TravisMcGill2000

iTrader: (2)

how much gain do u c with a ls1 driveshaft over stock. rwhp and e.t and the weight difference. thanks guys

connexion2005

iTrader: (49)

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...

PNYKLR-TA

iTrader: (1)

i thought that was the only gain at first but i guess dude is right, if rotational mass is decreased, then weight is lost and therefor should yield some gains in the ET side of things, only because of lost weight, i wouldnt see how it would gain any rwhp being it is only lighter, and does not release more power.

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.

StealthFormula

iTrader: (35)

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.

James Montigny

iTrader: (13)

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

grossesexy

Incredibly useful dyno graph there James, thanks for posting that.

AChotrod

iTrader: (17)

I tested it. I didnt gain any MPH at the track. Although it was 2 different days.
I did run better the second time but it was in the 60ft. MPH was basically the same

kinglt-1

iTrader: (26)

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.

AChotrod

iTrader: (17)

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?

TravisMcGill2000

iTrader: (2)

k thanks alot guys worth a 100 bucks 2 me

PNYKLR-TA

iTrader: (1)

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?

CamaroRacing12

iTrader: (5)

yes it does,an ls1 driveshaft is a good and easy mod...

StealthFormula

iTrader: (35)

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.

PNYKLR-TA

iTrader: (1)

i see where your coming from as the diameter would affect it more along with the weight difference, but still the weight difference helps alot, i'd say taking 3lbs off of drive shaft has to equal at least taking 10lbs out of your car of dead weight.

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.

the_merv

iTrader: (88)

I weighed it at 12lbs, the stock one at 30ish.. there is more than a 5lb difference between the two.. easily..

PNYKLR-TA

iTrader: (1)

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.

the_merv

iTrader: (88)

Don't quote me on that either..that's roughly what they weighed on a digital scale. I'm just saying that there is easily more than a 5lb difference between the two..

camaro-94-z28

iTrader: (3)

where do you guys buy these driveshafts for 100$?

the_merv

iTrader: (88)

Classifieds..Ebay.. keep your eye's out..they are around.

jarretthise

iTrader: (9)

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