xr6bt1 Member 25 Member For: 16y 10m 13d Gender: Male Location: Melbourne Posted 26/10/08 11:31 PM Share Posted 26/10/08 11:31 PM Just put a set of 20's on the car on saturday (pics to come shortly) and as expected my speedo is now out. I was thinking it would be about 4-5kays off at 100km/h. I went cruising on sunday and hooked up the GPS to see how far out it was. I found that it is actually 9kays off at 100, so speedo reads 92 but car is doing 100. Is this about normal? I have 255s on the rear and 225s on the front, rims are 8.5inch wide front and rear. Car is a BF Mk2 XR6 Turbo.Also wondering if there are any places in the western suburbs that can re-calibrate the speedo?Cheers Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/ Share on other sites More sharing options...
senna_T Forged Member Lifetime Members 15,818 Member For: 18y 3m 3d Gender: Male Location: SW Sydney Posted 26/10/08 11:34 PM Share Posted 26/10/08 11:34 PM I drove a GT to melb. with 20s and the GPS said that was out by 6km/h - but they come standard with 18's - if your car came with 17s from the factory that could explain the increase Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-756026 Share on other sites More sharing options...
YPURV4 KILL,KILL,KILL,DIE,DIE,DIE, Member 2,813 Member For: 19y 6d Gender: Male Posted 26/10/08 11:41 PM Share Posted 26/10/08 11:41 PM yeah that's about right mine is 7ks out. Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-756029 Share on other sites More sharing options...
XRSCAR Member 414 Member For: 17y 3m 1d Gender: Male Location: FTG, Victoria Posted 26/10/08 11:42 PM Share Posted 26/10/08 11:42 PM gone from 17" to 19" and my speedo is more accurate than ever Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-756030 Share on other sites More sharing options...
xr6bt1 Member 25 Member For: 16y 10m 13d Gender: Male Location: Melbourne Posted 27/10/08 12:05 AM Author Share Posted 27/10/08 12:05 AM Yeah went from 17s to 20s. got some getting used to I guess. Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-756035 Share on other sites More sharing options...
Mr Man Mad Scientist Member 816 Member For: 20y 5m 11d Gender: Male Location: Vic Posted 27/10/08 12:16 AM Share Posted 27/10/08 12:16 AM XRSCAR said: gone from 17" to 19" and my speedo is more accurate than ever :o with the 17s on, at 100km/h on the speedo it showed 97 on the gps, and now with the 19s on 100km/h on the speedo is 101 on the gps.... Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-756039 Share on other sites More sharing options...
Guest Guests Posted 27/10/08 02:23 AM Share Posted 27/10/08 02:23 AM You can have your rolling diameter changed via the edit if I'm not mistaken & that will make your speedo spot on Never done it myself but pretty sure it can be done... Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-756074 Share on other sites More sharing options...
RUS531 RUS531 Donating Members 410 Member For: 18y 8m 20d Gender: Male Location: Emerald QLD Posted 27/10/08 03:23 AM Share Posted 27/10/08 03:23 AM my speedo is out by about 5ks and I went from 17's to 20's Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-756113 Share on other sites More sharing options...
86gav 69 - PSI Donating Members 263 Member For: 19y 7m 16d Location: Gladstone QLD Posted 04/11/08 11:22 AM Share Posted 04/11/08 11:22 AM RUS531 said: my speedo is out by about 5ks and I went from 17's to 20'sMine is about 9k's out with 245/30'sGav Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-762277 Share on other sites More sharing options...
seventytwo Still have a turbo, it's just on a diesel. Lifetime Members 5,368 Member For: 19y 10m 3d Gender: Male Location: The 8th Dimension Posted 04/11/08 11:35 AM Share Posted 04/11/08 11:35 AM Tyre calculatorTry this little gem Link to comment https://www.fordxr6turbo.com/forum/topic/51080-speedo-reading-with-20s/#findComment-762302 Share on other sites More sharing options...
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