ACPT Carbon Driveshaft Installed

[Sniper512]

Well I got it on today. I was very impressed with the weight of the shaft compared to the stocker. First impressions were good. The car felt much smoother and shifting felt much tighter. Acceleration seems more swift and the car revs much easier. Very happy with it.

[Jung]

any pics of the install?

[gaspeedracer]

^^^x2. it sounds like something i might have to pick up soon.

[Sniper512]

Nope sorry pretty simple to do though remove center section of exhaust, the heat sheild, remove center support bearing bolts, and unbolt the stock shaft and then your good to go. Do in reverse for install minus the support bearing.

[2871mds]

Nice what is the weight comparison? and do you have any before and after pics of this shaft?

[Overboostin]

how much did that run if you don't mind me asking?

[Sniper512]

I would say the stock shaft weights 20-25lbs and the carbon one weighs about 10-15lbs. From what I researched its not just about the weight savings. The one piece is nice and the shaft has some initial twist like other shafts but after the first twist it snaps back to where it started and doesn't twist anymore where steel shafts seem to keep twisting. Also it absorbs vibrations allowing your car to advance timing more because the knock sensor is seeing less vibrations. The car just feels lighter as well thats the best way to explain it.

PS I am not one for pictures sorry was to excited to put it in and forgot lol.

[Sniper512]

They are $1100 plus shipping but a group buy would see more savings for sure.

[Jung]

how long did it take you?
if you did this while you did a LWFW, clutch, and pulleys, i bet it'd feel like an f1 car engine compared to stock

[Sniper512]

It about a 2 hour job and it takes 2 people.

Ya for sure I am getting pullies soon and the clutch and LWFW is coming soon hopefully as well I'll let you know lol.

Also it has been said that the Carbon shaft helps reduce the effects of a LWFW as well.

[BITRBO]

...Also it absorbs vibrations allowing your car to advance timing more because the knock sensor is seeing less vibrations. The car just feels lighter as well thats the best way to explain it.

What?! Who told you that, the salesman?

The knock sensors operate at a very specific frequency (typically ~2-5KHz on many engines), which are interpreted as voltage rises and/or drops. These readings are then filtered by the ECU to ignore other engine "noises", so that the proper amount of timing can be adjusted during instances of predetination.

I don't doubt the car's acceleration is improved for the other reasons metioned though

[lil' is 300]

Interesting. I wish you weighed it though so we had an accurate figure to compare the stock shaft too...

[s vier]

Which one do we get for our cars?

[1NaudiA4]

Call me crazy but why would you be able to rev easier due to a carbon fiber drive shaft?

[McKennaS4]

They are $1100 plus shipping but a group buy would see more savings for sure.

work for the company? or getting a kickback for more interest? just curious. sounds like a good part regardless. anyone else with any experience with this?

[Sniper512]

No i don't work for the company lol. I did lots of research before purchasing it. I just think it is a worthy mod that is worth the money in my mind if you don't want it by all means don't get it lol.

As for the reving faster it acts somewhat like a LWFW in that respect. If you look up ACPT on the STI fourms you will see threads 40 -100 pages long about there benefits of the carbon shaft.

[McKennaS4]

thats where i heard of it before. guy with an sti had it on his 11sec car.

[The_Jerbel]

Less rotational mass. Same principle as lightweight pulleys, FW, clutch fan delete, AC delete, etc.

[Blake260]

where is this available?

[Sniper512]

ACPT they make them from scratch when you order. Thats why I mentioned a GB because they have to build them anyways. The more orders in the better the price I am sure. http://www.acpt.com/ give them a call ask for Jim Martin. If you want I can call him to find out pricing on a group buy and then go from there.

[s vier]

I would be interested. I think I need a new DS anyways...CLunkity Clunk on shifts even after RS4 tranny mounts, Motor mounts, APR Snub, and Apikol diff mount. It's about half as bad as it was when stock.

[smithm5]

some subbie friends have this and LOVE it....never heard for audi but if for some odd reason i had an extra 1000$ and nothing to do i would get this!

[JaredVL]

Did you know that older gen B5 A4s have them stock, and they are heavier than our OEM ones.

Oh and BTW, all that extra fluff about what it does, is well... fluff.

Great mod on cars with a crappy/heavy OEM shaft. We actually get a very light and strong one for free with the car.

[BastardS4]

Did you know that older gen B5 A4s have them stock, and they are heavier than our OEM ones.

They are yellow, and have a big hazardous material and "DO NOT DROP" warning on em too.

And yeah, heavy as fuck.

[Sniper512]

My stock shaft wasn't that light compared to the carbon one. And the car feels way better than before.

[1NaudiA4]

Um yeah I'm calling BS on the revs easier thing... simply because when you rev your engine in neutral/ clutch disengaged, your not spinning the drive shaft. Get off the gonga green man!

[Sniper512]

What does being neutral have to do with a car reving faster?????? Your driveshaft spins anytime your car is moving from its own power.

[JaredVL]

Weigh your stock one, then weigh the new one. If the new one is lighter ask yourself if it will take a clutch dump at 6k with sticky tires...

[exorcet]

Um yeah I'm calling BS on the revs easier thing... simply because when you rev your engine in neutral/ clutch disengaged, your not spinning the drive shaft. Get off the gonga green man!

sounds like you're the one that needs to pack another LOAD.

[Dan@JHM]

should be an interesting mod to try out. the only downside to a carbon driveshaft is if it touches anything when your moving its done, other then that im very curious to see how well it performs.

[generationjdm]

I'm shocked theres not 50 people asking for fat times and logs and all that other bullshit.haha

[AudiSportB5S4]

lol i think FATS are into the 1's with this.

[BITRBO]

I'm shocked theres not 50 people asking for fat times and logs and all that other bullshit.haha

hahaha. well played sir

And as for the question about reving: I'm pretty sure the OP meant that the engine rev'd easier/quicker while driving, which would make sense if the drive shaft is in fact lighter and/or smaller in diameter.

[Sniper512]

I can't explain the feel other than it just feels better,smoother, and goes faster lol. The shaft took a 5000rpm launch yesterday with Nitto Invos wrapping my stock rims. I would say they are sticky tires. The rear tires barked and the shaft is still in one piece.

[Boris]

Well hey, its much appreciated you shared this here with us.. This sounds interesting.

I am amazed at how much better a lighter stg 3 s4 feels than a heavy one, so Ill look into this, whether its much lighter or not

[Sniper512]

No problem. I thought that more peolple would have done this already but when I started searching not much came up. I recommend it to anyone who has done all the big mods or just need a new one anyways.

[Jesse S.]

Didn't someone on AW snap/twist a Driveshaft at the track.

And ended up replacing it with something stronger. I forget.. this was ages ago.. when I actually lurked AW on the regular.