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Old 05-02-2013, 08:40 AM   #26
blehhh
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Quote:
Originally Posted by Rodwrx23 View Post
I absolutely love my DSS cf shaft. I got tired of staring at it online and saying "next year" for several years in a row. I got a sweet deal on it too from IIR
I drooled over it for months too and finally decided to buy it one slow morning at work.

Despite all of my other drivetrain mods, and now after my stock to stage III upgrade, there's still that unavoidable bucking / shacking / bouncing / rocking / clunking that are unacceptable to me if I'm truly going to love and keep this car for years to come.

I'm prepared to accept that the off-throttle bouncing will still be present to a degree though, as I can see that being the sprung clutch. (I have even noticed that if I press the clutch in abruptly while engine-braking down-hill, I get a sound that definitely sounds like a loaded clutch, springing free and clanking back and forth.)

This is torture though to finally buy one and receive the wrong piece!
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Last edited by blehhh; 05-02-2013 at 08:45 AM.
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Old 05-03-2013, 11:00 AM   #27
blehhh
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Update: PST is fabricating a new shaft today and shipping it out ASAP.

Apparently the one I received is for a Getrag rear diff... common rear diff for the Supra, Corvette, Camaro crowd.
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Old 05-03-2013, 01:32 PM   #28
MaddMax
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A lot of your drivetrain slack could be attributed to suspension settings as well. You could be under or over dampened on the shocks.

There there is always going to be driveline slack in a manual car, especially one with a fairly involved AWD system like the WRX. Automatics don't have as much slack because the torque converter softens and reduces the slack.

Getting on and off the throttle hard in a deeper gear, especially 1st and 2nd will certainly result in some fairly aggressive chassis movement. Compound that with the fact that the reciprocating assembly and flywheel are relatively light so the chassis is more free to overwhelm the motor on off throttle, in gear events.

In a true race situation, for which of these aftermarket are designed, you're either hard on the brakes or are on the gas. There's no letting off and coasting.
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Old 05-07-2013, 04:42 PM   #29
hippystinx
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I am tuned in and interested.....i am in exactly the same boat with you on my 5 speed. I have pretty much every bushing i could think of related to drive train and i have all sorts of weirdness in it now, the reason i was explained was the bushings help to smooth out the weirdness, when you stiffen everything all the drive train shock and drivetrain whine is transmitted directly to the driver. But i also think the stock drive shaft is a beast and super unnecessary, and will soon be trying to upgrade to a carbon fiber drive shaft...so i am subscribed.


basically i was told to learn to drive my transmission better, and rev and gear match properly to help dissipate the shock.
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Old 05-07-2013, 10:46 PM   #30
blehhh
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Originally Posted by hippystinx View Post
I am tuned in and interested.....i am in exactly the same boat with you on my 5 speed. I have pretty much every bushing i could think of related to drive train and i have all sorts of weirdness in it now, the reason i was explained was the bushings help to smooth out the weirdness, when you stiffen everything all the drive train shock and drivetrain whine is transmitted directly to the driver. But i also think the stock drive shaft is a beast and super unnecessary, and will soon be trying to upgrade to a carbon fiber drive shaft...so i am subscribed.


basically i was told to learn to drive my transmission better, and rev and gear match properly to help dissipate the shock.
I find myself perfectly able to shift smoothly, and rev match properly, both up and down, but doing so makes me so tense it's simply unpleasant to drive at times. I'm concentrating so hard on getting it perfect, I'm not relaxed and enjoying the car. I just kind of wince each time I shift, hoping I don't cause it to bump, and then I'm surprised when it's smooth. I want to knock out that slack and widen that margin of error in shifting.

Hopefully received the correct driveshaft direct from PST this week and have it installed on Saturday.
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Old 05-11-2013, 02:03 PM   #31
blehhh
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Update: PST installed. Vibrates HORRIBLY. I absolutely hate it. My mirrors are useless about 50mph from the vibration and it's loud to the point of sounding like exhaust drone. So pissed off right now. We'll see what PST can do for me.
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Old 05-11-2013, 02:11 PM   #32
LIQUIDSK8S
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Quote:
Originally Posted by blehhh View Post
Update: PST installed. Vibrates HORRIBLY. I absolutely hate it. My mirrors are useless about 50mph from the vibration and it's loud to the point of sounding like exhaust drone. So pissed off right now. We'll see what PST can do for me.
Weird, I would def see what they have to say.

I have a ACPT CF shaft and its much smoother than stock. One of my favorite mods.
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Old 05-11-2013, 10:54 PM   #33
blehhh
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I just gave it a half-turn, (hoping to completely cancel out any compounding disagreement between the rear diff flange and the driveshaft flange), but it improved only slightly. Still audibly vibrates the entire car above 50mph.

Looking at it again, knowing it vibrates, I think the rear flange-yoke alignment was off when they welded it, tipping off axis, which would make the end of the shaft move around in a tiny circle as it rotates, instead of rotating perfectly in place on a perfect axis. Maybe they can just send a new rear flange-yoke.
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Old 05-11-2013, 11:17 PM   #34
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If I were you I'd be done with PST and go with a DSS one.
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Old 05-11-2013, 11:53 PM   #35
blehhh
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Originally Posted by gsrcrxsi View Post
If I were you I'd be done with PST and go with a DSS one.
I've heard just the opposite too though, that someone's DSS was junk and that they're PST was better. It's like car insurance, I swear... At this point, I'm inclined to believe your position.

I'll see what they respond with. Cygnus Performance, Rally Sport Direct Wholesale & PST are all copied in the correspondence, and things just keep getting worse, so hopefully PST will see it through to make good on this.
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Old 05-12-2013, 02:13 PM   #36
blehhh
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I'm gonna take a shot in the dark and guess that this is the problem...






Last edited by blehhh; 05-12-2013 at 02:29 PM.
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Old 05-13-2013, 11:20 PM   #37
blehhh
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Sending both driveshafts back to PST and buying a DSS.
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Old 05-14-2013, 11:10 AM   #38
gsrcrxsi
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was it rubbing on something on the trans?
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Old 05-14-2013, 11:22 AM   #39
blehhh
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was it rubbing on something on the trans?
No, the output shaft yoke on both shafts was visually warped / untrue from poor casting. They intentionally ground down one side of the yoke on both shafts in an attempt to bring them into balance. That doesn't change the fact that the center of yoke is still off-axis, and sending the end of the shaft in a tiny circle as it rotates.

Not impressed in the slightest by their QA/QC or their methods. DSS appears to be a different league. DSS order placed. PST shafts returned.
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Old 05-14-2013, 02:53 PM   #40
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It's hard to tell what's going on - could you post a larger picture?
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Old 05-14-2013, 02:58 PM   #41
blehhh
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It's hard to tell what's going on - could you post a larger picture?
If you look closely, you'll that there are problems even at a molecular level...
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Old 05-14-2013, 02:59 PM   #42
Lrn2Corner
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Keep us informed, would love to know what your results are.
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Old 05-14-2013, 03:07 PM   #43
blehhh
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Keep us informed, would love to know what your results are.
Will do. Even with the PST, I could tell a significant difference in throttle response and reduced bucking / shaking / bouncing at low speeds. The car felt like it was 200lbs lighter pulling out onto the street, (since the percieved mushiness of the throttle is so drastically reduced.)
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Old 05-14-2013, 03:46 PM   #44
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I'm interested in seeing how you like the DSS shaft. Any chance you can measure the diameter of the PST vs. the DSS before you swap?
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Old 05-14-2013, 03:47 PM   #45
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Quote:
Originally Posted by blehhh View Post

If you look closely, you'll that there are problems even at a molecular level...
Bahaha!! Sorry my electron vision is acting up today/
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Old 05-14-2013, 03:59 PM   #46
blehhh
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I'm interested in seeing how you like the DSS shaft. Any chance you can measure the diameter of the PST vs. the DSS before you swap?
Unfortunately both PST driveshafts are all packaged up and waiting to be hauled away by UPS right now.

As I always say, Ben, I can't believe you haven't thrown a CF DS in that beast yet.

I'll try to do a thorough write-up and maybe some GoPro footage when I'm all squared away.
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Old 05-21-2013, 10:03 AM   #47
blehhh
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PST received the driveshafts I sent back and confirmed that they did have notable run out at the trans end. The yoke itself was poorly cast, visually crooked, which is why they had to grind off sooo much of it to balance the yoke. That should have been a red flag that the shaft assembly would have severe run out.

They attribute the lack of QC to the rush to fabricate & resend the right shaft. If I were them, I'd take a look at how their yokes are even being cast if they'r receiving them with that much run out.
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Old 05-21-2013, 12:39 PM   #48
gsrcrxsi
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whats the ETA for the DSS?
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Old 05-21-2013, 12:42 PM   #49
blehhh
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whats the ETA for the DSS?
I placed my order 7 days ago, and they told me they had a 1-2 week lead time on fabrication, so hopefully I'll have it installed before the end of the month.

My car made 291 whp / 313 wtq on a dynojet this weekend though; severely heatsoaked, stock plugs, stock driveshaft, 91 oct. I think with the One Step Colder plugs now installed, on 93 oct, with the DSS, it would put down over 300whp.
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Old 05-21-2013, 08:09 PM   #50
ironx
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Well I was about to buy a type-N trans mount because of this same "slack" issue... which is also driving me crazy. Let us know how the good carbon fiber shaft works out
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