ok, so this weekend i helped my buddy boost his car. We get everything done, tune it a little and go for a drive, tune some more, go into boost and it only goes up to 2 or 3 psi, and drops...it doesnt hold boost. So we figure there might be leaks from the welds on the charge pipes..but none, so we take the IC off and fab up some pipe to see if the IC is leaking....not the problem... all the couplers are tight as hell, and no vaccume leaks, vacuume is 20 at idle, anyone go any ideas? we are clueless

 

What size spring do you have in your wastegate and where are you getting your wg vac. source from? Could you have forgot to put in the wastegate firing ring (I think that's what it's called - the ring that sits between the WG and flange) or is it in backwards?

Good luck

 

its an internal wastegate and the vac source comes from the compressor. We put on a MBC and closed it all the and still went to 2psi and didnt hold

 

anyone?

 

sounds like u might have a boost leak sometimes u cant hear them or even feel or see them just do a boost leak test here is a link to build on they run less than 10$ at ace and im sure u will find at lease one leak

http://www.vfaq.com/mods/ICtester.html use a bottle of water and sope to find it good luck man...

 

damn thats a good idea, thanks

 

yeah its an old dsm trick let me know what u find out and if the test help...

 

R you sure its a boost leak and not an exhaust leak b4 the turbo..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1QwIkEf &raquo;</TD></TR><TR><TD CLASS="quote">R you sure its a boost leak and not an exhaust leak b4 the turbo..</TD></TR></TABLE>positive! the adapter is brazed to the mani, no leaks there. and there is a gasket before the turbo. no black soot from exhaust or anything. plus i can hear the turbo spool like hell, and if im in a higher gear going slow and punch it, i get about 4-5psi then it falls off as i gain speed.

 

check the waste gate and bov to make sure they are not stuck open.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 1QwIkEf &raquo;</TD></TR><TR><TD CLASS="quote">check the waste gate and bov to make sure they are not stuck open.</TD></TR></TABLE>i used an MBC to block off vacuum/boost completely to the WG, so that cant be it. and im using a DSM bov, so its open at idle, but when i give ti gas, i can see it close

 

did u do a boost leak test? the dsm leaks a bit at idel but does close up after u get if gas.. and there should be a line going to the wasgate even if u have a boost controler and it sounds like a leak to me man maybe maybe maybe a clogged cat.. it holds boost back makes sence a bit but id try the test first let me know how it goes