jackkelly Posted January 27, 2014 Posted January 27, 2014 Got my car dyno'd on Saturday,Running .6 bar of boost standard ecu and engine on a hybrid.The car made 129 BHP at the wheels.And it made 184 NM's of torque at the wheels, how do I work this out to flywheel torque.I was told a rough estimate to get flywheel BHP is 20% of WHP and add it on.How do I workout the flywheel torque? Quote
AdamB Posted January 27, 2014 Posted January 27, 2014 It's around 15%ish losses through the transmission on a FWD motor. Why do you need to know the fly power? It's the power at the wheels that counts. Besides dynos read wheel power then convert to fly power on the overrun. Quote
jackkelly Posted January 27, 2014 Author Posted January 27, 2014 This one didn't convert at all. I'd just like to know so it would be handier Quote
Socks Posted January 28, 2014 Posted January 28, 2014 15% is the generic addon figure... 148.3bhp at fly Which is about right for that boost on that turbo... Quote
ryan lang Posted January 28, 2014 Posted January 28, 2014 all depends on the rolling radius of the wheel. best bet is to mark a point on the bottom of the tyre wall with some tape and another paralell mark on the floor, roll the car forward by hand until the tape is back facing the floor, then measure the distance, this gives the circumference but allows for some tyre deformation aswell. what gear the run was in, the gear ratio for that gear and your final drive if you can get me that info ill work it out for you. Quote
Flaminsam Posted January 28, 2014 Posted January 28, 2014 129 at the wheels is good! As said above there are literally hundreds of factors to take into account. Drag of the gears, bearings, seals etc. even the viscosity of the oil in the engine and gearbox. Quote
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