Sorry guys i been swamped at work and havnt gotten to get a datalog uploaded. I have low injectors (83lb) went i posted this my dead time was set at 0.63. Since Wes reply i have lowered it to 0.55 it has defiantly smoothed out and is not as bad. How low can i go with thia valve?
You'll need to do some tube adjustments when you change the dead time value to get the AFR where it needs to be. You can certainly go farther if you find it needs more but where it's at now is as low as I'd expect it to need to be.
I have been having this issue with my car running rich the first 10% of tps. I have messed with the dead time, it did seem smother but still rich, (went from .45-.9) nothing cleared it up. thru town where I'm going pretty slow on and off the clutch/throttle it sounds like a v8 cammed out popping and misfiring around. it idles great 13.5-14.7 afr and runs great anything past 10% throttle.
current set up:
2.3 turbo ms2 sequential 83lb holley low z injectors
Also while im thinking of it, a friend of mine pointed out that my ve table vaules are pretty low (20's at idle) is the normal for bigger injectors? Or so i have a setting wrong and am compensating for it on the ve table?
Thanks in advanced guys! Your help is appreciated!
Dead time and idle VE numbers are directly related. Overly low idle VE numbers mean the dead time isn't accurate/correct. Your idle VE should at least be in the mid-high 40's, if not higher. I actually think your entire VE table is low since it's only in the 40's at 100% fuel load and 60's at 190% fuel load.
The correct way is to test it on a bench. That's not really practical for the average user. There are general guidelines for deadtime for "generic" MS2's posted in the MS2extra manual that should hold true for your injector type.
If you switch to batch fire mode and then switch from 1 squirt per cycle to 2 squirts per cycle, you know your dead time is close when the AFR stays the same or is very close to the same. Another methods is to start with .80 and keep lowering it by .10 at a time until the engine shuts off (which is the point the injector can no longer can shut off fuel completely) and once you get to that point add .20 and that is where you leave it. make sure the engine is idling when you do this.
I tried the one method of starting at .80 and droping by.10 until the car stalls and it didnt really "stall" i droped it the whole way to 0.010 it got really lean and struggled to run but still ran. I then did as u said and added 0.2 = 0.210 and then went up the road and attepmted to correct the ve table and it ran pretty rough and seemed to make my table vaules drop even lower?
I also just double check my ohms on my injectors all read 2.4
Whether it actually stalls or not depends on a lot of factors. If you ever end up below .55 or so then it is certainly not right.
The MS2extra link above says .6-.7 for low impedance injectors as a general rule.
I don't know your exact supply voltage but the Holley link above gives you the exact info you're looking for. Just cross your injector with your supply voltage and it gives you the dead time. Looks like it's in that same .6-.7 range if your voltage is "normal".