Quote:
Originally Posted by Kingtal0n
the idea is to reduce rotating weight. Same idea as lightweight flywheel, or lighter wheels. It means more power makes it to the ground. I know I said power, but you can call that torque if you want.
the negative side to using any lightweight part, is that there is less energy stored inside rotating parts (but you JUST said that was a positive... ) It means that the engine will have to produce more torque on demand and rely less on rotating intertia stored in the parts.
Ill give you an example. Imagine your flywheel weighs 100lbs. Yes turning it will be difficult, slow, and it will take a long time to get the RPM up. But once the RPM is there, you can dump the clutch and the car will rip the tires apart because that flywheel is not stopping.
On the other hand, if the flywheel weighs 1lb, it will spin really easy. You can get that thing up to 7,000rpm in a split second if you want. but when you dump the clutch the rpm is just going to drop and the engine will stall because there is no energy stored in the flywheel.
A nice cross makes a proper car. if you are strictly drag racing then mostly lightweight parts is fine. But if the car is a daily you want it to be easy to leave stoplights, which means you probably want to keep mostly stock-weighted parts. One or two lightweight components is ok but the more you add the more finicky the car will be leaving lights.
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I found this to be a very succinct and helpful way to describe weight reduction stuff. I had the concept worked out in my head but explaining it simply can be difficult.
Quote:
Originally Posted by S14DB
Exactly. There are no negatives to loosing mass after the transmission.
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Yea, but I think he was just attempting to explain what taking out rotating weight does in general, not specifically a driveshaft. The inertia of the driveshaft still applies when the clutch is engaged. Right?
EDIT: Also I had a DSS steel one piece driveshaft in my RB25 S13. I didn't notice any sound, but then again I was going from SR to RB and have nothing to compare the RB with steel driveshaft to personally.