Hey, I wasn't sure where to post this but I had a question about my Oldsmobile Calais. I took it to the dyno expecting to see some good numbers after my 15.7 run at the dragstrip. Since then all I have done is taken out my airbox and air silencer and put on an open air filter. It feels about the same if not better. Anyhow, the Quad 4 is rated at 150 hp and I believe 145 lb/ft of torque. My numbers were 114.7 hp and 136.2 lb/ft of torque. Does this seem correct to push a 2875 lb (with me in it) car to a 15.7 at over 88 mph??? Not to mention that my hp and torque curves drop bad after 4000 rpms which is where this car feels fast (DOHC). Below 4000 it is extremely slow. Do these numbers add up or what?
Thanks for any ideas on what is going on.

 

the number the dyno puts out is horsepower at the wheels (in your case the front). the advertised horsepower numbers from Olds are measured with just the engine, accessories, and exhaust (not installed in a car). Factor in a 22-18 percent decrease from engine (or net) horsepower to horsepower at the wheels because of power lost through the trans and drive axles.

 

I have always heard 15-20% loss but anyhow do you think I have the power/weight ratio to run a 15.7?? And do you think your Z28 has 114 hp to the wheels?? Because that lg4 is rated at 150 as well and probably loses more to the wheels since it is rear wheel drive. Just wondering...

 

The time of 15.7 is mathmatically possibly with that weight and power rating of 150hp 2875lbs, and must I say that must have been a near perfect run
Getting 136ft/lbs to the wheels from 145ft/lbs at the crank is only a 7% loss of torque and 23% loss of hp at 115hp,

As far as the 150hp LG4, that has a better torque rating and being rear wheel drive, it will lose around 10% of its torque before reaching the wheels which results in (90% x 240ft/lbs)=
216ft/lbs. Being rear wheel drive compared to your car it will lose around 30% horsepower (70% x 150hp)= 105hp at the wheels???