So my car when i got it i tested all gears and how many miles i could get in every gear... i dont rember others but i do remember 74-75mph in 6th at 4,500~RPMs... i did an super oil change.. diferential, engine and tranny... now im getting 75mph at 4,000Rpm in 6th... thats a 500rpm less tham before... its that normal or could be the oil? I used OM recomended oils for everything

 

Oils dont change anything. You could fill them with peanut butter it wont change your MPH/rpm correlation.

 

Did you change the tires or wheels? Thats the only reason I could possibly think of.

 

That shouldn't even affect what shows in the instrument panel without a calibrator.


Sounds like you were in 5th when you did the first test lol.

 

No lol im pretty sure i was in 6th.. and i dont think car will only drop 500rpm from 5th to 6th at 75mph... and about the wheels yes i had first ap1 then ap2v2 but it was the same miles per RPM... but its ok i was just wondering if 75mph at 4kRPM its normal on an AP1... i know the car is all stock just intake and exhaust... (thats all i know)

 

Touche. Haha

 

75mph indicated = 4000rpm indicated in the AP1. Only way it was at 4500 at the same speed previously was if the clutch was slipping.

 

So the fact the the OP changed to larger wheels and tires could not have any affect on his RPMs?

 

Different diameter ties will have an effect on ACTUAL speed vs. rpm, but NO effect on INDICATED speed vs. rpm.

 

Not by the speed-o, you can put 22" tall tires on or move up to 27" tall tires, it won't change how the speed-o moves with the rpm's. The speed in real life(gps) will change but not on the speed-o. I run taller than stock tires on my "S" and at 60 I gained 2.4 mph, so my speed-o says 60 and my gps says 62.4 my odometer runs slower than real mileage now to.

ROD