over RPM before reaching limit

[benjamindp]

Hi,
When we're testing on the dyno. The OVERRPM comes at 6500-7000rpm while the limit is set on 8000.
This is the setup we've got.

rpm limit.jpg (150.85 KiB) Viewed 13660 times

because of this problem we can't measure our power and torque at 7000-8000rpm.
Any suggestions how we can solve this problem?

Greatings Benjamin

[David Ferguson]

Are you sure the OverRPM message isn't from your dyno? My dyno has a maximum RPM, and to keep within that I often have to use a lower gear (higher gear ratio).

[stevieturbo]

And are you sure you havent an rpm limit enabled somewhere else ? Maybe speed based, gear based etc ?

And what if you set that rev limited to say 4000, or 10,000 ? How does it behave ?

[benjamindp]

And are you sure you havent an rpm limit enabled somewhere else ? Maybe speed based, gear based etc ?

And what if you set that rev limited to say 4000, or 10,000 ? How does it behave ?

motec only knows engine speed ( rpm ). No gears or wheel speed.
Setted the limit on 9000. Now i can rev until 8000-8200.
then we've got the error again.
Maybe to much noise on sync/rev signal?

[benjamindp]

Are you sure the OverRPM message isn't from your dyno? My dyno has a maximum RPM, and to keep within that I often have to use a lower gear (higher gear ratio).

no the dyno doesn't limit the RPM.
Even in neutral i can't rev over 7000..

[stevieturbo]

Are you getting any crank/cam errors ?

Is the engine tuned correctly as far as fuel/spark goes ?