Exhaust Options?

Ducati Dreams said:

Its now a "Japigale"

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Rich22 said:

That's a mock up

Today we hit 182 bhp with our test slip ons and the Rapidbike with some fuelling and ignition tweaks.

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tstephenson said:

at the crank or wheel?

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Rich22 said:

That's a mock up

Today we hit 182 bhp with our test slip ons and the Rapidbike with some fuelling and ignition tweaks.

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LarryG said:

Based on the fact that he wrote 182 bhp and not whp then I'm assuming he meant: the amount of power generated by a motor without taking into consideration any of the various auxiliary components that may slow down the actual speed of the motor. Sometimes referred to as pure horsepower, brake horsepower is measured within the engine's output shaft. Depending on the configuration of the engine, the point on the output shaft that is the focus of the measurement is the engine dynamometer.

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Andy1199 said:

Interesting to see they have a cover that goes up to the rear cylinder. That will be a heat issue then. It's definatley the rear cylinder not the exhaust that is causing the majoity of the heat issues I reckon.

Back on thread, that the worst exhaust I have ever seen, it's not released April 1st is it?

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Rich22 said:

182BHP at the rear wheel.

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wmcdonal said:

Brake horsepower is steady state horsepower.
BHP is measured by holding to wheel or engine speed and measuring the amount of force required to stop any increase in speed.

Many people think DynoJet dyno's measure rear wheel horsepower, that is not the case.
The DynoJet software adds a correction factor that they determined by testing a 1985 VMax. The factor was used to make the calculated HP match the claimed HP for the VMax.

Yamaha claimed 145hp for the VMax.
On an engine brake dyno the number was 120hp.
On DynoJets dyno the VMax only came out at 100hp so Mark Doebek ordered the chief engineer building the first DynoJet dyno to doctor the math to make the number read 120 to match the higher number shown on the engine brake dynos.
For ever more the DynoJet dyno's have shown an inflated figure.
People think a 250i DynoJet dyno uses the eddy current brake during a dyno power run, it does not. When you press the green button to start the run the brake power is released and the dyno acts as an inertia dyno.

This is why Ducati started to quote inertia dyno figures instead of crankshaft horsepower.
They get a bigger number on a DynoJet dyno than they do on the Apicom dyno connected to a crankshaft.
The important part of dyno tuning is the before and after numbers.
The myth that DynoJet dyno's read rear wheel horsepower is simply not true.

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