More ve anayze live tuning or changing the values in the cell manually?
Is it also not enough resolution on the table? Since the prob is due to spiking lean at light throttle, should the afr target be richened up in that area where it is occuring?
Load dyno would be ideal but not possible at the moment.
Last edited by bogly; 10-24-2010 at 11:20 AM.
Reason: spelling and grammar errors (typing on phone)
This reminded me of when I was running band aids, before the 02 clamp went it. The ecu was trying to pull fuel to bring AF Ratio back to stoich and at the same time, boost is starting to ramp up and fuel is needed.
This time, the oscillations are much faster though.
The way I understand it is it will try to hit the A/F Ratios in the AFR Table, and make adjustments in the VE table as a result.
But, as richyvr said above, this may very well be a tuning issue. I'd love to follow this, but need a point on which direction to go.
Not asking for hand-holding, just pointer in the right direction.
BTW, added also is the EGO screenshot.
Last edited by bogly; 10-24-2010 at 11:21 AM.
It's still there, but not as harsh. Perhaps more VE Analyze Live will smoothen it out some more. I've also increased the numbers in the 3400RPM & 84kpa intersection by 4 points in the ve table. Then more VE live tuning and look at the numbers.
With the EGO controller authority set to 5 before, does this mean it was 'fighting' with VE analyze live?
it's not even the FMU, it's just symptomatic of requiring tuning!
He will get a much better tune without the fmu raising fuel pressure at boost onset (0psi) which is exactly where the trouble starts. How do I know? I have the exact same setup with blue top injectors and no fmu.
Paulj- kpa over run settings is 20. It was closer to 30 before and changed to 20 when the lean spike problem was noticed.
Well, I loosened the small needle valve on the FMU and the response was better with less spiking. Unfortunately, I won't be able to test until tomorrow morning. But on the short drive with a brief stint in the problem area, the AFR was solid and consistent.