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Stage 1 Supercharged Nytro Pulley Testing complete@Sea Level

full tilt viper

full tilt viper

Pro
Joined
Dec 25, 2009
Messages
140
Age
56
Location
Ontario
Country
Canada
Snowmobile
Nytro MPI Stage 1
Nytro XTX, stock compression and fuel system. Ran 3 pulley combo's @8900-9000. 29bx28t made a solid 8+ with boost fuel and main fuel maxed AFR got high quick 13.2-13.7.Next 28tx28b made a solid 7.2-7.5 afr a bit better at 12.8-13.2., still too high. Last 27bx28t makes 5.8-7 with afr 12.3-12.6 which I think is manageable and probably the way to go. How much does RPM affect boost levels because I was hoping to run the 28tx28b and what do you guys think of 12.3-12.6 afr's ?
 

My usual settings for 27bx28t are 3,4,6.5,5.5,2.5,8. I maxed out red and b/g and it didn't seem to do much
 
Seems like you're maxing out the injectors. Generally with supercharges the pressure will hit a peak but volume will increase with rpm. I generally start out at 12.8:1 and add fuel until torque starts to drop off.


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