Figure i'll post my project since i used your supercharger. - Page 4 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-07-2007, 04:50 PM   #31
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Quote:
Originally Posted by J Wikoff
So the wastegate on the SC is always closed and you control boost with a BOV.

My earlier math was based solely on engine displacement ratio, your blower speed at 5k, and stock max Series I boost. It looked like this:

x psi = 10 * (3.8/2.5) * (4.75/7*5000/11000)

...I think, but now that I run it again, I get 4.69 psi. Guess I screwed it up earlier.
I think i have a boost leak, it'* not making over 2psi now at all. First run i got, it was exactly that number, it was between 4 and 5.

I may've blown my PCV off under the intake manifold, i'll check it sometime next week. The piping is sealed.
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Old 04-07-2007, 05:01 PM   #32
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This is it in 2psi of "action"

I think it'* slower than stock.

http://youtube.com/watch?v=6rZynShrrQk
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Old 04-07-2007, 05:06 PM   #33
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Please give us detailed pics of your mounting to the manifold.
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Old 04-07-2007, 05:43 PM   #34
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Quote:
I may've blown my PCV off under the intake manifold, i'll check it sometime next week. The piping is sealed.
I hope you're not blowing boost into the crankcase. That'* not gonna do you any good.
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Old 04-08-2007, 01:36 AM   #35
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Quote:
Originally Posted by J Wikoff
Quote:
I may've blown my PCV off under the intake manifold, i'll check it sometime next week. The piping is sealed.
I hope you're not blowing boost into the crankcase. That'* not gonna do you any good.
No, the PCV is unhooked and corked.

What do you mean my mounting to the manifold? There is no mounting to the manifold, it'* charge pipes ran to a plate i made that'* bolted to what would be the bottom of the supercharger on your cars.

Think of how centrifigul superchargers are ran i guess. It'* basically a turbo set-up that'* belt driven.
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Old 04-08-2007, 12:58 PM   #36
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Quote:
Originally Posted by willwren
Please give us detailed pics of your mounting to the manifold.
He made a hat for the supercharger and basically runs it like a centrifugal unit.
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Old 04-08-2007, 05:53 PM   #37
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Quote:
Originally Posted by O 16581 72452 5
Quote:
Originally Posted by caminated2k
What is your chain of devices?

Is it:

FILTER > MAF > TB > */C > Stock Intake

? ... or do you have the TB AFTER the */C?
Filter > AFM/MAF > */C > Charge Pipes > BOV (recirculating for proper idle) > TB
That'* the problem. Thats the exact same mistake I made. The TB MUST be before the supercharger or it won't work right.

The TB will limit the amount of air the blower can pull in. With it AFTER the */C, the */C has full access to all the air it can pull in per revolution, which is far to much for idle and low throttle. Also, your MAF is reading all that air being pulled through it that isn't making it into the engine because the throttle plate is closed.

I made the same mistake and it would run like crap because of that. Simply move the TB to PRE blower and make a flange to mount where the TB was and run the pipe to that.

SHould solve all your problems. Even though you have the BOV/Bypass, it is just way to much air moving through the blower rotors and blowing back at the maf, etc. It just makes it horribly bad and your pipes are under more pressure than you think. it isn't like a turbo, the turbo can bypass all the exhaust down the exhaust pipes and relieve all pressure.... with nothing to limit the air the blower is pulling in, even recirculating what it does pull in will cause such an air mess in there it isn't worth it.

If moving the TB is too much work, buy a spare to mount before the */C and pull the throttle plate out of the one on the intake itself to allow all air to just enter the engine. It'* a cheap way to make a flange :P

Hope this makes sense.
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Old 04-08-2007, 05:59 PM   #38
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P.*....

Your pipes system will still work fine.. just have to move the TB so the MAF can properly read the airflow the motor is ACTUALLY seeing. This is what I was in the process of doing on my setup but never finished it.

It will work! Cool project! I like it and would love more pictures!
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Old 04-09-2007, 12:36 AM   #39
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Quote:
Originally Posted by caminated2k
P.*....

Your pipes system will still work fine.. just have to move the TB so the MAF can properly read the airflow the motor is ACTUALLY seeing. This is what I was in the process of doing on my setup but never finished it.

It will work! Cool project! I like it and would love more pictures!
I would really prefer not to do that, but if i have to, i guess i will. I researched it a small amount before doing it and people basically said the downside was just that the blower is loud.

It seems to run and drive fine except when it'* cold, then it'* pig *** rich
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Old 04-09-2007, 01:58 PM   #40
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I'm not saying you HAVE to... it was simply my experience that the blower should have the TB on it'* inlet so as to limit it'* actual air intake.

If you think about it.... when your at say 3,500RPM on the freeway.. everything POST TB is under vacuum but your pipes leading up to the TB are under positive pressure. The blower has full access to air, and is spinning at ... 12,000rpm for exampe... it is pulling the same amount of air through it that it would under WOT at that given RPM. Even if it is just rerunning a given amount of air over and over.. it'* still moving a LOT of air. With the TB PRE blower... the blower itself is in vacuum and not trying to move the same amount of air and the bypass can actually do it'* job.

*shrug*.. I simply see your rich condition as the MAF reading air that isn't making it into the engine.
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