pilchardthecat's MAF screen mod

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original guvnor
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Re: pilchardthecat's MAF screen mod

Post by original guvnor » Mon Jun 03, 2013 6:26 pm

My dyno (posted on another thread last week) didn't show a dip at 7200 but it had levelled off noticeably. Unfortunately I don't know whether it would've then stepped up again at 7600 because they chap doing it wouldn't take it above 7400.

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Re: pilchardthecat's MAF screen mod

Post by Shooter » Tue Jun 04, 2013 2:15 pm

This is all getting very, very interesting !
Keep up all the good work folks !
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Re: pilchardthecat's MAF screen mod

Post by exdos » Mon Jun 17, 2013 6:45 pm

I've now received the honeycomb screen and fitted it into a spare air-filter box lid so I'll get around to data-logging this mod soon. :thumbsup:

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Re: pilchardthecat's MAF screen mod

Post by AlienZed » Tue Jun 18, 2013 5:06 pm

Rec mine and fitted it . been out for my usual run. 60mls mixed driving seems to be a bit flat on low revs 2000 ish but above 3000. Seems better ? Fuel consumption marginally better.or at least no worse.+ car is decatted.
Would taking the stuffing out of the back box do anything apart from more noise:grin: 3.0 se.
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Re: pilchardthecat's MAF screen mod

Post by Bigpow » Tue Jun 18, 2013 9:08 pm

Gar try it out and make two lol
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Re: pilchardthecat's MAF screen mod

Post by exdos » Thu Jun 20, 2013 3:04 pm

I did some datalogging of the Honeycomb MAF screen mod versus the OEM MAF screen in my Z4MC this morning.

The best way to assess any changes which might occur from modding the air-intake system is by datalogging the parameter of "Airflow through the MAF", because the more efficient the air-intake, the greater the airflow through the MAF to which the appropriate amount of fuel can be added by the ECU. When my Z4MC was completely OEM when I first bought it, the maximum airflow through the MAF in 3rd gear at an ambient temperature of 5degs C was 31.2lbs/min.

After doing several air intake mods and gutting the silencers I've managed to get the maximum airflow through the MAF in 3rd gear at an ambient temperature of 2degs C to 34.5lbs/min this represents an increase in airflow of 10.57%.

So, I did a couple of accelerations with my Z4MC in opposite directions on the same test track with all my existing mods and immediately afterwards I parked up and then removed the OEM MAF screen from my OEM air-filter box and swapped it for the Honeycomb MAF screen. It took about 5 minutes to swap the screens and then I got back in the car and did the same test again. The ambient temperature was 21 degsC and the humidity was 73%. It was relatively windless.

Here are the graphs of the OEM v Honeycomb runs.

Image


Image


The maximum Airflow through the MAF when I was running the OEM MAF screen was 32.49 lbs/min (this is lower than my previous figure of 34.5lbs/min because the temperature was 18 degs C higher today, which reduces the air density). The maximum Airflow through the MAF when I was running the Honeycomb MAF screen was 35.93lbs/min: this represents an increase of 10.58% above what my modified intake/exhaust set-up was producing under the same conditions. :D 8) This mod definitely works! :thumbsup:

From researching the honeycomb screens I see that this mod has been round for over 10 years for the Corvette see: http://www.southerncarparts.com/Inst/MAFscreen.pdf. Big thanks to pilchardthecat for bringing it to our attention. :thumbsup: :thumbsup: :thumbsup:

I shall analyse the data some more and produce some more information from it.

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Re: pilchardthecat's MAF screen mod

Post by Beedub » Thu Jun 20, 2013 4:07 pm

well done pilchard !!!!!!!
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Re: pilchardthecat's MAF screen mod

Post by exdos » Thu Jun 20, 2013 6:02 pm

Below is the raw data from the datalogging.

The 4 data samples on the left are when the car was OEM, and the 4 samples on the right are when the car had the Honeycomb MAF screen. The top two samples both OEM and Honeycomb, were when the car was travelling South on the same track and the bottom two samples were when the car was travelling North on the same track; therefore the data has been presented so that it is comparable, when viewing horizontally.

I've used the "time stamps" for the datalogs and the engine rpm to calculate "engine acceleration". For example, using the top left sample; it takes from 40.846secs to 45.387 secs for the engine to accelerate from 2125rpm to 7499rpm (= total 5374 rpm increase), and this represents an engine acceleration rate of 1183.43977 revs/sec during that sampling period.

From comparing the engine acceleration of the OEM MAF screen against the Honeycomb MAF screen, there doesn't seem to be much difference in engine performance between OEM and Honeycomb MAF screens despite there being a very significant difference in airflow through the MAF with the Honeycomb MAF screen. Bearing in mind that I did the test runs immediately after swapping the MAF screens, without resetting the ECU or allowing any time for the ECU to make its own adaptations to a greater airflow, it's possible that this may produce the increase in performance that an increase in airflow potentially provides. I will datalog the car again after doing some more miles to see if there's any adaptation improvement. I suspect that the fuelling was a little "conservative" with the increased airflow through the honeycomb MAF screen. We shall see.


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Re: pilchardthecat's MAF screen mod

Post by daz05 » Thu Jun 20, 2013 9:56 pm

Pretty cool and well done you have accreditation from the oracle. :thumbsup:

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Re: pilchardthecat's MAF screen mod

Post by pilchardthecat » Fri Jun 21, 2013 10:32 am

I have no idea what any performance benefit might be, although i suppose in principle the aught to be one.... but either way it's nice to see the flow improvement confirmed
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Re: pilchardthecat's MAF screen mod

Post by exdos » Fri Jun 21, 2013 11:04 am

I've done an enlarged graphical representation showing the comparison of airflow (blue line OEM, green line Honeycomb) and Engine rpm (red lines) when with OEM MAF screen and with Honeycomb MAF screen, as below. I think that this shows beyond doubt that the Honeycomb MAF screen provides a much better airflow (and more of it). It also makes the engine acceleration smoother too, right up to the redline. :thumbsup:

I just need to do some more datalogging to see how this might provide any tangible performance gain with my car (and all its intake/exhaust mods).


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Re: pilchardthecat's MAF screen mod

Post by pilchardthecat » Fri Jun 21, 2013 11:12 am

exdos wrote:I've done an enlarged graphical representation showing the comparison of airflow (blue line OEM, green line Honeycomb) and Engine rpm (red lines) when with OEM MAF screen and with Honeycomb MAF screen, as below. I think that this shows beyond doubt that the Honeycomb MAF screen provides a much better airflow (and more of it). It also makes the engine acceleration smoother too, right up to the redline. :thumbsup:

I just need to do some more datalogging to see how this might provide any tangible performance gain with my car (and all its intake/exhaust mods).


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Thanks - i really appreciate those graphs :) it's very much representative of my smoke tests and theory - much more solid laminar flow, less turbulence = better MAF signal.
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Re: pilchardthecat's MAF screen mod

Post by AlienZed » Fri Jun 21, 2013 12:10 pm

You two guys are amazin(exedos,pilchard t.c. )keep up the good work .Installed the honeycombe at first it seemed flat/hesitant lowdown.but had a 300ml cruz on wed .and now seems to have settled down and seems to better at higher revs 4000+.Pleased to say fuel consumption hasnt suffered.
I assume the maf learns and adjusts to changes .
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Re: pilchardthecat's MAF screen mod

Post by tombar » Fri Jun 21, 2013 2:00 pm

also , I would like to say thanks both to pilchardthecat and exdos ... I will look into both mods when I get time ... Big Thanks for sharing your knowledge.

exdos ... the engine rev graph with the honeycomb is much steeper on the time axis ... i guess the engine will rev much faster = better acceleration ... was this data logging done in real world conditions??? (of course on a closed road :wink: )
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Re: pilchardthecat's MAF screen mod

Post by exdos » Fri Jun 21, 2013 2:16 pm

tombar wrote:
exdos ... the engine rev graph with the honeycomb is much steeper on the time axis ... i guess the engine will rev much faster = better acceleration ... was this data logging done in real world conditions?
Don't read anything into the steepness of the graphs because the 2 graphs are slightly different scales because I didn't stretch the graph images identically, I simply wanted to demonstrate the relatively smoother data points from the ECU with the honeycomb MAF screen due to the laminar flow characteristics. All my datalogging is done in real world conditions: I am no fan of static dynos.

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