07-23-2014, 11:12 PM #1
I am working on something and need to know what it the ideal AFR for 4-tec engine, does this ideal AFR have different numbers for different RPM's and what is minimum and maximum SAFE AFR.
I need numbers and know that in real world they are not constant. Need it as value
07-24-2014, 01:00 AM #2
mids below boost 14.5
07-24-2014, 01:11 AM #3
07-24-2014, 01:18 AM #4
you cant have a perfect number.. climate changes for everyone too many variables play.... those numbers are a good base... on a hot humid day the fueling will be richer than it was on a cooler day or evening without touching it.. in the cooler months that why you need to add fuel and in the warmer months you in most cases will need to drop a bit of fuel pressure so your not as rich.
trust me ive been threw all the fueling blahs.. without spending 1000 bucks on a cmd. only way to be perfect for adjusting climates is to have a CMD or fuel controller so it will adjust on the fly without you worrying. first you need to know what kind of setup you want to run and how fast you want to go and then I can tell you or many others what works and doesn't. but to answer your question no there is no number you can have because there is no perfect AFR because climate plays a huge role in these 4tec engines making power
07-24-2014, 01:25 AM #5
My idea was to know if for example can have 12 for any RPM am I going to be lean at idle
07-24-2014, 02:53 AM #6
- Join Date
- May 2013
At 12 it can be a bit rich and cause start problems.
If you're going for 'safe' then ironically, safe is sometimes more lean or more rich depending on many factors (fuel quality, load on engine etc).
To be 'safe' and predictable and maximise safe performance, CMD is the only way. Give it your perfect AFR's, we can help ypu with these, sit back and let CMD take care of everything. Add new mods? Not a problem, CMD will fix the fuelling itself. Go out on a cold crisp morning or a baking hot humid day and CMD will adjust fuelling to always hit your targets.
It's like having a race tech living in your engine bay!!
07-24-2014, 06:05 AM #7
07-24-2014, 10:06 AM #8
I do have CMD. My question i theoretical. I wanted to know if you have to represent lean/reach condition is there a magic number which is used as base / for example perfect AFR is XX.X but on idle you need it a little lean and so on/
07-24-2014, 11:20 AM #9
- Join Date
- Jun 2013
12.0 to 1 wide open throttle
14.5 to 1 everywhere else
07-24-2014, 11:30 AM #10
Is it rich at wot, lean everywhere else or both.
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