Syvecs Forums

All,

I have some Tip-In issues (Transient Fuelling).

I have noticed that I always get small lean-out spike when doing a quick blip from say 1k rpm. I have added loads of fuel in the fuel map and it doesn't seem to make things better. I have played with the Transient Fuelling a lot and it also did not really make things better. I get a rich dip right after the blip and that does get worse or better playing with either Fuel map or Transient Fuelling.

So is it normal to get a small lean spike when blipping at low rpm? Please advise what things to check and perhaps somebody has a good working setting on a Subaru DBW MY06 with ID1000 injectors?? Thanks for any feedback.

Best Regards,

Jasper.

I don't think you're lambda will react fast enough, and with large transients from low RPM you will probably get a lean spike due to a momentary loss in atomization. Suddenly you're putting a lot of extra fuel in but the airspeed is quite low, compared to say 4000rpm and 0.1bar of boost.

You should try and go by sound and feel, and if you blip the throttle a few times in quick succession it shouldn't start to choke the engine, if it does there is too much fuel going in.

When it feels right there is usually a very short lean spike followed by a slight rich period. But each car is different.