[Z06] Reprogram computer for new tire size?
Thread Starter
Instructor
Joined: Nov 2009
Posts: 108
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Reprogram computer for new tire size?
Anyone know how to reprogram the car for a new tire size? I could use my laptop on my old Trans Am, but I don't have any software for my Z. A buddy with a 99 C5 said you could do it in the DIC. Is this true?
Drifting
Joined: Nov 2008
Posts: 1,450
Likes: 140
From: Palm Beach Florida
I was throwing the AH/TC lights after a switch to 18" all around on my 03Z. The dealer and others told me it is one of the things that can't be tuned. Had to stay a 1/2" smaller in front to keep the ratio.
Drifting
Joined: Nov 2008
Posts: 1,450
Likes: 140
From: Palm Beach Florida
If I remember correctly I had 315/30 out back and 285/35 up front in PS2's. I have no confidence in any dealer but are you trying to say this can be tuned?? Because I'm told by more than one to keep the ratio no matter what tires because it can't be tuned out on a C5Z.
Drifting
Joined: Nov 2008
Posts: 1,450
Likes: 140
From: Palm Beach Florida
This is what I said in my first post. 1/2" smaller up front no matter the tires size. I have been told here and by two tuners this table can not be tuned, but you keep saying a great tuner can do ANYTHING??? kinda misleading. So you or your tuner have solved this issue and can tune the tire ratio???
Team Owner
Joined: Aug 2007
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From: I live my life by 2 rules. 1) Never share everything you know. 2)
St. Jude Donor '11-'12-'13, '16-'17-'18
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Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
I run 18s all around.
Front
18x12 with 18x305/30s
rear
18x13 with 18x335/30
Only time I had a bit of trouble was when I was running a square set up
18x25.5x11.5 on all corners. Just turned the TC/AH off
Front
18x12 with 18x305/30s
rear
18x13 with 18x335/30
Only time I had a bit of trouble was when I was running a square set up
18x25.5x11.5 on all corners. Just turned the TC/AH off
Safety Car
Joined: Jun 2005
Posts: 4,977
Likes: 256
From: St. Louis Missouri
And I ran 295/35/18 on all 4 corners for 6 months without AH/TC issues.
Software can be purchased from HP Tuners, EFI Live and LS1 edit to make the changes. Or, you can visit a local tuner who already has the software.
Software can be purchased from HP Tuners, EFI Live and LS1 edit to make the changes. Or, you can visit a local tuner who already has the software.
Melting Slicks
Joined: Aug 2006
Posts: 3,123
Likes: 116
From: North Dallas Forty Orange County, Ca.
St. Jude Donor '08-'09-'10-'11-'12-'13, '15,'21
You have two topics running here, odometer adjusmtment for non-stock tire and ABS.
I run 19's all around, 275*30 and 305*30, without any problem with ABS.
My tuner made an adjustment for rear tire size using HP Tuners. While I think he does a great job with my car, it only took him 10 minutes to calc the roll travel and make the adjustment so I don't think it was all that hard.
I run 19's all around, 275*30 and 305*30, without any problem with ABS.
My tuner made an adjustment for rear tire size using HP Tuners. While I think he does a great job with my car, it only took him 10 minutes to calc the roll travel and make the adjustment so I don't think it was all that hard.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
But is is really worth it? not just for tire size changes.
Last edited by AU N EGL; Aug 21, 2010 at 08:41 AM.
Melting Slicks
Joined: Aug 2006
Posts: 3,123
Likes: 116
From: North Dallas Forty Orange County, Ca.
St. Jude Donor '08-'09-'10-'11-'12-'13, '15,'21
You're correct, wouldn't make a trip to tuner just for this but if you're already there.... Mine was off by about 3%, so 3 MPH at 100 isn't a big deal. But the accumulation on the odometer might be a different story.
