Just curious what the overall benefit was of an aluminum driveshaft-just lighter so there is less weight to spin? How much lighter are they? Thanks in advance for any info. Have a good one-

 

Less rotational mass = less vibration at higher rpms and speed

 

are they worth it?

 

are they stronger then stock . i tend to think they wouldnt be. took a **** load of coke cans to make that drive shaft thats all i think about. lol ill be going with a heavy duty steel driveshaft myself.

 

For a street car it will reduce or eliminate any driveline vibration. Forget about using a factory aluminum driveshaft if you intend to race. It won't last. I use a 3" x .083" steel shaft in my race car.

 

for a weekend warrior street car that is slightly modified to say no more then 300 or so horsepower i think they are nice...the extra weight you save in rotational mass is really felt in throttle response. if you get a deal on one or for even a $100 or so it's not a bad little improvement over the stock heavy piece.

if you plan or have any real power in the car though i'd advise against it....that or be sure to have a driveshaft loop. i twisted mine with only 300 horse and stock torque.

 

I would say that the AL driveshaft would be fine for an A4 because you are not dropping the clutch at 5000+ RPM and shocking the system that much.

 

For a street car the Aluminum dr shaft is lighter by 4 lbs, less vibration at high speeds, spin up faster. Or in other words not much of a performance increase. But I do have a 1LE aluminum dr shaft on my car. Its just a nice upgrade over the stock steel one.

 

I've got a 3 1/2" aluminum driveshaft in my TA that is pushing over 400 RWHP (should be higher with new cam and heads). I've never had a problem with it. Just use good U joints and yoke and have it balanced.

 

This is a factory aluminum driveshaft-I planed on having it balanced-I hope to have 400-425 hp-is this too much for that aluminum driveshaft? Opinions please!

 

Well, if I were to run a M5 like your sig, I would check the DS every now and then for twisting. Say at the end of every season?

 

as long as those number are at the crank, then yes! through some sticky tires and i'd say otherwise........

 

Yah but if he drops the clutch at 5500, that would shock the hell out of the drivetrain and that could be a problem. I would certainly get a driveshaft loop.

 

yes, either way with good power you should have one for safety.

 

Nah, you'll snap the 7 1/2 rearend before you break a driveshaft.