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> New 'Hobby' Project, carb tuning gone high tech
McMark
post Oct 15 2013, 10:39 PM
Post #41


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EDIT: I know about tube-and-water setups. You can't drive with those. I'm building some different.

I've been pondering this project for awhile, and now I'm finally getting ready to start. Every time I synch carbs I think about how terrible and approximate the process is. What I'm going to try is using a small, programmable computer called an Arduino. There are add-ons called Shields to expand the functionality, and I'm using a LCD screen shield. I'm going to hook up 4 to 6 MAP sensors to the Arduino and output their readings on the screen. Using this tool, I'll be able to numerically evaluate the relative balance of the carb throats.

One possible shortcoming is that the intake pulses may create fluctuating values that are difficult to interpret. Although, I have some ideas that may deal with this. Some sort of averaging could help. (IMG:style_emoticons/default/idea.gif)

Here's what the Arduino looks like (this is the Uno version)
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.adafruit.com-419-1381898348.1.jpg)

Here's the screen shield
(IMG:http://www.914world.com/bbs2/uploads_offsite/www.adafruit.com-419-1381898349.2.jpg)

Here's the MAP sensors I'm going to start with.
(IMG:http://www.914world.com/bbs2/uploads_offsite/thumbs4.ebaystatic.com-419-1381898350.3.jpg)

I'm also probably going to have to make some plates that will go between the carb and manifold with a vacuum port on it. This would be the easiest way to access manifold vacuum since I can't count on carbs to have vacuum ports. Oh, and this will also be useable while driving to evaluate dynamic synch.
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McMark   New 'Hobby' Project   Oct 15 2013, 10:39 PM
stugray   If you are interested in Arduino, checkout sparkfu...   Oct 15 2013, 10:44 PM
euro911   So, is this like a CAT scan for carbs? :lol:   Oct 15 2013, 10:56 PM
McMark   :rotfl:   Oct 15 2013, 11:26 PM
rick 918-S   Sound is how I used to tune my triple Holley's...   Oct 16 2013, 12:13 AM
pcar916   Sound is how I used to tune my triple Holley...   Oct 16 2013, 06:24 AM
914forme   I'm also probably going to have to make some...   Oct 16 2013, 07:50 AM
jsconst   Sounds like a good idea, Surprised nothing like th...   Oct 16 2013, 07:51 AM
Matt Romanowski   Why do you feel the regular methods are not accura...   Oct 16 2013, 09:12 AM
jaxdream   I say go for it !!! You seem to be alw...   Oct 16 2013, 11:01 AM
SirAndy   Some sort of averaging could help. :idea: If you...   Oct 16 2013, 11:23 AM
McMark   This will be interesting to see if you can get all...   Oct 16 2013, 12:14 PM
OU8AVW   Your set up is real nice, but I'm way ahead of...   Oct 16 2013, 02:08 PM
Harpo   Nice and I'm not even in the sand box!   Oct 16 2013, 03:19 PM
bfrymire   This looks like fun. Couple of comments. I think...   Oct 16 2013, 07:40 PM
kg6dxn   This looks like fun. Couple of comments. I thin...   Oct 16 2013, 10:04 PM
stugray   You dont need to overthink this one. Since these ...   Oct 16 2013, 11:52 PM
McMark   They don't lose signal. They only drop to ...   Oct 17 2013, 01:59 PM
McMark   Started working on this project this weekend. Got...   Nov 16 2013, 11:28 PM
gothspeed   Started working on this project this weekend. Go...   Nov 17 2013, 02:41 PM
bulitt   Another alternative -purchase a used flow bench (s...   Nov 17 2013, 07:53 AM
ww914   I love gauges. The more the merrier, but I m runni...   Nov 17 2013, 09:00 AM
gothspeed   I love gauges. The more the merrier, but I m runn...   Nov 17 2013, 10:37 PM
ww914   No they are aircraft cylinder head temps gauges wi...   Nov 19 2013, 08:24 AM
McMark   :headbang: I can't believe I'm still gett...   Nov 17 2013, 10:33 AM
ConeDodger   :headbang: I can't believe I'm still get...   Nov 17 2013, 12:14 PM
SirAndy   I can't believe I'm still getting the ...   Nov 17 2013, 12:48 PM
euro911   Stick to your guns, Mark :headbanger:   Nov 17 2013, 11:57 AM
02loftsmoor   I used Mercury Sticks to balance my Motor cycle ca...   Nov 17 2013, 08:11 PM
r_towle   Cool project. To bad the sensors are so large... W...   Nov 17 2013, 10:00 PM
ConeDodger   Cool project. To bad the sensors are so large... ...   Nov 17 2013, 10:29 PM
McMark   Cool project. To bad the sensors are so large... ...   Nov 17 2013, 11:15 PM
AE354803   Cool project. To bad the sensors are so large......   Feb 10 2014, 11:44 AM
Dave_Darling   I'm still really liking Mike B's idea of u...   Nov 17 2013, 10:33 PM
Andyrew   That is awesome! Would be great for bikes... H...   Nov 17 2013, 11:15 PM
r_towle   Can you use an airflow sensor for what you are doi...   Nov 18 2013, 07:34 PM
Spoke   Looks pretty cool. We've used Arduino for sev...   Nov 18 2013, 09:37 PM
stugray   Mark, I thought about another excellent use for y...   Feb 9 2014, 01:03 PM
jfort   interesting. and I had as a winter project an atte...   Feb 10 2014, 12:22 PM
McMark   Haven't had a carb'd car in to do any more...   Feb 10 2014, 03:52 PM
Dr Evil   Liking this a lot :) :popcorn: I am with the MAF...   Feb 10 2014, 10:44 PM
bulitt   I agree, this Arduino stuff is a cool concept. Rea...   Feb 11 2014, 08:34 AM
McMark   I agree, this Arduino stuff is a cool concept. Re...   Feb 11 2014, 10:19 AM
ClayPerrine   [quote name='bulitt' post='1996414' date='Feb 11 ...   Feb 11 2014, 10:29 AM
bulitt   [quote name='bulitt' post='1996414' date='Feb 11...   Feb 11 2014, 10:58 AM
biosurfer1   I really need a daily driver with carbs on it to ...   Feb 11 2014, 09:36 AM
McMark   Brett, sounds like a good plan. I'll get two ...   Feb 11 2014, 10:17 AM
Dr Evil   Junk yard MAF not an option? I bet you find 4-6 of...   Feb 11 2014, 10:40 AM
McMark   Not for me. At least at this time. I've pick...   Feb 11 2014, 10:50 AM
Dr Evil   Not for me. At least at this time. I've pic...   Feb 11 2014, 12:02 PM
Dr Evil   You really should try a manometer. It is a board w...   Feb 11 2014, 12:06 PM
ClayPerrine   You really should try a manometer. It is a board ...   Feb 11 2014, 02:13 PM
bulitt   Tubes! and Water! :trophy: :lol4:   Feb 11 2014, 02:18 PM
McMark   You need to read post #1 again. Really hard to dr...   Feb 11 2014, 10:27 PM
'73-914kid   I'm not sure why the scope of this project is...   Feb 11 2014, 10:38 PM
stugray   McMark, I got one of the Denso "79800-3280...   Sep 23 2014, 10:06 AM
Sleepin   McMark, The value changes when I blow/suck on th...   Sep 23 2014, 01:49 PM


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