Hydra vs Boost Gauge
Hydra vs Boost Gauge
which one is accurate? lol My boost going up shows the same however the gauge doesnt drop off at the upper rpms the 1 to 1.5psi the hydra shows. |
Boost leak somewhere? start checking connections.
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Mines always had a 1 psi offset from the gauge at 12 psi.
I've always assumed the gauge was out a bit. Does it matter? |
gauge can be off and also
gauge is relative pressure hydra is absolute pressure |
And. the length of the boost signal line matters. And same with if the gauge line or gauge has a restrictor.
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1 Attachment(s)
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Originally Posted by Faeflora
(Post 959574)
gauge can be off and also
gauge is relative pressure hydra is absolute pressure
Originally Posted by Faeflora
(Post 959575)
And. the length of the boost signal line matters.
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Originally Posted by albumleaf
(Post 959605)
Difference in psi between psi and psig is 14.7, not 1-1.5
Wrong, not over the timescale we're talking about here. Line affects responsiveness pretty significantly. This is especially important for your MAP sensor. Now go suck your cock fuckface. |
Originally Posted by Faeflora
(Post 959616)
No, I am fucking right about the damn boost gauge line and the gauge vs. hydra.
Line affects responsiveness pretty significantly. This is especially important for your MAP sensor. Now go suck your cock fuckface. |
The pressure displayed by the Hydra would be accurate if you were at sea level. It is absolute/ converted from kpa like Fae said.
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Originally Posted by Aricjm15
(Post 959924)
The pressure displayed by the Hydra would be accurate if you were at sea level. It is absolute/ converted from kpa like Fae said.
Like I said though, the difference between relative and absolute pressure is an order of magnitude more than the difference he's seeing, something else is the issue. |
No it reads in absolute. And displays in gauge pressure. The difference is because it does not compensate for altitude. If you owned and used a hydra you would probably understand.
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The difference of absolute vs relative pressure would be seen at idle or even when the car is off. In other words the difference would be there at all times.
Now the OP says his hydra reading drops down while the boost gauge stays stationary and that happens only at the upper rpms, it sounds more like theres a leak somewhere on the boost line going to the hydra. |
Originally Posted by Aricjm15
(Post 960149)
No it reads in absolute. And displays in gauge pressure. The difference is because it does not compensate for altitude. If you owned and used a hydra you would probably understand.
Fagflora thinks that somehow the 1-1.5psi difference is coming from the difference in absolute vs relative, when that's simply not the case. Neither the boost gauge nor the MAP sensor in the Hydra compensate for altitude, I'm not sure why you mentioned it. |
Originally Posted by albumleaf
(Post 960183)
Neither the boost gauge nor the MAP sensor in the Hydra compensate for altitude, I'm not sure why you mentioned it.
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Originally Posted by albumleaf
(Post 960183)
Fagflora thinks that somehow the 1-1.5psi difference is coming from the difference in absolute vs relative, when that's simply not the case. Neither the boost gauge nor the MAP sensor in the Hydra compensate for altitude, I'm not sure why you mentioned it.
I still say it can be the damn boost signal lines. If you want to argue with me about it then you haven't fucked around with tuning boost enough. |
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