I'm pretty pissed off with this whole ordeal. I've no idea what else to do or try. I was hacked off enough tonight to consider selling the damn car.

Many of you know I got rid of my stock driveshaft back in September because it was causing false engine knock due to bad carrier bearings. I ordered a PST 1 piece CFDS. After installing it, I had mad vibration above 80 mph that I couldn't get rid of. I returned the 1 piece CFDS and picked up a 2 piece CFDS. I've had nothing but problems with the 2 piece unit. I get a constant whirring wobble noise anytime the car is moving, foward or reverse, which seems to be coming from underneath the car. I have tried (thanks Mike for helping both times) taking the driveshaft off and putting it back on again to no avail using different combinations of spacers and insulators on the carrier mount. I've NO IDEA what to try. The car isn't even driveable right now. The whirring wobble noise just screams "somethings wrong - dont drive me anymore".

I didn't have this problem with the 1 piece CFDS, however I had vibration problems which poses a problem for me taking it on the road course. With the 2 piece unit, I can't even take it on the street.

I could send the 2 piece unit back, IF they'll even refund my $ for it. But then I'm still without a driveshaft. I could TRY to go back to a 1 piece unit, but that didn't work for me before. I can't go back to the stock driveshaft as I no longer have it, and there's no way in hell I'm buying a new DS from Mitsu for $1500.

Does anyone have any idea what can be causing this problem?

Mike - Chime in with your own thoughts on the matter since you've been helping me on the install.... We've considered putting the 2 piece unit on Mike's car and seeing if he has the same problems. It's just a PITA to keep fucking around with it time and time again, especially with the cold weather.

Royally pissed off,
Jesse

What does PST have to say about all of this? Does the 2 piece unit use its own carrier bearing at the joint?

If you wanted to go through the effort, I'd be willing to give you my 1 piece to try if you wanted (to try that is )....that would tell you if going to another 1 piece showed any promise.

Just an idea...

Good luck Jesse-

Matt

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1993 Sandstone Gray Metallic VR-4 (1 of 56)
11.77@122
11.76@119

Matt,
The PST 2 piece uses it's own carrier bearing. The stock carriers arent used. However, some of hte mounting pieces from the stock unit are used (such as the spacers, insulators, etc.).

Last time i spoke with PST about the problem I wasn't happy with the answer. They are telling me I have the carrier bearing mounting bracket in backwards. There is an etching on the bracket that has an arrow pointing forward that is supposed to point to the front of the car. However, this is WRONG. They however, say it's right. Bullshit. There is NO freakin way that thing can properly mount pointed to the front of the car. Mike and Joe both have seen it for themselves. PST is either 100% wroung about this or they have some mislabled carrier bearing mounting brackets (they supply with piece wiht the 2 piece unit).

One option I might try is to spray the hell out of the carrier bearing with WD40 and see if the pitch/tone of the whirling woble noise changes. if so, then it points to a defective bearing.

I will PM you about your offer on the 1 piece.

Jesse

I'd say, try the WD40 trick to see if its comming from the bearing or not. Just make sure you get the noise to start first and then spray it so you know exactly if it affect it or not. Like I said about the noise thing, its hard as hell to tell where a DS noise is comming from. Take my car for instance. First time my tranfer case was clanking, dealer took it apart and the inside was pretty shredded. Replaced Tcase and a month later there was clanking again. Had 3 people say it was comming from the front of the car. Took it back and that time it was the rear most 2 pieces of my DS that were screwed up and the clanking noise was being carried through the DS to the Tcase. So to make a long story short, I guess next best option would be to try the wd40 trick. Next option after that would be to put the DS on my car and see if it works. Maybe your car just doesnt like CF drive shafts.....

Oh and btw....there is no way that the mounting bracket can go in the way they marked it. I'm no 3S expert, but I've done my fair share of work on them and I could have a case of beer in me and I could still figure out that they marked the damn thing wrong. We even took the time to take one of the mounts down from my car and compared them to see how exactly the combination of spacers and rubber mounts and stuff go. Hey Jesse - are you on vacation now btw for Christmas break?

Nope. I don't have the Christmas break off so I'm still at work.

I think this is the problem. How old are the insulators? Are they the origonal ones off the car?

_________________
06 Blue EVO 9

Brand spankin' new insulators purchased from Mitsu this week.

I vote for just rigging up a wd40 sprayer on the car that sprays every 2 min, problem solved.

As much as I wanted to go with Mike's suggestion of a WD40 sprayer, hehe, I ended up pulling the entire CFDS off the car again and checking it out. The whirling wobble seemed to be occuring because the DS was position like an upside down V like /\ where the middle was higher than the ends. From the way it looked, this was causing the carrier mount to press up against the carrier bearing too much causing it to rub in places in shouldnt against the rubber. I added 2 flat washers to each side of the carrier mount where it meets the underside of the car to make the DS a bit more level. I probably coulda gone with 3 per side but I'm tired of messing with it.

Today I took the car out. No whirling wobble. Went up to 130-135mph on some backroads by my house. No vibration, no whirling wobble. Looks like I finally have a carbon fiber DS that works with my car... Just took me forever to figure out how the bastard wanted to be mounted.

Jesse

Congradulations Jesse....it sounds like you got everything worked out. I was just thinking of calling you tomorrow to see about heading down with my 1 piece! Glad to hear you made it work.

Matt

_________________
1993 Sandstone Gray Metallic VR-4 (1 of 56)
11.77@122
11.76@119