a/f logs with stock ecu controlling fuel? or your map and a/f logs? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-07-2006, 04:29 PM   #1
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Default a/f logs with stock ecu controlling fuel? or your map and a/f logs?

hmm.. does anyone happen to have any a/f logs form the stock ECU controlling fuel?

I just hooked up my LC1 and i'm a litle concerned that it's not working quite right as when i'm at part throttle with my map, it's pegged at 19.xx for a lot of the time. of course, this is while idling and just blipping/holding the throttle. it looks a little better with the stock ecu controlling fuel... but still not spectacular...

Going to try and drive around a bit and capture some logs to see if i'm nuts or not...

anyone?
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Old 10-07-2006, 05:19 PM   #2
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How does it read at WOT with stock fuel? I seem to remember being surprised, it was at about 10.75-11afr. also it should read 14.7 at idle.
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Old 10-07-2006, 06:06 PM   #3
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with teh stock ecu controlling fuel it's definately in the 13.5 - 14 range, btu i haven't ripped it at WOT yet.

i should know more by tonite. part of me hopes it's right, but that means my tune's been INSANELY lean at times... oh well, it's still running. no harm no foul, right? ;-)
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Old 10-07-2006, 07:21 PM   #4
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Quote:
Originally Posted by devin mac View Post
my tune's been INSANELY lean at times...
Hmmm, I may not autox on my Squirt tomorrow then. Please post something about your results tonight seeing as we have the same MSQ.
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Old 10-07-2006, 11:51 PM   #5
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Did you calibrate it in air before you ran it? There is no way that map is that lean the car would stall.

Are you looking at the wideband data through the MS or the utility that comes with it?
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Old 10-08-2006, 12:25 PM   #6
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i got sidetracked yesterday so i dind't really have a chance to play around with it. hopefully today i can go capture a couple of logs and see if i feel better or worse about my installation. i definately calibrated it in free air before i screwed it in, though i might re-calibrate again today.

for install, i tapped into the power wire that is powering the MS, for system and analog ground i tapped the MS ground wire (which, via kingofl337's plug'n'play setup are the stock ECU power and ground wires, effectively). i ran the heater ground out to the engine bay, and then analog 1 to the narrowband's signal wire, and analog 2 to the MS. analog 2 then got reprogrammed to send 0-5v for 10-20:1 AFR, via the LC1 programming tool, and the MS got reconfigured to accept the 0-5v as 10-20:1 afr.

finally, that black calibration wire got hooked up to the LED and the momentary switch, and then the LED and switch outputs were grounded to the same place on an in-cabin ground.

i honestly can't think of anything to do differently, except possibly changing the grounding locations.

anotehr issue i've noticed i have is that if i start the car, and the LC1 shows up reading the a/f on the MS, and then i stop the car and turn it right back on, the LC1 usually won't start right back up again. however, if i leave the car off for about a minute, it works fine and turns on with the MS (since it gets power from the same place). is this somewhat normal?
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Old 10-09-2006, 10:00 AM   #7
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It could be in the heater circuit of the WB02. It might need to cool before restarting or a certain time delay.
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Old 10-09-2006, 10:14 AM   #8
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yeah, that was my thought. I'll recalibrate the sensor and make some pulls today at WOT. i can't imagine how i could ahve screwed this up, tho... lol
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Old 10-09-2006, 02:24 PM   #9
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when you first install it, it needs 2 minutes calibrate to air before it sees any exhaust gas. Many people in a hurry to play with the new toy, just install it and start the car right up.
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Old 10-09-2006, 03:50 PM   #10
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nah, i followed the install guide to the letter. the only thing i could think of is that after i calibrated it in free air, i had to unplug the sensor so i could screw it into the bung, then plugges it back into the controller. i don't think this should be an issue, though.

we'll see, i'll play with it tonite some and report back.

-D
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Old 10-09-2006, 04:36 PM   #11
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off topic but whered you mount your controller?
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Old 10-10-2006, 11:06 AM   #12
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i zip-tied it to the AFM for now. i figured when i remove the AFM i'll find a better plac for it. turns out i might have to look sooner because i think the sensor is overheating in the stock O2 sensor location.

basically, it'll turn on (indicated by actual readings of O2 on megatune, and the LED indicator light that ya hook up to the LC1 black calibration wire) if the car is cold. if i drive it around for awhile, then shut the car down, the LC1 will NOT come back on. sound like an overheating sensor?
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Old 10-10-2006, 11:22 AM   #13
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Did you buy it from DIY? Give em a call maybe they can help you.
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Old 10-10-2006, 12:16 PM   #14
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no, ordered it directly from innovate.

it's only frustrating because this is possibly one of the simplest mods i've ever done, and i've taken more time to make sure i didn't screw it up. lol.
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Old 10-10-2006, 12:48 PM   #15
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just got off the phone with Innovate and was told the stock O2 sensor location should be just fine. said the likely culprit is either a faulty unit or my power/ground.

this is kinda tough to imagine, since the MS power/gound i tapped into are basically the stock ecu's power/ground as per kingofl33t's
miatasquirt" installation.
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Old 10-13-2006, 10:15 PM   #16
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Yeah, the power comes from the main relay. So, it should be fine.
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