i have a 96 gsx and i normaly run 22psi. my altanator went and i replaced it like a week ago after i replaced it the boost only went up to 18 psi and over the week it slowly has gone down and today the boost only went up to 13 psi . i have not touched the mbc at all i just wanna know what the **** is happening to all my boost?

 

what kinda turbo, stock? Because if it is then 22 psi was way too high. You must have messed something up when you replaced the alternator. Check around for any leaks i guess. Other than that i dont know that else you could have messed up

 

boost leak, make a boost leak checker(pvc cap and a tap an air fitting into the center of it) pump a compressor up, and listen for the PPPPSSSHHHTTTT. Also I hope you have a fuel system.

 

this is what i have done to my car performance
removed balance shifts
crank was balanced and blueprinted
stage 2 comp cams
Evo 3 turbo/ Ported polished w/34 mm flapper
650cc injectors
turbo timer
3" exhaust
short shifter
stage 2 cluchmasters cluch
greddt type rs blowoff valve
custom turbo piping
manual boost controller
apex air fuel computer mixer
and i think i have 190 fuel pump


now how do i make a boost leak checker and where do i get the supplies for it and where do i hookit up to?
now my car is down to 11 psi

 

check what size you intake piping is, take that mesurment to home depo, get a pice of pvc thats got that diameter as the O.D. and get a cap for one end(may also want to get some pvc glue).... btw you may want to make sure that you have an air compressor with a external tank so you can pump that up to a cartian psi. Anyway find out what size of npt thread is on the end of your compressor hose. Chances are its either 3/8 or 1/4, anyway get a brass fitting 1/4 or 3/8npt on one side and the other can be what ever size npt you want. Then tap the top of your pvc cap, thread the brass fitting into the hole(you may want to use some sort of adheasive on the threads to keep it from leaking like a 3m cauk or soemthing) then glue the pvc cap on the piece of pvc. Then attach the other end of the pvc to your intake, attach your compressor to the fitting in the top of the cap and pump her up to 30 psi. After the pump has reached that amount listen for a leak. Then fix it and get back on the road.

 

On my evo i had the same problem and i found one of my couplers had a small hole and after a couple of days it turned into a slit and i couldn't boost at all. Just check all your couplers. Hope this helps