[boomz55]

I have a 09 rzr 800 na with looney tuned duals and a dragonfire intake. I just got my PCV and autotune in and need to know what AFR I need to run at. Anyone help me out???

 

[WOLF1]

I ended up targeting 13.4 in the cruise positions and 12.8 above 80% throttle.

 

[roach57]

i run about 13.25 across the board right now, i should go in and get a little picky. would be nice to have a tuning center with a dyno near by.

 

[boomz55]

Awesome thanks guys. I think I am running pretty fat. Wanted to make sure to be safe.. Where would you be worried about getting too lean In a/f

 

[roach57]

17.1 is as lean as I would want to ever run, not sure what the damaging point would be though. but a lot of people have a cruising throttle ratio of around 14.7

Bristol Dyno technical article - air / fuel ratio
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[wakethis2006]

I've already stayed on my turbo at 11.8 to 12.8 through all ranges. I've heard from a lot of people that 14 and higher is way to Lein and could pop at any time. Just my 2 cents tho.

 

[boomz55]

Thanks for the reading Roach!! Good info in that article. And to everyone else chipping in opinions. I guess I will have to do some trials. I do not have access to a dyno which is the reason for asking you all that might have had a chance to put your rzr on one and get actual numbers. Just wanna be as close as I can be to dialed in without having a dyno. Closest is prob 3 hrs away.

 

[426m]

17:1 ? better go ahead and buy a new piston, your gonna need it.

 

[boomz55]

Hey Wolf did u ever have your rzr on a dyno or did you just have the best feeling out of your rzr at those target a/f tables?

 

[roach57]

17:1 ? better go ahead and buy a new piston, your gonna need it.

oh i definetly don'r recomend it, he just asked at what point to start worrying.
there is an approximate 15% reduction in gas used at this ratio and a lean 17:1 mixture normally has too slow a fuel burn-time which may cause knocking and misfiring. Many automobiles will use this as a custom ratio at the standard light-load cruise and use some ignition advance.