Highway RPMS? 4.10s?
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#12
11 Second Club
iTrader: (1)
If you take a big hit in mileage with 4.10s and an M6 I would look at the tune or your driving.
RPM when tuned right does not hurt mileage much because the biggest load on an engine at cruise is aerodynamic drag on the body and rolling resistance of tires and bearings, brakes and gears don't affect that load. Yes the engine has to work a little harder to make the engine turn more but in the end the total amount of work it has to do which is mostly moving the car hasn't changed.
The A4 owners worry about this too much as well we do have overdrive and lockup so with 4.10s we are still turning lower rpm than say an oldschool musclecar with a three speed auto and no lockup with 3.08s, the gearing difference between 3.08 in 1:1 and 4.10s in overdrive is very similar but lockup makes an additional improvement.
RPM when tuned right does not hurt mileage much because the biggest load on an engine at cruise is aerodynamic drag on the body and rolling resistance of tires and bearings, brakes and gears don't affect that load. Yes the engine has to work a little harder to make the engine turn more but in the end the total amount of work it has to do which is mostly moving the car hasn't changed.
The A4 owners worry about this too much as well we do have overdrive and lockup so with 4.10s we are still turning lower rpm than say an oldschool musclecar with a three speed auto and no lockup with 3.08s, the gearing difference between 3.08 in 1:1 and 4.10s in overdrive is very similar but lockup makes an additional improvement.
#13
I'm just worried with 4.10s the motor would rev pretty high at highway speeds. i have 26" tires so i already rev a bit higher than stock
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Posted from LS1Tech.com App for Android
Last edited by jhobbins; 08-28-2012 at 11:12 AM.
#16
TECH Addict
iTrader: (1)
Interesting side note, the 94-up trans are rated at 450 TQ; while the 93 trans only 400 TQ.
Here is my source: http://www.f-body.org/faq/4/4_3.htm