Commanded AFR not equal to WBo2 AFR at idle.

[maudyZ28]

thanks for this update, just read the thread good work,

i've been having some surging about the same RPMs but running a modified Z06 spark table rather than my stock camaro 99 one. Might edit a few low MAP low rpm cells to see if spark advance helps.

[macca33]

Thanks lads.

Maudy - I simply recreated the issue in a couple of logs, then when I reviewed the logs and located the offending cells, had a play with the timing. I referenced the oem tune for that given point and it showed that my timing was a bit low in comparison to oem tunes that I had. My timing had also been blended in the original tune, so the timing figures were slightly different across the load points in question. I simply raised the timing by a degree in one rpm row and a few degrees in another row - then made the timing figure consistent across a few load points and the improvement was immediately apparent.

I'll try to upload both tunes later today.

cheers

[macca33]

G'day again all and Happy Easter.

A while back, I became concerned that the TE 2J9 may have been faulty, as the recorded AFRs on a dyno contrasted to those detected by the 2J9. I was commanding 12.87:1 - confirmed by the dyno WBo2, but the 2J9 kept telling me I was lean - out to 13.5:1. I tried the same comparison test on another dyno and the same error - with the same differential - resulted. I also checked my WBo2 and spark plugs and noticed evidence of richness.

I contacted TechEdge and discussed my issue, resulting in a new 2J9 being sent out to me. I've conducted some SDautoVE work and can happily say that the new unit is reading accurately - so it is full steam ahead once again. Naturally, it is a pain to have to re-do the entire VE table (I would guesstimate that it was approximately 4-5% out across the entire table), but it will be good to have it all running properly - finally!!!

cheers

[joecar]

Hi macca,

Was this with serial comms or analog connection between the 2J9 and V2...?

Glad they have you a new one that's good customer support.

Let us know how your tuning goes.

Happy Easter.

[macca33]

G'day Joe. Serial connection mate - via one of TAQ's cables. I was always suspicious that the car was running rich - exhaust pipe (and sparkplugs moreso) don't lie. I, however, placed my faith in the 2J9, until the dyno runs confirmed it was very rich at WOT, thus leading to the conclusion that it would be rich throughout - which I have now proven to be the case.

TE were very good - as you'd expect - and I'll be getting the VE Table up and running again soon.

cheers