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Drivetrain power loss
Instructor
Joined: Sep 2020
Posts: 200
Likes: 76
Le Mans Master
Joined: Dec 2017
Posts: 5,563
Likes: 3,304
From: Virginia
2021 C5 of the Year Finalist - Modified
St. Jude Donor '21-'22
A differential brace will help some. You'll never get rid of all drivetrain parasitic loss. You're going to want a diff brace anyway with the power levels that you're looking to have.
Race Director
Joined: Oct 2004
Posts: 12,860
Likes: 4,661
Any time you turn power, physics enters the equation, and power in the new direction will be less. On our cars, the power is delivered front to rear through the diff pinion. The power is then turned 90° thru the ring gear. It's lost motion, plus frictional losses. This is why a front wheel drive car gets better mileage and delivers more whp, all else equal, compared to a front engine/rear wheel drive layout. In the FWD layout, power is never turned, except when the drive axles have been pushed all the way to the suspensions limits of travel, which shouldn't be often, lol. If we could put our LS motors in the rear, and mount them in a transverse way, whp would go up dramatically.......
Last edited by grinder11; Oct 15, 2021 at 01:31 PM.
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
Drivetrain losses are pretty much set from the factory. In order to change drivetrain loss you need to decrease friction in the engine block between the pistons, rods, cylinder walls, transmission gears, rear gears, etc. You would need to rebuild the whole engine and drivetrain.
If you're talking reducing drivetrain inertia then you can go with lighter pulleys, electric water pump, aluminum fly wheel, carbon fiber or aluminium driveshaft (instead of torque tube), lighter wheels and tires, lighter brake assemblies etc..
If you're talking reducing drivetrain inertia then you can go with lighter pulleys, electric water pump, aluminum fly wheel, carbon fiber or aluminium driveshaft (instead of torque tube), lighter wheels and tires, lighter brake assemblies etc..
Last edited by Johnny Hardcore; Oct 15, 2021 at 10:42 PM.
Drifting
Joined: Jul 2015
Posts: 1,844
Likes: 375
From: San Jose, CA
As mentioned above, lightness and stiffness is usually the way to do it. A light clutch assembly, carbon fiber prob shaft, aluminum couplers, that would do some work for you. And yes, under-driving your accessories will give you a few smidgens of horsepower too.
Unless you have very specific requirements this is not an avenue worth pursuing.
Unless you have very specific requirements this is not an avenue worth pursuing.
Melting Slicks
Joined: Dec 2004
Posts: 2,847
Likes: 1,144
From: Sleepy Hollow- NJ
As mentioned above, lightness and stiffness is usually the way to do it. A light clutch assembly, carbon fiber prob shaft, aluminum couplers, that would do some work for you. And yes, under-driving your accessories will give you a few smidgens of horsepower too.
Unless you have very specific requirements this is not an avenue worth pursuing.
Unless you have very specific requirements this is not an avenue worth pursuing.
I had to change mine out because the bell on on my GM pump cracked and got ripped off by the procharger belt. (2nd time in ECS history they've seen this happen. Of course I was that second time).
I wouldn't have proactively made that change though. $800 for a meziere pump would not have been proactively done as a power booster.
Last edited by Johnny Hardcore; Oct 16, 2021 at 08:07 AM.
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