jeepguy553

I thought I had the idle nailed down, but it would appear that I was wrong. I have been running, tuning, and burning all day. I have good stuff in the upper end and mid range stuff and that is getting lots better...BUT...
I keep having to change my idle VE in the VE1 table. This is bizarre. It is down to 9.56 at 800 rpm and 40kPa and I bet I can get to nothing if I really want to. Is this a problem that requires a VE2 table change? I am starting to think so. I also got a pop out of the TB earlier...not good, but I know what that is...timing advance.
HELP!!!!

Grumpy

Cut and paste you VE and VE adder tables and post em here.

jeepguy553

VE1 table

jeepguy553

VE2 table

JPrevost

Just looking at those tables and I can see a few "issues" if you may. First off in the VE2 adder I see a jump of 12% between 3200 and 3600. Combine those tables and graph the results. You'll see what I'm talking about. Not to say that you shouldn't give your engine what it wants but I would recommend keeping the tables pretty smooth without many divots. Grumpy will tell you to give the engine what it wants but if you're using 160 baud ALDL then trust me on this one, keep it smooth. Dips in the tables will mess with your AE and transitions. The only time for dips is to force the engine to do something abnormal. Basic physics says that if you have more pressure then the volume of air is greater hence Vol eff of an engine should always be increased with pressure, never the other way around.
How are you going about tuning the vol eff tables? BLM, INT, and/or O2?
I don't know because I haven't played with it much but I think the 61 mask is aggressive with the idle SA adjustments. I really haven't played with it much but I still get a stumble almost stall every once in a blue moon. This was messing with me and I haven't checked the o2 sensor. I haven't done much tuning as of late, I usually do a couple changes, pick what I like best and drive around with it for a few weeks taking mental notes.
If it helps, the VE "curve" should look like your torque curve. This is just a suggestion and might save you some time; slap on a carb and program in a typical ignition curve, chassis dyno it making certain the AFR is pretty good (not too rich and not too lean), then look at your torque curve results. This will get you a peak for your vol eff curves. I was going to do this but had access to some very powerful simulation software.

jeepguy553

Thanks gents! I have a good idea of what the tq curve should look like from DD2000. I just made some changes to that VE2 table and I'll let you know the results later. I really hope it cleans up the mess I made of it. My VE1 is pretty smooth, IIRC. That's one thing I do when I am tuning. I'll make the changes then look at points around the one I just changed and bring them in line as best I can by eyeball.
BTW...Jon, now I know what you meant about that big TB stalling the engine. If I let it sit on 3K for a sec or two then let off the throttle really abruptly, it will nearly die. You can see it in the logs because it will drop from like 2800 rpm to 575 almost instantly. Is that just the TB closing or can I time that out too?

Brent

iTrader: (1)

Jeep, your ECU file has the VE1 table backwards.

Should look like this:

jeepguy553

I thought I had fixed that! Maybe I am using the wrong ECU. I switched them a couple of times this weekend and it is very possible that I screwed up when I selected the one I am using.
That might explain some of this.