eCtune

I was having bad problems with my maps being really rough and the lines actually crossing back and forth. I couldn't fix it for the life of me, it was just what the car was wanting and what the wideband was logging and showing. BEFORE: AFTER: All I did in this case was raise the injector offset and re adjust the maps. I had this problem a while back with rough maps with different injectors and I had to lower the injector offset and correct in the map. So basically if you get rough maps try going down or up a few points with your injector offset. Hope this helps, dk

hrm, interesting. I was having that same issue.

I've never really run across this problem.. What is your process for tuning fuel??

The DSM 450's I have on one car are like this. Zero offset will make idle super lean, everything else rich (stock rescaling and adjusting batt. offsets). I got a map that supposedly ran well with them, and one of the correction settings was at 18 vs my 0. World of a difference. The other thing I do is try to tune one-three individual columns, then semi-calibrate the whole map using that. Wacky lines like that normally start when you adjust individual cells. You almost have to get every load cell filled with an AFR to do that effectively. However when the whole column is off by X amount, its far easier to adjust the whole thing (rough), then go after individual trouble cells (fine tune) afterwards. I'd have loved to see this post 3 weeks ago Thanks anyways.

what i do... set an offset for a basemap.. start the car cold... have injector cal tool open... i always lower the ect fuel correction... then start car... and adjust offset until the car is full warmed then i want like 13.5 14 at idle and then turn off cool down and start again see if warm up afr is good and post fuel is good... never have crossing lines problems not with dsm not with 1000cc nothing...