MPI Supercharger stage 1 or 2

wkeggenhoff

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Location
Ajax,Onatrio, Canada
Country
Canada
Snowmobile
2006 Yamaha Apex RTX
Was told by my dealer that the fuel injector does not supply enough fuel for this mod and will cook engine. What do they do to moodify fuel system ? do they ran an extra fuel injector. Something about stock injector already at 85 % of operating capacity, and not good to run it any higher
 
stage 1 supercharger @ 7-8 psi is max for your fuel injectors at your elevation
 
I run a stage 1 at 10-11 psi and ran out of fuel, added a $80 hi flo full pump and have more then enough fuel now, still trying to lean it back out.

My engine is shimmed for 10:1 compression. This is for a apex.
 
I just noticed this is a Apex sorry. Apex has much larger injectors then the Nytro which i labeled
 
APEX HEAD SHIM

DID YOU SHIM THE MOTOR YOURSELF OR DID THE DEALER DO IT. WHAT DO THEY CHARGE FOR THIS SERVICE ? I KNOW ALLEN ULMER SUPPLIES A SUPPLIMENTARY FUEL PUMP i BELIEVE FOR STAGE 2, DONT KNOW IF IT IS USED ON STAGE 1 OR NOT.
 
With a larger fuel pump, the injectors are maxed at 14lbs. They will run comfortably at 10-11lbs with the larger pump. I wouldn't use the stock pump over 7lbs.
 


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