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Is there any need for the brake booster to be connected to the manifold?

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Old 02-13-2019, 04:27 PM
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jimxms
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Default Is there any need for the brake booster to be connected to the manifold?

As far as I can see, the C7 has a very good electric vacuum pump. The same pump used by EV's and Diesel vehicles that have little/no engine vacuum available. I'm also running a big cam, so I probably don't have much engine vacuum either.

Therefore, is there any reason why the brake booster needs to be connected to the intake manifold?

The reason I ask is that I'd ideally like to use the port on the back of my intake manifold for my IAT sensor (rather than right after the throttle body) for a more accurate air temp reading when spraying meth.

Last edited by jimxms; 02-13-2019 at 04:42 PM.
Old 02-15-2019, 04:58 PM
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Avanti
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Carefully, try and see.
Old 02-16-2019, 11:48 AM
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BrunoTheMellow
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Originally Posted by jimxms
As far as I can see, the C7 has a very good electric vacuum pump. The same pump used by EV's and Diesel vehicles that have little/no engine vacuum available. I'm also running a big cam, so I probably don't have much engine vacuum either.

Therefore, is there any reason why the brake booster needs to be connected to the intake manifold?

The reason I ask is that I'd ideally like to use the port on the back of my intake manifold for my IAT sensor (rather than right after the throttle body) for a more accurate air temp reading when spraying meth.
Can you tee off that port? Since you're only going to use it for a sensor?
Old 02-16-2019, 11:52 AM
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jimxms
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Originally Posted by BrunoTheMellow
Can you tee off that port? Since you're only going to use it for a sensor?
Sadly not as it was the air temp sensor and it needs to be right in the flow I think.

I aborted the idea anyway and just drilled a hole in the bottom
of the intake.
Old 02-16-2019, 05:25 PM
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Bill Dearborn
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If it wasn't needed I doubt GM would have used it. It costs money for auto companies to do something and if they don't have to do it they don't spend that money. Basic rule of thumb to apply is if it cost them something to install they did it for a reason. If it looks like there isn't a reason for something rethink what you are doing since they don't do stuff they don't have to do.

Bill
Old 02-17-2019, 02:44 AM
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Originally Posted by Bill Dearborn
If it wasn't needed I doubt GM would have used it. It costs money for auto companies to do something and if they don't have to do it they don't spend that money. Basic rule of thumb to apply is if it cost them something to install they did it for a reason. If it looks like there isn't a reason for something rethink what you are doing since they don't do stuff they don't have to do.

Bill
Its not the vac pump I’m questioning, it’s the link between the manifold and the brake booster. I assume that’s only there because the engine vacuum is a good back-up if the vac pump fails. However with a very large cam I have hardly any vacuum anyway, so it probably makes that section of pipework redundant. Thats my best guess anyway.

Last edited by jimxms; 02-17-2019 at 03:20 AM.

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