fly wheel power vs rwhp

[brettp]

anyone had there engine dynoed then put it in the car and a power figure at the rear wheels ? just had mine dynoed and was trying to guess flywheel power (i know there are variables)

[Vista]

Have a read here:

 

http://www.pumaracing.co.uk/coastdwn.htm

[turnover]

allways go by the wheel power on a rolling road as it cant lie,what power was it one engine dyno Brett which i take would be flywheel figure

[brettp]

never had the engine dynoed but got 310 at the wheels

[turnover]

probably around 380 t0 390 atf then Brett,you doing last round

[brettp]

really want to as i intended to do all rounds this year but had problems with the starter turned out to be wiring then it was running rough turned out to be mixture and was also running hot in traffic hense why i was thinking of trailering had a real good time at the round i did but i ve spent a fortune on rolling road fans wiring etc really want to but weather and cash dependent shakey is miles from southend and my car isnt the most economical

[turnover]

hire a recovery truck they do them down your end fairly cheep

[sambo]

Dyno figures tend to be a bit 'generous' sometimes.

 

My engine was dyno'd at making 285bhp and 225 lbft of torque.

 

i dont think it will be making that tbh, a 2.3 N/A cossie should only make around 235-240 real world HP. I expect the torque to be around 200lbft too.

[Fiesta Steve]

I think they all read differently, so depends where you take it

[deltamal]

Rule of thumb figure is bhp at wheels 30 less than at the flywheel, not accurate, but a guideline, mine was dynoed at 265bhp, so roughly 235 @ the wheels.

[turnover]

Dyno figures tend to be a bit 'generous' sometimes.

 

My engine was dyno'd at making 285bhp and 225 lbft of torque.

 

i dont think it will be making that tbh, a 2.3 N/A cossie should only make around 235-240 real world HP. I expect the torque to be around 200lbft too.

 

will deffo reed different as you have no drag and losses through drivetrain and tyres,hence when on a rolling road go by the wheel figure