boost problem

[DSMeclipse4G63]

ok the mods in my profile are up to date. but fopr a quick run dopwn exhast, intake, and fuel mods done, as well as some porting or my intake mani.
The question is everytime I nail the gas I hit 15-17 psi on the ol' t25. I took my mbc off and the same stuff keeps happening. Could a messed up cat be the problem? Also where is the cheapest place to get a decent downstream O2 sensor cause mine is done?
thanks Andrew

 

[theTuner]

by "fuel mods done" what do you mean, you wont be boosting more then 15-17 psi without more fuel then stock, btw htting fuel cut means your probably too lean i would lower your boost for now.

 

[DSMeclipse4G63]

I have fpr now and pump is on the way....I cant control boost it does what it wants. I havent hit fuel cut so far(crosses fingers) but I was a week ago. From my mods I shouldnt be hiting 15-17psi.

 

[yhype]

there is a slight possibility that your wastergate or actuator could be ####ed up. so you might want to check that out

 

[DSMeclipse4G63]

how would I ceck for a wastegate problem??? I come from the wonderful world of displacement, so take it easy on me. thanks

 

[leet]

get an air compressor set it for like 15psi (low you dont want to kill it)
hook it up to the wastegate, and pressurize it to see whether it is functioning or not.

 

[GSntncT]

Originally posted by yhype
there is a slight possibility that your wastergate or actuator could be ####ed up. so you might want to check that out

It's possible. But first, have you checked the hoses on your MBC yet? Because if it has even the slightest tear in it, that will happen. Taking off the MBC will give you the same result, that is unless you completely reconnect your BCS.

 

[focusedrage]

Also there have been some debates of how to propperly hook up a mbc. I run the xbc in a loop from the outlet nipple on the compressor side right to the wastegate.