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Old 09-14-2005, 11:08 AM   #1
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Default How to find parts to fix '93 SC

So I have a noizy bearing in my SC, and it'* causing some performance issues. Sometimes it'll engage properly, othertimes it slips and feels like it'* choking.

I need to know where to find the necessary parts to rebuild it...or the name of a reputable place to send it for repair.
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Old 09-14-2005, 11:12 AM   #2
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First of all, the bearings rarely go bad. It'* usually nothing more than a $30 coupler. That fix can happen for under $100 total in 4 hours.

Secondly, bad coupler or bad bearings will have no effect on performance whatsoever. Only noise.

Let'* properly diagnose yours first, then we'll let you spend some money.

Take of the SC belt and grab the SC pulley. Wiggle it clockwise/counterclockwise fairly quickly. Hear or feel any slop? If so, that'* the coupler.

Now wiggle it up and down, side to side with no rotation. That would be a bearing check.
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Old 09-14-2005, 11:12 AM   #3
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www.zzperformance.com
www.rollingperformance.com
Texas Thunderbirds (? URL, do a search)


What do you mean it slips? Not likely for any part in there to slip. There might be some slop in the pulley if the coupler is worn or cracked.
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Old 09-14-2005, 11:31 AM   #4
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It'* hard to describe it....the SC will engage properly maybe 50% of the time. When it doesn't, I can feel/hear it trying to give boost but it bucks like a horse or rattles under hard acceleration...feels like on a pedal bike when you have a bad sprocket and you try to accelerate fast.

I've had 3 mechanics listen to it, including GM...and they're the ones who told me the bearing was at fault.
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Old 09-14-2005, 11:35 AM   #5
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The SC is ALWAYS engaged, and never disengages. You may have a problem with boost bypass, either the BCS or BCA.

What does your boost gauge read at WOT? What about mild accelleration and idle?

For the record, a dealer won't even replace the bearings or a simple coupler. They're forbidden by contract. They can only replace the entire SC or the Nosedrive. You can't get a good diagnosis by a dealer with this in mind.
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Old 09-14-2005, 12:26 PM   #6
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I realize that it'* belt driven and always engaged...but there'* no boost when it'* malfuntioning.

The gauge reads 7 psi at WOT, even if it'* not working properly.
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Old 09-14-2005, 01:16 PM   #7
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You are running in the acceptable stock range (2.5" stock pulley) for a 93. With that in mind, you are running correctly at full boost.

What are you running at idle, and how much does the needle flutter at full boost (WOT)?
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Old 09-14-2005, 02:56 PM   #8
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At idle, it sometimes fluctuates between -70 (-7psi) and maybe -6. It'* not a very precise gauge.
At WOT, the gauge will rarely go into the redline, so-to-speak...but every so often it will. It doesn't fluctuate as long as I don't change gears.
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Old 09-14-2005, 03:00 PM   #9
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Sounds like everything is normal to me. Now you need to check the mechanicals. Coupler and Bearing checks I posted above ^^^^^^^^^^
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Old 09-14-2005, 04:39 PM   #10
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Quote:
Originally Posted by willwren
Take of the SC belt and grab the SC pulley. Wiggle it clockwise/counterclockwise fairly quickly. Hear or feel any slop? If so, that'* the coupler.
Will how tight should your coupler be?? should there be any slop at all?? I got
like an 1/8th inch of slop in mine when i rock it CW/CCW??? it seems to be quiet.
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