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Problems - knock/lean area/ peak on rpm

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hello Simon and everyone,

1.I want to ask about a drift car, what is more important to have flat torque curve or horsepower flat curve?

2.I have a false peak on rpm. I have see on log only one time a pick of 22000 rpm (image capture1), when the rev limit is 7000. Link ecu ask me a log but I did not have the opportunity to take one. There is any possible problem to have on my mind?

3.I have a log with knock sensor. I know that I have not do the perfect setting,but how I can know if some peak is knock or is fault signal from sensor. I have use shield cable for both knock sensor. they are wideband but for better filtering I use 13kHz narroband.(image capture)

4.In the same, image there is some area on boost that I see for little time a lean area from mixture. You could see two times those lean areas but are on different map area.

Thanks you for your time.

Attached Files

What kind of vehicle is this? Please give the details of vehicle and ECU, engine modifications, and what you are trying to do with the vehicle.

Also, a flat torque curve is an increasing horsepower curve, and a flat horsepower curve is a decreasing torque curve, because math.

I use a link g4+ storm ecu. It is a bmw m42b18 turbo engine. It's a drift car, and the owner ask me to be linear, he don't care only for max power. Now work with 0.65 bar boost pressure. And we want to go dyno to setting it and on 1 bar. But I want to have solved any problem before We go there.

I use a link g4+ storm ecu. It is a bmw m42b18 turbo engine. It's a drift car, and the owner ask me to be linear, he don't care only for max power. Now work with 0.65 bar boost pressure. And we want to go dyno to setting it and on 1 bar. But I want to have solved any problem before We go there.

any advice?

The most important thing you need to fix is the trigger error. With trigger error you will have sparks occurring at random times and knock control is worthless. You will likely damage the engine if you continue to drive it like this.

It sounds like valvetrain/drive slack (on the rev limiter?) is causing double edge triggering or similar. You may find you need to offset the triggers physically or change triggering setup/whether you use rising or falling edge. Is primary timing from crank or cam? Is you cam drive tensioned correctly?