Power loss on low fuel?

[kanaka]

That threshold has to be.. like.. a liter or less. I've seen anyone have issue with very low fuel at the track. 2 gallons-ish is most folks are using.

I have some logs to show fuel pressure reduction at lower bars as well right before hitting the fuel reserve, and I know historically bmw will add that as a failsafe to prevent burning your pumps out from starvation

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[razorlab]

I think @zrk is talking about straight line drag racing and most of us are talking about track use with corners and lateral forces that sweep the gas from saddle to saddle.

It's 1000% a real thing on tracks with corners where you turn your steering wheels and with big right handed sweepers. It's documented, proven. People have added surge tanks to combat the issue. @JackieD86 added a surge tank because of this as well as others who compete on track.

I can't speak for straight line stuff because I bowl with bowling balls, not cars.

 

[razorlab]

I have some logs to show fuel pressure reduction at lower bars as well right before hitting the fuel reserve, and I know historically bmw will add that as a failsafe to prevent burning your pumps out from starvation

Yup, there are tables in the ECU for specifically this reason.

 

[underdonk]

I've learned something today. Thank you all for the information!

 

[AbdulN]

On another note, who is a reputable tuner that is comfortable with the BM3 platform?

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