speedometer correction
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Originally Posted by Stingray23
will larger wheels and tires throw off my speedometer? i'm upgrading to 19's and 20's with 305-25-20 tires out back.
Team Owner
Joined: Feb 2001
Posts: 27,246
Likes: 130
From: Short Hills, NJ
Originally Posted by Stingray23
Whats the best way to correct that? Tune?
I thought the manual C5s corrected for gears/tires automatically, not sure about the C6s...I know autos needed the tuning software to do it though.
Le Mans Master
Joined: Nov 2005
Posts: 6,099
Likes: 64
From: Houston TX
St. Jude Donor '09
Originally Posted by cbrf4i1
or get taller tire / wheel combo.
When going to a larger wheel size, the best thing to do is to compensate with a lower profile tire so that the overall diameter does not change and the speedometer will still be accurate. Good tire shop will know what size tire is needed for 1" larger rims, and some tire websites I've seen even have a calculator for that.
Thread Starter
Le Mans Master
Joined: Mar 2006
Posts: 8,721
Likes: 707
From: New York
well, I think the stock rear tires are 285/30/19. the new tires are 305-25-20. does that make up for the difference so i wont need a tune? would anyone with experience please lend a hand. there are a lot of guys on this forum with upgraded wheels and tires. thanks.
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Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Originally Posted by Stingray23
well, I think the stock rear tires are 285/30/19. the new tires are 305-25-20. does that make up for the difference so i wont need a tune? would anyone with experience please lend a hand. there are a lot of guys on this forum with upgraded wheels and tires. thanks.
Le Mans Master
Joined: Nov 2004
Posts: 6,566
Likes: 2
From: Goleta CA
Cruise-In VIII Veteran
Originally Posted by LS1LT1
I thought the manual C5s corrected for gears/tires automatically, not sure about the C6s...I know autos needed the tuning software to do it though.
This is the same with automatics, they just require tuning to correct the shift points.