05-09-2010
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#1
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Join Date: Jun 2009
Location: Plymouth
Drives: 03 TB EVO
Posts: 164
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Low Vac at idle
99 Eclipse Turbo FWD
- walbro 255
- 14b turbo
- 3" turboback
- pacesetter header
- vr speed FMIC
- Greddy RS BOV
Hey guys i just got my motor back in my car finally, and am trying to figure out some minor issues. When the car sits at idle or at cruise, the boost gauge reads that its at 10vac, i dont have trouble boosting or anything, so i wouldnt think its a boost leak, but im not sure yet, because im still breaking in the brand new clutch and turbo, so i don't want to over spool on the turbo. I'm going to Boost leak test it 2mrro. Just wondering if anybody had any ideas of something it could be off the top of their head?
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05-09-2010
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#2
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AznKraut
Join Date: Feb 2006
Location: Stillwater
Drives: '03 325i, '98 Ranger '03 Duramax
Posts: 1,374
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Re: Low Vac at idle
My car pulls about ~12 in/hg (Give or take 1 or 2 in/hg) at ~700-800rpms when it's at operating temperature, and anywhere from 16-20+ in/hg at cruising speeds. I think about 70mph in 5th gear I pull close to 18 in/hg. I do have 272 cams though, I'm not sure if how much of a difference 272's make when it comes to pulling vac at idle when compared to stock cams, but if you're at cruising speeds on the highway you should definitely be pulling more than 10 in/hg.
Does it stumble or sound rough when it's at idle?
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A//// Guy: putting a dsm on a website as your fleet vehicle is like asking people to shop elsewhere
Last edited by LingLing; 05-09-2010 at 11:42 PM..
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05-09-2010
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#3
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Join Date: Jun 2009
Location: Plymouth
Drives: 03 TB EVO
Posts: 164
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Re: Low Vac at idle
no, thats the funny thing, it idles fine. I'm starting to wonder if the line is kinked or the gauge is fd. I guess when I leak test it in the morning I'll check that out too.
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05-09-2010
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#4
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AznKraut
Join Date: Feb 2006
Location: Stillwater
Drives: '03 325i, '98 Ranger '03 Duramax
Posts: 1,374
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Re: Low Vac at idle
Quote:
Originally Posted by adidasdudegst
no, thats the funny thing, it idles fine. I'm starting to wonder if the line is kinked or the gauge is fd. I guess when I leak test it in the morning I'll check that out too.
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FYI: I edited my post a minute ago, and not sure if you saw it before you responded.
__________________
A//// Guy: putting a dsm on a website as your fleet vehicle is like asking people to shop elsewhere
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05-09-2010
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#5
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15min late to the world
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Re: Low Vac at idle
What was the gauge reading before? The lower the engine idles the less vacuum it will pull. The only leaks you would have would be in the intake manifold to see a vacuum drop at idle.
~John
__________________
Moon taxi: 9.45@156.9 mph 41psi 2011... Letting people down sense 2012.
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05-09-2010
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#6
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Join Date: Jun 2009
Location: Plymouth
Drives: 03 TB EVO
Posts: 164
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Re: Low Vac at idle
I was getting about 18-21 in vac at idle before @ about 750rpm. And while the motor was out, I didnt do anything with the intake manifold at all, so it must be the gauge or the line is kinked somewhere.
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05-10-2010
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#7
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Join Date: Nov 2005
Location: Cottage Grove
Drives: Silver '02 IS300, Blue '06 Suzuki SV1000
Posts: 5,293
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Re: Low Vac at idle
You probably have a vacuum leak somewhere.
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'02 Lexus IS300
'06 Suzuki SV1000: Back on the road and ripping hard as ever!
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05-10-2010
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#8
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immune from paybans
Join Date: Oct 2005
Location: West Des Moines
Drives: poorly
Posts: 4,358
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Re: Low Vac at idle
Big cams will also pull less vacuum at idle. What cams are you running? If they're stock then 10 is way too little.
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05-10-2010
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#9
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Walls need hugs too
Join Date: Aug 2008
Location: Plymouth
Drives: V10 Touareg, Beater Jetta, Evo IX
Posts: 3,876
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Re: Low Vac at idle
Yeah, DSMs should idle between 22 and 15 depending on the idle speed.
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Quote:
Originally Posted by Murlo26
Spaz badger don't give a shit.
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Quote:
Originally Posted by Trogdor
Smart chicks are better. Personally I like a girl to give me her thesis on how to solve the economic crisis while I put it in her ass.
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05-10-2010
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#10
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Admin
Join Date: Oct 2003
Location: Sportsman's Paradise, LA.
Posts: 5,382
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Re: Low Vac at idle
If your cams are stock, check the cam timing.
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"You don't have a clue. You couldn't get a clue during the clue mating season in a field full of horny clues if you smeared your body with clue musk and did the clue mating dance."
When she get's bitchy, SPANK THAT ASS! (#Y#)
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05-17-2010
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#11
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Join Date: Jun 2009
Location: Plymouth
Drives: 03 TB EVO
Posts: 164
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Re: Low Vac at idle
havent thoroughly checked cam timing yet, but the marks line up dead on. Also, dsmlink reads 20-25 at idle, where the boost gauge reads 11 in vac. Is dsmlinks boost source reliable? I cant remember where it gets the data from
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05-17-2010
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#12
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Admin
Join Date: Oct 2003
Location: Sportsman's Paradise, LA.
Posts: 5,382
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Re: Low Vac at idle
2g's have a map sensor on top of the intake manifold.
__________________
"You don't have a clue. You couldn't get a clue during the clue mating season in a field full of horny clues if you smeared your body with clue musk and did the clue mating dance."
When she get's bitchy, SPANK THAT ASS! (#Y#)
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05-18-2010
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#13
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Join Date: Jun 2009
Location: Plymouth
Drives: 03 TB EVO
Posts: 164
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Re: Low Vac at idle
So is the MAP sensor (dsmlinks vacuum/boost readout) just as reliable of a source for boost and vac as the boost gauge?
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05-18-2010
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#14
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Admin
Join Date: Oct 2003
Location: Sportsman's Paradise, LA.
Posts: 5,382
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Re: Low Vac at idle
Quote:
Originally Posted by adidasdudegst
So is the MAP sensor (dsmlinks vacuum/boost readout) just as reliable of a source for boost and vac as the boost gauge?
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No
__________________
"You don't have a clue. You couldn't get a clue during the clue mating season in a field full of horny clues if you smeared your body with clue musk and did the clue mating dance."
When she get's bitchy, SPANK THAT ASS! (#Y#)
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05-25-2010
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#15
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Join Date: Jun 2009
Location: Plymouth
Drives: 03 TB EVO
Posts: 164
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Re: Low Vac at idle
I have the FP intake pipe with BOV return, so i just routed the charcoal canister hose down behind the firewall, would that cause loss of vacuum? I would think not considering it is blowing out fumes, but im not 100% sure, so i figured id ask.
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