PST Carbon Fiber Drive Shaft Installed

[RallySport Direct]

Originally Posted by kmbkk

Dang, Zach, you're making it hard to say no. Unfortunately I won't be able to get a before and after comparison, stock. I'm getting the car back with a turbo kit & exhaust installed and tuned. However, I don't doubt what you say. Thanks again

Awesome! It will be even better with the turbo kit!


Thanks,
Rick

[gmookher]

Has this been tested under FI application? Hint, I do testing, and product reviews, and am a paying early adopter, sent you pm.

[twincamRob]

Originally Posted by mike2100

1100 bucks to lose over 10 lbs rotational mass. That's bordering on reasonable

Dunno if anyone caught it but it's not a 10lb loss in rotational mass, I'd say pretty much all of the weight loss is from ditching the carrier bearing which the bulk of it isn't rotating...

[RallySport Direct]

You want an AT driveshaft? Here you go....

http://www.ft86club.com/forums/showt...679#post577679

-Zach

[Captain Insano]

You are so awesome.

[Captain Insano]

Originally Posted by twincamRob

Dunno if anyone caught it but it's not a 10lb loss in rotational mass, I'd say pretty much all of the weight loss is from ditching the carrier bearing which the bulk of it isn't rotating...

No I didn't catch this. Please elaborate as I thought and it appears as though all of the weight loss would be rotational due to difference in weight between CF and the OEM DS material.

[twincamRob]

Originally Posted by Captain Insano

No I didn't catch this. Please elaborate as I thought and it appears as though all of the weight loss would be rotational due to difference in weight between CF and the OEM DS material.

Take a look at the stock driveshaft setup. In the middle, well more towards the front, there's a large bearing that bolts to the body. That's the carrier bearing and it weighs a good bit. Since this piece doesn't rotate but is still a part of the driveshaft it is easy to make a lighter shaft when you make it a one piece, or, without a carrier bearing. But the weight loss isn't as beneficial as you would think, obviously.

[Captain Insano]

So you think all 10 lbs of weight loss is in the carrier bearing. Not a couple pounds, but all 10.

Also besides weight, you don't think the elimination of the driveline friction associated with that bearing is a good thing?

[RallySport Direct]

Originally Posted by twincamRob

Take a look at the stock driveshaft setup. In the middle, well more towards the front, there's a large bearing that bolts to the body. That's the carrier bearing and it weighs a good bit. Since this piece doesn't rotate but is still a part of the driveshaft it is easy to make a lighter shaft when you make it a one piece, or, without a carrier bearing. But the weight loss isn't as beneficial as you would think, obviously.

I see what you are saying, but I respectfully disagree.





I was not able to remove the carrier bearing to weigh it, but there is not much to it. It is just two metal rings (1/8" thick each) with a bracket and rubber in the middle. I estimate the carrier bearing to be about 2 lbs. (If anybody has the actual weight, then please post it.)

The heaviest parts around the bearing are going to be the U joint and flanges, which are part of the rotational mass. The one piece design of the CF shaft eliminates the middle U joint, flanges and carrier bearing, which reduces overall weight as well as rotational mass.

-Zach

[Captain Snooze]

@ RallySportDirect
Silly question I know but what are the operational temperature limits? That is, at what ambient temperature is there a reduction in the strength of the shaft?

[RallySport Direct]

Originally Posted by Captain Snooze

@ RallySportDirect
Silly question I know but what are the operational temperature limits? That is, at what ambient temperature is there a reduction in the strength of the shaft?

PST has not found any ambient temperature limits or reduction in strength. The only temperature issue would be the exhaust being routed too close to the shaft and overheating it (approximately 450*F). These shafts are very durable and I have not seen a problem with any of them.

-Zach

[TuxedoCartman]

Originally Posted by RallySport Direct

PST has not found any ambient temperature limits or reduction in strength. The only temperature issue would be the exhaust being routed too close to the shaft and overheating it (approximately 450*F). These shafts are very durable and I have not seen a problem with any of them.

-Zach

Is the stock exhaust too close, in that regard? I notice in a lot of pictures the midpipe sits awfully close to the driveshaft.

[RallySport Direct]

Originally Posted by TuxedoCartman

Is the stock exhaust too close, in that regard? I notice in a lot of pictures the midpipe sits awfully close to the driveshaft.

The stock exhaust and almost all aftermarket exhausts will not affect the driveshaft. The shaft will not see much heat while driving and the exhaust will not be warm enough to have a negative effect while idling.

-Zach

[TuxedoCartman]

Originally Posted by RallySport Direct

The stock exhaust and almost all aftermarket exhausts will not affect the driveshaft. The shaft will not see much heat while driving and the exhaust will not be warm enough to have a negative effect while idling.

-Zach

Cool. I'm sold... order placed!