I understand what everyone is saying but why does the chart say
Power at wheels=227 BHP
Power at the flywheel=270 BPH
They are both at diffrent spots but both use BHP.
I went with Saki and my numbers were only 13 hp over stock. I had 243 BPH to the wheels and 290 Lb ft tq. I should be in the 300 range for hp and deep in the 300's for tq

 

If they're saying you have bhp to the wheels, they're just confused with names. If you figure 15-20% drivetrain loss, then you're not really too far from your expectations in bhp - crank horsepower.

 

Well... This actually promted me to call the Dyno guys and ask.


I spoke with the Dyno Operator today on the phone. He says that the units of measurement used to measure Horsepower in the states and in the UK are slightly different ---- Whenever they Dyno cars for Americans, 99% of the time we predict our cars to make approximately 25-30 (and in extreme cases, 40) more Horsepower to the WHEELS than the dyno reads. He states that they've measured Mustang GT that stateside dynoed at nearly 350 rwhp - only pulling 317 bhp@wheels. He says the reason for this is that the way the U.S. measures 1 mile is different from the way the UK measures 1 mile.

Um. Okay...

However, a bit of good news is our Torque measured in the US and the UK is nothing more than a calculation, and that they've been able to confirm with american users that it's pretty much spot on.


*Extra* I also asked him how come he never took it to redline when dynoing. I found myself feeling pretty dumb as soon as the question came out of my mouth because I already knew the answer: He was in fourth gear - he was only taking the car up to the point where the meter stopped reading power. Once it curved over that point and began it's declination, he let off of the gas and put it in neutral to read the rest of the engine's decreasing performance. This goes into calculation of the bhp, and is added on to it... The dyno operator was eager to help me, thankfully, so if you guys have any more questions, I can ask him for you.


~Saki

 

The only thing I can think of is that the "b" in his bhp doesn't stank for brake. Bhp in the USA is by definition the horsepower at the crank, so it's can't be measured at the wheels. Case of same acronym, different meaning perhaps...

Maybe it's "British horsepower".

 

I'm confused when you said torque is measured and is nothing but a calculation...HP is a calculation from tq which is measured... so if both US and UK tq numbers are rigth on, then there HP mearsure is screwy...but that's kinda normal, since a Mustang dyno to a DynoJet will do the same thing hp wise....