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Did a WOT 140hp test run recording the gauge this evening. Temperature was around 84*. The run was from 11mph to 70mph over approximately 10 seconds.
What I see in the video is the vacuum gauge sweeps up to 1 inHg fairly quickly as boost hits about 30psi and then it remains there constant throughout the rest of the run. Even as boost would drop and gain due to shifting and rpm, the gauge remained on 1 inHg.
Under all normal driving the needle remains at zero with little to no movement.
My assumption from this testing is the 6637 breathes freely with almost zero restriction up to about 30psi of boost. I’m using boost as a rough gauge of amount of airflow. 30-35psi remained the same 1 inHg of vacuum. Variance in rpm in the 30-35psi boost level also did not effect the vacuum reading.
Snapshot of video. This is just before the auto shifted to 3rd I believe. 140hp PHP tune, 34psi boost, 3400rpm, 1 inHg vacuum with the Donaldson Blue 6637 style filter. Zoom of gauge in previous video clip. 140hp PHP tune, 34psi boost, 3400rpm, 1 inHg vacuum with the Donaldson Blue 6637 style filter. The smudged number is a “5” and the outside increments are 1 inHg each. Refer to earlier post for visual of “zero” condition.
Stay tuned for more testing with the AIS.
On a side note, anyone need help installing an AIS system? I’ve got it down to around 10 minutes now.
Could EGT be our guide as to what amount of restriction is acceptable? Assuming the T4/SXE combo with a 6637 allows us to pull hard with no risk of EGT hitting 1250 degrees, any restriction that approaches or hits 1250 sustained EGT is our limit. Not sure if the exhaust starts to get smokey before that point or not. One idea anyway.
Oops I forgot to comment about this idea. I agree with the concept of letting EGT be the judge. The only problem with this is it is very difficult to get an A-B comparison for EGT between intakes. It’s hard enough to get a comparison between tune EGT while switching between hills.
So maybe I can say if EGT does not drastically suffer, mpg isn’t noticeably reduced, and smoke output is low then it is ok.
Funny thing is from my previous testing I felt like the smoke output was less with the AIS which goes completely against reason.
Looks like you guys could use something like this. Put it in place of the tube that the CCV feeds into.
Hey I think I’m deep enough into this silly study. I already moved up from evaluating based on the FM to an actual gauge. Now you’ve got me eyeing another tool.
I was thinking of using this for metering airflow.
Hey I think I’m deep enough into this silly study. I already moved up from evaluating based on the FM to an actual gauge. Now you’ve got me eyeing another tool.
I was thinking of using this for metering airflow.
As I have said many times before, I'm always happy to spend other people's money.
That instrument you pictured is not for MAF by the way. You take your antenna out and stuff it in the hole to measure IAS so you can calculate drag.
Update: The AIS is back in. Not sure when I’ll test it out but it is ready.
Took as much time talking myself into going into the attic to get it as it did to change out. Start to finish 13 minutes to remove 6637 and install AIS. And wasn’t really rushing. It’s getting pretty easy.
@KubotaOrange76 you were right about the rubber flap. When I first put it in the snorkel wanted to automatically flip the rubber in front of it a bit. Not sure how much of an impact to flow but it is something to keep and eye on while folks install these.
There are some ignorant 6637 haters out there who like to quote apples to oranges flow rates to ‘prove’ 6637 does not flow enough. Until now, the only measurement of restriction has been the FM.
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when seeing the gauge. 
