Just curious what everyone thinks the average loss of power from the engine to the rear wheels would be for a Gen II viper. Do you think it would be around 13% - 15% depending on the car?
Rev
Last edited by RevHeat : April 20th, 2006 at 08:05 PM.
the closest formula that seems to work pretty well between an engine dyno and a dynojet both SAE corrected on a Gen 2 is this:
rwhp + 10hp/0.88 = flywheel hp close enough
hp - 10hp x 0.88 = rwhp
So 500hp = 431rwhp (500-10 x 0.88) and 431rwhp = 500hp (431 + 10 divided by 0.88)
in this example it is 13.8% loss - but that percent will change with power levels as it is not constant.
This drivetrain loss formula is not perfect - but has been closer than anything else I've seen on a Viper. It will be different for anyone running an auto or significant drivetrain mods/unsprung weight mods obviously.
Very intersting, I was just curious since I have my Gen II dyno on a dynojet a few months back and got 442 rwhp. I was just curious what my engine hp might be.
Thanks Torque! Yea, its nice to say that you have over 500 hp at the engine. Only modifcations are K&N Filter assy. and Borla cat back system. Car does have 3.55 gears also. Its a 96 GTS.
Maybe Cody from A.R.T. can tell me what his old 06 Z06 dyno numbers were since I would love to compare my number to that car?
I don't think the driveline loss is very substantial on a Gen 2. They have next to no driveshaft at all, and the IRS is fairly efficient. The only thing taking away a decent percentage of power at the wheels are the wheels itself. Spinning those 13" wide wheels, and those big 335's out back, account for a great deal of the losses.
Very intersting, I was just curious since I have my Gen II dyno on a dynojet a few months back and got 442 rwhp. I was just curious what my engine hp might be.
Appreciate the post back Torquemonstor.
Rev
i only got 445/486 with headers, no cats and borla cat back on my 97 gts
Sean Roe conducted the sort of test that we all wish someone had done. He had a blueprinted stock motor for his World Challenge GTS dyno'd on an engine dyno. He then bolted it in the car and ran it on a chassis dyno. As I recall, the calculated driveline loss was 12.7%. I don't recall if it was a '97 or '98 GTS.
At least for the Gen 2, you can consider the case closed.
Sean Roe conducted the sort of test that we all wish someone had done. He had a blueprinted stock motor for his World Challenge GTS dyno'd on an engine dyno. He then bolted it in the car and ran it on a chassis dyno. As I recall, the calculated driveline loss was 12.7%. I don't recall if it was a '97 or '98 GTS.
At least for the Gen 2, you can consider the case closed.
Sean Roe conducted the sort of test that we all wish someone had done. He had a blueprinted stock motor for his World Challenge GTS dyno'd on an engine dyno. He then bolted it in the car and ran it on a chassis dyno. As I recall, the calculated driveline loss was 12.7%. I don't recall if it was a '97 or '98 GTS.
At least for the Gen 2, you can consider the case closed.
I guess that means I am around 498 at the engine, I am just going to go with 500 hp
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