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AFR ideal range

DMCTurbo

VIP Member
Joined
Nov 12, 2005
Messages
2,759
Age
51
Location
Val Caron, Ontario
Country
Canada
Snowmobile
2017 Sidewinder XTX LE 137
where do you want your AFR to be and at what value does it become too lean?
 

Idle it can be in the 12s to low 13s even driving on the trail you could see it in the mid to high 12s with little to no boost. The motor has like 9.5:1 compression. The concern is at WOT, that's when you want to see it at high 11s low 12s. I have 2 superchargers and 2 boosted sleds... so I have been around the block a few times.

If you keep the numbers in the high 10s and 11s cruising with little to no load or boost you will waste fuel.
 
Idle it can be in the 12s to low 13s even driving on the trail you could see it in the mid to high 12s with little to no boost. The motor has like 9.5:1 compression. The concern is at WOT, that's when you want to see it at high 11s low 12s. I have 2 superchargers and 2 boosted sleds... so I have been around the block a few times.

If you keep the numbers in the high 10s and 11s cruising with little to no load or boost you will waste fuel.

This is dead nuts accurate
 
Im wondering what the winder is stock afrs and with a free flowing can afrs...12.5 for a few seconds in the midrange while wot is too lean?
 
Im wondering what the winder is stock afrs and with a free flowing can afrs...12.5 for a few seconds in the midrange while wot is too lean?

Few seconds... not at the compression of the SW. Zero load lower boost no way. If u were seeing mayb 13, I would be more concerned.
 
Thats what i was thinking also, my rzr 1000 turbo from osp sees a wide gamit from start up 10 to 13.4 afr no load cruising the trails.
 
Im puting my osp pipe on my winder mon , Don't have no afr gage as of yet good or bad idea guys
 
Im puting my osp pipe on my winder mon , Don't have no afr gage as of yet good or bad idea guys
I would not do ANY long hard pulls. Most of the aftermarket mufflers are running LEAN. What does OSP say?
 
Same as you say,But will corner to corner riding be ok?
 
If it were me I would Call OSP and check with them..
Or it sounds like you want ride without calling or a tune.. I will say its VERY hard to not squeeze the flipper to the bar on these things,.. You do it once its like super addictive .. that's going to be the issue, why chance it? We got a whole riding season ahead of us!!
:sled1:
 


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