Exhaust Options? - Page 2

hdobhal · August 8th, 2012, 02:24 PM

Quote:

Originally Posted by Ducati Dreams

Its now a "Japigale"

japigale

Rich22 · August 9th, 2012, 12:42 PM

That's a mock up

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

tstephenson · August 9th, 2012, 05:50 PM

Quote:

Originally Posted by Rich22

That's a mock up

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

at the crank or wheel?

LarryG · August 10th, 2012, 03:47 AM

Quote:

Originally Posted by tstephenson

at the crank or wheel?

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.

jarelj · August 11th, 2012, 05:48 AM

Quote:

Originally Posted by Rich22

That's a mock up

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

That's great, can you expand on the RapidBike module specifics? Was it the "Race" version, and how is it fitted to the bike? Can you post a dyno chart, I'd be curious to see the torque curve.

ttkarp · August 11th, 2012, 09:02 AM

Quote:

Originally Posted by LarryG

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.

So...crank or wheel?

tbot · August 11th, 2012, 10:29 AM

BHP is brake horse power, which is always considered at the crank and not the wheel

Rich22 · August 13th, 2012, 06:23 AM

182BHP at the rear wheel.

PaddockStand · August 13th, 2012, 11:51 AM

Quote:

Originally Posted by Andy1199

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?

I don't think the cover is for heat, its probably to cut the mechnical noise coming from the engine.

PaddockStand · August 13th, 2012, 11:52 AM

Quote:

Originally Posted by Rich22

182BHP at the rear wheel.

Itching to see the finished product Rich.

MMC · August 13th, 2012, 12:14 PM

Whooo...me too!

wmcdonal · December 3rd, 2012, 12:20 PM

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.

TricoloreSF · December 3rd, 2012, 12:44 PM

Quote:

Originally Posted by wmcdonal

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.

+1

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August 9th, 2012, 12:42 PM	#22
Rich22 Senior Member Joined: Mar 2012 From: Uk Posts: 572 Thanks: 133	That's a mock up Today we hit 182 bhp with our test slip ons and the Rapidbike with some fuelling and ignition tweaks.

August 11th, 2012, 10:29 AM	#27
tbot Member Joined: Aug 2012 From: Denver, CO Posts: 98 Thanks: 8	BHP is brake horse power, which is always considered at the crank and not the wheel

August 13th, 2012, 06:23 AM	#28
Rich22 Senior Member Joined: Mar 2012 From: Uk Posts: 572 Thanks: 133	182BHP at the rear wheel.

August 13th, 2012, 12:14 PM	#31
MMC Junior Member Joined: Jul 2012 From: Alaska Posts: 22 Thanks: 0 I Ride: 1199 Tricolore, '12 MTS Pikes Peak	Whooo...me too!

December 3rd, 2012, 12:20 PM	#32
wmcdonal Member Joined: Dec 2012 From: Australia Posts: 61 Thanks: 52	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.