Originally Posted by satisfied (Post 1265866)

So after months of fighting with BEGI finally got all my parts together.

Lessons learned.

Turboing a miata properly is a $5k+ endeavor. No shortcuts, no work arounds, no "i'll upgrade laters" Do it all at once, and do it right.

Don't buy an AEM UEGO.

First baseline tune, didn't work at all, AEM AFR was VASTLY DIFFERENT from what Tunerstudio told me it was. I did something to the target input values vs AFR reading that took me about 4 hours to figure out after my buddy with a stupid awesome vvt turbo couldn't figure out why my AFR's were so fucky.



So on my Rev built MSPNP2 I got a new baseline tune (thanks rev!) on there after all the mods were "done" and it idled fine; died upon even THINKING about applying throttle, but the AFR reading on the Tunerstudio would only go between 12.1 and 13.6 despite the actual AFR's being anywhere from 10.9 to 17.3 (beyond 17.3 I just get 3 dashes.)

I read and read and realized the poor AFR reading was tricking the MS into thinking my AFR was good under all variables (kPa's changing and whatnot) and therefore not adjusting the fuel accordingly!

So I went back into the AFR calibration menu and saw that there was NO WIDEBAND SELECTED! (How in the hell?) so I selected custom WB (as there's NO OPTION IN MSPNP2 FOR THE AEM UEGO WITH THE LSU 4.9 BOSCH SENSOR [the other presets don't work either!]) and I can't figure out what I did last time to make her read right!!!

So I lost idle again. Help?

:hatecat:



I am a radar technician who specializes in micro, miniature electronics repair, I have my AEM UEGO wired 3" beyond the harness that goes directly to the MSPNP2 as everyone said to get the ground as close as possible to the MS's ground. I figured electronically THAT'S AS CLOSE AS I CAN GET. They are semi-stripped, wire wrapped, soldered and heatshrunk over. I really doubt it's my wiring, unless you REALLY insist.
:facepalm:

Originally Posted by satisfied (Post 1265963)

The voltage VS AFR readout calibration table AEM and everyone else provides doesn't work. 0v = 10.00 : 4.99v = 19.98.

When I input that it will read 23.46 in tunerstudio ALL DAY, DUMP FUEL into the engine and spew black smoke.

When I tried removing the decimal on the SECOND AFR range so inputting "1998" instead of "19.98" it actually went down to 10.10 but was also CONSTANTLY sitting at 10.10.

Then I tried fucking with the voltage ranges.... It worked the first time I tried this back before I had this better baseline tune, but I can't get it down! It just stays off. Not just off, but entirely frozen in place at an inaccurate value. It's useless to me to try to tune off these values, and the fuel spraying out of my exhaust can't be a good sign.

Anyone have anything?

Originally Posted by satisfied (Post 1266031)

Redid all of the wiring, checked from the sensor forward. It's all good. Remade solder connections, and retested. Same shit. My current readings are 0v = 5.8AFR 4.98v = 1700 AFR. That's right, 1700 NO DECIMAL.. Adding the decimal makes it read HIGH like 26.7 high, and frozen. I have NO FUCKING CLUE what the issue is. As of now, I can only get it to read between 11.1-13.00 although the ACTUAL AFR on the gauge can shoot between 10.6 and 17.3 then die.

What the fuck is going on here?

I can only work on the car on weekends because I effectively work 16-18 hours a day.

This is supposed to be MSPNP2 not MS pull your hair out, smash car with hammer, buy mazdaspeed miata instead 2.

Originally Posted by satisfied (Post 1266118)

I'm going to throw a meter on the UEGO next weekend and see if the analog output is going anywhere, or if it's off, AEM packaged the wrong sensor or any other weird ass thing that only ever happens to me. The wiring is all good, I just didn't bring my fluke today. I will on Saturday next week and see what happens, and maybe bring a spare UEGO in its entirety and see what the fuck is happening. If that goes nowhere and no one has anything I'm just going to sell the whole MS setup and rock the RRFPR, there's no way the drivability can be any worse than yknow... Not moving at all.

Originally Posted by 18psi (Post 1266126)

1) a rev build ms2 is a not an mspnp2. I moved your thread to megasquirt section
2) Are you using analog or serial out from the uego?
3) Your title makes it sound like rev did something wrong or sold you a unit that's not pnp. it sounds like you fail and it's user error. last time that none of the settings lined up for me, I did custom and just adjusted the 4 values until it was dead on. It's worked perfectly since. It's gonna plot linear, so it really doesn't matter what values you use to "calibrate" it in TS

Just sayin

Originally Posted by satisfied (Post 1266136)

Analog output from UEGO, white wire to Red Blue wire on pin 2/N from the harness.

Originally Posted by Reverant (Post 1266147)

In the printed instructions, page 3, step 29:

There are 7 wires on the back connector (depending on your request):
- snip -
• Yellow - Wideband input. Connect this to your wideband analog output
- snip -

Originally Posted by Reverant (Post 1266256)

Topic title change?

Originally Posted by Reverant (Post 1266256)

Topic title change?

Originally Posted by 18psi (Post 1266178)

So user error it was after all. Okay