LLY: max rpm

[VinceGU05]

since i dont have a factory fitted truck nor tune, would is the max rpm of a stock motor and/or shift point with the Allison changing gears.

 

[onebaddmaxxx]

I usually set shift points at 3600rpm. Even on a built trans truck at the track, a truck was running constant 12.98s-13.01s shifting at factory and by loading a 3600shift tune, it dropped in the 12.70s

 

[BHoward6.6]

Max input speed for the allison is 5000 rpm.

 

[Dirtymaxx03]

stock valve train i would keep it 3600rpm's max.

 

[McRat]

In 100% stock trim, the Duramax will spin as high as 4800rpm when in tow-haul descending grades with heavy loads.

I've run them up to 5250rpm under boost. The highest peak HP rpm I ever tuned was 4800rpm with a single GT42mag.

As the RPM climbs, the piston cooling starts to fail. Starting at 4000 rpm, the piston starts to overheat, IMO based on the piston damage.

Your results may vary.

 

[Benltr]

TCM modified tune vs TCM stock tune : same day

Easy 0,1-0,15 ET Gain and approx 1 mph

TCM modified tune shift maybe between 3600-3700

 

[VinceGU05]

ok thanks peoples

so what does a factory stock truck shift at?

 

[hondarider552]

3150-3250

 

[VinceGU05]

Thanks HR