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Picked up a used PST half aluminum shaft last summer. It had a small balance issue at 70mph so I decided to pull it this spring to see if the balance was off. This is what I found :( Got a great price but of course, no warranty or anything. We'll see how much PST charges for this repair. Guess I can be glad I didn't find this the hard way at the track. I probably have 15-20 4300krpm 1.8-2.0 60ft launches on it.
Anyone seen anything similar?
http://primaryboost.com/store/rt/dri...t/DSC_6210.JPG
uuugghhhh! :worked_till_5am:
If I had to guess I'd say maybe the motor mounts on that car were bad
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This is worrying. I have on of those drive shafts on the shelf waiting to be mounted on the car.
Please keep us posted regarding the response you get from PST.
Quote:
Originally Posted by Forest Gump
Bad guess then :) poly mounts, this motor doesn't move. New carrier bushings with install and the rear end bushings have also been replaced. Only thing not replaced are front/rear subframe bushings.
It's all that power you got Antonio!!
I have one of these also, so does ginger Dave, I know he has abused it more than we have. Might be just bad metal. I'd say it was cracked when you got it and it just got worse. I don't think I've heard of one of these failing before.
Could have been an older one?
I wonder if they've switched to a different joint. I'm not a fan of how there is a 90 degree corner right there and apparently it creates a point that is prone to crack.
Yeah, that stress raiser is ridiculous. It appears they have the space to radius that edge but someone just made a terrible design decision.
What are you talking about? I'm looking at the stock shaft and the PST looks a good bit beefier. What am I missing?Quote:
Originally Posted by AdamVR4
Quote:
Originally Posted by Toni
yeah you said you got the shaft used and it vibrated since you got it. The old car could've had bad mounts, damaged the ujoint, and the vibration after toy installed it cracked the yoke.
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They were talking about the u-joint issue the other day (PST vs APCT CF) in the group buy thread over there. They do have a beefier joint they use now, at least on the carbon fiber shafts.
If PST won't repair it do you think welding it is a bad idea? It won't fix the design and could potentially mess up the balance more but if you have no other options besides buying a new shaft it would be worth a shot. Otherwise, I don't know who would be able to weld a beefier u-joint on and balance it.
I had a PST cf 2 piece yoke let go on me launching at the track, the shaft dropped onto the shaft safety loof and snapped a foot off the end. They are built with 1310 yokes which are rated to 800 ftlbs instantaneous torque load but 400 continuous.
After talking to them about the options we decided to stick with the 13 series but skip the 1330 and go for a 1 piece with 1350 yokes which still fit inside a 3.25" tube and are rated to 2000 ftlbs instantaneous and 1000 ftlbs continuous.
There's a little gem for you :wink:
André
Ahh, then maybe a good guess still :lo5l: Hell, there is even a chance it was cracked when I got it and I just kept making it worse...Quote:
Originally Posted by Forest Gump
So gave them a ring they said to send it in so they can look at it. Which I guess, I am not surprised. I don't know if I have 1310 series joints. Either way I'll opt for the upgraded 1350 series joints if they are already going to be doing repair work. No further details.
They got the shaft and gave it a look over. Looks like the shaft is 5-6 years old and has an old joint. $175 plus shipping to get it changed over. There goes my savings in buying a used shaft. Still came out a little ahead but not sure if it was worth the hassle.
It's a shame they wouldn't just replace it for you without charge but I guess that isn't too bad. Seems like they should treat it as a recall though.
I think the problem is launching at 4,300,000 RPM ;) What kind of valve springs do you have?
lol 4,300,000
Misplaced that decimal point in Chrome :lo5l: