So I'm new to this combo but have a number of Haltech, MT, and other systems under my belt. I understand how the PFC/Datalogit is supposed to work but I have one thing that's driving me up the wall. I've searched and read the manuals. So....

Like so many people (see I searched ) this thing idles rich. Around 11.3:1. The idle is smooth but it's just fat. It also cruises pretty rich. I've played with both the base and fuel correction maps and nothing changes at idle. Only to the point I set the base map at 0.0 on time then the engine shuts down. The smallest amount of fuel up to that point still produces a rich idle. Same with light throttle cruise. I can make both fatter than the low 11 rnage but not leaner. Seems that from about 10% throttle on up I have control of the fuel. I've got the high load areas dialed in where I want them. Just need to work out the light load areas.

I've played with the INJ Adjust settings and again, up to the point the injectors just shut off I get no response. The PIM offset is correct. Not sure what the scale does though or if that would have anything to do with the problem. With the 850/850 setup the scale is set to 5263. I've also changed the injector settings to 850/850, 64.7%, and .04 lag on the secondarys.

I put a new stock O2 sensor in the car. I've tried O2 correction on and off and it makes no difference in idle (not supposed to I gather) or cruise.

Lil help?

 

You need to set your inj lag negative. Just remember it will change the afr of the whole map, so you will need to retune.

 

Ok. Secondary or primary? Does the secondary just need to be -.04? Thanks BTW!

 

Your problem is with idle and light cruise because the 850 primaries are too large for the PFC to handle correctly. Thus you have to use lag as the way to lean them out.

A search on 850 will give you the same and similar anwers. SEARCHING is your friend!

 

Lag did it. Thanks for the help.