Odometer/Speedometer Recalibrate?
11-25-03, 10:50 PM
#1
Lead Lap
Thread Starter
Odometer/Speedometer Recalibrate?
Okay -
I replaced the 17"'s on my LS-430 with 18's... Tire size went from 235/45-17 to 245/45-18s. Is this enough of a difference to warrant a recalibration?
L
I replaced the 17"'s on my LS-430 with 18's... Tire size went from 235/45-17 to 245/45-18s. Is this enough of a difference to warrant a recalibration?
L
Last edited by Leeladisky; 11-25-03 at 10:51 PM.
11-26-03, 01:54 PM
#3
Lexus Champion
With the new 18's when your speedo reads 60 mph your actually being doing 63.2 mph.
So, the speedometer with the new 18's is 5.3% too slow.
Your getting 756 revolutions per mile (RPM) with the new 18's versus 796 rpm with the old 17's based on 60mph.
I would leave it alone since it's less then a 5mph difference.
Hope that helped.
So, the speedometer with the new 18's is 5.3% too slow.
Your getting 756 revolutions per mile (RPM) with the new 18's versus 796 rpm with the old 17's based on 60mph.
I would leave it alone since it's less then a 5mph difference.
Hope that helped.
Last edited by SharpLS-96; 11-26-03 at 04:11 PM.
11-26-03, 04:19 PM
#4
Lexus Champion
Here's your answer:
http://www.dakota-truck.net/TIRECALC/tirecalc.htmlhttp://www.dakota-truck.net/CGI-BIN/TireCalc.cgi
http://www.dakota-truck.net/TIRECALC/tirecalc.htmlhttp://www.dakota-truck.net/CGI-BIN/TireCalc.cgi
Last edited by Lexkost; 11-26-03 at 04:21 PM.
11-26-03, 04:21 PM
#5
Lead Lap
Thread Starter
Originally posted by SharpLS-96
With the new 18's when your speedo reads 60 mph your actually being doing 63.2 mph.
So, the speedometer with the new 18's is 5.3% too slow.
Your getting 756 revolutions per mile (RPM) with the new 18's versus 796 rpm with the old 17's based on 60mph.
I would leave it alone since it's less then a 5mph difference.
Hope that helped.
With the new 18's when your speedo reads 60 mph your actually being doing 63.2 mph.
So, the speedometer with the new 18's is 5.3% too slow.
Your getting 756 revolutions per mile (RPM) with the new 18's versus 796 rpm with the old 17's based on 60mph.
I would leave it alone since it's less then a 5mph difference.
Hope that helped.
Thanks so much for the help!
L
Last edited by Leeladisky; 11-26-03 at 04:21 PM.
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