Sam

Hey Guys, its been a while since i've posted something.. so while reading some paragraph over the web something caught my attention...
The thing is that many z32 owners love there aluminum driveshafts..
here is what i read.
"ACPT has developed a carbon fiber driveshaft that allows a 1000 RPM increase in the engine speed and gives the engine a chance to work at its’ power peak. Its track tested at well over 800 horsepower. Its a stronger,lighter, direct replacement for your stock aluminum driveshaft.Which are known to twist.
You can achieve rear wheel horsepower gains of more than 5% with the simple switch to an ACPT carbon fiber driveshaft"

Is that true ??

Mrmoose

Twist? Maybe I you are making bogs of power and launching from a stop... As for the hp gain, it wouldn't be enough to notice or feel. Do you think that a pound or two lighter drive shaft really adds hp? Maybe reduces inertial weight but hp gain? Just like a light weight clutch, spins fatser quicker but no hp gain. Idk that's my 2c, plus it's 1k!....

ZLover4Life

You will never twist the stock driveshaft. I don't even think the stock driveshaft is aluminum...

Furthermore, no one-piece driveshaft can handle the rotational speeds of a two-piece.

http://twinturbo.net/net/viewmsg.asp...msg_id=2391438

Piece of advice - quit going anywhere other than TwinTurbo.NET for your info.

hoov100

I'm not too sure about the accuracy of that statement, what evidence do you have that supports it?

From what I have seen, most driveline shops balance there shafts to anywhere from 5-9k RPM depending on what you plan on doing with it. Now I don't think I would see many cars driven by the wheels spinning any driveshaft faster then 9k RPM. (also didn't the jun-blitz z32 that hit 260mph have a one piece?)

ZLover4Life

Did you not read that thread? Read everything I say and all included links long before responding next time, please.

Thanks for playing.

domsgarage

its already refreshing to read a zlover response.

xpwarrior

Well I was under the Z today so I measured the Z1 driveshaft and it's 3" steel with a length of 46". That puts the critical speed at 8200 rpm so in 5th gear that would limit engine speed to 6166 rpm.

Top speed before the driveshaft comes apart with the 4.10 NA rear would be around 146 mph and for the 3.692 TT rear 162 mph. That's with 245/45-16 tires.

I think I will be OK since I don't intend to ever get close to 146.

This is the only reason I have seen so far to keep the stock 2 piece. NVH hasn't been a problem with the Z1 shaft. The u-joints and the carrier bearing being bad were the reason I went with the 1-piece. I have since found a source for u-joints for the original driveshaft. Would be a little bit of work to convert from the staked joints but doable.

KasbeKZ

i've gone as fast as i care to with my Z1 ds and have no issues to speak of. i still stand by 1- pieces.

as for the original question, CF isn't the way to go. case closed.

Sam

Okay i guess they meant the 1pc aluminum driveshafts...
Anyway so you are w/ the stock 2pc driveshaft..
and KasbeKz is with the 1pc driveshaft..

So what's the way to go ?

domsgarage

I have the one piece, over 60k on it, never had an issue with it so far.

There are benefits to each, as you've clearly read, so just pick one.

ZLover4Life

You can be a big boy and make the decision between 2 piece and 1 piece.

There is a much higher risk of vibration with the 1 piece, and virtually no benefits to having it, so just be aware of that.

Sam

Well simply i would spend the money for a underdrive pulley + overdrive pulley and stick with the stock 2 pc

Future_gohan

I doubt the driveshaft is any better than a steel one piece driveshaft, i would never put out the extra money for that bs.