After one trashed rim i will second that.

 

Keeping it pointed straight doesn't save the sneakers though.................

 

Really? Then when did your boost drop below 6 during the dyno run?
Was the SC making 7 psi when it made 375rwhp? IIRC it was making less than 6. You must use the boost that it was making while it made max HP in your calculation. This would be for your setup of course. You may find that it makes more than 500HP on 11psi.

Andy K

 

Soon....I am working with the eaton stuff right now. In a few weeks I'll be back to the twin-screw hard core.

Andy K

 

Well, thats the chart. First redline was appx 7psi...2nd appox 5.5 psi, from what i could see on the video. Now that i have it all logged to the nats *** i will have a better grasp of it when i go to the dyno next time.

So it made it at both 7 and 5 i guess. I will have to mark the belt and pulley next time to see wether the drop is due to belt slip or in efficency at the higher RPMS. My guess is it should be slip or some other factor as with the pulley ratio the SC is barely even working....appx 12-13000 rpm. Cobras spin them over 21K!

 

Look for belt dust, or check the temperature of the supercharger pulley right after a dyno run. Don't just touch it with your hand though, because it might be very hot. Use something like one of the infrared thermometers or something and compare it to the other accessory pulleys and it might help you get a better idea of slippage.

You know, you could mount an optical sensor to measure and log supercharger pulley RPM, and then compare it to logged engine RPM and boost. You'd see exactly if and at what speed and boost level belt slippage was occuring.

 

your a sick man Z! Winter isnt THAT long down here!

 

I told you I could use more channels. Now, about logging driveshaft twist under load using an optical sensor at each end...