Boost gaugeb reading
03-11-02, 06:51 PM
#1
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Boost gaugeb reading
My vac psi is 15 psi.. good or bad.. what is good range?
I removed air pump.. is that matter?
i think my vac used to be 16-17.... anyway.. 15 is good enough?
I removed air pump.. is that matter?
i think my vac used to be 16-17.... anyway.. 15 is good enough?
03-11-02, 07:02 PM
#5
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I donno if that is good, or good enough, I just know that when I read other threads on idle vacuum the question was always asked what the idle RPM was when they were looking at the vacuum reading, figured I would at least help you get more helpful information out there so the pro's could toss in their 2cents.
K
K
03-11-02, 07:12 PM
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I'm not one of the pros, but hear that 15 to 20, is good. Seems that would show overall good health of the system. Such as your vac. lines and all. A sudden change would indicate problems, and you would check accordingly. At idle, i show about 19lb. I may be wrong, and I've got a lot to learn, but I've had mine for about a year and a half now, and I've never had any trouble.
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03-11-02, 07:20 PM
#8
Idle vaccum readings are not measured in lbs/psi, that would indicate a positive reading.. ie. something under pressure. Vaccum is measured in Hg, the metric scale is something else.. can't think of it off the top of my head. I think 15Hg is a little low but it could be a lot of things other than bad compression.. vacuum leakage, gasket leakage, high idle, bad plugs, timing.. etc.
Matt
93 SSM
Matt
93 SSM
03-11-02, 10:09 PM
#11
I'm a CF and poop smith
when i first start my car my idle bounces and i get about 15-16 inhg and when my car warms up all the way, it is about 19.7 inhg. are you sure your not reading in inhg and not psi?
03-12-02, 08:56 AM
#12
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high is good right?
today when i started the car hgmm was 15-16... and when car got warmed up it was 15..
Removing air pump matter? recently i removed air pump.
Thanks
today when i started the car hgmm was 15-16... and when car got warmed up it was 15..
Removing air pump matter? recently i removed air pump.
Thanks
03-12-02, 10:35 AM
#14
Originally posted by FstFD3SPOWER
high is good right?
today when i started the car hgmm was 15-16... and when car got warmed up it was 15..
Removing air pump matter? recently i removed air pump.
Thanks
high is good right?
today when i started the car hgmm was 15-16... and when car got warmed up it was 15..
Removing air pump matter? recently i removed air pump.
Thanks
Is your engine stock or street ported? 12-15 would be normal for a street port. Non-ported should be around 16-19.
Idle should be about 16 - 18 in Hg.
Max boost should be about 10 PSI (for a stock car).
________________
Date: Thu, 29 Jun 2000 16:36:11 -0700 (PDT)
From: RETed (reted_2000@yahoo.com)
> My car idles at about 750 RPMs. Is the vacuum reading a sign of how
> aggressive the porting is?
Yes.
* Normal stock motor will show 18" or better.
* Mildly ported motors show 14"-16".
* Heavily ported motors can go down to 10"-12".
Max boost should be about 10 PSI (for a stock car).
________________
Date: Thu, 29 Jun 2000 16:36:11 -0700 (PDT)
From: RETed (reted_2000@yahoo.com)
> My car idles at about 750 RPMs. Is the vacuum reading a sign of how
> aggressive the porting is?
Yes.
* Normal stock motor will show 18" or better.
* Mildly ported motors show 14"-16".
* Heavily ported motors can go down to 10"-12".
03-12-02, 11:51 AM
#15
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Originally posted by RedFD
I got 25-27 last time i checked
I got 25-27 last time i checked
03-12-02, 09:29 PM
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Originally posted by FstFD3SPOWER
What kind of problem i might have?
What kind of problem i might have?
03-13-02, 03:37 PM
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Originally posted by FstFD3SPOWER
i god autometer gauge btw... are they accurate?
on my avc r it says 480mm/hg/.
i god autometer gauge btw... are they accurate?
on my avc r it says 480mm/hg/.
03-13-02, 04:06 PM
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Originally posted by rynberg
I don't think it is possible to pull that much vacuum. Are you sure your gauge isn't marked in cm of Hg? 25-27cm would be 9-10 inches of vacuum.
I don't think it is possible to pull that much vacuum. Are you sure your gauge isn't marked in cm of Hg? 25-27cm would be 9-10 inches of vacuum.