Hi All
I just hooked up a LM-1 WB AFR meter to sort out my fueling problems with my Paxton Novi 2200 SC setup. I now have an AF ratio of < 9.0 at WOT. Is that way too rich? I just purchased an Xcal and need some advise on 'leaning out' the mixture if I can, with the Xcal. I've been told that on full boost I be to be around 12 AFR at WOT . Any advice greatfully received.
That's way too rich. You run the risk of damaging the cats at that ratio. You can adjust fuel with the Xcal2 but at WOT only. You may want to look at AFR across the entire range and do some datalogging.
I've done some datalogging with LM-1, under normal cruise I'm at ~14.7 AFR. So no problem in closed loop (I think). It's only when I 'mash' the pedal does it go down to about 9. I've attached some jpegs of the log.
Yeah man, that's way rich. Cut small amounts of fuel out until you get to around 11.5 or so at WOT.
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i just got my lm-1 but i didn't hook it up yet. can you tell me if you tapped a 3rd bung or just installed it in place of your old sensor? drop .5 to 1 lb of fuel pressure and see what happened. what about advancing the timeing .5 to 1 degree?
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I doubt there is any way to compensate with just the Xcalibrator. You need to have it retuned by a qualified tuner. As far as advancing the timing ".5 to 1 degree" as suggested above, that is: 1) impossible (how do you advance half a degree?) and 2) irrelevant to your problem. Your fuel map needs a major overhaul which needs to be done by someone who knows what he is doing. By the same token if your fuel is that far off one wonders what your ignition timing map looks like.
With that much fuel in the map, I'm sure the timing table is advanced as far as possible. Yes it IS possible to remove fuel from the tune using the XCal. Just make sure it's done very gradually so you don't go from being super rich to way lean and burn up pistons or something of that nature.
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Sometimes I think that government fits that old-fashioned definition of a baby: An alimentary canal with an appetite at one end and no sense of responsibility at the other.
- Ronald Reagan
With that much fuel in the map, I'm sure the timing table is advanced as far as possible. Yes it IS possible to remove fuel from the tune using the XCal. Just make sure it's done very gradually so you don't go from being super rich to way lean and burn up pistons or something of that nature.
And the only adjustment is for WOT. I'd suggest the look at the entire fuel table.
WOT is the concern of this post as far as I can tell, so the WOT fuel table is what I'm referencing my advice from.
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Sometimes I think that government fits that old-fashioned definition of a baby: An alimentary canal with an appetite at one end and no sense of responsibility at the other.
- Ronald Reagan
i say you take it and get it tuned on a dyno that way you dont wasting too much time. supercharger can be complicated im told. good luck
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aperance mods include. xeon side scoops with louvers,classic chin spoiler,shaker hood scoop,18x10 rear and 17x9 front wheels.painted stripes!
Normal cruise, light to moderate throttle openings 14.5-14.7. So I would say closed loop is fine. The Dip is at WOT, cant hold it there too long, car is going too damn fast!! This is the first 'logged run' I've done using: 1. A New Tune. 2. A LM-1 connected. The WB 02 sensor is in the rear LH bank position. Apparently the standard rear 02 sensors are turned off with this tune, so it's OK to do this. The problem I have is that I'm in the UK, and decent tuning shops are
few, and far between.
Normal cruise, light to moderate throttle openings 14.5-14.7. So I would say closed loop is fine. The Dip is at WOT, cant hold it there too long, car is going too damn fast!! This is the first 'logged run' I've done using: 1. A New Tune. 2. A LM-1 connected. The WB 02 sensor is in the rear LH bank position. Apparently the standard rear 02 sensors are turned off with this tune, so it's OK to do this. The problem I have is that I'm in the UK, and decent tuning shops are
few, and far between.
Rob
You shouldn't be testing AFR aft of the cats. That could be throwing off the results some. You should use one of the front O2 bungs. Temporarily removing the front O2 sensor during testing won't cause any problems.
The plot thickens!
Went for another run and logged the AFR. It appears the dip to 9.0
occurs when I 'lift off'. Is there meant to be a fuel cut off on overrun, when the throttle is closed?
I agree man, relocate that wideband sensor in front of the cats to get more accurate data before making any changes.
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Sometimes I think that government fits that old-fashioned definition of a baby: An alimentary canal with an appetite at one end and no sense of responsibility at the other.
- Ronald Reagan
When is being rich, too much? 
