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Old 10-07-2007, 07:18 AM   #1
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Default 1.8 afm on a 1.6

hi everyone i want rid of the masive 1.6 mechanical air flow meter and replace it with a 1.8 item can this be done as the 1.6 has a couple more wires than the 1.8 at the minute im only using the hks piggy back ecu any help would be great
thansk malc
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Old 10-07-2007, 07:22 AM   #2
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Sell your HKS piggy, buy an MSPNP and delete the MAF altogether. If you want to upgrade, just switch to an Rx7 MAF.
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Old 10-07-2007, 07:51 AM   #3
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does the rx7 item just plug into mine
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Old 10-07-2007, 09:06 AM   #4
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yes it does to use the 1.8 item you need to invert the voltage signal buy a rx afm and be done with it.

Last edited by magnamx-5; 10-07-2007 at 10:49 AM.
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Old 10-07-2007, 09:11 AM   #5
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which rx7 is it from is it the twin turbo
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Old 10-07-2007, 09:13 AM   #6
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could someone be as kind as to post a pic up please
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Old 10-07-2007, 09:25 AM   #7
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sure here it is http://www.miata.net/solo/airflowmtr.html the original faq on this stuff. He is abit optimistic on the gains but it does have all the info.
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Old 10-07-2007, 10:47 AM   #8
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ok, now that the retards have had their say...
the 1.6 miata runs an AFM, the 1.8 miata runs a MAF. COMPLETELY different items that are not interchangable without extensive electrical knowledge and work.

put your afm back on the car and be done.
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Old 10-07-2007, 10:50 AM   #9
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Quote:
Originally Posted by magnamx-5 View Post
to use the 1.8 item you need to invert the voltage signal buy a rx afm and be done with it.
Uh ben ^
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Old 10-07-2007, 11:04 AM   #10
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yeah, you act like i can read what you write.
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Old 10-07-2007, 11:26 AM   #11
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Quote:
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...like i can read what you write.
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Old 10-07-2007, 01:37 PM   #12
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think everyone has got quite confused y i want to put a different air flow meter on my car the only reason is i think the standard unit looks **** i have a 1.8 maf sensor and am a mechanic so wiring it up isn't that much of a task aslong as it is possible the rx7 unit doesn't look much diffrent and doesn't save a great deal of room
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Old 10-07-2007, 01:54 PM   #13
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Quote:
Originally Posted by magnamx-5 View Post
Uh ben ^
Yeah, Ben, it's simple. Just buy a circuit board, an inexpensive RISC processor and a make sure it's got a couple of DACs, program it with Python/C++/your favorite language to convert the 0-5V signal to the inverted 0-4.5V signal the 1.6L ECU expects.

While you're at it, might as well write code for the RISC to handle EBC and ignition timing. Heck, if you find some drivers strong enough and make an aluminum case for the board that doubles as a heat-sink, you could drive your fuel injectors off off another proc. It wouldn't take that much time...

Richard, I'm surprised you haven't done this already...it's really a no-brainer.
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Old 10-07-2007, 01:55 PM   #14
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Well if you want to wire it up and invert the voltage then go for it. It should work just fine. My Miata performance handbook has diagrams on doing this it seems pretty simple.

And Ben i forgot you have me on Ignore don't you
Brian i wish i could do something that simple it might have been better than the aluminum case i have sitting by my stock ecu oh wait that is MS
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Old 10-07-2007, 02:02 PM   #15
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Unfortunately, it's not as simple as you think, Richard :(

BTW, here's an interesting page I ran across: http://howto.globalvicinity.com/gv_w...=120&co=1&vi=1
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Old 10-07-2007, 02:10 PM   #16
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That is exactly what i meant and i think what this guy is looking for. You don't post alot anymore brian but when you do it is very effective.
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Old 10-07-2007, 05:06 PM   #17
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Quote:
Originally Posted by magnamx-5 View Post
Well if you want to wire it up and invert the voltage then go for it. It should work just fine. My Miata performance handbook has diagrams on doing this it seems pretty simple.
any chance you can post up the wiring daigrams and items i need other than the maf sensor and the plug and wire so i can get it sorted

will you all stop digging at each other i only want to know how to do sumat not who doesn't like who
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Old 10-07-2007, 05:11 PM   #18
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dude, seriously
if you have to ask, it's well out of your league. don't feel bad about that; I think there's only 1 or 2 people here who could make it happen.

but the fact that you're a mechanic and can't tell the difference between an AFM and a hotwire MAF is pretty ****** scarry.
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Old 10-07-2007, 05:20 PM   #19
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Quote:
Originally Posted by Ben View Post
dude, seriously
if you have to ask, it's well out of your league. don't feel bad about that; I think there's only 1 or 2 people here who could make it happen.

but the fact that you're a mechanic and can't tell the difference between an AFM and a hotwire MAF is pretty ****** scarry.
look matey sum how i doubt it is out my leauge i do everything from mot's n service to ecu mapping i know wat im doing and if i put my mind to it could figure it out myself just thought that someone on here would of already had the same idea and of done the hard work so to speak

thanks for the help ill put a how too up in a couple of days to prove a point
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Old 10-07-2007, 05:29 PM   #20
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Quote:
Originally Posted by madmalc View Post
look matey sum how i doubt it is out my leauge i do everything from mot's n service to ecu mapping i know wat im doing and if i put my mind to it could figure it out myself just thought that someone on here would of already had the same idea and of done the hard work so to speak

thanks for the help ill put a how too up in a couple of days to prove a point
If i had a scanner i would scan the pic of the circiut baord they show in the book. But you will need 4.5 volts at WOT and .4 at idle. As far as i can tell there is no C+ mapping or code required this is a simple inversion of the voltage signal. I look forward to a how to though it should be interesting. This has also been used to run a map sensor in place of the AFM but that would prove abit harder.
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