Nicks homemade AFC
Well this is my thread starter. I will continue to update this post as my progress goes along.
So far I got the hardware setup all the tools and chips needed, now its time to figure out how the map sensors. I'm having a slight problem generating over 4v, depending on the range of the map sensor this could be a big issue. If anyone has info on the map sensor such as the which wire is ground,+5,output line and what is the range of the sensor, it would help. Nick |
Re:Nicks homemade AFC
Sorry to burst yr bubble.. but what you're planning to do is not that easy.
I tried myself, and these are the issues I got: First.. how I did it.. get input MAP sensor signal, lower voltage by some percent, possible to lower by percent variable to some preset voltage (like 0.3V). Now... first you need to know how MAP sensor works. At idle, it reads near 0.9V, at WOT (or when it reads atmosferic pressure), it's near 3V. I used Honda Prelude injectors for my install (310cc). The issues I had... first, it idles without problem, accelerated smooth. But, when letting of throttle, MAP sensor should read even lower values (not lower than 0.2V or you'll get a CEL) - and after letting go of throttle, and pressing it again I'd get a backfire. Also, another issue was if driving in for example 2nd gear and just keeping very low throttle just to keep speed at some 4krpm - it would sputter - this is because at that speed/throttle vacuum is pretty high (lower MAP voltage).. These were the issues I had with my 'homemade AFC'. It was a nice school though :) |
Re:Nicks homemade AFC
But doesn't Honda map sensor not read 5 volt at atmospheric pressure?
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Re:Nicks homemade AFC
Sorry to burst everyone's bubble, but this has already been done cheap and successfully.
http://www.carolinahondas.com/forums...lerpark+budget Joseph to the rescue. :D |
Re:Nicks homemade AFC
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Re:Nicks homemade AFC
Originally Posted by bikerchris13
The home of PGMFI is.. http://www.pgmfi.org ::) |
Re:Nicks homemade AFC
i figured but there was a link on that carolina hondas page that went there and I thought it was kinda funny what came up
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Re:Nicks homemade AFC
No, Honda's MAP sensor reads near 3V for atmospheric pressure. At 10-11PSI (or near maximum that Honda's MAP sensor can handle) it reads 5V.
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Re:Nicks homemade AFC
Has anyone ever built one of these? like the link above. does it work and how good. just might have to build one instead of using a fmu. if that fails buy SMC 500 since i will have the injectors.
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Re:Nicks homemade AFC
Yes, XDEep has built one, it runs fine.
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Re:Nicks homemade AFC
Originally Posted by TurboCiv
Has anyone ever built one of these? like the link above. does it work and how good. just might have to build one instead of using a fmu. if that fails buy SMC 500 since i will have the injectors.
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Re:Nicks homemade AFC
well I went out to radio shack and picked up everything I need for this other than the 5k ohm potentiometer, they didn't have one that goes on a circuit board, they had one that has 3 loops for the ends rather than pegs and it was bigger than the peg legged ones, can I use the big one or do I have to find something else?
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Re:Nicks homemade AFC
if you build it please post how well it works. is the part that radio shack has, it has 3 legs comming off a knob you turn right? just solder wires on to those, then to the board.
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Re:Nicks homemade AFC
i forgot if it is the same value it will work. it would make it nicer for mounting and tunning. so if it works that would save me some money thats what hmt is all about
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Re:Nicks homemade AFC
I'm only making it to practice soldering on pc boards for when I put together a batronix 3.3, I'm not boosted anyways so I won't really be able to tell you how well it works. I'll try to find my camera to take more picts, but it's in storage so you probably won't get picts until next year, but they'll be good ones, more detailed then the ones on the link above.
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