jjjimene

Just wondering what is everyones AFR during cruise because i think i am not getting the best MPG on my car, I am currently running 16.1 AFR and the best I got is 24MPG

Also during partial throttle i see around 14.0 to 15 AFR, do you guy think i can lean it out to like 15.5- 16 during part throttle and 17.0 AFR during cruise????

I am also boosted by the way

thanks in advance

s2000Junky

Nope I think your about as lean as you want to go to be safe and functional, your already leaner then oem at cruise. 24mph is actually pretty good. Practice better throttle control is about the only option left.

jh4db536

I used to think just leaner during cruise meant better mpg.

There are multiple factors that determine mileage (gonna list a few that are overlooked):

Setting up and refining your wideband feedback is important. When feedback is active and sensitivity. Defining cruise (in ms of stable load). Telling it to reset after an accel event, dfco event, 0 tps event...etc

Perfecting decel fuel cut parameters so that it cuts the injectors off exactly when it needs to when you let off the gas, almost anticipating.

Not setting up accel events are detrimental to mpg IMO cruise afr equal. I tried to analyze this theory, but I can repeat it everytime if I disable it I get about 20mpg with 14.7afr fuel table. I get a little higher like 23 street with it enabled and configured properly all else equal. The lack of accel will cause lean conditions that the wideband will react to by dumping way more fuel than accel event would. Also without accel events, the engine will lose power so driver will reflexively mash the throttle harder to get the car moving.

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wadzii

you can pretty much lean it out till you feel it loose power and the add a little back. On my car that was around 15.5:1 at steady cruise.

If you have a good turbo setup you should be able to get 30+mpg on the highway if you stay out of the throttle. Are you on aem or hondata?

dstevens

Much depends on driving conditions and style. You really need an instant feedback economy gauge to learn what uses fuel and what doesn't, but on my AP2 I would get around 27 mpg on the freeway. The S2000 really needs taller gearing and variable cam timing to get much better economy.

I quantified the AFR some time ago (for the RSX, but should still apply). Too lean gives worse fuel economy, and the EGTs are probably fairly high on the freeway.



Full article is here: http://www.hondatuningmagazine.com/t...conomy_tuning/

The best thing you can do is part throttle fuel tuning.

s2000Junky

Good read