Jump to content

Recommended settings for closed loop


Recommended Posts

Hi all,

Just wondering what the best settings would be on the closed loop lambda setup would be, I have an MOT on the car on Monday, have set the AFR table to be at 14.7:1, timing set to I think 12 degrees, using the auto fuel (wideband) option eg it looks at the AFR table and adjusts the fueling. I did try the Stoich (wideband) option for closed loop but didn't find that to really work that well, I guess its probably mainly used on cruise, I have done my best to adjust the fuel table to be as close to 14.7 as I can with the closed loop lambda tweaking the last bit - think I saw the fuel trim to be at around 3%.

My main question is what frequency I should set the adjustments to, I believe as stock its set to adjust 4 times a second, would it work better if I increased this - eg it would adjust fueling quicker or would it just make it too jumpy?

My main concern with the MOT is the Lambda needing to be at 1 (plus or minus 3%), the cat itself is fine and I think I should be ok with the timing set to 12 degrees (service manual for the engine states idle to be between 10 and 14 I believe) - just want to make sure that the wideband adjusts to stoich as quickly as possible.

Also, is it best to have a more advanced timing or retarded timing for ignition with regards to emissions?

Link to comment
Share on other sites

2 minutes ago, dobsondynotune said:

i would speed up the rate of change to help keep it stable 

this adjustment is found in the closed loop lambda rate table 


Thanks for that, I think I bumped it up to 8 in the lambda rate table, not sure how far its worth worth going to.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...