closed loop gub

hackish · Post by **hackish** » Sat Jun 23, 2007 12:21 pm

!erehT iH I've been having a lot of problems getting the low throttle stuff tuned so I tried enabling open loop to see if it could correct anything... I found an interesting bug. Using the .44 rom I enabled open loop on a really lean idle mixture. It started around 20:1 AFR and slowly the fuel trim increased bringing the mixture as low as 15.5. Then the fuel trim value wrapped back to \"0\" and the process repeated itself. Steps to reproduce this problem... Create a base map on any given car that still has the O2 sensor installed. Enable closed loop operation and remove some fuel from the idle part of the fuel map. Watch as the O2 trim goes up until it wraps around. -Michael

Post by **calvin** » Sat Jun 23, 2007 4:47 pm

that's default i believe has to do with min/max mixture... But i'll test. Narrowband or wideband?

Post by **Gaskleppie** » Sun Jun 24, 2007 4:35 am

What did you do with VE? Leave it on? Wich closed loop checkbox did you use?

hackish · Post by **hackish** » Sun Jun 24, 2007 1:03 pm

I believe VE was off. I just unchecked the closed loop and O2 buttons. The wideband's NB output was not hooked up - I was using a real narrow band sensor as the customer had a wideband bung installed as well. -Michael