Mario.

So after an exhausting 20 hours or so of work... test driving today, she runs great. Blew a charge pipe off, but got it all assembled and did it again. Purs like a kitten below 5500rpms (my personal max before I dyno tune it) but only gets up to 4.5psi or so. The wastegate has a 7psi spring, no MBC or anything. I am using a combination of hose clamps and T-bolt clamps... but any recommendations or procedures to check this would be great.

18G_prelude

where is your vacuum source for your wastegate?

Mario.

Right off the cold side on the turbo.

MrBui

is it only 4 psi at 5.5k? what size turbo?

beepy

Try taking it from the manifold. You are only seeing 4 PSI because you are dropping several PSI through your intercooler and charge pipes, which is normal.

Mario.

Yep, it starts building boost at 3,000rpm and makes 4.5psi at 4,000rpm.

Move it to the manifold?? Hmm, that's a good idea. I will try that tomorrow. Any other suggestions or backups appreciated.

18G_prelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beepy &raquo;</TD></TR><TR><TD CLASS="quote">Try taking it from the manifold. You are only seeing 4 PSI because you are dropping several PSI through your intercooler and charge pipes, which is normal.</TD></TR></TABLE> Thats what i was thinkin

Mario.

Ok. Does make sense.

BTW, turbo is a 50 trim .42/.48 T3 on a b16a motor.

Mario.

Also -- I could barely hear the BOV. I don't know if this was because it was only 4psi or what... but it didn't flutter or anything like my last setup. Perhaps this information can verify something.

18G_prelude

what bov? can you adjust it?

Mario.

Damn I really suck with giving information tonight.

It's a 1g DSM BOV.

My neighbors WRX with recirculating BOV is louder than mine.

beepy

The 1g BOV is supposed to be recirculating, but... If you leave it open atmosphere you should be able to hear it when barely any boost builds up. No flutter, it just sounds like a rush of air.

Mario.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beepy &raquo;</TD></TR><TR><TD CLASS="quote">The 1g BOV is supposed to be recirculating, but... If you leave it open atmosphere you should be able to hear it when barely any boost builds up. No flutter, it just sounds like a rush of air. </TD></TR></TABLE>

There is a rush of air... it's just not as loud as my Prelude was.

Would a boost leak in the charge pipes cause this???

Bailhatch

The blow off valve could just be leaking too. try capping it off or clamping a piece of flat plastic or something betwen the valve and charge pipe so it doesnt leak.

Mario.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bailhatch &raquo;</TD></TR><TR><TD CLASS="quote">The blow off valve could just be leaking too. try capping it off or clamping a piece of flat plastic or something betwen the valve and charge pipe so it doesnt leak.</TD></TR></TABLE>

Used black silicon on it... but I will check tomorrow.

Can I connect my air compressor to the vacuum nipple on the BOV and check or....?

Bailhatch

no i dont mean that its leaking between the flange and the valve. I mean that its not closing all the way or not seating correctly. Just plug it up and go drive to make sure.

Mario.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bailhatch &raquo;</TD></TR><TR><TD CLASS="quote">no i dont mean that its leaking between the flange and the valve. I mean that its not closing all the way or not seating correctly. Just plug it up and go drive to make sure.</TD></TR></TABLE>

Ok I'm not following you. You said clamp it between the charge pipe and the valve... woulsn't that be the flange there? What am I clamping then again?

Sorry, it's been a REALLY REALLY long past two days and I am way out of it.

Mario.

Mario.

Ok I tried a different source, didn't work.

Ideas?????????????????

Mario.

Come on guys!!

I removed the vacuum source completely, and it finally goes past 5... sorta around 7 and then goes higher.

I really need some ideas.

MrBui

what kind of turbo are you running?

Boost Addict

It sounds like a boost leak to me. Start it up near the engine bay and give it some throttle, then see if you can feel air coming from anywhere. It's prob just a loost hose clamp or something

Mario.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MrBui &raquo;</TD></TR><TR><TD CLASS="quote">what kind of turbo are you running?</TD></TR></TABLE>

Think I already posted it, but it's a 50 trim .42/.48 T3.

BoostAddict -- I did that... I just blew a pipe running with no wastegate vacuum, and got it reconnected and tightened. The best I can get is 5psi.

MrBui

is the turbo new? any shaft play? could your gauge be wrong?

YiNYaNg

^ if your blowing off charge pipes at 5psi your piping clamps must have crappy clamping force.