19NOV14.1.hpt19nov14.2.hpl19nov14.3.hpl
I recently installed a set of 1000cc Deatschwerks 1000cc 95lb injectors to replace the 60 lb injectors after they ended up maxing out at 116% duty cycle on my new build. The engine is a 415 ci, with about 9:1 compression, 2 bar speed density - otherwise it ran just fine with the 60s.
So with the new injectors, I received the injector data straight from Deatschwerks, Im assuming it's good. It will run fine and the fuel trims are able to learn enough to keep it around 14.7 afr. The problem is, when I just barely touch the throttle, it will make a sudden change in afr to around 10:1 and just spit raw fuel out the exhaust, let off the gas and it goes completely to the other extreme and leans out completely. Under part throttle cruising the afr looks good and its able to learn the LTFTs and maintain 14.7 average. I haven't gotten around to tuning the boosted region of the VE table yet, but it seems to be working fine in that area too.
So basically, I can tell it's making a transition when I just barely step on the gas and then makes another transition when I let off the gas, but in between during part throttle operation it's fine. At first I thought the throttle cracker and or follower might be playing a role but that would just make it hang a little but I haven't experimented with that yet so maybe Im wrong.
I posted 2 scans, one of them I forgot to connect the WB. The scan shows where it's trying to subtract 15% at 1600 rpm and 20kpa but only 3% at 25 kpa even though the two cells are set to 39 and 43 respectively. This issue is more evident at the lower rpms but happens at whatever rpm Im at when I transition on or off the gas. It's just able to recover under more load for some reason.
Does anybody have any ideas of something Im missing? I just need a little nudge in the right direction I think.
Thanks in advance.