• Mazda 6 MPS • UK member

[skiptownmcat]

Could be caused by a rich mixture too. That would point to a possible O2 sensor issue.

The lambda came out at bang on 1 though?

[Steve @ VersaTune]

My best guess is that it's probably caused by the single aftermarket Cat.

[kevstewart]

I installed the Map you done for me today Steve... No more boost spikes, very impressed.
Hits 15psi and holds.... I'll do a log tomorrow for you to have a look.
What's best way to drive when doing a general performance log? Also I'll do a log for setting up my maf

[Steve @ VersaTune]

General performance - 2000 - 6200 WOT 3rd gear if legal and safe to do so. Also a WOT 2-3 shift to see if it is spiking on the shift.
MAF Cal - read the MAF Cal how-to here

[kevstewart]

Will do that tomorrow, I've got a private road good for testing... Although 6th gear is a bit scary
Thanks Steve

[skiptownmcat]

My best guess is that it's probably caused by the single aftermarket Cat.

Steve, just looking at my idle commanded afr. It's coming in at 14.58:1, it should be 14.68:1? This might be giving me the extra carbonmonoxide emissions? Can I change this anywhere?

[Steve @ VersaTune]

You can modify the closed loop AFR table to adjust idle AFR target. If you get too lean, NOx may creep up.

[skiptownmcat]

In that table it says 1 lambda right through the 500-1500 rpm range, so why does my dashhawk say 14.58 for commanded afr? Strange!!

[Steve @ VersaTune]

Could be a rounding error on the scaling. The ECU outputs lambda. Anything that logs in AFR is just multiplying the lambda value.

[kevstewart]

got some logs done tonight, see attatched:

any advice appreciated...