Bigger Rims = Speedo Error?

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07-14-12, 06:52 PM

#16

ohiois350

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Quote:

Originally Posted by DigitalDon

Hm, so after years and years of driving, your ODO will show a lot more miles than actually traveled.

Really it would shown more miles than what u actually drive on ODO?

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07-14-12, 10:52 PM

#17

Sffd103

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I wouldn't run the tires sizes that Mike at Vossen suggests if you plan on lowering. Sorry Mike

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07-15-12, 10:50 AM

#18

Krizzle

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So I'm a recent convert from bmws.... I can't believe what ur saying is true as bmws have had this fixed since early eighties. In most modern cars the speed sensor is in the primary differential. I have a hard time believing in a car with all this technology the is250 doesnt have the same setup. The sensor monitors the rotation of the diff gears tracking the correct mileage and speed based on the rate of rotation of the drive train. So where is the speedo sensor on an is250?

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07-15-12, 10:56 AM

#19

Sango

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BWM is different, they have the ability to input the rev/mile and stuff to correct the spedo from what my co-worker has told me (he owns an M3).

Quote:

Originally Posted by Sango

The Lexus vehicle does not have the ability to to reprogram the speed sensors.

The engineers at Lexus at programmed it such that the spedometer will always report accurate speed or above but never below your actual speed, assuming the proper tires are used.

This is what it would be.

Quote:

Originally Posted by Lexus

Standard indication (Actual speed) / Acceptable range
(speedometer display)

20 mph / 20.0 to 23.0 mph

40 mph / 40.0 to 43.5 mph

60 mph / 60.0 to 64.0 mph

80 mph / 80.0 to 84.5 mph

100 mph / 100.0 to 105.0 mph

120 mph / 120.0 to 125.5 mph

140 mph / 140.0 to 146.0 mph

160 mph / 160.0 to 166.5 mph

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07-15-12, 06:45 PM

#20

TicDatDo

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Quote:

Originally Posted by krUnIzZe

I'm Thinkin Of Getting 20" Vossen CV3 Rims.

I Think I Have The 17 Inch Stockies And I Am Wondering If I put 20 Inch Rims On Mt IS250 AWD, Will There Be Any Speedometer Error?

Im guessing you meant "my" and not "mt (manual transmission)" because they don't make MT for AWD.