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Stage 2 MPI Supercharger upgrade

onrof

Extreme
Joined
Jan 19, 2005
Messages
85
Location
MI
Website
www.geocities.com
Finally got the new pulleys for my stage 2 apex kit. It consists of 2 pulleys and a new composite supercharger belt. This is supposed to make 14lbs now.

MPI says max on the stage 2 is 17lbs and requires 2 different pulleys the new belt and a new auxilliary fuel pump.

I've been stuck at 10lbs all season which was great for trail riding 3500 of the most responsive and dependable miles ever, this season but it will be nice to have the option of finally turning up the boost! (Unfortunately still not as easy as flipping a switch)!!
 

Are you going to run that on the trail with pump fuel? If so, what is your exspected HP and torque with that stage II? I'm wondering what a stage III would be like on the trail, but I think that is for strickly racing.

Vince
 
I ran 3500 trail miles at 10lbs on pump fuel/race 50/50 this past winter without any problems. Had the O2 sensor dialed in pretty well. Anything more would require even more octane probably all 110 octane. I'll probably just save the pulleys for festival weekends hanging on the lake. Still got to trail ride next year. Thinking hard and getting feedback about a turbo for the RTX...
 
onrof said:
I ran 3500 trail miles at 10lbs on pump fuel/race 50/50 this past winter without any problems. Had the O2 sensor dialed in pretty well. Anything more would require even more octane probably all 110 octane. I'll probably just save the pulleys for festival weekends hanging on the lake. Still got to trail ride next year. Thinking hard and getting feedback about a turbo for the RTX...

You better put a Speed track in it this year. I want to see the baby fly out of the hole.

Al though I did like beating you to the cones on Lake Mitchell with my stock Attack with just clutching and a speed track. even if you passed me at the cones like I was dragging another sled behind me. LOL
 


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