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HVAC exit in the intake manifold. Usage?

Old 07-15-2015, 07:17 PM
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Default HVAC exit in the intake manifold. Usage?

Hi guys, could I use the HVAC exit of my LS6 intake manifold to turn the pressure to Fuel Pressure Regulator?


Old 07-16-2015, 07:19 AM
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Yes you can just make sure the fuel pressure regulator is plumbed in right at the intake manifold. If you follow the hose for the HVAC there is a one way check valve in the line. You don't want it plumbed in after that or you'll have some issues.

Are you still pulling vacuum on the HVAC system ? Is this going to be forced induction ?
Old 07-16-2015, 03:22 PM
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Originally Posted by conan
Yes you can just make sure the fuel pressure regulator is plumbed in right at the intake manifold. If you follow the hose for the HVAC there is a one way check valve in the line. You don't want it plumbed in after that or you'll have some issues.

Are you still pulling vacuum on the HVAC system ? Is this going to be forced induction ?
I'm not using the HVAC system. I have only the exit like the picture.
I turn on the brake booster in the brake booster port and there is the other port left.

It will be forced induction, twin turbo. Could I conect the fuel press regulator air hose there?
The map sensor will hang in there with positive pressure?

Thanks Conan
Old 07-16-2015, 07:00 PM
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If the HVAC isn't used you can use that for the FPR no problem. I have never had any issues with the MAP sensor popping out under boost, and haven't read of any problems with it on the LS6.

Are you going to run the EVAP solenoid on the driver side of the manifold ?
Old 07-16-2015, 07:47 PM
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Originally Posted by conan
If the HVAC isn't used you can use that for the FPR no problem. I have never had any issues with the MAP sensor popping out under boost, and haven't read of any problems with it on the LS6.

Are you going to run the EVAP solenoid on the driver side of the manifold ?
Now the IAT sensor is there


and in the other side I connect the BOV hose
Old 07-17-2015, 08:18 AM
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The port your using for the BOV was for the EVAP then. Does that cover all the vacuum operated systems in your build or do you need to hook up other things ?
Old 07-18-2015, 03:27 PM
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Originally Posted by conan
The port your using for the BOV was for the EVAP then. Does that cover all the vacuum operated systems in your build or do you need to hook up other things ?

Honestly I dont know.
I look at all and don't see any other place that need to be closed...

Do you remember some specific?

Thanks for your help!
Old 07-18-2015, 10:44 PM
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I should have asked how many vacuum operated systems do you have on the car ?

For example, I have 5 vacuum / pressure operated systems. Hobbs switch, by pass valve, boost gauge, HVHC trap door, and meth injection. So I bought a manifold and plumbed everything to that. I feed it with the HVHC port you were asking about in your first post, and the PCV port on the front. Then I capped the EVAP on the drivers side with a silicone cap. Here's getting started...


Old 07-20-2015, 11:14 PM
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Originally Posted by conan
I should have asked how many vacuum operated systems do you have on the car ?

For example, I have 5 vacuum / pressure operated systems. Hobbs switch, by pass valve, boost gauge, HVHC trap door, and meth injection. So I bought a manifold and plumbed everything to that. I feed it with the HVHC port you were asking about in your first post, and the PCV port on the front. Then I capped the EVAP on the drivers side with a silicone cap. Here's getting started...


nice man!
Old 07-26-2015, 01:45 PM
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and about the oil feed line for the turbos?

I put a Y with two 6an lines going to turbos, from the oil exit in the back of the block.

Do you think it's ok to use this?

tks
Old 07-28-2015, 06:48 AM
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Originally Posted by SWRocket
and about the oil feed line for the turbos?

I put a Y with two 6an lines going to turbos, from the oil exit in the back of the block.

Do you think it's ok to use this?

tks
I would post that question up in the forced induction section. I don't have any first hand experience with oil lines for turbos. I have seen alot of people buy a machined block that bolts up to the port in the side of the engine block above the oil filter.

Here's what I have seen the turbo guys use... http://www.cbrperformanceproducts.co...ck_p/1002m.htm

Last edited by conan; 07-28-2015 at 01:38 PM.
Old 07-28-2015, 05:35 PM
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Originally Posted by conan
I would post that question up in the forced induction section. I don't have any first hand experience with oil lines for turbos. I have seen alot of people buy a machined block that bolts up to the port in the side of the engine block above the oil filter.

Here's what I have seen the turbo guys use... http://www.cbrperformanceproducts.co...ck_p/1002m.htm
I alredy use the port in the side to do the IN and OUT oil line for the Oil Cooler, using the Improved oil cooler adapter


Old 07-28-2015, 05:42 PM
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here you could see in my engine the oil lines from the exit in the rear of the block to feed turbos


here the exit in the rear cover by blacktape before I assembly the feed lines, using a Y fitting

Old 07-29-2015, 06:59 AM
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The pic above with the red arrow is the oil pressure sending unit hole. Don't see why that would be a problem to use for feeding oil to your turbos.
Old 07-31-2015, 11:55 AM
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Originally Posted by conan
The pic above with the red arrow is the oil pressure sending unit hole. Don't see why that would be a problem to use for feeding oil to your turbos.
nice! tks man
Old 10-03-2017, 03:19 PM
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If I am removing AC from my car for my turbo kit, what use does the HVAC port on the back of the intake serve?
Old 10-06-2017, 02:48 PM
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Originally Posted by 02ws666
If I am removing AC from my car for my turbo kit, what use does the HVAC port on the back of the intake serve?
You can use the port for any vacuum source you need or block it off.
Old 10-07-2017, 07:43 AM
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To point out, with an adjustable FPR, if you reference just boost it will work as designed. If you reference vacuum AND boost (manifold hook up) you'll need to flatline your fuel flow ratings on your injectors in the tune.


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