ZR1 dyno?
#1
ZR1 dyno?
Can anyone explain to me how the ZR1 loses 100hp and 100ft lbs of torque on the dyno? Please?
I thought normal loss between flywheel and tires was at max like 50hp on a car...
I thought normal loss between flywheel and tires was at max like 50hp on a car...
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when you're making more power you're going to be applying more torque to the transmission gears and the rearend, causing losses through friction
when you dyno it especially on an inertia dyno like a dynojet more power will be lost trying to accelerate everything at a quicker rate
think of flywheel, tires, rotors, ring and pinion, transmission etc etc
the loss is always going to be a percent you cannot just say that
T56+aluminum DS+ billet flywheel+10bolt+17inch wheels and tires = 30 hp no matter what
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#10
The percentage power loss through a drivetrain is not determined by RWD or FWD alone, it is the actual type of transmission that says it a lot more.
A manual car will have less drivetrain loss as it is a direct connect, ie all moving parts are mechanically linked. Any automatic type car will lose more power as it uses fluid flow to transfer power which means more power loss. Expect an average of 25% give or take depending on the transmission used and its efficiency. While a manual will be in the 15% range.
A manual car will have less drivetrain loss as it is a direct connect, ie all moving parts are mechanically linked. Any automatic type car will lose more power as it uses fluid flow to transfer power which means more power loss. Expect an average of 25% give or take depending on the transmission used and its efficiency. While a manual will be in the 15% range.
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It comes down to friction, and the weight of the components like stated above. if you want to bring that percentage down though, you can get lighter driveline components, and for example, with a T56, you can get your internals micropolished, or mikronited(As well as rear gears), and in combination with a good fluid, you can reduce friction.
Our 02 WS.6 made 351rwhp/372rwtq with a built (completely micropolished internally) t56, a lid, catback and 3.73s. The only thing i could think of, that it was makin that much power was the reduced friction in the trans. I at first thought it was a high reading dyno, but our other car, after being tuned, only dyno'd 6hp higher on this dyno than a mustang dyno.
Our 02 WS.6 made 351rwhp/372rwtq with a built (completely micropolished internally) t56, a lid, catback and 3.73s. The only thing i could think of, that it was makin that much power was the reduced friction in the trans. I at first thought it was a high reading dyno, but our other car, after being tuned, only dyno'd 6hp higher on this dyno than a mustang dyno.
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Pretty sure the percent figures are just to help get an estimate and nothing stays "locked" to that percentage. If you have a certain drivetrain it is going to take a certain amount of HP to spin that drivetrain(ie: clutch, tranny, driveshaft, rear-end, wheels). Then, if you increase your engine HP it is not going to magically be harder to spin that same drivetrain just because you have more horsepower. If you truly have a 15% drivetrain loss and have 400HP that is 60HP that it takes to drive the wheels. But if you have 600HP 15% is 90HP, why would it suddenly take 30 more HP to turn the same drivetrain?
Last edited by wht01ws6ta; 12-11-2008 at 08:59 AM.
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Pretty sure the percent figures are just to help get an estimate and nothing stays "locked" to that percentage. If you have a certain drivetrain it is going to take a certain amount of HP to spin that drivetrain(ie: clutch, tranny, driveshaft, rear-end, wheels). Then, if you increase your engine HP it is not going to magically be harder to spin that same drivetrain just because you have more horsepower. If you truly have a 15% drivetrain loss and have 400HP that is 60HP that it takes to drive the wheels. But if you have 600HP 15% is 90HP, why would it suddenly take 30 more HP to turn the same drivetrain?
this is why a high hp racecar gains more power from small things that don't make much difference on street cars (full roller rockers, lightweight gears, and other low friction parts)
on a street car those parts could be worth 2-3hp each, but on a full race car they would be worth much more...making the high cost of those parts worth it
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yes, actually it does become harder to spin those same parts...confusing I know but there is no set number for a t56 transmission to eat up, it depends on the forces being applied, just do some research on it
this is why a high hp racecar gains more power from small things that don't make much difference on street cars (full roller rockers, lightweight gears, and other low friction parts)
on a street car those parts could be worth 2-3hp each, but on a full race car they would be worth much more...making the high cost of those parts worth it
this is why a high hp racecar gains more power from small things that don't make much difference on street cars (full roller rockers, lightweight gears, and other low friction parts)
on a street car those parts could be worth 2-3hp each, but on a full race car they would be worth much more...making the high cost of those parts worth it
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Pretty sure the percent figures are just to help get an estimate and nothing stays "locked" to that percentage. If you have a certain drivetrain it is going to take a certain amount of HP to spin that drivetrain(ie: clutch, tranny, driveshaft, rear-end, wheels). Then, if you increase your engine HP it is not going to magically be harder to spin that same drivetrain just because you have more horsepower. If you truly have a 15% drivetrain loss and have 400HP that is 60HP that it takes to drive the wheels. But if you have 600HP 15% is 90HP, why would it suddenly take 30 more HP to turn the same drivetrain?
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its fairly simple physics really. you know that HP is a rate of how fast acceleration takes place. so it can be understood that it takes more hp to spin the items in the drivetrain as well as more hp to propel the car forward at increased rates of acceleration.
it's using 30 more hp to spin the same components because it's spinning them FASTER.
it's using 30 more hp to spin the same components because it's spinning them FASTER.