Air flow test (drop-ins)
 

After a ton of reading all the CIA vs Drop-in threads and reading all the info on drop-ins with MAF tubes. I decided to do my own test on K&N drop-ins and Z1 MAF tubes to see if they increase air flow vs. the OEM filters and air tubes.

I bought a PLX Kiwi that I've been playing around with so I thought I would put it to good use. Using the Dash Command app I can get MAP (mass air pressure) measured in kPa and MAF (mass air flow) measured in lb/min.

I started the baseline test with stock OEM filter and air intakes, took a screen shot at idle, ~4000 rpm (not moving), ~5000 rpm in 2nd gear and again ~5000 rpm in 3rd. These are my numbers, in order from top to bottom.

https://farm3.staticflickr.com/2899/...97426d16_c.jpg

I'll repeat the same with K&N filters installed and then again when I install the Z1 MAF tubes.

Very interesting. Let us know the results with the drop-ins and Z1 post-MAF tubes installed. It will be interesting to compare the findings.

In for results....

+1 :)

Nicely done, and looking forward to results.

Although, note that you may see greater differences in voltage readings under load (and certainly if moving) then just revving while stationary.

I put in the K&N filters and ran my test.
http://img.tapatalk.com/d/14/06/15/e7y6ygyp.jpg
I was really surprised with the numbers, so much so that I put the OEM filter back in and ran the test again.
http://img.tapatalk.com/d/14/06/15/y8unagug.jpg
Kinda confirmed the K&N numbers.

I think this needs more testing and another person to take the screen shots (so I'm not doing it while driving) to try to be a little more accurate. I think I also want some cruising numbers at about 80mph in 6th.


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I've got dash command and JWT CAI (short tubes). I'll run the test tonight on the way home for some comparison numbers.

Be advised I'm in denver so air is thin...

Hmmm … even more interesting. Keep us posted. It would be interesting to see the results with the Z1 silicone tubes installed, regardless of the filter type.

Doing it on the same road and stretch? Engine load plays into this. 5k up a hill has huge numbers vs 5k going down a hill. You need 100% same conditions too. A gust of wind increase load on the car. This isn't a great test. You need to bench flow test the whole intake plan and simple.

Your exactly right, and I'm trying to the same each time, yet it's far from perfect. Just having some fun playing more than anything.


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Yes not very scientific as I will not be putting stock stuff back in for comparison but I'll throw up some numbers anyhow just for fun.

I would try and do a sweep on a dyno to keep things close and under constant load -- heated IAT's will play a role as well as load, and should be recorded too.

Intake temps so far have been pretty consistent, between 100-110. I let the cold start warm up to 100 before starting the test.


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This is cool! I'd like to see the difference between stock,post mafs with drop ins, short ram and cold air setups as well.

Okay...I admit, I don't know what these numbers mean. Bottom line, the drop in better than OEM?

370z Dyno with Z1 PowerMod : Fast Intentions TDX + HFC - YouTube

You can still make power with MAF tubes + Drop ins, here is a dyno to prove it. I will be doing the same modifications, except I will also be getting the Z1 headers and test pipes instead of HFCs. I'm confident I can achieve 330whp!

dont cheat. SAE or nothing :tup:

There is a dyno sheet here from a member showing the gains from the drop ins alone. They make 5hp and then 1hp extra with the MAF tubes.

They added an axle back and combined got a peak hp gain of 9.5hp total for the drop ins, MAF tubes and axleback.

And then you need a tune to make an additional 12whp.:happydance:

That's all it takes for 305 ish whp.

2013 Nissan 370z dyno run - YouTube

For those who don't believe in tune + exhaust and maf tubes = 300whp

There's a lot of variance across runs... I think try and figure out a way to get consistent conditions for 10-20 sweeps for each set up, then report the means and SD's. Even then it may be inconclusive, but at least a lot of the random variance will be accounted for...

We had a corporate environmental guy in the office yesterday doing some sound studies and I showed him my air flow numbers and he agreed with the finding. When sucking air when the air flow increases the numbers will lower. The filters are not restricting so that allows the air to flow more freely therefore having less pressure. He said if you were pushing the air, then the numbers would be opposite.


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Ohhhh so those numbers correspond to pressure drop/resistance to flow? Then that makes sense -- I had misunderstood them.

Is that also the case for lb/min?

Can you read voltage?

I would assume it is. Since the measurements are taken at the same point, less pressure = less lb/min but that means that the K&N filter allow for a lot more air flow.


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