Made a thing last weekend - Mazda CX3 Forum
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post #1 of 8 Old 09-28-2018, 03:27 PM Thread Starter
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Made a thing last weekend

DIY'ed an intake for my wife's cx-3 because of reasons.

https://www.cx3forum.com/forum/attac...1&d=1538148396
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post #2 of 8 Old 10-01-2018, 12:43 PM
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You fabricobbled a hot air intake?

Why?

I'd be curious for some data logs on MAF rate as a function of RPM and possibly IAT before and after the new intake. Unless you have some airflow smoothing device in the small space between the filter element and MAF sensor, the turbulent air can throw the MAF reading off (this is a common problem with all but two aftermarket intakes for the RX-8).


2016 CX-3 GT iAS AWD, Soul Red Metallic on black
2017 MX-5 RF Launch Edition
2005 RX-8 Sport Sunlight Silver under Cone Rash (because racecar!) -- SOLD!

Science adjusts it's views based on what's observed.
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Last edited by NotAPreppie; 10-01-2018 at 12:46 PM.
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post #3 of 8 Old 10-01-2018, 11:31 PM Thread Starter
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Quote:
Originally Posted by NotAPreppie View Post
You fabricobbled a hot air intake?

Why?

I'd be curious for some data logs on MAF rate as a function of RPM and possibly IAT before and after the new intake. Unless you have some airflow smoothing device in the small space between the filter element and MAF sensor, the turbulent air can throw the MAF reading off (this is a common problem with all but two aftermarket intakes for the RX-8).
I had enough left over pieces from the one i made for my Jeep. so i figured why not see if i can make one for the Mazda (with the wife's approval. it is her vehicle). It did throw a P0171 code after about 20 miles. Checked the short term fuel trim with my odbii scanner and found it was running positive while idling. Figured this was probably caused by turbulence so i added some fins before the MAF. See Pic.

https://www.cx3forum.com/forum/attac...=21695&thumb=1

That solved the problem.

My wife has put about 400 miles with the intake, in all sorts driving conditions, and no codes, no pending codes, and no permanent codes. She loves the growl the engine now has.

I only checked the IAT's once and it was running about 10 above ambient (73f ambient) at a speed of 30mph. Obviously that will be higher when not moving. I did leave the "scoop" portion of the OEM intake in place just to help funnel air in to that area, don't know if that actually helps or not.
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post #4 of 8 Old 10-01-2018, 11:34 PM Thread Starter
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@NotAPreppie I had enough left over pieces from the one i made for my Jeep. So I figured why not see if I can make one for the Mazda (with the wife's approval). It did throw a P0171 code after about 20 miles. Checked the short term fuel trim with my odbii scanner and found it was running positive while idling. Figured this was probably caused by turbulence so i added some fins before the MAF. See Pic.

https://www.cx3forum.com/forum/attac...=21697&thumb=1

That solved the problem. Have about 400 miles in all sorts driving conditions and no codes, no pending codes, and no permanent codes. The wife really loves the growl the engine now has.

I did check the IAT's once and it was running about 10f above ambient (73f ambient) at 30mph, with the new intake.
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Last edited by Josh Plahm; 10-01-2018 at 11:39 PM. Reason: Lousy grammar errors
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post #5 of 8 Old 10-02-2018, 12:01 PM
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Good deal on the fabricobbling and problem solving.

What are your IATs at non-moving idle? Just curious how easily it gets heat soaked.


2016 CX-3 GT iAS AWD, Soul Red Metallic on black
2017 MX-5 RF Launch Edition
2005 RX-8 Sport Sunlight Silver under Cone Rash (because racecar!) -- SOLD!

Science adjusts it's views based on what's observed.
Faith is the denial of observation so that belief can be preserved.
-Tim Minchin.
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post #6 of 8 Old 10-02-2018, 02:54 PM Thread Starter
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I can try and get those tonight.
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post #7 of 8 Old 10-07-2018, 05:48 PM Thread Starter
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@NotAPreppie Sorry this took a bit longer but I was finally able to get out and run some tests. The IAT at idle got to about 30F over ambient (74f ambient), which isn't too bad. It drops very quickly once you start moving. My OBDii Scanner (bluedriver) has a live logging but it is kinda hard to track while driving. The MAF and the RPM graphs followed very similar curves. If I can convince the wife to go bombing down the highway while I do this then I can get some screenshots.

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post #8 of 8 Old 10-08-2018, 01:30 AM
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Ah Ha! I found a link to help an old-school guy like me ...

Next, I'll try to figure out the effect of the OP's mods ... vs. all the sensors, processors, and their programmers :-)
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2017 CX-3 GT, AWD, i-ActiveSense, Ceramic Metallic, Black ... His: Zoom, Zoom!
2016 HR-V EX-L, AWD, Milano Red, Black ... Hers: Putt, Putt.
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