Nicks homemade AFC
12-04-2003, 07:20 PM
#1
3.0 BAR
Thread Starter
Join Date: Jan 2003
Posts: 1,798
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
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
12-09-2003, 03:53 AM
#2
0.5 BAR
Join Date: May 2003
Posts: 127
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
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
12-09-2003, 09:06 AM
#4
3.0 BAR
Join Date: Apr 2003
Posts: 2,260
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.
http://www.carolinahondas.com/forums...lerpark+budget
Joseph to the rescue.
12-09-2003, 09:28 AM
#5
1.0 BAR
Join Date: Jul 2003
Posts: 361
Re:Nicks homemade AFC
12-09-2003, 09:43 AM
#6
3.0 BAR
Join Date: Apr 2003
Posts: 2,260
Re:Nicks homemade AFC
Originally Posted by bikerchris13
The home of PGMFI is.. http://www.pgmfi.org
