ok i just went flat to the floor and the bloost went to 17.5+ i'll show below

-70 0 70
I I I I I I I I I
^17.5

well that didnt work

Do you have a section at the top of travel on your boost gage marked yellow and/or red? What reading does the yellow start at? How far away from yellow are you getting at wide open throttle (WOT)?

17.5? Hmm, a boost gauge should be -10 to +10. That should put you about +7.5 and that'* about right for a stock engine.

ok i just went WOT and the boost gauge only went to +17.5 which is just abit to the right of the 0

never mind the last post i put. so why is my blazer faster the my SSEI and the SSEI runs GREAT except for the bucking at low RPM

Holy smokes. Mark this day on your calendar as the first (and probably the last) time 2KG4U knew something Danthurs didn't. I didn't question his readings because I know what they are. Canadian car, metric readings. Same as mine.

Do you have the yellow and red sections? What reading does the yellow start at?

Well, you got me there.

17.5 pascals is 0 psi, which is normal atmospheric pressure. You aren't getting any boost off your supercharger. That'* why your car is so slow. Read these:

https://www.gmforum.com/t284309/#post1392207
https://www.gmforum.com/t280121/
https://www.gmforum.com/t284310/#post1392208

Shouldn't be too hard to fix. We can walk you through it.