Tapping s484 housing for WG boost reference?
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
A buddy of mine had a 4th gen Camaro setup for the local 1 mile races.
Had 3 springs in his wastegate and a manual controller maxed. Referenced from his compressor housing. Wouldn't build over 20 PSI. Decided to switch and reference from his intake manifold. Blew the engine on the very next hit.
The compressor housing was seeing 44 PSI. By the time it hit his intake, it was only 20 PSI. A lot of guys that fight issues with not being able to build boost or are having issues with a 'lazy' turbo are referencing from the compressor housing. They will always spool slower referencing from the housing because the wastegate will crack open earlier.
Referencing from the housing works great in some situations, like internal gates or with no intercooler. But even with the most efficient intercooler cores, there will be a pressure drop from the air being cooled and losing volume.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
You should always reference you wastegates and boost gauge from the same location.
A buddy of mine had a 4th gen Camaro setup for the local 1 mile races.
Had 3 springs in his wastegate and a manual controller maxed. Referenced from his compressor housing. Wouldn't build over 20 PSI. Decided to switch and reference from his intake manifold. Blew the engine on the very next hit.
The compressor housing was seeing 44 PSI. By the time it hit his intake, it was only 20 PSI. A lot of guys that fight issues with not being able to build boost or are having issues with a 'lazy' turbo are referencing from the compressor housing. They will always spool slower referencing from the housing because the wastegate will crack open earlier.
Referencing from the housing works great in some situations, like internal gates or with no intercooler. But even with the most efficient intercooler cores, there will be a pressure drop from the air being cooled and losing volume.
A buddy of mine had a 4th gen Camaro setup for the local 1 mile races.
Had 3 springs in his wastegate and a manual controller maxed. Referenced from his compressor housing. Wouldn't build over 20 PSI. Decided to switch and reference from his intake manifold. Blew the engine on the very next hit.
The compressor housing was seeing 44 PSI. By the time it hit his intake, it was only 20 PSI. A lot of guys that fight issues with not being able to build boost or are having issues with a 'lazy' turbo are referencing from the compressor housing. They will always spool slower referencing from the housing because the wastegate will crack open earlier.
Referencing from the housing works great in some situations, like internal gates or with no intercooler. But even with the most efficient intercooler cores, there will be a pressure drop from the air being cooled and losing volume.
That is how you are able to achieve higher pressures by leaking air and fooling the gate into working differently. Those leaks will skew any boost reading on a gauge.
And if you're saying someone had a setup that had 44psi at the turbo and only 20psi at the intake...as clearly stated before, they need beaten around the head with their shitty intercoolers and pipework for building such a terrible inefficient system.
Also sounds like he shouldnt be anywhere near a turbo car. I reference off the compressor and have no issue running base 7psi spring through to 30psi. It isnt rocket science.
I thought i read the more pressure on the gates the better? Even if its 2x or 3x the boost amount. Im still learning, everyday and reading about boost control.
Also i bought a vacuum distribution block with 6 ports. Plan on tying it in on the firewall via the back of the intake manifold at one of the larger ports. The other larger port will go to break booster, than i ll cap the rest of the ports off at the intake manifold. The distribution block was gunna run -4AN to BOV, and 2x -3AN, one for FPR, another for boost/vacuum gauge. It ll be clean n neat and I can use SS braidedline for the essentials (FPR, BOV, WGs,)
Also i bought a vacuum distribution block with 6 ports. Plan on tying it in on the firewall via the back of the intake manifold at one of the larger ports. The other larger port will go to break booster, than i ll cap the rest of the ports off at the intake manifold. The distribution block was gunna run -4AN to BOV, and 2x -3AN, one for FPR, another for boost/vacuum gauge. It ll be clean n neat and I can use SS braidedline for the essentials (FPR, BOV, WGs,)
I absolutely do not wanna run co2 or onboard air. But Im defly running the holley dominator system for many reasons. My car is a street car. Trying to figure out how to use the recommended holley solenoids/set up with compressor housing pressure. Even if its not ideal, its gotta be better than a MBC or running on WG springs. I also read WGs should never see vacuum.
Restricted User
Joined: Mar 2014
Posts: 7,192
Likes: 109
From: Ohio
NEVER EVER take a boost gauge reading from the same line going to a wastegate. There will always be leaks within the line to the gate and even bigger leaks when you start introducing "boost control".
That is how you are able to achieve higher pressures by leaking air and fooling the gate into working differently. Those leaks will skew any boost reading on a gauge.
And if you're saying someone had a setup that had 44psi at the turbo and only 20psi at the intake...as clearly stated before, they need beaten around the head with their shitty intercoolers and pipework for building such a terrible inefficient system.
Also sounds like he shouldnt be anywhere near a turbo car. I reference off the compressor and have no issue running base 7psi spring through to 30psi. It isnt rocket science.
That is how you are able to achieve higher pressures by leaking air and fooling the gate into working differently. Those leaks will skew any boost reading on a gauge.
And if you're saying someone had a setup that had 44psi at the turbo and only 20psi at the intake...as clearly stated before, they need beaten around the head with their shitty intercoolers and pipework for building such a terrible inefficient system.
Also sounds like he shouldnt be anywhere near a turbo car. I reference off the compressor and have no issue running base 7psi spring through to 30psi. It isnt rocket science.
I wouldn't say his combo was 'shitty'. He did manage 202 mph in the mile. He swapped from an ebay IC to a Bell core and the problem only got slightly better.
9 Second Club
Joined: Nov 2003
Posts: 13,616
Likes: 185
From: Norn Iron
I agree, which is why I recommend referencing them somewhere else. With the compressor housing, you only have 1 line as a choice.
I wouldn't say his combo was 'shitty'. He did manage 202 mph in the mile. He swapped from an ebay IC to a Bell core and the problem only got slightly better.
I wouldn't say his combo was 'shitty'. He did manage 202 mph in the mile. He swapped from an ebay IC to a Bell core and the problem only got slightly better.
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