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Holley boost control-co2 or compressor air?

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Old 08-24-2016, 12:30 PM
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Originally Posted by stevieturbo
very very very rudimentary.

There are various issues that could affect how much you apply to the top.....yet nothing to do with backpressure.
Agreed rudimentary and there are certainly other possible contributing factors But it absolutely has to do with BP. Did you not read anything I just wrote? I don't understand how you could possibly think the amount of measured pressure to keep the waste gate valve closed has "absolutely nothing" to do with the amount of exhaust gas pressure build up on the other side.

Last edited by oscs; 08-24-2016 at 01:43 PM.
Old 08-24-2016, 12:40 PM
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I use a viair onboard air system. works great and it'll save your *** if you ever get a flat being able to air a tire up to make it wherever you are going
Old 08-24-2016, 06:40 PM
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Whats wrong with using a traditional controller like a profec B? $150~ done
Old 08-25-2016, 10:18 AM
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Well I'm leaning towards co2 it's about 15-20 to fill 5lb bottle. Plus I have about 20f of 4an pushloc hose already.


Old 08-25-2016, 11:17 AM
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Make sure you buy a good regulator. I bought a cheap one and it failed during a race event. Boost was all over the place.
Old 08-25-2016, 12:09 PM
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The one pictured was rated pretty good I also have one already but it's being use for my keg/bar set up.
Old 08-25-2016, 12:27 PM
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Originally Posted by Busted67
The one pictured was rated pretty good I also have one already but it's being use for my keg/bar set up.
I bought a Harris welding regulator. Never had a problem after. I think it was around $100
Old 08-25-2016, 02:54 PM
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Originally Posted by kingtal0n
Whats wrong with using a traditional controller like a profec B? $150~ done
Because ecu control offers so much more than very basic boost control.
Old 08-29-2016, 01:31 AM
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if you are not trying to run a light spring with a ton of boost i see no reason to go co2.
or if its a 100% track car i could see some control advantages with co2 but not on a street car
Old 08-29-2016, 04:29 AM
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Originally Posted by runsfromdacops
if you are not trying to run a light spring with a ton of boost i see no reason to go co2.
or if its a 100% track car i could see some control advantages with co2 but not on a street car
The benefit some say for Co2 on a street car is effectively you can blow the gate open at zero boost...so that gives you the best chance of running the lowest boost possible for your system which gives more scope for ramping boost with speed etc to assist traction.

With normal manifold air, this low setting is dictated by spring pressure, with high pressure air you could just blow the gate open against the spring.
Old 08-29-2016, 06:50 AM
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Originally Posted by stevieturbo
The benefit some say for Co2 on a street car is effectively you can blow the gate open at zero boost...so that gives you the best chance of running the lowest boost possible for your system which gives more scope for ramping boost with speed etc to assist traction.

With normal manifold air, this low setting is dictated by spring pressure, with high pressure air you could just blow the gate open against the spring.
This.
Old 08-29-2016, 12:12 PM
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Ordered the 5lb tank and regulator. Hopefully have it mounted this weekend. Anyone have a guess on how long a 5lb will last on a streetcar 2000-2500 miles a year.
Old 08-29-2016, 12:51 PM
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Originally Posted by Busted67
Ordered the 5lb tank and regulator. Hopefully have it mounted this weekend. Anyone have a guess on how long a 5lb will last on a streetcar 2000-2500 miles a year.
Well you could drive 5000 miles and not even get on boost...or drive 50 miles going mental on boost all the time.

When boost control is active it will use air/gas, when it isnt, it wont.
Old 08-29-2016, 01:19 PM
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Originally Posted by stevieturbo
Well you could drive 5000 miles and not even get on boost...or drive 50 miles going mental on boost all the time.

When boost control is active it will use air/gas, when it isnt, it wont.
This is true I guess I'll have to see when I get it running.
Old 08-29-2016, 01:39 PM
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Originally Posted by Busted67
This is true I guess I'll have to see when I get it running.
A lot longer than you think. If used "normally" set base to 50-60psi
Old 08-30-2016, 08:14 PM
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Holley uses duty cycle %, so how would you get back pressure out of that or am I missing something?

Also, make sure that you leak test it to maximize the life of the co2.
Old 08-30-2016, 10:59 PM
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I put the ViAir compressor setup in mine. Seems to work good with my holley dual solenoids, using dome control.
Old 08-31-2016, 07:12 AM
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Originally Posted by 98Camarod
Holley uses duty cycle %, so how would you get back pressure out of that or am I missing something?

Also, make sure that you leak test it to maximize the life of the co2.
I don't understand what your asking. What does the method Holley uses to control its solenoids have to do with the simple formula for motoring BP? Maybe I'm missing something.
Old 08-31-2016, 09:08 PM
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Originally Posted by stevieturbo
The benefit some say for Co2 on a street car is effectively you can blow the gate open at zero boost...so that gives you the best chance of running the lowest boost possible for your system which gives more scope for ramping boost with speed etc to assist traction.
Ah ha! That is an incredible feature. <3 kingtal0n likes this

and here I have been jamming the gate open with wire ties, loaded with flashpowder squips each set to detonate in sequence thereby releasing the gate spring more and more as speed increases (not really!)

Last edited by kingtal0n; 08-31-2016 at 10:16 PM.
Old 09-01-2016, 06:24 PM
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Co2 bottle came in also made a aluminum bracke for it.










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