Tuning under boost.

Danny · Post by **Danny** » Thu Mar 02, 2006 4:09 pm

I have been playing around running my boosted engine on petrol with my megasquirt (It was dedicated LPG). I have got it running ok, tonight I decided to try doing some data logging which worked fine, but after looking over the log I noticed something odd. Under boost the dash lambda read out and megasquirt read out both say the mixture is rich, yet in the logs its says the O2 is as low as 0.3 in some places. Cant understand why the lambda readouts were not showing lean. Any ideas? Am I missing something?

Cheers
Danny

calrewire · Post by **calrewire** » Thu Mar 02, 2006 4:22 pm

are you using a wideband o2? If you are lambda is opposite of a narrowband o2

jakobsladderz · Post by **jakobsladderz** » Thu Mar 02, 2006 4:31 pm

0.3 lambda is extra-ultra dead rich, most engines would be coughing and spluttering well before then .. I would suggest that there may be a calibration problem perhaps.. If it's narrowband volts it is a little lean (but maybe too short to see.. when was it in the driving cycle. Wideband, don't know..

Danny · Post by **Danny** » Fri Mar 03, 2006 2:39 am

Its a norrow band, If it is reading 0.3 volts yeah it is very lean and im supprised I aint had detonation. I was just woundering why is was showing rich in mega tune, yet lean in the log.

Minami Kotaro · Post by **Minami Kotaro** » Fri Mar 03, 2006 4:10 pm

A NB02 is worthless for tuning under boost. You should get a wideband asap.