ls1 driveshaft?
I wouldn't think you could see to much on et or rwhp but weight wise I would say around 20lbs of rotating mass but please don't quote me since I have only held each one in my hand and never wayed. The key advantage to the swap is the weight reduction and it gets rid of the annoying vibes everyone experiences at 100+mph...
and also i was told by an older man who used to race quiet a bit in his younger days that every pound of rotational mass is equal to something like 5 or 10 pounds of dead weight. correct me please so i can remember the correct number this time.
An LS1 driveshaft is about 5 or 6 pounds or so lighter than stock Lt1 steel. Being that the body of it is so skinny (3 or 3.5in. I do not recall) the typical 1 pound=~10 pounds rotational mass does not really apply unlike it would for a larger diameter flywheel in which it would definetly apply. Essentially the car is losing about 5lbs. overall and freeing up 1-3hp. Although it wont show any gains at the track I feel for $100 its worth using not only for a little bit of weight reduction but for smoothness over the stock driveshaft at highway speeds.
http://www.ws6.com/mod-1.htm
It's all about the faster acceleration, not peak HP increases.
The reduction in rotating mass had a pretty significant effect on the torque curve down low
It's all about the faster acceleration, not peak HP increases.
The reduction in rotating mass had a pretty significant effect on the torque curve down low
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I think the main goal is to get rid of the annoying vibration the stock unit causes above 80mph. No one really looks at the gains to be had, good dyno graph tho. Makes sense on the tq gains, since the ls1 shaft spins easier.
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Verdad Gallardo Vibrations are gone and it felt a ton lighter, but at the track it wasnt noticable. The car used to vibrate real bad anywhere past 80-90mph, now its smooth as silk no matter how fast i go. totally worth it even if it doesnt help at the track. On a dyno maybe?
thats what i thought, and i thought the rotational mass rule applied to anything being spun by the motor not just the flywheel, i mean just think about it in lamest terms, like a heavier rim, or drive shaft, its like when youre at the gym next time try this, put some 45lber's on the olympic bar and rotate the bar in your hands, now put 10's on and rotate the bar, you can get it spinning much faster in a shorter amount of time with the 10's becuase it weights less. so wouldnt the rotational mass theory typically apply here?
thats what i thought, and i thought the rotational mass rule applied to anything being spun by the motor not just the flywheel, i mean just think about it in lamest terms, like a heavier rim, or drive shaft, its like when youre at the gym next time try this, put some 45lber's on the olympic bar and rotate the bar in your hands, now put 10's on and rotate the bar, you can get it spinning much faster in a shorter amount of time with the 10's becuase it weights less. so wouldnt the rotational mass theory typically apply here?
rotational mass will apply to anything moving, wheels, flywheel, driveshaft etc. but it wont apply as much to a 3in. driveshaft as it will to say wheels. Unlike wheels or a flywheel, driveshafts don't have the diameter to have much effect on reducing rotational inertia (reducing the motor's effort to spin up the shaft) so the weight savings is mostly in how much lighter the new ds is to the stock ds.
but all very good valid points, and really the shaft is for less vibration cause if you were looking to shed some weight you could buy an expensive *** carbon fiber drive shaft or something.
DAMN WELL THEN 18LBS, I WAS JUST GOING BY WHAT SOMEONE HAD POSTED, SO I'D SAY 18LBS OR ROTATIONAL MASS FOR THE DRIVE SHAFT CONSIDERING ITS 3" HAS GOT TO BE CLOSE TO 50LBS OF DEAD WEIGHT.
this is pretty good useful information...i liked reading this thread
post up in the wanted section or go to the local junkyard and just ask for ls1 alum driveshaft...easiest way to get one...now you could go buy an aftermarket one for around 300+ if you have the money to blow
post up in the wanted section or go to the local junkyard and just ask for ls1 alum driveshaft...easiest way to get one...now you could go buy an aftermarket one for around 300+ if you have the money to blow