engine rpm

[02ilduramax]

i have searched a bit but didnt get a positive answer or real life examples how high can you rev a duramax ..lb7 in particular say if it were drag only truck i believe the higher rpms would be better for speed . i read that banks revently revved their supercharged duramax to 8000 i believe just looking for knowledge and how fast one could be spun

 

[hondarider552]

Depends on cam, heads and supporting mods.

That being said I've seen 4200 once. No need for me to rev it any higher with stock cam and heads

 

[delong_1]

also depends on turbo setup, stock motor with 66/80 turbos my trucks power curve was pretty flat until 4k so i ran it to 4ish at the track.

 

[Hot COCOAL]

I think the "norm" for typical extreme D-max performance is 4200-4500 for guys sled pulling and running semi-built to fully built engines, I know that there's a few adventurous guys here pushing stock engines close to that RPM realm as well, but I couldn't tell ya hiw many minutes of use they're getting out their engines at that RPM tho

Gale Banks has had a personal goal to hit that 8k mark for damn near a decade now, I didn't realize he'd finally done it...just keep that in mind, it took "Gale Banks" nearly a decade to accomplish that feat...

 

[JoshH]

I've spun the dumpster to 4000+ a bunch of times (pretty much every time I do a burnout). A couple of weekends ago, I went through the traps at 4400 RPM, and I did the same thing once or twice a couple of years ago. I didn't really mean to do it, but it doesn't seem to have hurt it any. I know it's an LBZ instead of any LB7, but the valve train and rotating assembly are very close to the same.

 

[02ilduramax]

I thought I had read somewhere that the lb7 was limited because of the ecm not being able to process information very fast in the higher rpm but I could be wrong

 

[henery97]

I've seen 4000 before with my stock LBZ. No need to do it because the stock turbo is such a restriction that it dies off FAST above 3500rpm or so

 

[07metallicgreen]

my lbz in my sig has turned 4800 a couple times pulling

 

[LWATSON]

I wasn't paying attention at the strip heating up my tires and turned mine 4800. Blew a heater hose and ruined a water pump. Coincidence?

 

[Yellow Jacket]

I thought I had read somewhere that the lb7 was limited because of the ecm not being able to process information very fast in the higher rpm but I could be wrong

I've turned many stock lb7 and stock bottom end trucks 4200-4500 sled pulling, and customers of mine, we are turning my pulling LLY 5200-5500 rpm on a regular basis now with the new found power, changed camshaft too. But I don't think that really changed much, same intake and exhaust duration anyways...

 

[NC-smokinlmm]

I ran my LMM up to 4000 all the time. She liked it and there seemed to be no determinate from it...