08-03-2020, 12:35 PM | #1 |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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Speedo fix for different tire height without a tune?
Just wondering if anybody knew of a way to fix the speedometer after changing the wheel and tire height. I am running about 1" shorter front and back and mph is a bit off. No TC system issues though since the height stagger front to back is near stock. Thx in advance.
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08-03-2020, 01:22 PM | #2 |
Drives: 2016 2SS Convertible Join Date: May 2012
Location: St. Louis, MO
Posts: 1,703
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Unfortunately no. Speed is measured electronically by wheel and transmission sensors.
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08-03-2020, 01:34 PM | #3 |
Drives: 2019 ZL1 Join Date: Oct 2019
Location: GA
Posts: 573
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Thanks anyways!
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08-03-2020, 02:06 PM | #4 |
Drives: 2017 Camaro 2.0T, 91 Miata Join Date: Jan 2020
Location: Raleigh, North Carolina
Posts: 505
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You could buy HPTuners and the credits required to unlock the ecu, but that would be a pretty penny just to adjust the speedo yourself. Also, when I adjust mine to the autox tires the cruise control stops working. It seems to be confused by the extra RPMs for the speed I'm doing. No TCS issues though. YMMV as the ZL1 and 2.0T are totally different cars.
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08-03-2020, 03:35 PM | #5 | |
Drives: 2018 Hyper Blue ZL1 1LE Join Date: Dec 2018
Location: CA
Posts: 1,360
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Quote:
If so, seems like a bad idea to void warranty to fix speedo :-) |
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08-03-2020, 03:49 PM | #6 | |
Drives: 2017 Camaro 2.0T, 91 Miata Join Date: Jan 2020
Location: Raleigh, North Carolina
Posts: 505
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Quote:
I personally wouldn't do it just to adjust the speedo, but it is an option.
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08-03-2020, 04:48 PM | #7 |
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,808
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if the ECU is flashed for any reason, the dealer service can tell. Their GM Tech machine can detect it.
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'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) |
08-03-2020, 05:01 PM | #8 |
Drives: 2018 ZLE (M6/hyper blue) Join Date: Nov 2015
Location: Lithia, FL
Posts: 762
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Dang; didn't even think about that. Changing my 20s out for some OEM Z/28 wheels (19") tomorrow...
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08-03-2020, 06:42 PM | #9 |
Drives: ZL1/1LE parts added Join Date: May 2018
Location: Somewhere around Texas pines tress and smooth asphalt
Posts: 608
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08-03-2020, 07:44 PM | #10 |
Drives: Chevrolet Camaro ZL1 1LE Join Date: Jun 2019
Location: Florida
Posts: 127
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Best option is just use GPS to measure actual speed vs indicated and note the difference (it’s a fixed percentage). Use waze or other navigation is an easy way. Best way to tell actual speed so you can really know how far off you are
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08-04-2020, 07:40 AM | #11 | |
Account Suspended
Drives: 18 1SS/1LE Join Date: Jun 2018
Location: Missouri
Posts: 939
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Quote:
My girls jeep with 22"s/35" tires is off by 4mph (faster). |
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08-04-2020, 09:51 AM | #12 |
Drives: 2017 Camaro 2.0T, 91 Miata Join Date: Jan 2020
Location: Raleigh, North Carolina
Posts: 505
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When I first got my autox tires (305/30-19 compared to 275/35-20 for daily) I knew going in there would be a 5% difference. So 3 mph at 60, 4 at 80 etc. It's not too difficult to account for once you've figured it out.
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