Racepak Sportsman Help
 

The RPM plot line is full of static and looks like a jagged piece of broken glass instead of a smooth line. And the RPM readings are crazy as well. The car Runs just fine. Driveshaft and accelerometer data plots are just fine. This is an intermittent problem with the RPM.

Re: Racepak Sportsman Help
 

RPM is read off the tach wire to the ignition box. Check the connection, shouldn't be a butt connector but soldered and terminal into ignition box. Do you have a tach connected also or reading rpm through intelligauge or RP dash? Could be a conflict with tach also, but much less likely. I would check wire for damage and faulty connection

Re: Racepak Sportsman Help
 

Had a similar problem with mine & I called Holley. The 1st thing they said was RF interference. Put new plug wires on and got a filter (MSD8830) that goes on the coil power wire, fixed.

Re: Racepak Sportsman Help
 

I had the same problem with my Computech DataMaxx data logger and that's what fixed my problem.

Sean

Re: Racepak Sportsman Help
 

Sounds like a noise issue. Check how and where the wiring is routed. Stay away from any wires that run fuel pump, water pump, fan, etc. also recheck all your grounds.