 NA vacuum pressure, Quick Question |
 Oct 16, 2006 - 1:34 PM
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 Enthusiast  Joined Jun 1, '03 From WV Currently Offline Reputation: 2 (100%)  |
I've happend apon a cheap boost gauge that messures up to 30+ & -. I'm wonding if this is enough to messure the vacuum pressure. I'm worried that it won't. I just want to know the deference in pressure as the rpms go up or down.
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Replies
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Oct 24, 2006 - 12:21 AM
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 Enthusiast Joined Mar 27, '04 Currently Offline Reputation: 14 (100%) |
well i got them installed today.. but little confused.. looks like the vacuum will read about 22 when idling.. and when i gas it it jumps down closer to 10 or 5.. but I thought if I left the gas there then the vacuum will stay there.. IE, the more gas the less vacuum...but if i give it steady gas it seems to jump down to 10 ish then go back up to 20.. is that normal?
i'll drive it tomorrow to see how it does.. -------------------- ~Daniel~ No Longer Celica Owner.. moved on to a 03 WRX-EJ207
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Oct 24, 2006 - 2:08 AM
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 Enthusiast Joined Mar 17, '06 Currently Offline Reputation: 0 (0%) |
QUOTE(Jaws4God @ Oct 24, 2006 - 1:21 AM) [snapback]495357[/snapback] well i got them installed today.. but little confused.. looks like the vacuum will read about 22 when idling.. and when i gas it it jumps down closer to 10 or 5.. but I thought if I left the gas there then the vacuum will stay there.. IE, the more gas the less vacuum...but if i give it steady gas it seems to jump down to 10 ish then go back up to 20.. is that normal? i'll drive it tomorrow to see how it does.. 22 inches at idle is good. When reving a parked engine a rapid return to high intake manifold vacuum (above readings at idle) is normal. On the road the engine will give the readings you may anticipate due to engine load and vacuum characteristics. As you drive with Wide Open Throttle (Accelerator fully depressed) there will be virtually no engine vacuum. Zero inches indicates that there no difference between the normal atmospheric (outside the engine) pressure and the pressure (within the engine) at ported intake manifold source. However as rpm increases at part throttle vacuum #'s will rise (unless the engine is at W.O.T.) The extreme case is when you downshift and let off the throttle the readings will read somewhere around 30 inches until engine rpm decreases and/or the throttle is opened. You'll soon see this as you drive and watch the readings when you drive. The vacuum gauge is a good diagnostic tool. It can indicate if an engine is running properly. Many common engine problems can be discovered/ noticed and then diagnosed with the aid of a vacuum gauge. Yellow94GT This post has been edited by Yellow94GT: Oct 24, 2006 - 2:09 AM |
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Oct 24, 2006 - 7:52 AM
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Enthusiast Joined Mar 27, '04 Currently Offline Reputation: 14 (100%) |
QUOTE(Yellow94GT @ Oct 24, 2006 - 7:08 AM) [snapback]495384[/snapback] QUOTE(Jaws4God @ Oct 24, 2006 - 1:21 AM) [snapback]495357[/snapback] well i got them installed today.. but little confused.. looks like the vacuum will read about 22 when idling.. and when i gas it it jumps down closer to 10 or 5.. but I thought if I left the gas there then the vacuum will stay there.. IE, the more gas the less vacuum...but if i give it steady gas it seems to jump down to 10 ish then go back up to 20.. is that normal? i'll drive it tomorrow to see how it does.. 22 inches at idle is good. When reving a parked engine a rapid return to high intake manifold vacuum (above readings at idle) is normal. On the road the engine will give the readings you may anticipate due to engine load and vacuum characteristics. As you drive with Wide Open Throttle (Accelerator fully depressed) there will be virtually no engine vacuum. Zero inches indicates that there no difference between the normal atmospheric (outside the engine) pressure and the pressure (within the engine) at ported intake manifold source. However as rpm increases at part throttle vacuum #'s will rise (unless the engine is at W.O.T.) The extreme case is when you downshift and let off the throttle the readings will read somewhere around 30 inches until engine rpm decreases and/or the throttle is opened. You'll soon see this as you drive and watch the readings when you drive. The vacuum gauge is a good diagnostic tool. It can indicate if an engine is running properly. Many common engine problems can be discovered/ noticed and then diagnosed with the aid of a vacuum gauge. Yellow94GT YOU DA MAN!! Drove it to work today, you were right.. it did what I expected... Thanks!!! -------------------- ~Daniel~ No Longer Celica Owner.. moved on to a 03 WRX-EJ207
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Oct 25, 2006 - 7:28 AM
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Enthusiast Joined Mar 17, '06 Currently Offline Reputation: 0 (0%) |
QUOTE YOU DA MAN!! Drove it to work today, you were right.. it did what I expected... Thanks!!! NICE!  Nothing like an invigorating commute to make the day complete. Yellow94GT |
Posts in this topic
Bigmeanbulldog55 NA vacuum pressure Oct 16, 2006 - 1:34 PM
Jaws4God I'm not sure if its the same for all cars, but... Oct 16, 2006 - 5:00 PM Bigmeanbulldog55 I had a feeling it was around that. That's wh... Oct 16, 2006 - 5:49 PM presure2 at warm idle, a 5sfe should see between -18 - -22 ... Oct 16, 2006 - 6:48 PM Jaws4God do you all have a pic of how to run the hose to re... Oct 16, 2006 - 7:18 PM Bigmeanbulldog55 QUOTE(presure2 @ Oct 16, 2006 - 7:48... Oct 16, 2006 - 7:48 PM
presure2 QUOTE(Bigmeanbulldog55 @ Oct 16, 2006 - ... Oct 16, 2006 - 8:00 PM n1ckz0r bulldog, please post your results when you get the... Oct 16, 2006 - 10:52 PM CarneDeBlaQ I've got a boost/vacuum gauge on my 90 5sfe gt... Oct 18, 2006 - 6:10 AM Jaws4God QUOTE(CarneDeBlaQ @ Oct 18, 2006 - 11... Oct 18, 2006 - 9:17 AM hitcachi If you need more, let me know.
oh Jaws, and abou... Oct 18, 2006 - 10:31 AM CarneDeBlaQ Hitcachi's location is fine, but you can hook ... Oct 18, 2006 - 1:57 PM Jaws4God Cool!! thank you hitcachi thats exactly w... Oct 18, 2006 - 3:11 PM hitcachi the boot for the steering rack and pinon. Props to... Oct 18, 2006 - 4:19 PM Jaws4God QUOTE(Yellow94GT @ Oct 25, 2006 - 12... Oct 25, 2006 - 11:31 AM |
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