issues Dealing with Fuel film/Transient throttle/acceleration enrichment [Motec]

Hey all

I was recently attempting to dial in fuel film for my car on the road, and I managed to dampen the initial lean spike (lasts for 0.1s now). However, I'm facing some secondary rich and then lean mixture which i cannot get rid of. Weird enough, the car is not hesitating when I tip in, however, the results are still not satisfactory as it seems to experience some rather odd fuel film behaviour.

I think I got my fuel film main table setup, and I tried adjusting the fuel film fast part to be 50%, but i still seem to get the same effect.

I would appreciate it if you experienced folks, could guide me as to how to properly set up fuel film in the Motec M1 platform.

I have attached some data logs if someone would be kind enough to have a look over them

Thanks!

For me, when tuning the Fuel Film behavior of an M1, I concentrate more on the driveability of the engine than the lambda traces, I have driven some vehicles where the lambda doesn't deviate from the Fuel Aim on transients, but they stumbled when doing so as the engine actually needed more fuel (or less sometimes) during that point of operation. Yes, the ideal is for the Lambda to maintain the aim, but if it is at the expanse of driveability, I'll take the variance in the lambda first.

Thats very logical and perhaps the practical approach Rex, chasing these targets sometimes gives me tunnel vision.

you reckon i won't face any integrity issues on the engine due to these slight lean spikes as i tip in?

Thanks for your input.

For the short period of time that they exist, and usually a relatively low load on the engine, I do not see any potential for damage occurs, I haven't seen any issues on engines that I have done this way.

If this was the case, there would have been a lot of engines failing with the older ECU's that had minimal control of the acceleration enrichment strategies.