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Old 11-17-2008, 07:18 PM   #1
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Default Please help with Tuning!

I was able to finally get my MS working last week and been driving around town since, but some problems do arise. First of all, i recently upgraded to hi-res which fixed a few problems but induced other problems. My AE and DE are completely untuned. At times my car idles at a nearly perfect 850 rpm at 13.80-14.7 afr. But sometimes at a traffic light it would just go super lean and attempt to die. When this happens i press on the gas to keep it alive, right when i do this, i hear pinging!
Another problem is when im cruising and let go off the throttle. The car goes completely lean and i feel it surge.
Third problem is AC. At idle when i press on the AC the car goes super lean (19-22).
I will include a msq and a few log files.

BTW this is a 1994 running hi res MS with 480cc injectors. Also, the MSQ is untuned because each time i run it though MLV the car wont even attempt to idle.
Attached Files
File Type: xls datalog200811171417.xls (49.7 KB, 57 views)
File Type: msq megasquirt200811161350.msq (35.4 KB, 89 views)
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Old 11-17-2008, 07:31 PM   #2
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running out to dinner but quick tip: Don't use MLV VEA to tune idle. set min RPM above idle to keep it from doing that.
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Old 11-17-2008, 07:56 PM   #3
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try this now
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File Type: msq megasquirt200811171753 Modified.msq (35.2 KB, 73 views)
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Old 11-17-2008, 08:19 PM   #4
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Quote:
Originally Posted by patsmx5 View Post
try this now
before i try this, any reason why target AFR is set to 19.5?
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Old 11-17-2008, 08:27 PM   #5
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Uh, it shouldn't be. I changed the req fuel and ve table, and maybe one other thing. If it skewed the AFR table, then just export the ve table I put in and import it into your msq. And change your req fuel to what I put in that msq
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Old 11-17-2008, 08:41 PM   #6
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i get 2 errors when i load it up.
WARNING(04): Constant "afrBins1" units mismatch, "Volts" in msq, expected "AFR" from ini.
WARNING(04): Constant "afrBins2" units mismatch, "Volts" in msq, expected "AFR" from ini.

maybe thats why, i just imported my 14.7 table in. So far, at idle its VERY rich. stable at 10.
Pat, do you have aim or something?
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Old 11-17-2008, 08:57 PM   #7
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yeah, it's [email protected]

Try scaling back the req fuel.
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Old 11-17-2008, 08:58 PM   #8
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Ok, here is your MSQ with VE scaled to about 45% of what it was originally. Also included is a log file doing some WOTs down my street. Also, notice the lean spikes in the middle. That is me letting go off throttle while still in gear.
Attached Files
File Type: msq megasquirt200811171653.msq (35.2 KB, 65 views)
File Type: xls datalog200811171646.xls (766.2 KB, 49 views)
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Old 11-17-2008, 11:08 PM   #9
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First map is a stretch of highway. Ignore the Idle AFR, i fixed it on the next map.
The other map is a quick and not a good log from the street leading to my home. Idle fixed this time.
Attached Files
File Type: xls datalog200811171829.xls (1,014.2 KB, 43 views)
File Type: xls datalog200811171841.xls (488.3 KB, 66 views)
File Type: msq megasquirt200811171846.msq (35.2 KB, 84 views)
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