ACPT Carbon Fiber Driveshaft GP, This thing's a GO!!!! Options

[trackbird]

I know there was some interest in these on the board, and we have a thread about it in one of the forums right now. So, if anyone is interested.

I just hung up with ACPT. If we can GP 5+ of these, they will be $200 off of the regular $795 and $40 freight (48 states of the US only). Meaning, $595 each (plus shipping).

The tech info is this:

Aluminum yokes.
800 ft lbs torque rating
3 1/4" OD
12,500 RPM critical speed

For an additional $100 you can have (and I know you guys will love this one).....

3 3/4 OD
2000 ft lbs torque rating
14,500 RPM critical speed


Anyone interested?

[JKnight]

What are the benefits of a cf driveshaft over an aluminum one? Lighter, stronger?

Jason

[trackbird]

They are light (should be lighter than aluminum, I forgot to get the weight) and if they fail, they "broom" into a bunch of carbon fiber "shredded cloth" instead of punching holes in your floor, "pole vaulting the car" (if possible) or trying to remove the rear end from the car by catching on something. So, essentially, it's light, generates considerably less noise, vibration and such (NVH) and has a far safer mode of failure than a metallic shaft.

Here's more info.

http://www.acpt.com/driveshaft/driveshafts.html

[AndyJ]

I'm in.

Where do I send the money?

[trackbird]

I'm in.

Where do I send the money?

As soon as we get 5 buyers, you'll send it to me and I'll place the orders (like the wheel GP). Hang onto your cash for the moment, and I'll gather it up when/if we make the number (5).

Thanks Andy, 4 to go.

[94bird]

Well, as luck would have it I just brought my driveshaft in yesterday to get a stronger replacement made, so I'm not in the market, but I'm curious.

Is the 800 lb*ft TQ rating for the base driveshaft the TQ it can take at the driveshaft? If so, if we make 400 lb*ft TQ at the flywheel and 1st gear is about 3:1, I'm thinking the shaft goes poof into a cloud of dust.

[sgarnett]

Dang it! Dang it! Dang it! I'm tapped out ....

[trackbird]

Well, as luck would have it I just brought my driveshaft in yesterday to get a stronger replacement made, so I'm not in the market, but I'm curious.

Is the 800 lb*ft TQ rating for the base driveshaft the TQ it can take at the driveshaft? If so, if we make 400 lb*ft TQ at the flywheel and 1st gear is about 3:1, I'm thinking the shaft goes poof into a cloud of dust.

I got the impression it was flywheel torque, but I can verify that information. Also, since we don't see these things exploding on the various high HP cars they are under, that sorta verifies that feeling.

[94bird]

I agree, but I don't know how they can rate them for flywheel TQ, since the driveshaft shouldn't care at all about that. What if someone runs a different gear ratio in their transmission?

I suppose they sell these shafts in stock length with stock yokes so that makes it unlikely someone will do that.

[trackbird]

I agree, but I don't know how they can rate them for flywheel TQ, since the driveshaft shouldn't care at all about that. What if someone runs a different gear ratio in their transmission?

I suppose they sell these shafts in stock length with stock yokes so that makes it unlikely someone will do that.

On the other hand, 800 flywheel ft lbs is STOUT. I don't care how you slice it, it's going to put a large quantity of torque to the rear axle. Meaning, it should/would be more than enough for anything most of our mere "mortal" cars are making for hp and torque. But, I understand and agree with your point.

And, most F-body transmissions become a fuse at the 800 ft lb torque level. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/rotf.gif)

[TOO Z MAXX]

I am guessing these are not ESP legal. If they are legal I am in.

[trackbird]

I am guessing these are not ESP legal. If they are legal I am in.

I don't know, and my rulebook has expired (and I've not been ESP legal since week 3 of owning my car anyway).

Anyone know for sure?

[Foxxtron]

If allowed, I may be that "5th buyer" in case there is one more needed. I could always use a 3.25" driveshft for my daily driver car.

The current 3.45" on my track freak was one that I had opted for just so I could tinker with their consultants (a la me being the guinea pig while offering my recorded information just for their keepsake. This is the same deal that I did through Koni for me to convert my ASN's into rebound-only adjustibles. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/cool2.gif) )

[sgarnett]

Any driveshaft covered by update/backdate is legal in ESP, but nothing else is. No, it's not legal.

Well, as luck would have it I just brought my driveshaft in yesterday to get a stronger replacement made, so I'm not in the market, but I'm curious.

Is the 800 lb*ft TQ rating for the base driveshaft the TQ it can take at the driveshaft? If so, if we make 400 lb*ft TQ at the flywheel and 1st gear is about 3:1, I'm thinking the shaft goes poof into a cloud of dust.

I got the impression it was flywheel torque, but I can verify that information. Also, since we don't see these things exploding on the various high HP cars they are under, that sorta verifies that feeling.

Do we know which one is being used under those high hp cars? Hopefully they can clarify the rating.

[trackbird]

Do we know which one is being used under those high hp cars? Hopefully they can clarify the rating.

I'll call today.

[John_D.]

I have pitiful timing... I bought wheels from someone on here about one month before the wheel GP... and my ACPT driveshaft just arrived one week ago.... (IMG:http://www.frrax.com/rrforum/style_emoticons/default/sad.gif)


If I wasn't broke from this (re)build-up, I'd get a spare.

[trackbird]

You know, I though of doing this sooner, but decided that the thread didn't look like there were that many buyers. Jon A said his is in the brown truck right now and is headed to his house, you just got one, etc. I should have gone for it ASAP I guess.

As I said, you guys know I'll try to do these things for you, just ask.

[Rampant]

I would love to get in on this, but I do not think the small one is strong enough and the big one would not likely fit.

(IMG:http://usera.imagecave.com/Rampant/Dyno1.jpg)

I had another pull that spiked the torque to 775.

And the space under my car is limited with a 4" collector on my Y pipe.

(IMG:http://usera.imagecave.com/Rampant/motor-goin-in/ypipe.jpg)

I was planning on one this winter too. (IMG:http://www.frrax.com/rrforum/style_emoticons/default/dry.gif)



I'm sure that the 3 3/4 would never fit, the custom DOM steel one is relatively tight.


Is there a good technical contact there that might be able to help me find a solution?



Rampant

[trackbird]

I'd just give them a call.

And, what do you have in that thing to make that kind of power? (I'll probably be splitting this portion off later).

[Cal]

Hey where was this GP a couple months ago when I paid full price for one of these?

FWIW, I fit my 4 inch CF drive shaft next to my 4 inch collector by cuting the floor pan and welding in a new piece of sheet metal. This allowed me to move the exhaust an aditional 1.25" towards the passenger side.