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Originally Posted by tyndago
I have never heard of this in the factory ECU. I will enquire into it myself. I know that at higher RPM's we see some RPM drift. The thing is that the RPM is picked up off the CAS.
The CAS is belt driven, and I think the belt moves around a little. One a 600 hp car under load, I would see the RPMS move around 200-600 rpms up and down. Thats on a new build, with a new motor. If you are on the Datalogit group - for Power FC. In the files section, there are some logs of Nicks car 11 second runs. You can see in secessive frames the RPM's bouncing.
I remember reading that Mario - Exvitermini had issues with the Motec and the Nissan CAS. I think they were seeing something similar. Big rpm movements frame to frame.
I have a Nissan CAS that was altered to run a pre- Nissan CAS AEM. They made a new wheel for it. Seemed to work out ok on that car. It did over 900 whp.
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This is what im talking about....