Our DIC"* will tell us anything EXCEPT PCM codes.

The only display on the Bonnevilles that gives codes is the electronic climate control, and that display only gives electronic climate control codes.

i took a look at it and i bet my belt slips (tensioner worn?) anybody have a part # for a tensioner for my car? is there 2?

Which part are you thinking is worn? The idler or the tensioner spring? I can get you part numbers, but not until I get home. If you suspect belt slip, I'd suggest the ZZP oversized idler pulley. With my 2.2" pulley, it'* critical for belt wrap.

Along the same lines (but in the opposite direction), should the boost be at -10 when idling? I don't think I've ever seen mine lower than -8. Is that normal?

that'* fine.. when it goes to the + it'* boosting the engine/car.. but in idle and such you don't run boost ( in a sense ). If you got WOT and you're still in the "-" then you have issues than.. I thought the same at first.. thinkin it should always read 0.. but it supposedly when it reads "0" the pressure going into the engine is the same is outdoor air ( vs. N/A cars which has to SUCK the air in ) ..

I"m sure someone can define it a lot better then I can.. but bottom line is its all good an no worries

You're on it, Murdock.

When you're at idle, you have no boost. You're reading manifold vacuum, Hailey. Just as if you weren't SC. If you're not all the way down on -10, it just means there are other factors playing in. Idle speed, cold engine, cold outside air, etc. Anywhere in the -8-10 range is fine. Mine is usually around -7 since the smaller pulley was installed.

Under moderate accelleration, you'll be at about 0, as the manifold vacuum slowly 'becomes' compressed air. On a stock SSEi, at WOT, you should be hitting 8-10psi depending on outside air temp and humidity.

Thanks for the explanations...I was just wondering.

Hey Will, what is belt wrap? I went down below the recommended 2.5 to a 2.4 pulley and am getting 12-14 PSI. I also have the 200 amp alternator which has a slightly smaller pulley. I was interested in getting a larger tensioner pulley but didnt know where to go. ZZP makes them for the series I?
Once my water pump blows up and i replace it, i will have replaced everything that is belt driven within the last 2 months. (with exception to the idler/tensioner)

Alternator- Upgrade
Harmonic Balancer- went bad
supercharger- went bad a year ago- new pulley on new SC a few months ago
and the killer that happened last week-
AC compressor. that cost 859.00!!! 600 just for the part. but DAMN ITS COLD NOW!

Ironically, these things didnt start going bad until i put the smaller SC pulley on.

Reading up on boost/vacuum I read that at 0, the engine is at 100 percent efficiency . Beyond that, its being force fed by the SC. Most n/a cars run at about 70-80 precent efficiency, so figure -2 or -3 at WOT. At least so I read.