xr6tee9 Member 82 Member For: 11y 2m 15d Gender: Male Location: adelaide Posted 05/02/14 09:20 AM Share Posted 05/02/14 09:20 AM hi all, just changed from 235/45/18's to 245/35/19's on my bf xr6t.. I plugged in the sct tuner to reset parameters but as it only has 2x custom tunes installed it didnt have that option... upon taking it for a drive it doesnt seem my speedo is out, judging by other traffic and speed zones... so my question is .. is the speedo electronically controlled from the transmission or at the rear wheels..? do I need to speak with my tuner about resetting it... I think the difference was about 8 revolutions per km doing the maths.. Link to comment https://www.fordxr6turbo.com/forum/topic/87461-changing-wheel-diameter-size/ Share on other sites More sharing options...
Bizkets is Drunk? Too heavy needs boost Member 5,929 Member For: 11y 8m 7d Gender: Male Location: Adelaide Posted 05/02/14 09:23 AM Share Posted 05/02/14 09:23 AM was there an oppitnal upgrade to 19's on the bf from factory or was it only 18's. if the was an option for 19's there shouldn't be a problem. I had 245/35 r19 on a ba and never had an issue. Link to comment https://www.fordxr6turbo.com/forum/topic/87461-changing-wheel-diameter-size/#findComment-1453454 Share on other sites More sharing options...
Bizkets is Drunk? Too heavy needs boost Member 5,929 Member For: 11y 8m 7d Gender: Male Location: Adelaide Posted 05/02/14 09:34 AM Share Posted 05/02/14 09:34 AM :D Link to comment https://www.fordxr6turbo.com/forum/topic/87461-changing-wheel-diameter-size/#findComment-1453455 Share on other sites More sharing options...
xr6tee9 Member 82 Member For: 11y 2m 15d Gender: Male Location: adelaide Posted 05/02/14 09:42 AM Author Share Posted 05/02/14 09:42 AM On 05/02/2014 at 9:20 AM, xr6tee9 said: hi all, just changed from 235/45/18's to 245/35/19's on my bf xr6t.. I plugged in the sct tuner to reset parameters but as it only has 2x custom tunes installed it didnt have that option... upon taking it for a drive it doesnt seem my speedo is out, judging by other traffic and speed zones... so my question is .. is the speedo electronically controlled from the transmission or at the rear wheels..? do I need to speak with my tuner about resetting it... I think the difference was about 8 revolutions per km doing the maths..correction.. my 18's are 235/40's.. and ive just realised this should have been posted in 'wheels & tyres'it works out to a 1% error in speedo, so at 100kmh I am really doin 101.4kmh...is it really worth worrying about..?? Link to comment https://www.fordxr6turbo.com/forum/topic/87461-changing-wheel-diameter-size/#findComment-1453459 Share on other sites More sharing options...
Benny Member 1,869 Member For: 21y 8m 7d Gender: Male Location: Newcastle Posted 07/02/14 03:51 AM Share Posted 07/02/14 03:51 AM Considering your speedo will have a factory programmed error at 100kph of approx 3%. Meaning your speedo says 100 but you're really doing 97 then you will be fine.Benny. Link to comment https://www.fordxr6turbo.com/forum/topic/87461-changing-wheel-diameter-size/#findComment-1453789 Share on other sites More sharing options...
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