Z1 Motorsports clutch and ultra light flywheel
02-20-2007, 12:09 PM
#41
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Originally Posted by MIAPLAYA
What mods were on the car for this dyno? Notice how different the torque looks from the current one? I still don't see gaining that much power from just a flywheel..
The dyno sheet you are looking at was stock + Injen CAI. Since then, I have added test pipes and Kinetix V+ plenum.
Brian
02-20-2007, 12:14 PM
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Originally Posted by MAC-G35
The dyno sheet you are looking at was stock + Injen CAI. Since then, I have added test pipes and Kinetix V+ plenum.
Brian
Brian
02-20-2007, 12:25 PM
#43
scaled...
I still don't think this is an accurate power gain though. Something else is coming into play - engine temp, A/F ratio, tune, ambient temp/humidity, ECU timing map, reset ECU, maybe the first run had the AC turned on, dyno's correction factors, possibly the new fluids made a 1-2 hp difference, etc
I still don't think this is an accurate power gain though. Something else is coming into play - engine temp, A/F ratio, tune, ambient temp/humidity, ECU timing map, reset ECU, maybe the first run had the AC turned on, dyno's correction factors, possibly the new fluids made a 1-2 hp difference, etc
Last edited by sentry65; 02-20-2007 at 12:40 PM.
02-24-2007, 12:08 PM
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Originally Posted by zman1910
Where in the world did you get the math from? Your basically saying there is a 50% drivetrain loss...when in actuality its probably less than 20%
23whp X 1.20 (or 120%) = 27.6 crank hp
23whp X 1.20 (or 120%) = 27.6 crank hp
23whp/0.8 = 28.75 crank hp.
02-24-2007, 02:58 PM
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Great job by the Z1 crew for developing a truely useful upgrade!
A lightweight flywheel will not show its true potential on a dyno, it shows it when you drive. Here are a few quotes from Carroll Smith:
"In order for the race car to accelerate the engine must accelerate. ... In low gear the energy required to accelerate the racing engine components can approach thirty percent of the engine's dyno output-trailing off to something less than eight percent in high gear....So what do we do about it? Within the bounds of sanity, the biggest single improvement that can be made in this department is to reduce the mass and the moment of inertia of the flywheel and clutch assembly."
What he is basically saying is that you will feel more gains from the lightweight flywheel in the lower gears than you will in the high gears. Since the dyno is taken in a high gear - it will not show the true benifits. Therefore, dyno's are not the right place to judge a flywheel, you need to take it to the track and test the differences.
A lightweight flywheel will not show its true potential on a dyno, it shows it when you drive. Here are a few quotes from Carroll Smith:
"In order for the race car to accelerate the engine must accelerate. ... In low gear the energy required to accelerate the racing engine components can approach thirty percent of the engine's dyno output-trailing off to something less than eight percent in high gear....So what do we do about it? Within the bounds of sanity, the biggest single improvement that can be made in this department is to reduce the mass and the moment of inertia of the flywheel and clutch assembly."
What he is basically saying is that you will feel more gains from the lightweight flywheel in the lower gears than you will in the high gears. Since the dyno is taken in a high gear - it will not show the true benifits. Therefore, dyno's are not the right place to judge a flywheel, you need to take it to the track and test the differences.
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