 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.
Any guidance will be appreciated.
To end up safe what I did is figure out the exact difference of the stock tire hieghts and stick to something with a similar difference.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
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).
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 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 dropped 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.
Any guidance will be appreciated.
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 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 dropped 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.
Any guidance will be appreciated.
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Drifting
Joined: Apr 2000
Posts: 1,442
Likes: 209
From: Lake Mary Florida
That M&H tire actually measures to 27.2 inches when on the car. I run them with PSS 225/45/18 and have no issues with nannies. I don't have my notes as I'm away at SEMA and forget the exact height of the fronts. You could look it up and if you can find something about the same height you won't have issues.
To end up safe what I did is figure out the exact difference of the stock tire hieghts and stick to something with a similar difference.
To end up safe what I did is figure out the exact difference of the stock tire hieghts and stick to something with a similar difference.
The stock dimensions are 25.6/26.7=4.3%. I have a 345/30/19 NT05R on the car (27.3=6%) now with no problems. If the M&H are 27.2 as you report they are the same as the Nittos and should be OK.
Drifting
Joined: Apr 2000
Posts: 1,442
Likes: 209
From: Lake Mary Florida
Assuming you will not be using those wheels/tires on the street, you won't have enough time or distance on them at the track for the nannies to cause problems due to size differences. The nannies reset themselves every time you shut down, which is why you have to push the TC button to deactivate them each startup.
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Thanks for the info. There has been a lot of conflicting information on this subject out there as well as the impact of running low tire pressure with the TPMS in place (computer goes crazy and limits speed to 55 mph). I would like to run with TC off and AH on. The car will see almost all dragstrip time and be trailered to/from the track.
The AH saved my butt one time when I hit a water spot near the finish line from the guy before me that blew a radiator hose. It was a night session and not visible. Suddenly getting crooked at 120 is not fun. My reaction time was a lot slower than AH.
Former Vendor
Joined: Aug 2005
Posts: 16,897
Likes: 412
From: Lewisville TX
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13
Get a hold of Mark.
He can get you setup with wheels/tires/spindles and the whole works for the car if you are wanting to do something like that.
https://carlyleracing.com/
He has been a dealer of ours for a long time and runs the LG Drag spindles on his car.
He can get you setup with wheels/tires/spindles and the whole works for the car if you are wanting to do something like that.
https://carlyleracing.com/
He has been a dealer of ours for a long time and runs the LG Drag spindles on his car.
Team Owner
Joined: Nov 2007
Posts: 24,035
Likes: 2,342
From: Gilbert AZ
28s will work fine. I drove for the past 3 weeks on my 325/50/15s, no issues. Just have to get close to the same front size. When I had a 25.6" front I would get some engine drag warnings, but went to a 26.8" front and no issues.
Racer
Joined: May 2014
Posts: 467
Likes: 3
From: "Mexico" NC
