Advanced Fueling Issue - Exhaust reversion?? - Need advice

[brad black]

1) From full throttle to zero throttle

do you mean that when you shut the throttle it backfires on the overrun as the revs run down?

put +20 to 30% in the 0 throttle column.  or -100, if it lets you.  see what happens.

[EEL]

do you mean that when you shut the throttle it backfires on the overrun as the revs run down?

put +20 to 30% in the 0 throttle column.  or -100, if it lets you.  see what happens.

I will try this to see what happens. I dont know if -100 will be allowed.

[EEL]

As requested here are the autotune maps from the last iteration

Horizontal Cylinder



Vertical Cylinder

[EEL]

LENGTHY UPDATE:

ITEM 1-------------------------------------------------------------------------

Exhaust leak at the horizontal cylinder head was a significant culprit to the backfiring issue. Unusually, it wasnt easily identified. I quadrupled checked that the exhaust was seated properly and and quadrupled checked that there was no leak.

HERES A LESSON FOR ALL OF YOU (or maybe i'm the only one that didn't now know this)

You need to treat the exhaust flange nuts that hold the exhaust to the head as pretty much one time use.

What would end up happening is everything would be nice and tight when I would check in the garage and the bike idling. When I would go for a ride, the nuts would physically back out about 1 full turn over the course of about 50 miles due to the exhaust pulses from riding!

Apparently these things are called "tension lock nuts". I went to the local ducati dealer and picked up 2 for dollar. I immediately noticed that they were a lot hard to install back on. Significantly less popping but some still exists. I dont think I'm going to ever get rid of it all but now its only in extreme cases and pretty much only on decel.

ITEM 2--------------------------------------------------------------------------------

UNGEHEUER's KISS AFR TABLE:

Its a good AFR table but I found that the leaner afr during cruise resulted in a less smooth ride for my 1100 EVO. I think you could go two ways:

1) Keep the KISS AFR and Install a 14T sprocket as MANY people do. This essentially bumps the RPM levels up and changes your cruise range. Essentially getting the bike to smooth out. This generally results in worse fuel economy.

2) Don't use the leaner ARF range at all. I tried a very simple map. Took all the lean values and changed them to 13.2 to match the rest of the values around it. I noticed immediately that the bike was able to run a lot smoother thru the entire rpm range. Even lugging it (3500 rpm) seemed to work fine in 6th gear. Again slightly less gas mileage (just like the 14T sprocket) but I dont have a 14T sprocket and I feel the power delivery is more linear.

ITEM 3---------------------------------------------------------------------------------

POWER COMMANDER VALUES AT 0% and 2% Throttle

With the exhaust leak issues resolved. I decided to start characterizing how my bike ran at idle and at 0% and 2% throttle. Rather than putting in random values into the PC-V I set the AFR target in the autotune to 14.0 at 0% and 2% columns just for $hits and giggles.

Turns out, the bike pretty much runs 14.0 for both these setpoints for the rexxer performance exhaust and intake flash I have from motowheels.

Only at idle was the bike running super lean. I was able to diagnose an afr of 15.5 using the live readings with the laptop plugged in. The rest of the setpoints showed no real changes (minor 1% - 3% changes in the columns.

After accepting the fueling changes to achieve 14.0 AFR from the autotune, the first thing I noticed was a much smoother idle.

Still need to experiment with a richer mixture (maybe 13.7 instead of 14.0) and see how the bike reacts. Right now I'm still getting the current map fully vetted.

If anyone is interested, PM me and I will send you the .PVM map. I dont mind sharing.

My bike is aggressively modded; no flapper (with butterfly completely removed), MWR power up kit, K&N filter, GP-M2 exhaust, Rexxer performance flash. So they may be very few that would make use of it.

[3G]

I had similar problems with pcv auto tune on my m1100. The OEM fuel cap breather was too restrictive causing fuel starvation, I  disassembled the cap and removed the restrictor washer. The  bike runs smoothly now and autotune has leaned itself out due to improved fuel supply. I have also added 13% fuel in the 0% throttle line this improved on/off throttle transition.