Boost loss thru Intercooler
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Post Fiend
Joined: Mar 2007
Posts: 9,010
Likes: 5
From: Johnson City, TN.
Boost loss thru Intercooler
Just thought some of you may want some of this info.
I now have a 6.ooh intercooler with the H2E kit. I also have a gauge that is a double gauge for boost. I hooked one of the lines to the Y-pipe so I can see true boost that is going in the engine. I hooked the other one up at the map sensor So I can see what it sees also.
Between the two gauges I see 2psi difference. That is at ALL boost pressures. I have not ran it hard like drag racing or sled pulling yet but everyday driving and the ocassional pass in the fast lane shows 2psi loss at the Y-pipe.
I now have a 6.ooh intercooler with the H2E kit. I also have a gauge that is a double gauge for boost. I hooked one of the lines to the Y-pipe so I can see true boost that is going in the engine. I hooked the other one up at the map sensor So I can see what it sees also.
Between the two gauges I see 2psi difference. That is at ALL boost pressures. I have not ran it hard like drag racing or sled pulling yet but everyday driving and the ocassional pass in the fast lane shows 2psi loss at the Y-pipe.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,508
Likes: 2
From: The boonies by Dallas OR
It's all resistance. Cooling the air reduces it's volume which makes for more room for air inside. The room for more air reduces the total boost, but he's comparing boost into the cooler to boost out of the cooler. The difference in pressure is the resistance.
Elder User
Joined: Sep 2005
Posts: 971
Likes: 0
From: Melbourne FL.
Just thought some of you may want some of this info.
I now have a 6.ooh intercooler with the H2E kit. I also have a gauge that is a double gauge for boost. I hooked one of the lines to the Y-pipe so I can see true boost that is going in the engine. I hooked the other one up at the map sensor So I can see what it sees also.
Between the two gauges I see 2psi difference. That is at ALL boost pressures. I have not ran it hard like drag racing or sled pulling yet but everyday driving and the ocassional pass in the fast lane shows 2psi loss at the Y-pipe.
I now have a 6.ooh intercooler with the H2E kit. I also have a gauge that is a double gauge for boost. I hooked one of the lines to the Y-pipe so I can see true boost that is going in the engine. I hooked the other one up at the map sensor So I can see what it sees also.
Between the two gauges I see 2psi difference. That is at ALL boost pressures. I have not ran it hard like drag racing or sled pulling yet but everyday driving and the ocassional pass in the fast lane shows 2psi loss at the Y-pipe.
That about what I noticed after my cooler install too. IT was 2-3 lower.
Postmaster
Joined: Dec 2003
Posts: 2,864
Likes: 0
From: STEPHENVILLE,TX!!!!!
yeah our ics will loose 2-3. spearco's are about 1psi and the water to air im working on should be less than 1psi and instead of 5' of tubing theres only a foot
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Post Fiend
Joined: Mar 2007
Posts: 9,010
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From: Johnson City, TN.
Why would spearco's be only 1? Is ib because they are thicker aluminum and don't flex as much or is it better flow thru?
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Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Just thought I would throw this out there
Isn't volume more important than pressure?
Wouldn't a pressure loss through the IC be a good thing
vs. a pressure increase. If the pressure went up it would mean
the IC is a restriction??
But I don't not understand how the volume would increase going though the IC. Is it the cooler/denser air cause the volume increase? If so, how much could that be? I flunked Physics LOL
Isn't volume more important than pressure?
Wouldn't a pressure loss through the IC be a good thing
vs. a pressure increase. If the pressure went up it would mean
the IC is a restriction??
But I don't not understand how the volume would increase going though the IC. Is it the cooler/denser air cause the volume increase? If so, how much could that be? I flunked Physics LOL
Elder User
Joined: Sep 2005
Posts: 971
Likes: 0
From: Melbourne FL.
Just thought I would throw this out there
Isn't volume more important than pressure?
Wouldn't a pressure loss through the IC be a good thing
vs. a pressure increase. If the pressure went up it would mean
the IC is a restriction??
But I don't not understand how the volume would increase going though the IC. Is it the cooler/denser air cause the volume increase? If so, how much could that be? I flunked Physics LOL
Isn't volume more important than pressure?
Wouldn't a pressure loss through the IC be a good thing
vs. a pressure increase. If the pressure went up it would mean
the IC is a restriction??
But I don't not understand how the volume would increase going though the IC. Is it the cooler/denser air cause the volume increase? If so, how much could that be? I flunked Physics LOL
It would be bad if the pressure increased on the hot side of the IC than what it was before the IC was in there. But I am getting the same psi on the hot side of the IC before and after the install. I just have less psi on the cold side. I belive the psi is lost becuse the volume increase of the air when it is cooled.
Elder User
Joined: Oct 2004
Posts: 782
Likes: 1
From: Olympia, WA
Without a pressure differential across the length of a fluid conduit, you won't get any flow. The pressure drop across the IC at a given flow rate is a measure of the impedance, so less drop is desirable, but the drop is always there with fluid flow and the higher the flow rate, the higher the pressure drop. Hope that makes sense and doesn't make me sound like a jackass.
Hotshot
Joined: Oct 2003
Posts: 17,791
Likes: 98
From: Ashland City, TN
Yea, heating and cooling can cause flow rate due to the way temperatures interact with each other.
Hot always goes to cold. So, like he said, a constant temperature though something doesn't induce flow.
But with what I said before.
No matter how much boost you have, a colder denser charge will always give more power. Hence, water cooling. =)
I'm sure there is a boost/temperature ratio chart someplace.
Hot always goes to cold. So, like he said, a constant temperature though something doesn't induce flow.
But with what I said before.
No matter how much boost you have, a colder denser charge will always give more power. Hence, water cooling. =)
I'm sure there is a boost/temperature ratio chart someplace.
Post Fiend
Joined: Oct 2003
Posts: 5,903
Likes: 1
From: MICHIGAN
Without a pressure differential across the length of a fluid conduit, you won't get any flow. The pressure drop across the IC at a given flow rate is a measure of the impedance, so less drop is desirable, but the drop is always there with fluid flow and the higher the flow rate, the higher the pressure drop. Hope that makes sense and doesn't make me sound like a jackass.
or at least hydrodynamics