Speedo and Energy Suspoension mysteries

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Washington, UT. The Promised Land
I have now my fourth Toyota, a 1997 4Runner with the 3.4 and an auto for my wife to drive around. What I cannot figure out is why the speedo and odo are dead on when it originally came with the smaller 15" wheels but currently has 265/70R16s on it. It has 4.10 gears which, as I understand, are what you got with the smaller wheels. Weird.

The second "weirdness" is the Energy Suspension sway bar kit. It was a chore, (I did the steering rack bushings at the same time) but the improvement is quite noticeable. The part that baffled me is why they put bushings in the kit for the ends of the stabilzer bar that are too tall. There is no freakin way to mash them down enought to get the nut back on the end link. I can say this; a cutting wheel on an angle grinder cuts polyurethane quite nicely. I shaved each one of the fat little buggars about 1/16" which was the absolute minimum required to get the nut started on the end link. Even when tightened down properly, there are just a couple of threads portruding above the nut. This is just poor design.
 
lehiguy said:
The tires are bigger, 265/70R16 vs. 225/60R15. I don't get it. Are the speedos off in stock form?

What have you compared it with? A navi? I've read that there was a (IIRC) 10% margin of error for the speedometer in Toyota factories. But this doesn't explain why it would change with the tire size. It should be a set ratio and stick with it until it's mechanically changed. Or is new enough to be fly-by-wire changed.

I put 33s on my Taco and the speedo now reads 70 when doing about 76. It was off a few mph before, but even then I was a little off from stock size tires. My little car, it used to be spot on with TomTom until I got some new wheels. They were a .5" wider and I put the same size and brand 225/40-18 tires back on. Now it's speedo reads a few mph faster than it really is. Every little bit changes things. That half inch of tire stretch changed the speedo about 3 mph.

I know that navi's aren't the most dependable, but every time I spot one of those radar-speed signs it's spot on. I've even compared it with the navi in the wife's Lexus after I got the new wheels on my car just to make sure. Spot on again.
 
I checked the odo against the mile markers on a 10-mile length of freeway. I timed one mile increments with a watch (48 seconds per mile at 75 MPH) several times. I am dead on when I should be reading low. Weird.
 

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