Anyone know what % a typical bonneville loses before it puts the power to the ground? The % difference typical between crank hp and torque and wheel hp and torque?

I've heard as high as 25%, but don't see much out there on it.

Between 18 & 20%.

so were losing like 46 ft lbs of torque?! so its only putting like well in my case like 184 lbs of torque to the ground? or am i confused beyond measure.

The power at the crank and the power to the ground are totally different, now imagine lesser cars with WAY less torque...only getting double digits to the ground

Thats exactly right. For instance if you make 200hp on the dyno it sounds a little low, when really the engine is putting out 250. If you make 320hp to the wheels the engine is putting out 400hp! That is why I have always said Series II L67'* have way underrated torque, because GM rates them at 280lb.ft, but I have seen stock L67'* pull 270lb.ft to the wheels which is over 330lb.ft at the crank. Once you get up into high horsepower numbers it gets really really crazy.

Very interesting. On my Aurora when I dynoed it I figured and many others that a Northstar weither 4.0 Aurora or 4.6 caddy will lose 24% through a 4t80-e tranny. My baseline dyno was 190HP at wheels =250 crank. I'm sure Jim liked this little fact.

Da na na na na HEY da na na na na na HEY



190 HP at the ground is nice...still 35HP more then my 89 ( and it was 165 at the crank)

Thanks for that little tid bit Taylor...

so im guessing the numbers that GM advertises are at the crank? to make it sound more impressive.

me too, 85 Buick Somerset, 92hp. My first car.