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Old 10-31-2013, 01:10 AM   #1
gkviper192
 
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Intake sizes... How big is too big ?

OK so I'm not familiar with how many different brand CAI's there are for the zl1 but I have a couple questions. Which brand has the largest diameter intake tube? Has it been tested against any of the smaller intakes to see if there is a difference in power? Once you get to something like a 4 inch intake, will going to a 4.5 or even 5 inch diameter pick up power on a stock or modified car? Looking for some insight on this since the blower can only spin so fast it makes me curious.

Thanks,
Greg
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Old 10-31-2013, 06:28 AM   #2
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Ive tried a lot of intakes biggest one is airaid
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Old 10-31-2013, 06:35 AM   #3
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not sure about the inlet tube but the roto fab has the biggest filter
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Old 10-31-2013, 07:33 AM   #4
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Ive tried a lot of intakes biggest one is airaid
I personally like the look of the airraid one, because it closely resembles the one on the new Z28. I wonder why it is one od the few that require a tune?
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Old 10-31-2013, 08:05 AM   #5
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Airaid is the biggest and our logs have shown it moves/supports the most airflow. On the same setup it was worth an additional 12rwhp but they all work great!
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Old 10-31-2013, 12:00 PM   #6
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They all work great but we prefer roto-fab or airaid they both are local to us here in AZ so it's nice being able to help someone local plus getting parts fast. if you want any pricing let us know
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Old 10-31-2013, 06:14 PM   #7
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i have airaid with modded airbox and IATs run pretty close to ambient and o have lot of power compared to other intakes
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Old 11-04-2013, 10:29 AM   #8
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Originally Posted by gkviper192 View Post
OK so I'm not familiar with how many different brand CAI's there are for the zl1 but I have a couple questions. Which brand has the largest diameter intake tube? Has it been tested against any of the smaller intakes to see if there is a difference in power? Once you get to something like a 4 inch intake, will going to a 4.5 or even 5 inch diameter pick up power on a stock or modified car? Looking for some insight on this since the blower can only spin so fast it makes me curious.

Thanks,
Greg
Your engine is a big air pump. As long as the tube and/or filter is not restricting airflow, it does not matter how big of diameter you go. Your motor is not changing and still is pumping the same.

Put it this way. Lets just say your engine pulls 500 CFM, and you have a 4" tube and an air filter that are each capable of pulling 1000 CFM, there is no restriction on your airflow. Now you go to a 6" tube and a bigger air filter, each capable of pulling 1500 CFM. Do you think your motor is going to make more power? No it will not, your motor is still pulling the same amount 500 CFM regardless. On top of that, if your tube is a lot bigger than the TB, depending on how you have to reduce it down you can actually cause more airflow issues with turbulence. This is where having a flow bench and design software with airflow simulations and being able to test these things takes its part in development.

I hope that helps.
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Old 11-04-2013, 10:25 PM   #9
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There will be a difference, how much of a difference, I cannot say for sure, at these sizes the difference could be negligible. But working as a refrigeration tech I know about pipe sizing for our systems, and one of the things you are looking for is pressure drop, so while a system could work with a smaller pipe size you lose a small bit of your capacity due to the added resistance caused by the smaller pipe. That being said there is a point of diminishing returns for example a 6" intake vs a 10" intake would more than likely be 100% the same , on an engine like the LSA
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Old 11-08-2013, 12:09 PM   #10
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Quote:
Originally Posted by gkviper192 View Post
OK so I'm not familiar with how many different brand CAI's there are for the zl1 but I have a couple questions. Which brand has the largest diameter intake tube? Has it been tested against any of the smaller intakes to see if there is a difference in power? Once you get to something like a 4 inch intake, will going to a 4.5 or even 5 inch diameter pick up power on a stock or modified car? Looking for some insight on this since the blower can only spin so fast it makes me curious.

Thanks,
Greg
Hello Greg, What you need to consider is the tube is also a Torque reporting device and the size of the tube is critical to this calculation.

This is a Case Where bigger is NOT better.

The 4 inch inlet tube is appox 102 mm the throttle body is 87 MM or 90 if you use an LS3 TB.

So you can see that the intake tube is not the restriction.

The 4 inch inlet tube can flow More air than the engine can consume.

Ted.
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