PICS!! Ported GEN III M90 until spring, then ported GEN V - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-29-2006, 12:52 AM   #1
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Default PICS!! Ported GEN III M90 until spring, then ported GEN V

So I picked this up this afternoon, after I pulled the 38K mile supercharger from my 00 coupe parts car.
Here'* the 54k mile supercharger off the 2000 GTP 4dr that I traded my 38k SC for.
The SC inlet is dirty, but when I compared it to the 38K SC inlet it definitely is smoother, but not polished smooth.....still a little ruff, but better than before.
I'm going to used this SC at the track on October 21 and through the winter, then in the spring I'll do my GEN V swap when the roads are no longer icey.
When I do swap I am going to go to the Dyno shop in Maple Grove for 3-4 runs, 2 with the ported GEN III and swap the GEN V on quick (should only take 1-2 hrs) and then do the final 2 runs with the GEN V M90 and LIM.

Pics SC case empty, but ported before it was installed on the GTP by previous owner:

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Just now after I took it off the blown motor:

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TB Oulet (MAF uninstalled):
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TB inlet:
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Old 09-29-2006, 12:59 AM   #2
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Ok, that has to be the worst machining I've ever seen on that outlet. I kid you not. And that outlet might just be big enough to reduce compressor efficiency.

And to top it off, that phenolic TB spacer is worthless. Want to reduce inlet and TB temps? spend some time porting (lightly) and polishing the inlet of the SC. It runs FAR hotter than the TB ever would because of the rough sand-casting. Thermal analysis has proven it.

At this point, I'd STRONGLY doubt the quality of that SC. That was done in a hack-shop by a 2nd grader. Seriously.
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Old 09-29-2006, 01:00 AM   #3
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Wow. That is a terrible, terrible port job. Sorry, but IMO, I think you got screwed over. :(
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Old 09-29-2006, 01:03 AM   #4
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wow...... (in reguards to will'* comment.)
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Old 09-29-2006, 01:03 AM   #5
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If you paid nothing for it, you got ripped. I wouldn't put that on any car. Someone clearly had NFC what they were doing. What else is wrong with it?
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Old 09-29-2006, 01:06 AM   #6
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Trade back your SC
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Old 09-29-2006, 01:06 AM   #7
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Thought the owner had mentioned this was a ZZP unit, but come to find out it'* one of these (Yandain on is the SN of the cars former owner, not the porter):

http://www.mnclubgp.com/forum/viewtopic.php?t=1357
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Old 09-29-2006, 01:11 AM   #8
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That guy is a pure ameteur. Polishing the INLET reduces outlet temps more than anything. SMOOTHing the outlet will have more effect on outlet temps than enlarging it.

I can't believe nobody in that topic questioned the quality of the machining.
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Old 09-29-2006, 01:15 AM   #9
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hey Will, all things besides. i does look better then that black powered one i showed ya....
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Old 09-29-2006, 01:17 AM   #10
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I'd honestly say this is worse. Perhaps the worst hack-job I've seen on a SC yet. Marty, what are your plans with this? Was it from a donor/wrecker car? Did the ND get rebuilt? At this point, I'd question EVERYTHING. You might have a good spare ND out of the deal at least, though.
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