Ok so i had installed some aftermarket IC piping and threw together the hotside and o2 housing. For weeks the car peaked @ 23psi then held @22psi. EVEN AFTER TIGHTENING all hose clamps and vacuum lines my boost is peaking to 21psi then tapering like it did under the stock ROM to 17-18psi. Did this happen to anyone else out of the blue? Like i said all UICP and LICP hoses and clamps and line are as tight as they can be. I am in the process of making the boost leak tester that is shown on the forum but in the meantime does anyone have any pointers what may cause this? Thanks

 

until you get a boost leak test it is hard to say

 

bump for any help or ideas

 

i would do a leak text first, and i never liked those ebay housing. i think stock is good. i doubt thats the problem tho.

but you changed your hot side also?

 

Had the stock hotside ported and its not an ebay housing its a titek, good stuff

 

i would do boost leak and then come back.

 

+1 for leak down test. what does your boost gauge read? what's the vacuum etc etc

 

I bet you never held 22 psi after peaking at 23. I can bet money on that if you have an MBC.
So, just up the boost so you hit 23 again. And a boost leak is a good idea on a regular basis.

 

Im having the same kinda problem

 

You bet wrong. I sure did. Peak to 23 then held 22psi ALWAYS. I would never give false info(for what reason??!) and DO NOT have a MBC it was all done through the flash. Boost leak is gona be a done deal as soon as i make the tester.

 

If the leak test comes up negative, then install an MBC and turn your boost back up to 23#.

 

Actually you read wrong.


Anyways, maybe you should have said something about your boost control method when you asked for help with boost problems. Just a thought.

If you have changed boost pills and stock solenoid and tuned with load tables, you needed a retune after you installed things that changed the airflow.
But again, as everyone said, i don't see the point discussing potential problems until you do the leak test.

 

Just assumed if i didnt list a MBC on my mod list you would have known it was through the flash. Anyways, making the leak tester today and im guessing il find a leak b/c this happened out of the blue one day. No pills were changed and the mods were added months before this happened. And the leak test would be a given; i was trying to find someone who had basically the same problem...not losing ALL boost such as an ICP hose blowing off, but rather it dropping a few psi's from what it was.

 

Are you just slapping the new parts on your car without a tune?
once you install new parts, You have to get your car retunned. changing O2 requires retune for the boost unless you have a MBC. your WGDC is probably off the chart.

 

I hear ya, but that wouldnt make sense then b/c even though i have a basic flash, for months after i installed the o2 the boost was exactly the same