one bank rich, other bank lean?
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Joined: Dec 2001
Posts: 426
From: Slidell, LA
one bank rich, other bank lean?
Ok, for the past year and a half, I never had the speed sensor connected on my LT1 swap and my car was running lean. I got Datamaster over Christmas and made some recordings, both banks were running pretty much even as far as fuel mixture is concerned.
Fast forward to Spring Break. I finally connected my speed sensor and get it working right. I went to the track a number of times, ran .3 and 1 mph faster with some drag radials. I also took some recordings of a number of the runs to see how everything was looking. Now, instead of the banks running pretty close together, I'm getting an intermittant left bank rich/right bank lean condition where my BLM's are getting pegged at 108 and 160. This doens't happen all the time, only occasionally.
My next area of concern is the fact that on average I am hitting over 80% DC on the injectors throughtout the runs. I was under the impression that anything over this was considered pretty high.
Finally, on one of my 1/8 mile runs in which I was getting the rich/lean condition, Datamaster is showing I hit 82.1% DC on the left bank, while I hit 99% DC on the right bank, peaking at 104% when I shifted from 2nd into 3rd. Whats the deal here?
I'll post up links to the Datamaster files, labeling the 1/4 mile and 1/8 runs, as well as which ones were fairly even and which ones had large discrepencies between banks.
Thanks for any help. I'd like to get this straightened out before I head to the track again this summer. I had wanted to get a 52 mm TB, but after seeing this, apparently I'm going to be needing larger injectors as well.
*Edit* Got the files uploaded. Go here
Fast forward to Spring Break. I finally connected my speed sensor and get it working right. I went to the track a number of times, ran .3 and 1 mph faster with some drag radials. I also took some recordings of a number of the runs to see how everything was looking. Now, instead of the banks running pretty close together, I'm getting an intermittant left bank rich/right bank lean condition where my BLM's are getting pegged at 108 and 160. This doens't happen all the time, only occasionally.
My next area of concern is the fact that on average I am hitting over 80% DC on the injectors throughtout the runs. I was under the impression that anything over this was considered pretty high.
Finally, on one of my 1/8 mile runs in which I was getting the rich/lean condition, Datamaster is showing I hit 82.1% DC on the left bank, while I hit 99% DC on the right bank, peaking at 104% when I shifted from 2nd into 3rd. Whats the deal here?
I'll post up links to the Datamaster files, labeling the 1/4 mile and 1/8 runs, as well as which ones were fairly even and which ones had large discrepencies between banks.
Thanks for any help. I'd like to get this straightened out before I head to the track again this summer. I had wanted to get a 52 mm TB, but after seeing this, apparently I'm going to be needing larger injectors as well.
*Edit* Got the files uploaded. Go here
Last edited by 92LT1RS; Mar 31, 2004 at 06:30 PM.
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From: Hell was full so they sent me to NJ
If you "export as .csv" from DataMaster, you get a file that everyone can look at using Excel of 1-2-3, rather than limiting viewing of the .uni files to people who have DataMaster.
The duty cycle numbers I have seen come out of DataMaster appear to be screwed up... with near stock engines sometimes showing 100+% duty cycle. I think there is something screwed up in the program, and I've told many people to go back to TTS and ask for an explanation, but so far I don't think anyone has done it.
The duty cycle numbers I have seen come out of DataMaster appear to be screwed up... with near stock engines sometimes showing 100+% duty cycle. I think there is something screwed up in the program, and I've told many people to go back to TTS and ask for an explanation, but so far I don't think anyone has done it.
Thread Starter
Registered User
Joined: Dec 2001
Posts: 426
From: Slidell, LA
I'll do the export thing as soon as I get back from class.
Didn't know about the duty cycle problems with Datamaster. However, the numbers I'm getting make sense and correspond with the BLM counts I'm getting.
Didn't know about the duty cycle problems with Datamaster. However, the numbers I'm getting make sense and correspond with the BLM counts I'm getting.
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