stalling and VE table question
#1
Junior Member
Thread Starter
Join Date: Sep 2011
Location: Chesterfield, VA
Posts: 252
Total Cats: 2
stalling and VE table question
For the last week I've let VE Analyze Live work on my VE table. Now sometimes at idle, after driving, in hot weather, the car stalls. VEAL keeps wanting to jack the VE up sky-high in the low RPM/low MAP area. See attached image.
Thoughts? Suggestions?
Thoughts? Suggestions?
Last edited by travisb; 05-27-2012 at 06:14 PM.
#3
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,493
Total Cats: 4,080
lol at your VE table at idle.
the issue is your AIT-density based corrections, or lack there of. Adjusting the dead times will not solve the issue of the ideal gas law code pulling a lot of fuel when the AITs get hotter than 80°F causing really lean idle and overcompensating with that horrible fuel map.
the issue is your AIT-density based corrections, or lack there of. Adjusting the dead times will not solve the issue of the ideal gas law code pulling a lot of fuel when the AITs get hotter than 80°F causing really lean idle and overcompensating with that horrible fuel map.
#5
Junior Member
Thread Starter
Join Date: Sep 2011
Location: Chesterfield, VA
Posts: 252
Total Cats: 2
Thanks.
I attached the tune and log from Saturday when it cut out several times.
I also attached the tune and log from this morning. I had to trim the log to upload. The revs dipped some this morning, but it did not cut off. It wasn't too hot out yet.
I attached the tune and log from Saturday when it cut out several times.
I also attached the tune and log from this morning. I had to trim the log to upload. The revs dipped some this morning, but it did not cut off. It wasn't too hot out yet.
#7
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,493
Total Cats: 4,080
yeah, look at your Gair log on 2012-05-26_16.19.34.msl, in places it's hitting 142%....so you're adding 42% more fuel at a given air temperature.
and you're tuning against this causing you to have horriblly awful VE% numbers in your table.
you need to tune the clt-based air density table curve in such a manner that you negate any code trying to add/subtract fuel. I can't remember what the table value that work for msI are, I'd have to look for them. But your current table is WAYYYYYYYYYYYY too agressive and causing you to dump in and acutally pull out too much at a given air temp. So turn on the Gair gauge on your virtual dash and start manipulating the curve so it stays at 100% all of the time.
youre going to to have to retune your fuel map afterwards. I'd acutally move your first 4 table values back to the 35VE% area to match the rest of your table and go from there.
and you're tuning against this causing you to have horriblly awful VE% numbers in your table.
you need to tune the clt-based air density table curve in such a manner that you negate any code trying to add/subtract fuel. I can't remember what the table value that work for msI are, I'd have to look for them. But your current table is WAYYYYYYYYYYYY too agressive and causing you to dump in and acutally pull out too much at a given air temp. So turn on the Gair gauge on your virtual dash and start manipulating the curve so it stays at 100% all of the time.
youre going to to have to retune your fuel map afterwards. I'd acutally move your first 4 table values back to the 35VE% area to match the rest of your table and go from there.
#15
Junior Member
Thread Starter
Join Date: Sep 2011
Location: Chesterfield, VA
Posts: 252
Total Cats: 2
Ok, I added the Gamma Enrichment gauge and tuned the Coolant Related Air Density so that the G E was around 100%. I couldn't do the whole table because it is already 85 degrees out.
Attached is a screenshot of my Coolant table and the gauge too, just in case any other MS1 users want to see the gauge.
When it was at 100% I let VEAL take over and update VE and my AFR started coming into a better range.
Does my coolant table look like I'm doing the right thing??? What kind of temperature range should I cover? It seems better...
Attached is a screenshot of my Coolant table and the gauge too, just in case any other MS1 users want to see the gauge.
When it was at 100% I let VEAL take over and update VE and my AFR started coming into a better range.
Does my coolant table look like I'm doing the right thing??? What kind of temperature range should I cover? It seems better...
#17
Junior Member
Thread Starter
Join Date: Sep 2011
Location: Chesterfield, VA
Posts: 252
Total Cats: 2
Thanks, I've updated my table. See attached. Is 80-140 degrees an appropriate target for this table?
I have another question. I have it set to start reducing correction at 2000rpm and end correction at 3000.
This morning when I was on the highway at 3500-4000 rpm the GAir was at 96% or so. Since correction should have already stopped, do I need to worry about trying to get that to 100? Would that be through adjusting the VE table to narrow it in?
I have another question. I have it set to start reducing correction at 2000rpm and end correction at 3000.
This morning when I was on the highway at 3500-4000 rpm the GAir was at 96% or so. Since correction should have already stopped, do I need to worry about trying to get that to 100? Would that be through adjusting the VE table to narrow it in?
#18
Junior Member
Thread Starter
Join Date: Sep 2011
Location: Chesterfield, VA
Posts: 252
Total Cats: 2
Thanks Brain. I have Gair somewhat under control. It was between 98-101% this morning commute. The VE table is starting to smooth out and AFR is getting much more steady.
Can you take a look at the attached picture? It is a scatter graph from this morning showing AFR vs MAP vs Gair.
I have a few (dark blue) dots above 100MAP and 14 AFR. Do I need to worry about those few?
Also, under low MAP, usually while decelerating I hit very high AFR. 21.7 or whatever the max on the scale is. Is that a concern? I do have over run at >2k rpm, <20kpa.
Can you take a look at the attached picture? It is a scatter graph from this morning showing AFR vs MAP vs Gair.
I have a few (dark blue) dots above 100MAP and 14 AFR. Do I need to worry about those few?
Also, under low MAP, usually while decelerating I hit very high AFR. 21.7 or whatever the max on the scale is. Is that a concern? I do have over run at >2k rpm, <20kpa.
#19
Tour de Franzia
iTrader: (6)
Join Date: Jun 2006
Location: Republic of Dallas
Posts: 29,085
Total Cats: 375
lol at your VE table at idle.
the issue is your AIT-density based corrections, or lack there of. Adjusting the dead times will not solve the issue of the ideal gas law code pulling a lot of fuel when the AITs get hotter than 80°F causing really lean idle and overcompensating with that horrible fuel map.
the issue is your AIT-density based corrections, or lack there of. Adjusting the dead times will not solve the issue of the ideal gas law code pulling a lot of fuel when the AITs get hotter than 80°F causing really lean idle and overcompensating with that horrible fuel map.
good job getting your stuff fixed.