I have read a lot of opinions about the effectiveness of an aftermarket intake on mildly modd'ed ALH but didn't find any solid information. So, I decided to run a little test myself to see what the horsepower and torque numbers would be be with the factory intake vs a simulated high-flow intake (removed lid from airbox so there is no restriction). This test was done on the car in my signature.
What I found is that there is no real measurable difference in HP and TQ with the an open airbox vs the factory airbox. Run 8 was with the airbox lid closed like normal (170.54hp), and run 9 was with the airbox lid open (168.35hp). In my experience running a car/truck 3 times back to back on the dyno the 2nd run usually makes the most power and the first and third runs are a couple of hp lower. This would explain why the run with the lid open is a couple of hp less.
One interesting observation is that the run with the lid open had much less smoke than with the lid closed.....
Dyno graph:
http://i1316.photobucket.com/albums/t616/mike_d/Jetta%20intak%20dyno_zpsuxjdyk01.jpg
Dyno run of lid closed:
https://www.youtube.com/watch?v=QMxvscACWQU
Dyno Run of lid open:
https://www.youtube.com/watch?v=QMxvscACWQU
What I found is that there is no real measurable difference in HP and TQ with the an open airbox vs the factory airbox. Run 8 was with the airbox lid closed like normal (170.54hp), and run 9 was with the airbox lid open (168.35hp). In my experience running a car/truck 3 times back to back on the dyno the 2nd run usually makes the most power and the first and third runs are a couple of hp lower. This would explain why the run with the lid open is a couple of hp less.
One interesting observation is that the run with the lid open had much less smoke than with the lid closed.....
Dyno graph:
http://i1316.photobucket.com/albums/t616/mike_d/Jetta%20intak%20dyno_zpsuxjdyk01.jpg
Dyno run of lid closed:
https://www.youtube.com/watch?v=QMxvscACWQU
Dyno Run of lid open:
https://www.youtube.com/watch?v=QMxvscACWQU
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