Jump to content

HOWTO: Individual cylinder fuel and spark trim


Roland@pcmtec
 Share

Recommended Posts

If you wish to trim individual cylinders due to one cylinder running hotter than the other there are two global fuel and spark modifiers you can change.

auF12418 "Calibration adders to spark angle for development and testing purposes"

This value will be added to the final spark value per cylinder. Eg to remove 1 degree of timing from cylinder 6 you would change this table to the following:

image.png.4434f3894c35523bfec8dc3e44d8c6ef.png

auF10362 "Fuel modifier per cylinder"

This is a simple multiplier for the commanded fuel mass. Eg to run one cylinder 5% leaner you would modify the table by the following amount.

image.png.b79f15182738f3e3cc4c543a68fde036.png

  • Like 7
Link to comment
Share on other sites

  • 1 year later...

Hey Roland, thanks for this explanation.  What does the "0" cylinder reference too ? Does 0 reference cylinder 1 ? And cyl 5 to be cylinder 6 ? If not, what does changing 0 do ?  . Also in the event of one bank being lean in a fg 5.4 V8 . Ie passenger side bank.  Would it require cylinders 5,6,7,8 to be adjusted ? Regards , Joel .

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.

Guest
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.

 Share

×
×
  • Create New...