Well had a scare this weekend. Was on my way to autocross on Sunday, got behind a slower car on I-70, went to pass and as the passing gear kicked in the blower spun up faster than the ECM could keep up. There was a loud thud and then P0014/P0024 and the exhaust cams were out of sync with the Crank. The motor rattled and shook and sounded like a hoopty without a muffler. Power went way down and oil pressure dropped to 10PSI. I thought I blew the heads of the motor. Had it towed to the dealership, told them what I did, and what happen and left it to them.
Dealership said the crank bolt had backed out and caused the low oil pressure. The low oil pressure caused the cam position system to malfunction, etc, etc, etc. The MasterTech who works on my car there said this is also seen on the ZR1 Corvettes where the threads on the crankbolt get stretched so GM redesigned the bolt and that's what he put into my motor.
Moral of the story: I have renamed this mod from Snake Bite to Rattler (Must be a Diamondback cause this ain't been cheap). This is the third time I've had bolts walk out of their seats since I installed this supercharger. The SC and the gears rattle so much the car wants to disintegrate. I don't feel it from my seat of the pants meter, but I know its there. I will be checking the bolts everywhere on at least a monthly basis from now on.
Back to the datalogging. One parameter that I can monitor is "Intake Manifold Absolute Pressure." I thought this was a sensor prior to the supercharger. Yes?? No?? Someone fill me in cause the same log I got the IATs data from showed this sensor ranging from 3.3lbs to 23lbs with an average of 7.5lbs. Should I be concerned??
Next week I have a 2000 mile road trip planned two car shows and ending with autocross at the conclusion. Let's hope the Rattler can hold together. I'll be data logging a few legs of the trip to review when I get back home.
I'll then get to work on the exhaust.