From what I have read, it is said that for every one pound of rotational weight relieved from the drivetrain, you regain 2.5 horsepower. Don't know if it's true or not. Any body have any experience with either of these? If so, what kind of gains/detriments could be expected if I were to install them on my car? 1985 SVO with all of the basic stuff, 35# injectors, 3in. exhaust, LA3, A237 cam, 20+ psi, and a TC intercooler. I've got a fmic and alky system that is going to be installed in some free time over the winter.

 

I've put a Aluminum driveshaft in every RWD I owned that didn't allready come with one. It's well worth the money and you can feel a difference.

As for using a lightweight I might stay with the stock one with the SVO engine. You may not like the way revs go up and down so quickly.

 

I have an aluminum fly wheel and driveshaft. I had my 02 GT on Dyno after the installation and it yielded only 7.2 rwhp. The real benefit is reduced vibration. The downside is premature clutch wear. Aluminum Flywheels require more RPM to get off the line than steel flywheels.

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I don't think that will bother me. The SVO seems to rev really slowly anyway, and when I'm not driving it I'm driving a turbo Sentra and that thing revs really quickly.

I thought that 2.5 for every pound seemed awfully optimistic. I did the math and it said that the difference in weight would be 40hp and that seems unrealistic. I think that my stock clutch will see an upgrade in the future too. Can an upgraded clutch help offset the premature wear?

 

That is a good question. One for JD1969 -- the chief administrator.

 

The power gained per lb removed can't be a flat number like 2.5. If you recall physics & inertia, the effect has a lot to do with how FAR AWAY from the center point of the rotation the weight is, will make a bigger difference. Meaning, remove 10 lbs of weight that is 1 foot away from the center of the drive line axis will have a noticeable effect. But, remove 10 lbs of weight from the center point of the drive line rotation & you'll get NO improvement at all.

And remember a Flywheel exists & has weight for a reason. It smooths out the torque between shifts & when you leave from a dead stop. It's a lot easier to stall a car from a stop that has the lighter flywheel. No biggie if you're good at shifting, but if your new to standard trannies then a light flywheel will **** you off

 

That does make alot of sense. But I would think for a driveshaft, at one end it would make a big difference, the other very little. I wonder if they just kind of averaged the two out to make up a number?