Air/Fuel Ratio Question

xxxBlakexxx · 02-14-2004, 12:12 AM

What is the ideal air/fuel ratio for the 4.6? How do you have it checked?

surfbeast · 02-14-2004, 10:39 AM

It is checked during a dyno run and costs an additional 10-20 bucks on top of a basic dyno run. The A/F ratio is best when it is around 12.5:1 to 13.5:1 from what I have been told. Abit on the leaner side is said to be better. I'm new to this and have just asked this same question on another board. Hope this helps.

Snakeman · 02-18-2004, 12:11 PM

the optimum a:f ratio is the one that makes the most power with the available fuel without detonation. this can only be determined by monitoring/adjusting during a dyno tuning session. every motor responds differently to timing and a:f changes.

people like me that run a power adder, typically run a richer mixture for safety reasons, while naturally aspirated combinations can be tuned closer to stoichiometric ratios.

02-14-2004, 12:12 AM	#1
xxxBlakexxx Registered Member Join Date: Sep 2003 Location: Mountaintop, PA Posts: 634	Air/Fuel Ratio Question What is the ideal air/fuel ratio for the 4.6? How do you have it checked? __________________ "Children should not get cancer, but they do!" Help a child with cancer at www.homeoftheirown.org My Stang: 2000 Mustang GT Vert - Steeda Tri-Ax Shifter; C&L Plenum; BBK 75 mm TB; Steeda Strut Tower Supports; Black "Deep Dish" Bullet Wheels; FRPP 4.10's; Steeda Subframes; SLP Catback & SLP Catted X-Pipe; SCT 4 Position Chip with 3 custom tunes; Steeda CAI; Venom-1000 Nitrous; Roush Stage 3 Body Kit; Bullet Suspension Package (on the way)

02-14-2004, 10:39 AM	#2
surfbeast Registered Member Join Date: Feb 2002 Location: Maryville,TN Posts: 415	It is checked during a dyno run and costs an additional 10-20 bucks on top of a basic dyno run. The A/F ratio is best when it is around 12.5:1 to 13.5:1 from what I have been told. Abit on the leaner side is said to be better. I'm new to this and have just asked this same question on another board. Hope this helps. __________________ 98 GT / convertable -98 Saleen engine, Saleen appearance pkg. SHM cams,P&P NPI heads, and so much more!

02-18-2004, 12:11 PM	#3
Snakeman Registered Member Join Date: Apr 1999 Location: Grass Valley, CA, USA Posts: 1,389	the optimum a:f ratio is the one that makes the most power with the available fuel without detonation. this can only be determined by monitoring/adjusting during a dyno tuning session. every motor responds differently to timing and a:f changes. people like me that run a power adder, typically run a richer mixture for safety reasons, while naturally aspirated combinations can be tuned closer to stoichiometric ratios. __________________ LX ~vs~ Camaro

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