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Nytro mpi 180/190 gems tuner issue's

yamashaker

Veteran
Joined
Nov 12, 2010
Messages
48
Age
65
Location
Candle Lake, SK.
Country
Canada
Snowmobile
2007 Attak GT / 2017 Sidewinder LTX
I have a XTX 2011 with 180/190 GEMS tuner. It has only 4 fuel settings @ green 4.0, yellow 4.0, red 3.0 and green/blue 3.5. Starting the engine and gems goes through it's routine, AFR, reads 15.0 for a few seconds then slowly drops to 10.3 until warm light goes out, then to 11.3-12.0. At slow take off speed to move sled and slow cruising speed, AFR will read 11.3-10.3. Any further advance of the throttle AFR will read 10.0 and will stay there even at higher cruising speeds and will only go 11.5 -11.9 on full throttle. AFR reads 10.0-10 3 on average trail riding, this is way too rich in my opinion. I believe the fuel injectors need to be adjusted on sled factory ECM to richer which is opposite of the gems reading. Would a setting of 12.0-12.5 be plenty safe for this tuner? This sled has the MPI push turbo with dual boost switch for 7/10 lb boost option.
 

jgustman

Pro
Joined
Feb 25, 2005
Messages
184
Age
47
Location
Cottonwood, MN
Country
USA
Snowmobile
'10 Nytro RTX
LOCATION
Cottonwood, MN
Yes you are way rich. I run a Yamaha/Mpi 180 Supercharger with fuel setting at: Green 1.5 or 2, Yellow 3.5, Red 3.5, Green/blue 3.5. It‘s much closer to 12.5-13.5 in lighter throttle setting and 12 or a bit richer in heavy throttle, which is safer. You want no more than 12 at full throttle. Decrease your green setting to 3 and you should see it lean out, play with the green mostly.
 


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