Thread: Lucas or STP in supercharger to stop knocking

Pretty sure weve pin pointed the "knocking" or rattling down to the SC.... is there any lucas or STP type fluid tht I could put in there to make it stop before it never ever sells?

Probably just the coupler. Do it right and replace it, don't bandaid it for the next guy. Sheesh.

If its only the coupler I will change it. But I wont spend 1200 on a new supercharger... thats dumb

its the coupler, supercharger dont just "go bad"

INTENSE-Racing.com: INTENSE Supercharger Coupler Change Kit

^ Do it right. Besides, I don't think Lucas or STP would stop the bad coupler from making noise, it would probably just cause even more problems.

What GenIII M90 costs $1,200?

LOL

Originally Posted by bluegtp91

What GenIII M90 costs $1,200?

LOL

Dealer.

LOL = joke.

I know.

Thanks, ostrich jr.

Internet is a cereal place man.

Mr. fat camper.

Fat joke hurts my feelings.

You win

Originally Posted by bluegtp91

What GenIII M90 costs $1,200?

LOL

Bahahaha missed that. Truth.

3800 Performance M90 Supercharger Kit: 3800 Performance
Ported shipped would be about $750 +tax ^^^

ZZPerformance - Rebuilt Stock M90 Blower #ZZ-RM90BW
Ported not including shipping $650...

Neither would even come close to 1200 unless you paid a shop to replace them and bend you over on labor.

and another source RollingPerformance.com (he even has the how to replace instructions on his site)

Originally Posted by Fivefingerdeathpunch

Dealer.

Bahahaha I wish. Cost for me to order on is $1177.33 ... Retail is $1681.91 it does however come with pulley attached and includes new gaskets and a new vacuum hose kit. So it would be good to be installed minus the fuel injector o-rings you would want to replace while they were off.

But even if a dealer discounted it to wholesale or a close area, it would be $1500 +/- w/o taxes. So no... WAY over 1200 or WAY under lol.

PS: BTW I work parts at a GM dealership, Part# 89060470 if you want to call and compare to another lol

Just spent $50, replaced the coupling and 8oz of SC oil... sprayed the cone and impeller out real good with break cleaner... Still knocking... Any suggestions?

get a video of this knocking.

1999 grand prix gtp motor noise grandprixforums - YouTube

sounds like a bad pulley, idler,ect. take the belts off and see if it still makes the noise, take the s/c belt off run it see if its still there, if still there, then take off the accessory belt and see if its gone, if its gone, start checking the pulleys for excessive play or not spinning smoothly.

Ive done this already. Noise is still there when both belts are off... Only reason I tried the SC coupler was because there was a lot of play in SC pulley... Now the play is gone but the knocking is still there...

does it do it when the a/c is on?

EDIT: this is what happens when you post while on the phone, disregard that lol

Ermmm... still noise when both belts are off???

Bad news bud. If both belts are off, no pulleys are spinning, so not a pulley. That means nothing in the supercharger is spinning either, not the supercharger. Grats you have a new coupler, but you have engine problems too. Likely lower problems too, didn't sound like valvetrain noise to me... could be wrong.

Does it get faster with gas, or does it go away when you accelerate?

Does the car have a stock pulley or was did you/previous owner put a smaller one without supporting mods. (this usually results in chipped pistons)