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Vac/Boost Readings

 
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Old 04 Jan 2011, 08:42 pm
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Post Vac/Boost Readings

Its been a while but i finally got around to installing my boost gauge. I would appreciate it is someone else that has a boost gauge installed could diagnose my numbers and tell me if they sound alright:
*Idle at normal operating temp.=17in. vac.
*i punched it in 2nd gear to about 85% throttle and it got to 11psi boost before shifting(atx).
The temp outside was 45 F and elevation was 1700ft. if that makes much difference.
To me, the boost looks good, but the idle vacuum seems a little low compared to other 4-cylinders ive owned, but of course each engine is different, so does everything seem ok? Thanks
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Old 09 Jan 2011, 02:17 am
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Default Re: Vac/Boost Readings

17inHg with A/C on or off? Heat on or off? Mine dips slightly if either of those are on. With them off, I usually sit around 21-23inHg at idle-- just for reference.
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Old 09 Jan 2011, 03:00 am
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Default Re: Vac/Boost Readings

I too sit at about 20-21 at idle.

Think someone on PTCrew just recently said they were sitting at 17? Or was that you?

If your car is stock, I'd say 11lbs is about right (I'm sure altitude would have a little to do with this as well). I was at 13lbs when my car was stock.
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Old 09 Jan 2011, 08:08 pm
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Default Re: Vac/Boost Readings

Nothing was on, just started and went.
I think the altitude affected it a lot. Today I drove back home and when I got here (1000ft altitude), the gauge was almost to 19 in. at idle.
Also, I thought the vacuum was supposed to be highest at idle, but today i was going over a long steep hill in 4th gear(auto) and wasnt touching the throttle and as the rpms gradually went down, the vacuum kept rising and by the time the rpms had fallen to 1200, the vacuum was like 24-25 in. This may be normal, but wouldnt that and the 11 lbs boost pretty much rule out any leaks?

Last edited by 05PTGT; 09 Jan 2011 at 08:22 pm.
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Old 10 Jan 2011, 12:46 am
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Default Re: Vac/Boost Readings

You could still have leaks even if you're getting boost/vaccuum readings.

Up until a few days ago, I've been spiking at 19lbs and holding 15-16lbs. Now I'm spiking at 13lbs and hearing a leak when I push it. You'll still get vaccuum+boost, but the thing is your turbo is working harder because it's trying to 'achieve' a certain amount of boost (controlled via PCM) and having to compensate for a leak. The higher you go in gear, the more boost your engine requires if you're pushing it.

Btw, no boosting in 4th!
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