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07-16-2003, 09:23 AM
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#1 | |
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High on Potenuse
 
Join Date: Dec 2001
Location: Evanston, Illinois
Posts: 11,576
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Speedometer Difference
Wasup fellas. I've been wondering. Ever since I replaced my stock 15 in wheels with my 18's, I know the speedometer has been off. Not noticably, but science dictates that adding wheel diameter will throw off the ECU which still thinks it is rotating 15 inches worth of rim and rubber.
So my question is this: is the speedometer over or underestimated? ie, when the speedo says 60, am I really doing 58 or 62??? Sorry if I gave you a headache from reading this. I know I got a headache writing it. 
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ECNATSISER AL AVIV 
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07-16-2003, 10:11 AM
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#2 | |
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AF Fanatic
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what series tired do you have?
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*RIP* Integr8 aka Ryan *RIP* 5/29/03 www.fotki.com/esp THIS OG IS GONE retired for good. peace yall. create a crew for me |
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07-16-2003, 10:21 AM
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#3 | |
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AF Fanatic
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actually i just saw your sig. you got 225/40/18.
this is right from www.whalentire.com the place i got my rims and tires SELECTED TIRE SIZE:225/40R18 DIAMETER: 25.1" SECTION WIDTH: 8.9" SIDEWALL HEIGHT: 3.5" MINIMUM RIM WIDTH: 7.5" MAXIMUM RIM WIDTH: 9.0" REVOLUTIONS PER MILE: 804 IF YOU TRAVELED 60 MPH WITH THIS TIRE INSTALLED ON YOUR VEHICLE YOUR SPEEDOMETER WOULD READ 59.7 MPH so your speedometer is almost right, it is .3 mph off.
__________________
*RIP* Integr8 aka Ryan *RIP* 5/29/03 www.fotki.com/esp THIS OG IS GONE retired for good. peace yall. create a crew for me |
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07-16-2003, 11:27 AM
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#4 | |
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High on Potenuse
Join Date: Dec 2001
Location: Evanston, Illinois
Posts: 11,576
Thanks: 320
Thanked 407 Times in 346 Posts
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Thanx for the info. I knew the speedo couldn't be too off. I thought maybe 1mph.
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ECNATSISER AL AVIV
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