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Hey yeah, I didn't reply... haven't been feeling well.
Anyhow:
The pressure is probably higher. 2 of the old tires were leaky and I wasn't keeping a close eye on them. I tried to keep them around 32-36 psi but eventually gave up. The paperwork says the new ones are at 35, but I didn't check it myself.
My speedo seems more accurate, according to the radar signs "Your speed is ___". Before my speedo always read higher than my actual speed by a few mph. Now it's dead on. This is the cable speedo, not the electronic speedo.
I know the revolutions per mile are only about 20 revs different, and that's out of like 640 per mile anyway - what I think makes the difference is the small increase in length of the "lever arm" from the center of the axle to the road.
By increasing the lever arm, I reduced my mechanical advantage my car had against the road. Extremely small tires are easy to spin with a lot of force, the opposite is true with extremely large tires. It's like upping my differential gears by a few .1's.
Anyway, eh mileage might be up a little. I think the engine is doing fewer revs at the same speed on the highway and I don't mind going 60 so much as I did before. Got to fix that OD....
Happy Bricking
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1990 740 Turbo, on its way to stock specs, maybe beyond
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