Looking for info on a mpi supercharger

[Yamaharider74]

Hello my super charger pulleys are 27 bottom 22 top how many pounds of boost is it putting out guy told me it was a stage 3 bit another guy who worked on sled said it was a stage 1 he said it was putting out about 7 to 8 pounds of boost does that sound right I have never had running am rebuilding motor right now

 

[kuvasz]

Hello my super charger pulleys are 27 bottom 22 top how many pounds of boost is it putting out guy told me it was a stage 3 bit another guy who worked on sled said it was a stage 1 he said it was putting out about 7 to 8 pounds of boost does that sound right I have never had running am rebuilding motor right now

should be 10-11.8 depending on your elevation. just watch your not over reviving the supercharger. it would be best to have a temp gauge on the supercharger. i wouldn't run anything more than 26 bottom and 22 top.
this may sound stupid but you are running an a/f gauge right? the reason i asked was i couldn't run the 26/22 pulley combo until i upgraded my fuel system. the machine would run fine for the first 400ft then it would show 12.5 and lean out. if i didn't get off the throttle, i'd have a new boat anchor.

 

[Yamaharider74]

Yep

should be 10-11.8 depending on your elevation. just watch your not over reviving the supercharger. it would be best to have a temp gauge on the supercharger. i wouldn't run anything more than 26 bottom and 22 top.
this may sound stupid but you are running an a/f gauge right? the reason i asked was i couldn't run the 26/22 pulley combo until i upgraded my fuel system. the machine would run fine for the first 400ft then it would show 12.5 and lean out. if i didn't get off the throttle, i'd have a new boat anchor.

it has an a/f gauge on it but when I took sled apart I seen the probe was buggered so will have to order new one of those , thanks for the info I am from the flat lands of saskatchewan the sled is set up for flat lands I will likely never go to mountains , I will post results once I get engine back together and running

 

[Yamaharider74]

How

should be 10-11.8 depending on your elevation. just watch your not over reviving the supercharger. it would be best to have a temp gauge on the supercharger. i wouldn't run anything more than 26 bottom and 22 top.
this may sound stupid but you are running an a/f gauge right? the reason i asked was i couldn't run the 26/22 pulley combo until i upgraded my fuel system. the machine would run fine for the first 400ft then it would show 12.5 and lean out. if i didn't get off the throttle, i'd have a new boat anchor.

How can you tell the difference with the stage 1 to a stage 2 or a stage 3 is it just pulley change up or are the superchargers different ?

 

[kuvasz]

How

How can you tell the difference with the stage 1 to a stage 2 or a stage 3 is it just pulley change up or are the superchargers different ?

different blowers and mounting brackets.