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#Strange boost/vac gauge readings?

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Mikerthebiker
 Post subject: Strange boost/vac gauge readings?
PostPosted: Fri Jul 23, 2010 1:28 am 
In Neutral
Joined: Tue Dec 22, 2009 7:11 am
Posts: 34
Location: calgary alberta canada
so i just installed a VDO boost/vac gauge in my car and seem to be getting strange readings, boost seems to be working normal. but at idle the needle sits calm at zero, if im reving or cruising under around 2000 rpm the gauge goes down to about 10in/hg. and once the turbo kicks in the gauge reads about 6psi. all in all the car idles/drives fine... :?

ive searched around and cant seem to find anyone with similar problems, anyone able to give me an idea of where to even start looking?
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kimokalihi
 Post subject: Re: Strange boost/vac gauge readings?
PostPosted: Fri Jul 23, 2010 1:51 am 
Fifth Gear
Joined: Mon Nov 06, 2006 3:41 am
Posts: 7610
Location: Tenino, WA
On my car the boost gauge reads around 18in/hg on idle I believe and probably around 0 on cruise and hits boost around 3-3.5K under decent load. I don't know if that's normal or not though lol.

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cj91legss
 Post subject: Re: Strange boost/vac gauge readings?
PostPosted: Fri Jul 23, 2010 2:27 pm 
Fifth Gear
Joined: Fri Jun 20, 2008 8:17 am
Posts: 3760
Location: Lakewood, Wa 98439
Mikerthebiker wrote:
so i just installed a VDO boost/vac gauge in my car and seem to be getting strange readings, boost seems to be working normal. but at idle the needle sits calm at zero, if im reving or cruising under around 2000 rpm the gauge goes down to about 10in/hg. and once the turbo kicks in the gauge reads about 6psi. all in all the car idles/drives fine... :?

ive searched around and cant seem to find anyone with similar problems, anyone able to give me an idea of where to even start looking?


gotta be a bad boost gauge

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macipusy
 Post subject: Re: Strange boost/vac gauge readings?
PostPosted: Fri Jul 23, 2010 4:16 pm 
Second Gear
Joined: Wed Aug 22, 2007 9:27 pm
Posts: 506
Location: Denver, CO
There might be a leak near or in the boost gauge line...double your fittings and lines.

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maciek puszynski

91 Legacy Turbo | SS | 5mt
98 Legacy 2.5 | wagon | 5mt


2.35L Turbo Legacy Build

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Legacy777
 Post subject: Re: Strange boost/vac gauge readings?
PostPosted: Fri Jul 23, 2010 7:50 pm 
Site Admin
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Joined: Tue Oct 15, 2002 11:37 am
Posts: 22893
Location: Houston, Tx
Double check all the fittings, but I'd also suspect a bad gauge.

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surrealmirage.com/subaru
1990 Legacy (AWD, 5MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm

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Sphinxmunkey
 Post subject: Re: Strange boost/vac gauge readings?
PostPosted: Mon Jul 26, 2010 9:47 pm 
In Neutral
Joined: Mon Jul 19, 2010 3:57 am
Posts: 2
Try swapping it to a different vacuum line for the reading.
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Mikerthebiker
 Post subject: Re: Strange boost/vac gauge readings?
PostPosted: Tue Jul 27, 2010 1:51 am 
In Neutral
Joined: Tue Dec 22, 2009 7:11 am
Posts: 34
Location: calgary alberta canada
so just doubled the lines and found a crack, replaced a few of the hoses and moved the gaugee line to just off 1st cyl intake manifold, and am now reading 20in HG

thanks for the help guys! :-)
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