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Old 01-21-2010, 03:35 PM   #1
youngengines
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Default HP loss through drivetrain

Does anyone know what % horsepower loss there should be in a oval track car with a saginaw 3 speed (running in high gear) with a quick change rear? Its a limited dirt car 355ci 350 350heads no porting cut to 52cc, solid cam performer rpm intake etc. We got one that showed 340hp at the wheels, was expecting more.
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Old 01-21-2010, 04:12 PM   #2
little duece coupe
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Default Re: HP loss through drivetrain

my guess would be about 12%
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Old 01-21-2010, 08:58 PM   #3
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Default Re: HP loss through drivetrain

Quick Change gives you an extra set of gears to rob power.
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Old 01-21-2010, 09:36 PM   #4
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Default Re: HP loss through drivetrain

Quick change is the only rear that has the main power robing component set DEAD center and should be better as per hp loss then any other rear....

I would believe the loss as per the additional bearing and gear is far less then the position in a 9"...
Though i could be wrong, i really don't see the quick change as the problem.

Could be many things robbing hp, wide 5 or conventional hubs, drilled axles or not, Al shaft or steel, more then 0 degree on the shaft, thick oil, cold oil temp, non syn oil, grease...
When you are playing with looking for every fractional piece of hp, every single part needs to be seriously played with/lightened, including oils and the temp of the oil..
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Old 01-22-2010, 10:28 PM   #5
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Default Re: HP loss through drivetrain

Will the gear ratio change the readings on a chassis dyno? I've heard both ways. This car had a very low gear for a liitle dirt track, It was a 7.3? ratio. After the dyno session, which the car showed VERY rich, and they leaned it out a LOT they qualified 4th out of I believe 16 cars. He won the race, and afterwards had to pull a head for tech (it was a big race) found a plug was burned up! I told em that chassis dyno is different from the cool night air on the track!
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Old 01-23-2010, 09:29 AM   #6
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Default Re: HP loss through drivetrain

If you were to dyno again with a different gear (like if you changed the gears to go from 3.70 to 4.30) it would change, usually going from low to high (numerically) makes it lower.
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Old 01-23-2010, 09:42 AM   #7
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Default Re: HP loss through drivetrain

Thanks for the input guy's!
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