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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.

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Old 08-12-2013, 06:52 PM   #1
slates74
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Axle-Exchange One-piece Aluminum Driveshaft ~ impressions

Thank you to Mark and Mike of the Axle Exchange for including me in the development of the new one-piece aluminum driveshafts for BRZ and FRS's, it was a pleasure being a part of the process and bringing these to the market.
The install went extremely smooth and the difference is absolutely noticeable. The car accelerates much more smoothly while revving more quickly and the chassis in general feels more taught during on/off throttle transitions. The OEM Driveshaft weighs in at about 25lbs and the one piece aluminum came in at just about 12lbs.
Intro pricing will be $425 and these driveshafts can be purchased at the Axle Exchange in Fairfield, NJ or by contacting Mark at the shop at 973-808-2800. Pics will be up shortly at axle-exchange.com



Excellent customer service and an awesome product!

Manufacturing:


Next to my OEM driveshaft:


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And a shot of my BRZ in case you see me at a meet and have any questions!
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Old 08-12-2013, 07:33 PM   #2
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Does this fit fine without any hammering out of the tunnel? On past Subaru models the aluminum driveshafts (which typically are thicker than CF) will need some hammering in certain key areas so they don't rub.
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Old 08-12-2013, 08:04 PM   #3
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Yup this was literally a 30 minute install, we jack the car up from the rear so that the front end was pointing down, unbolted the old driveshaft/carrier bearing, installed the new driveshaft and we were good to go. No hammering/modifying needed. I took the car out for about an hour after that without any issues at all. Very happy with the results.
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Old 08-12-2013, 08:04 PM   #4
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oh nj? yes im feeling this upgrade,reasonable price. you go to edgewater thrusdays? id like to talk to u about it
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Old 08-12-2013, 08:37 PM   #5
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What are the U-joints and shaft rated for power wise?
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Old 08-12-2013, 08:40 PM   #6
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Intriguing.

Any NVH issues with the aluminum?

Did you take note of the yoke construction? If so were they machined, cast, or forged?
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Old 08-12-2013, 08:42 PM   #7
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Great weight savings!
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Old 08-12-2013, 09:59 PM   #8
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@slates74 Is there any vibration on high speeds?
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Old 08-12-2013, 10:21 PM   #9
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hows the noise level?
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Old 08-12-2013, 10:24 PM   #10
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NICE. interested in more info
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Old 08-12-2013, 11:30 PM   #11
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Just got back in from another drive, very happy with the results of this mod.

No notable increase in NVH and no vibration issues at any speed. Feels as smooth as stock, if not smoother. Shifts feel more positive when engaging into each gear. The only notable change in sound is that the typical noise you hear from the trans at low speed even with the stock shaft, is slightly more audible, likely because of the hollow construction of the driveshaft and the one piece design that removes all of the connecting points of the stock two piece driveshaft. I only noticed it the first time I drove the car and really can't tell the difference now.

I can honestly say I can feel a difference in the way the car accelerates, especially now that I went out for a night drive and I'm not battling heat soak in the 90 degree+ weather.
Is it like adding forced induction to the car? Of course not, but it feels similar to the difference of driving with the AC off verse on in most cars. A very worthwhile and good bang for the buck in my opinion.

I'm not sure of the yoke construction but I'll be sure to ask for you guys when I drive down to pick up my stock anchor, I mean axle . I do know that they have MANY high hp mustangs and camaro's running their driveshafts, including a 1400hp mustang that's setup as a street car and have no issues with any of the components of the driveshaft breaking.

I feel this mod, in addition to the forged BBS wheels on my car that weigh roughly 18lbs a piece, do a great job of freeing up some rotational mass and allowing the car to rev more quickly and put more power to the ground. I'd love to do a 1/4 mile run in the car on a nice cool night and see what it does with these two simple mods since my car is completely stock in terms of I/H/E and tune. I think these mods plus 4.55 or similar gears could potentially put me in the high 13 to low 14 second 1/4 mile range but that's just a guess.

For anyone interested in calling the Axle Exchange, speak with Mark and tell him Sean referred you and he'll get you in on the $425 intro price!

Grip Ronin:
I haven't made it to Edgewater in a few weeks because everytime I do I get pulled over for no front plate but I can give it a shot if the weather looks nice one night soon.
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Old 08-12-2013, 11:39 PM   #12
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UUUgggghhhhhhh, more stuff on my wish list!! You bastard!!
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Old 08-13-2013, 01:02 AM   #13
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Inquiring minds want to the know the OD of the shaft.
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Old 08-13-2013, 01:05 AM   #14
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Inquiring minds want to the know the OD of the shaft.
I think their website says 3".
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Old 08-13-2013, 02:07 AM   #15
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are there more benefits going aluminum as opposed to carbon fiber?
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Old 08-13-2013, 05:47 AM   #16
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are there more benefits going aluminum as opposed to carbon fiber?
I think just price.....I was looking at cf shafts for my wrx....they were ~25% lighter smaller od and twice the price of aluminum. ( aluminum has to be thicker to equal the strength of cf)
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Old 08-13-2013, 06:43 AM   #17
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CF will also twist more before it breaks, acting a little like a sprung hub clutch. This can be an advantage as it's more forgiving.
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Old 08-13-2013, 07:10 AM   #18
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@slates74 what was the highest speed you have gone with the new drive shaft?
The only thing that is holding me now is that I hear that Aluminum drive shaft vibrates at high speed while Carbon Fiber don't.
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Old 08-13-2013, 07:20 AM   #19
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I like the idea of a single piece aluminum driveshaft, but I keep on coming back to the same question:

On a car that is supposed to be light and inexpensive, why did the factory choose a heavier & more expensive to produce driveshaft?

There has to be a reason they went with a two-piece shaft; such as a destructive harmonic vibration that was damaging the transmission or differential...or some other reason. Twelve pounds is a lot of weight savings in the drive train, but I'm just not sure I want to jump on this band wagon until there is long-term experience with the lightweight shafts.
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Old 08-13-2013, 07:51 AM   #20
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so it sounds like theres some noticeable noise i remember my 1 piece ds on my 240sx made huge wining noises over time. good price though...
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Old 08-13-2013, 08:35 AM   #21
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Quote:
Originally Posted by slates74 View Post
I think these mods plus 4.55 or similar gears could potentially put me in the high 13 to low 14 second 1/4 mile range but that's just a guess.
The gears certainly will help. I have a 4.67 in mine and gained a noticeable improvement in power delivery. Lightweight drivetrain parts could hurt your 1/4-mile since revs drop off between shifts, unlike heavier parts that carry inertia. If 0-60 or 1/4-mile is important than you'd want a solid driveshaft more for power delivery than anything.

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On a car that is supposed to be light and inexpensive, why did the factory choose a heavier & more expensive to produce driveshaft?
It's to combat NVH. The same goes for the dual-mass flywheel. Lightweight and/or solid bits cause shakes, rattles, and noise that people would otherwise equate to an issue.

Last edited by 37; 08-14-2013 at 04:30 PM.
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Old 08-13-2013, 08:59 AM   #22
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I haven't made it to Edgewater in a few weeks because everytime I do I get pulled over for no front plate but I can give it a shot if the weather looks nice one night soon.
i wont be there this week cause im in VA but next week if the weather is good ill go. police dam near host the meet lol so zip tie a front plate lol
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