So I'm having some trouble with idle and light part throttle(<15%) cruising with these injectors.
My setup is in my sig....
I have been tuning this setup myself and have most of it done except I cant get the Afrs above 12:1 at idle and it still misfires quite a bit and it really likes to be at 11.5:1 without it wanting to die. Ive tried adjusting the 02 feedback tables, ign vs idle table,and nothing is really helping.
It seems when I try to drop them below 2ms they just start misfiring like crazy.
Full throttle and regular driving isnt bad at all.
I have a stock FPR, Fb 340 and 88/75 at 17 ps and Im only at 78% duty cycle on e85. I'm sure I could push a couple more pounds of boost and up the fuel pressure and push close to or right over 600 on e85 on this setup.
I also took it to the dyno and had the tuner look at it. He was having the exact same issues. He did say he hasnt tuned DW injectors before and recommended that I switch to something else. I know evo, srt, and supra guys have been running these with very few problems.
Ill take some videos, datalogs, and post some of my tables this weekend.

 

based on what you're describing, i'm going to say that it's the injectors. large injectors tend to have a tendency to not work well at low pulsewidths. this seems to be the case in this situation. the only way around this is to run it rich at idle so that the injectors operate within' the right range. your other option would be to run e85 lol. since e85 requires more fuel, the pulsewidths will increase. that may work.

your best bet would be to switch to a better injector.

 

I am running e85 and its still doing it. I have been thinking the same thing. I think Im going to try out a few more things this weekend and if I cant get it, Im going to switch to something else...

 

I ran into this issue with my larger injectors, and resolved it by doing 1) raising the idle RPM to 1100, enrichening the AFR at idle, and retarding ignition timing at idle. Since I use a FlashPro, I had to set my Knock Ignition Limit Low values to be -1 times whatever was in my ignition Low cells, and that gave a total ignition = 0 degrees. The ignition retard made the biggest improvement at idle.

 

I did the same thing. My tuner told me that wasnt the correct way to do it, and set it back to run really rich and at +7* at idle. Raising the rpm isnt a bad idea. Maybe I'll try that when I get home tonight.

 

LOL ... if you tuner didn't explain WHY it's the wrong way to do it, then I'd definitely ask why. When I use Live Tuning to change my ignition value while the engine is idling, the car will idle rough with STrims bouncing up and down when my idle is at 1K RPMs with +5 degrees, but if I retard timing just 3 degrees, it gets totally smooth and STrims level out. It's very surprising how much it helps. The only downside that I can think of is that it would increase EGT's a bit, but that doesn't really seem like that much of a downside ...

 

Updates:
4/21- My tuner swears its the injectors and says he has his own set of injectors that he has used in the past and they work great and he can get them to idle to 0.9 ms. Mine wont idle below 1.9ms. So I set up the dyno time and show up there. We spend a couple hours trying to get them installed. They were too short and we had to install different top hats and spacers on the fuel rail. We finally get them running. He spends another hour trying to get them to idle and cant get it past 12:1. Same exact problem.

4/23- I decide that I dont want to risk my engine to fuel wash and revert back to some of the original timing calibrations I had set up. He had the base ignition map at +16 at idle. I dropped it down to 9* and I dropped the idle vs ignition table even lower. So now it runs around 14.2-15.4 and shows an actual timing of -1*. it misfires every 30 secs to a min instead of every 10 secs or less.
What's your guys thoughts on this? Mainly, is this safe? is there anything I should be worried about doing it this way? What are your thoughts on changing the microbit/secs and/or moving the breakpoints?

I am also having a problem with tip in fuel. When I barely tap in the gas when cruising along, it swings lean and then starts adjusting itself to the fuel cell its in. Im thinking its in one of the accel tables obviously but Im not quite sure which one to start adjusting. Ill probably play with it more tonight and see if I can make some videos.


Thanks gernby and brian!

 

is it hunting for idle or is it idling smoothly? as far as throttle tip in, there's a tab labeled accel (i'm assuming you're using aem series 2). throttle tip in is all trial and error. i'd add fuel and see what happens.

 

IIRC, a totally stock '06+ idles with about 5 degrees advance. Mine idles at about -3 degrees.

 

Brian it's still seems to be hunting a little bit. I'm on series 1 using aempro. I've used aem tuner with it too and it seemed to work ok. I am just more familiar with pro and where everything is compared to tuner. I didn't get a chance to mess with it tonight, apparently my wife likes to go on these things called dates....
Gernby so I'll I'm really risking is higher egts correct?