E38 Flex Fuel: On the fly timing and fueling

Quote:

Originally Posted by gmh308

Wow 46,000+ views - the second most popular non-sticky thread on the forum. :O . I see some folks even built businesses out of the EFILive Flex Fuel information on here.

Anyway, back to the question from LSJuan. From memory I got a "U" build kit - frequency generator - from an electronics shop (Altronics in Australia), and built it. USD$50. A microprocessor controller like a Teensy can also do it, "just" takes some C programming. And circuit design to drive the FF pin.

Trust that makes sense.

Interesting doesn’t sound to complicated! Is there a write up on how to build this generator? I don’t have any experience on circuit boards and what not.

Did you use a knob to adjust frequency on the fly? Like a dsp5 Switch?

Quote:

Originally Posted by Lsjuan

Interesting doesn’t sound to complicated! Is there a write up on how to build this generator? I don’t have any experience on circuit boards and what not.

Did you use a knob to adjust frequency on the fly? Like a dsp5 Switch?

Something like this probably easiest:

https://www.altronics.com.au/p/q1542...nal-generator/

Anything that will at the very least generate a 50-150Hz square wave.

Made sticky.

E38 Flex Fuel: On the fly timing and fueling - anyone interested?