Very rich in closed loop

[1158]

The dead times are a little low at 14 & 16V. I'd use 12V=1.50ms, 14V=1.20ms, 16V=0.92ms

Thanks. I will try those values and report back.

[1158]

Well it made some difference difference. Here is my latest cal and datalog. Note I only adjusted the fuel tables at idle for now. With the new deadtimes, taking out about 20% fuel in open loop got the car to idle around 14.7. In closed loop the AFR still goes rich (I switch to closed loop around 43 seconds in attached datalog), down to about 12.4. That is an improvement, by about 1 point. Should I keep increasing the dead times or is there another issue that could cause this? I looked at my battery voltage. It seems a little noisy but nothing excessive.

I have been searching/read forum posts on setting/adjusting deadtimes but is it best to do it in open or closed loop?

Thanks again for all the help.

[1158]

This is driving me nuts. Thought I had an idea how to proceed but it's not making any sense.

Would tuning part throttle in closed loop with max/min change % set at 0 work?

[Hondata]

There is a large drop in voltage at the 1:30 mark. I would measure the voltage at the injector clip with the engine running (one side should be battery voltage).

[1158]

There is a large drop in voltage at the 1:30 mark. I would measure the voltage at the injector clip with the engine running (one side should be battery voltage).

Ok, I will try that. Thanks.

Voltage at injectors is 13.88 down to 13.77 when fan is on (all 4 show exact same numbers and trend with fan on/off). The voltage drop you see at 130 is the fan coming on. If you plot temp with battery voltage you see temp goes to 192 when voltage drops. The fan I'm using is heavy duty it pulls 18 amps.

The closed/open loop difference happens with fan on and off and even before the car is warmed up to where the fan will come on. I also see it when I'm driving and the fan does not come on over 30 mph.

[Hondata]

It seems that you need to increase the dead times further. While driving on a flat road in about 3rd gear very slowly reduce throttle until the injectors cut. If the short term trim goes up then the dead times are too low.

[1158]

It seems that you need to increase the dead times further. While driving on a flat road in about 3rd gear very slowly reduce throttle until the injectors cut. If the short term trim goes up then the dead times are too low.

Ok, thanks I will try this.

[1158]

I'm up to 1.9-12v, 1.45-14v and 1.10-16v

And it still isn't making much difference. I've had to pull out about 35% more fuel from tables and it is still rich at idle in closed loop.

I noticed this morning that my Injector Pulse Width in closed loop is 0.15-0.20 ms higher than closed loop. Why would that be the case? What goes on in closed loop that would cause this? You can see it in the data log I posted the other day as well.

[1158]

Well for whatever reason I have not been able to resolve the difference in open loop and closed loop. I have since given up. I put the car in closed loop with S trim max/min set to 0 and dead times close to what Hondata recommended in a previous post. I made a few slight adjustments today based on how the car was running with every accessory on/full current draw.

As far as the fuel tables go I've been working on them when I have driven it the past few days and I'm making good progress. Car still has an occasional stumble, but as they happen I find out where in the fuel table it occurred and fix it. So far I have been able to "tune" each one out. In fact I'm to the point where I'm driving it in weird rpm/vac areas to see if I can get it to stumble then fix them. Overall car still runs a little rich but most areas of the part throttle fuel table are within 5% of stoich now.

Soon time for GSC cam install and traction control