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You think my CAI is a restriction?

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Old 08-29-2011, 11:13 AM
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You all hopefully know pvc is measured at OD not ID. So a 4.0 PVC pipe has a ID of 3.5-3.6 depending on the wall thickness
Old 08-29-2011, 11:13 AM
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Originally Posted by ak2007r6
2 feet of 4" PVC, a 4" PVC street elbow, two rubber couplings, a couple feet of 1/4" vinyl tubing and a couple 1/4" hose clamps and a fitting to put in place for the breather hose (I have part number written down somewhere.)

I figured there would be a write up on this forum for it but if there is not I can type one up. It really is very simple, took me 20-30 minutes tops and is a noticeable difference. The only thing I had to do different is in all the threads I read they were using 4" rubber couplings for their connections and I have to get a 4" to 3.5" reducer to fit mine. Not sure why mine was a little smaller (you think the 6.2 would have a bigger one than a 4.8 or 5.3).
Sweet! Now i have a project for this weekend

Your tb should be the same as the 5.3s. Im gonna measure mine and see what it comes out to.
Old 08-29-2011, 11:16 AM
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Originally Posted by BlackGMC
You all hopefully know pvc is measured at OD not ID. So a 4.0 PVC pipe has a ID of 3.5-3.6 depending on the wall thickness
What's the ID of an aftermarket cai?
Old 08-29-2011, 11:36 AM
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Originally Posted by 2007chevy5.3l
What's the ID of an aftermarket cai?
Depends on the CAI. The important thing about CAI most people fail to realize is how it affects the MAF readings. If there are curves before or after the maf it will affect the reading just the same as removing the mesh screen. IMO people see an increase in HP and throttle response when switchung to pvc is because they removed the curves and kept the airflow straight. If your cai has curves the best way to fix the airflow is log the MAF hertz then rotate the maf then relog. What your looking for is a more stable maf reading.
Old 08-29-2011, 11:47 AM
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Originally Posted by BlackGMC
You all hopefully know pvc is measured at OD not ID. So a 4.0 PVC pipe has a ID of 3.5-3.6 depending on the wall thickness
The outside diameter of both the air box and the TB was 3.5". Not sure what the inside diameter was of the original 4" to 4" rubber couplings but it was way to big so thats why I went back and got the reducer. Very nice and snug fit now.
Old 08-29-2011, 12:00 PM
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heres my 4" set-up. worked really well. Had to go back to my old K&N intake when I installed the TBSS intake because the LS3 TB would hit the coolant tube.
Old 08-29-2011, 12:07 PM
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Originally Posted by BlackGMC
Depends on the CAI. The important thing about CAI most people fail to realize is how it affects the MAF readings. If there are curves before or after the maf it will affect the reading just the same as removing the mesh screen. IMO people see an increase in HP and throttle response when switchung to pvc is because they removed the curves and kept the airflow straight. If your cai has curves the best way to fix the airflow is log the MAF hertz then rotate the maf then relog. What your looking for is a more stable maf reading.
I see. Im going to have to log mine and see where its at
Old 08-29-2011, 12:34 PM
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Originally Posted by AndysC3

heres my 4" set-up. worked really well. Had to go back to my old K&N intake when I installed the TBSS intake because the LS3 TB would hit the coolant tube.
This looks just like my cai intake setup that i have. But i see u went ahead and converted yours to 4" which is what i want to do. Ill be tryin this out this weekend. Thanks for all your inputs on this guys.
Old 08-29-2011, 01:13 PM
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Originally Posted by AndysC3

heres my 4" set-up. worked really well. Had to go back to my old K&N intake when I installed the TBSS intake because the LS3 TB would hit the coolant tube.
I like the elbow you have going to your TB a lot better, where did you pick that up from?
Old 08-29-2011, 01:19 PM
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I have a 4'' polished aluminum tube if you would be interested in building your own kit.. The more air you can get the better...


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