Make a donation
« previous next »
Pages: [1]   Go Down

Author Topic: Air Fuel Ratios  (Read 1414 times)

Offline E30Dom

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 42
  • -Receive: 76
  • Posts: 2100
Air Fuel Ratios
« on: August 12, 2012, 09:28:34 pm »
OK, can someone explain these to me?

I've done a little research, and always been told that ideal is just over 12... My AFR graph shows my AFR running just above 12 gradually dropping below 12 into the 11's...

Is this getting richer as it's going through the rev range? Or leaner?

This might explaine the soot deposits I've been getting...

Cheers you knowledgeable lot!  :signLOL:

Dom
Logged
Diesel Daily Hack.

Offline Hedge

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 484
  • -Receive: 304
  • Posts: 6621
Re: Air Fuel Ratios
« Reply #1 on: August 12, 2012, 09:39:17 pm »
Richer.
Logged

Offline GrayMK5GTI

  • Global Moderator
  • Just look at my post count
  • *
  • Thank You
  • -Given: 125
  • -Receive: 248
  • Posts: 4165
Re: Air Fuel Ratios
« Reply #2 on: August 12, 2012, 09:40:40 pm »
Richer in the higher revs is good  :happy2:

Component protection and reduced EGT's  :smiley:
Logged
NOW: 2015 Golf R DSG 5 Door, Lapiz Blue, 19s, Discover Nav, Reversing Camera
GONE:2007 Black GTI Edition 30 3dr

Offline E30Dom

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 42
  • -Receive: 76
  • Posts: 2100
Re: Air Fuel Ratios
« Reply #3 on: August 12, 2012, 10:49:35 pm »
If I was to drop from F7 to F8 and this made it run a steadier line just over 12, would this not be better?
Logged
Diesel Daily Hack.

Offline PDT

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 3
  • -Receive: 142
  • Posts: 2010
    • Email
Re: Air Fuel Ratios
« Reply #4 on: August 13, 2012, 12:51:01 pm »
AFR's are not as simple as you might think, theres lots more at play than just rich/lean.

The higher a number the leaner the AFR mixture (air : fuel ratio)

For most direct injection engines an AFR of 12 is 'normal' and is beneficial to dip into the 11's under higher RPM to keep things safer. For older turbo engines 10.5-0.8 is normal, for N/A engines 12.5-12.8 is normal.
Logged

Offline E30Dom

  • Just look at my post count
  • ******
  • Thank You
  • -Given: 42
  • -Receive: 76
  • Posts: 2100
Re: Air Fuel Ratios
« Reply #5 on: August 13, 2012, 02:09:03 pm »
Thanks Dave... And how much difference does a revo F setting usually make?

Dom
Logged
Diesel Daily Hack.
Pages: [1]   Go Up
« previous next »