Subject	well you are correct, because the gearset is
Posted by	toyluvr on August 02, 2000 at 9:18 PM
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In Reply To	Speedo will read the same regardless of tire size posted by MikeH(Phoenix) on August 02, 2000 at 04:26 PM
Message	calculated for a certain set of parameters, including tire circum, & rear ratio. But, changing the rear tire size effectively changes the rear ratio, making the speedo read different than actual speed. It will also change the RPM the engine works at for a given 'true' MPH. This is what I was suggesting is his issue. His speed and typical RPM do not match by 5-8 mph. I think it is the wheel tire combo. Call it what you will, speedo error or 'actual' speed error, the result is the same. the speedo is NOT registering the correct speed, and changing the speedo gear is the fix. I have been through a ton of wheel/tire combos on too many cars, and the resulting speedo corrections. This is also one of the reasons that manufactuers strongly recommend not changing tire circum over 3%, because it will throw off the ABS calculations and resulting performance will degrade. "Sell crazy somewhere else, we're all stocked up here." - Jack Nicholson 'As Good As It Gets'
Follow Ups	rpm at 70 mph - peter 14:49:16 08/02/00 Re: rpm at 70 mph - z-extreme 15:04:45 08/02/00 That's about right>>> - GerryZ300 15:06:50 08/02/00 Re: I'm about 3000 at 80 in a TT (n/m) - barryinsac 15:16:31 08/02/00 remember, TT and NA have different rear end ratios... (n/m) - nixit(da][as) 15:43:40 08/02/00 OK, so you're at about 2600 RPMs around 70 right? (n/m) - GerryZ300 16:40:10 08/02/00 I bet your speedo is off because of tire size. - toyluvr 15:18:55 08/02/00 Speedo will read the same regardless of tire size - MikeH(Phoenix) 16:26:23 08/02/00 well you are correct, because the gearset is - toyluvr 21:18:40 08/02/00 well at 80 mph im at 3200 rpm with my na n/m - BlackZ32 18:37:45 08/02/00
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