The car sounds like it is backfiring even with the boost blowing over the MAF. I removed the belt and it stopped. It is going back to Procharger, but has anybody heard of something like this before

 

check your ignition system did you put new plugs in it ? and what heat range?

 

Sorry about the bad first post, I didn't read it. I meant to type throttle body but I typed MAF. (I'm blaming it on my keyboard ;-))

I'm sorry I wasn't more clear, even with no boost going into the "throttle body" the supercharger was still bucking and popping. I removed the part of the set-up that provides the boost from the intercooler and the SC was still malfunctioning, but the engine was running fine. I installed the sparkplugs that Procharger suggested and because the SC was malfunctioning and the engine running fine with no misfire I determined that the SC should be sent back to Procharger for them to examine.

I will update this post after I hear back from ATI. I was just curious if anybody had a similar experience.

Thanks

 

I had a similar problem, but it turned out my crank pulley wasn't turning true causing my belt to jump around and make the blower make all kinds of racket.

Another thing to check would be the bypass valve. If it's not functioning properly, the boost could be backing up and surging the blower.

 

About the only thing that works properly on that car is the blow-off valve.
Thanks for the tip about the pulley alignment.

 

Did the supercharger spin freely turning it by hand? The D1SC blowers are kind of loud and make lot of wierd kind of scary noises you might not be used to, just my

 

Tony,
Yes, when the noises first happened I called ATI and was told that there is a spring or something that keeps it in place or something (I'm not quoting ATI.) I believe it may be an alignment issue since I got the tip about pulley alignment, but since it was off the car I decided to put my fears to rest and just ship it off.

I looked at your cardomain site and saw that you have similar parts and I liked your 11 second time. May I ask what block you have, is your car very loud, and why did you pick the ZZ9 cam? I have the stock engine from a 91 Z28 which is only a two-bolt main and a BS3 ignition, 1 5/8" headers, and the HSR intake.

 

I'am still using the stock short block and with the AFR heads I have about a 8.3 compression ratio on it now. Main reason for using the ZZ9 cam was cause I wanted something small that would fit well with the TPI intake. I seen a few simular combo's on here with it also, they were running 11.3-11.4 abouts which was where I wanted to run. Plan has changed though I'am going to go with a short runner style of intake and see how that changes things, should match better with the rest of my combo.

Yes my car is pretty loud

 

Thanks Tony,

I guess I can put off investing in a 4-bolt main for now. Do you have an opinion of an equally performing quiet exhaust. I'm old and live in the suburbs.

Steve

BTW - how would I go about getting a ZZ9 Cam? I will look at the second lien holder on my house, summitracing.com

 

I'am using the magnaflow race muffler with my mufflex catback, not sure what other options there are that flow that well though and be quiet.

Pretty sure you can get a cam that will match your intake better, guess it all depends how hardcore you want to go.

 

Results from ATI Procharger:

Because it is has helicut gears the springs sometimes don't apply enough pressure. They shimmed it and I asked to have them put a 3.85" pulley on it down from a 4.50".

Thanks for all your help.

 

Check this out:

https://www.thirdgen.org/forums/powe...g-shaking.html

 

Thanks, mine was definately the head unit. I had the car running sucking air straight through the throttle body and the head unit was still making strange loud noises. I will see if it still does it if I ever get my car running again.

 

Mine too.

I eventually changed my pulley back to a larger one and it went away.

Now I am going to a 3.55" and hopefully it does not happen again.

Seems to me that it is an issue with pulling in too much air even with the bypass?