Pro Mouse

iTrader: (15)

I am cruising down the road with WB at 14-15 afr let off the throttle completely and it goes pig rich 12-13 afr until car is stopped.What do I need to look into?Keep in mind the Car is Tuned in Open Loop only.
Thanks

edcmat-l1

iTrader: (10)

Most likely the decel fuel tables. It should go into fuel cut off when you let off the throttle.

Pro Mouse

iTrader: (15)

Does DFCO work in Open loop?

jimmyblue

iTrader: (11)

If your minimum injector pulse width is greater than
what the closed-throttle airflow can burn off, you will
see rich readings. I think this is what DFCO is about,
like if you can't control it clean then cut it off altogether.
Fuel economy is a bonus, stanky pipe gets you flunked
at platform EPA certification.

2002_Z28_Six_Speed

iTrader: (19)

Hard to tune. You have min pulse adjust by RPM I believe. Which isn't too horrible. Hard to think about. Then, you have to add a value to that based on the actual PW in mS. Fun Times.

An online calculator got mine more or less. I just filled in for different "idles" and kpa ect ect. The calculator stated my idle was 2.8 ms at 34 kPa so I plugged in 20kPa and shoved that in as the min pulse for that RPM cell. Jacked up the RPM value and used that as the next min pulse cell.

2002_Z28_Six_Speed

iTrader: (19)

With this I believe you could make very educated guesses at what it would be if there was instanst opening and closing of the injectors and the fuel got there instanstly and then stopped instanstly.


http://www.rbracing-rsr.com/calcinjpulse.html

Pro Mouse

iTrader: (15)

Well I better get my MAF dialed in before I tackle this one.It shows rich but do you guys think it is still dumping fuel 100% off throttle?

2002_Z28_Six_Speed

iTrader: (19)

It will still use fuel if you take your foot off the gas. Down to 20 to 30 kPa. In this region the PW of the injectors will be so small you will see errors in the WB correction.