After installing my LC-1 WB02, I've been cleaning up my AFR curve with Enginuity. However, I quickly noticed some strange behavior. My logged AFR numbers are normal (hovering around 14.7) at idle and during closed loop, but during higher load (2.0+) actual logged AFR numbers are between 1-2 points richer then map targets. Leaning out the open loop target AFR map did enable the car to run ~11:1 at WOT, but only with target AFR's up around the 12.5 range. Since target and actual AFR are so far off, and I'm running the stock airbox, I do not believe this is a tuning issue (some have suggested re-scaling the MAF). In addition, there appear to be no boost leaks, as WGDC and logged boost behave normally, and I have no trouble hitting target boost. My question is this: Where should I be looking for a leak? What would be the best method to do so?
Normal values in both current and learned fuel corrections. So, between +-5 for current correction, and all of my learned corrections (other then AFL D, which is at zero) are right around -1.4. And yeah, I even checked fairly thoroughly for exhaust leaks, and found none.
Have you tried logging using LogWorks to verify it isn't an Enginuity issue? My target vs. actual AFR has always been dead on with my car, fyi. Your 14.7 afr reading is from the wideband, correct?
I also have the XD-16 gauge, and the values the gauge displays are the same as those Enginuity logs. I'll give logworks a shot, however. Yeah, the 14.7 is from the wideband. What do you mean by this?
Ok, so it sounds like it isn't a logging issue. How long have you been using the wideband for? Were your target AFRs in line with actual output, or has your current issue always been the case?
When I summon an 11:1 afr in Enginuity, I get 11:1 on the wideband (and not 6:1 or 13:1 or anything like that).
It's been installed for about three weeks. The high load AFR's have always behaved this way, so I have no other baseline to compare to. Everything else on the car behaves normally. Even when I log rich AFR's, the car doesn't seem to stutter or bog at all, and all other logged values seem on target. If the wb02 gauge wasn't right on target for idle/cruise, I would swear it was reading incorrectly..
It sounds like you have a bit higher fuel pressure than what the ecu is expecting with regards to injector on-time. I've seen this quite a bit, but typically the other way -- call for 11:1 and get 12:1. An easy way to fix this is to simply adjust your injector scalar. If your error is X% on the rich side, increase your injector scalar by X%. A larger value will lean out fueling and a smaller value will richen AFRs in open loop.
Welcome to the wonderful world of tuning cars. Have seen it a bunch of times and there really is no "true" fix for it. If your trims are good, I would just lean out the map. If your trims are off a touch, you can mess with the injector scale, but then you will probably have to go back and mess with the maf scale to get your trims correct elsewhere. Russ
Ah. I hadn't thought of playing with the scaler to fix the problem. Your suggestion would lead to massively changing the scaler, which I think would skew other things up as well. Something like this: 10.8/12.3 = ~.88 1.12*550.67 = 616.75 However, I may try playing with it a bit, as the idea is sound.
It may seem like a massive change numerically, but in reality it isn't. It was rather unnerving the first time I filled up with e85 and went from a 550 scalar down to 429 or so. You should have seen the scalar swings necessary when futzing with Jason's 1000cc injectors.....:eek4: The idea has been very well tested by me on my car (especially when dinking with e85) and on several other cars. I'm at the point where I can get it nailed down with at most 2 flashes. Move your map back to 11:1 targets and then report your wideband readings. From there, we can figure out what to set the inj. scalar at. The actual formula is: new_inj_scal = inj_scal / [ 1 + {(wbo2 - target)/target} ] As always though, play at your own risk.
So, based on the above example of a target afr of 12.3 and a wbo2 reading of 10.8: new_inj_scal = 550.67 / (1 + (10.8-12.3)/12.3) = 550.67 / .8780 = 627.15 Doing this should net you ~12.3:1 afrs on the wideband; just as the map calls for.
Yup, thats the calc I quick wrote up above (with a large percent of rounding). I'll give it a shot when I get a chance to pull some more extensive logs.
