The new CF driveshaft

**raventare** · 07-26-2012, 07:20 AM

Just so anxious I had to post...the new CF driveshaft will be installed today...more info to come.

**raventare** · 07-26-2012, 03:01 PM

As it dribbles in I will post but so far the shaft is 50% lighter and measures 2HP on the Dyno...more to come.

**gianni@brzclub** · 07-26-2012, 10:34 PM

Traveling and lack of internet has limited my ability to share information.

So pictures will happen next week and hopefully video too!

Current information:

Original drive shaft - 2 piece - 24 lbs.
CF Drive Shaft with aluminum ends - 1 piece - 12 lbs.

Stock dyno HP: 172 HP
w/CF drive shaft: 174 HP

The CF drive shaft fit without any issues, but we shaved down one stud an 1/8th to make sure the clearance was perfect.

Said benefits to having a CF drive shaft: Improved throttle response, more power, lighter weight and can withstand gobs of power.

Driving the car: I can't say that I feel any major difference, but the numbers don't lie and it is awesome to have. Too bad the beautiful piece of carbon is hidden from view.

Thank you to raventare, Power Train Industries and Import Auto Pros!

**gianni@brzclub** · 08-07-2012, 01:08 PM

Pictures!

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**JimLill** · 08-07-2012, 02:55 PM

While without a doubt the weight reduction and rotational mass reduction are worthwhile. But, The 2 HP difference on a dyno isn't really a good way to assess the value. !st, 2 HP is within a window of short term repeatability error. 2nd, like any reduction in rotational mass, the most beneficial gains are transient ones, something that a dyno doesn't measure quite right.

Bigger question... how much?

Related reading -> http://www.w8ji.com/rotating_mass_acceleration.htm

**raventare** · 08-08-2012, 05:16 AM

Great reading but what about rotational balance, strength, torsional rigidity and reduction of not only total weight but also numbers of moving parts. It is obvious that this is not the biggest performance gain to be gotten but the forces applied are not constant and thus every change in force causes an equally minute gain...as stated, something the dyno (and the posted formula) doesn't measure.

The bigger answer...time.

Again, GREAT reading and important reading for making changes.

**gianni@brzclub** · 08-08-2012, 05:49 PM

Originally Posted by JimLill

While without a doubt the weight reduction and rotational mass reduction are worthwhile. But, The 2 HP difference on a dyno isn't really a good way to assess the value. !st, 2 HP is within a window of short term repeatability error. 2nd, like any reduction in rotational mass, the most beneficial gains are transient ones, something that a dyno doesn't measure quite right.

Bigger question... how much?

Related reading -> http://www.w8ji.com/rotating_mass_acceleration.htm

I totally agree that the 2HP could have just been from one run vs the other and had nothing to do with the drive shaft, but it still needed to be tested. I think the benefits, like you said, are there, but not noticeable at this time.

After putting another 1,500 miles on the car, it feels great and I have no complaints.

Price is still something being worked out. I am sure it is around $1,000+