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RPM limit for ME7.5?? 8100?
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Topic: RPM limit for ME7.5?? 8100? (Read 1598 times)
BlackT
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RPM limit for ME7.5?? 8100?
« on: September 05, 2025, 02:00:22 PM »
I am getting some probles at high rpm, after 8000 RPM my ignition start to follow KFZWMN and target lambda is 1.06 like the ecu goes in overrun mode?
Rpm limits are set to 8600 rpm
ECU is 8E0 518 AL 005 version
Any hardcore limits in ecu, or it is hardware limit for this ECU than can not compute past that rpm
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celtempperformance
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Re: RPM limit for ME7.5?? 8100?
« Reply #1 on: September 08, 2025, 11:41:34 AM »
Do you have a read out of the file?
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Nik62
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Re: RPM limit for ME7.5?? 8100?
« Reply #2 on: November 04, 2025, 08:45:45 AM »
Perhaps B_sa has some influence on this.
I rev the engine to 8500, but the angle doesn't decrease.
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Last Edit: November 04, 2025, 08:48:43 AM by Nik62
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BlackT
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Re: RPM limit for ME7.5?? 8100?
« Reply #3 on: November 04, 2025, 03:15:07 PM »
No intervention from B_sa
I manage to rev it to around 8600, it was problem with checking actual boost vs desired boost.
But I still have problems after 8500 rpm, again start to retard ignition and maybe cut fuel( I dont see in logs, but can feel it)
I need to rev engine at least 9000 rpm
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Nik62
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Re: RPM limit for ME7.5?? 8100?
« Reply #4 on: November 04, 2025, 11:55:40 PM »
I had a problem where when the boost reached 3 bar, the ignition would cut out. I couldn't solve it.
In the end, I simply changed the MAP calibration. Even with an actual pressure of 3 bar, the ECU reads 2.5.
I didn't find any effect of boost on ignition timing.
When the actual boost pressure exceeds the set value, the throttle valve closes.
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