New 'Hobby' Project, carb tuning gone high tech Options

[Dr Evil]

Liking this a lot (IMG:style_emoticons/default/smile.gif) (IMG:style_emoticons/default/popcorn[1].gif)

I am with the MAF idea. Place on the stacks, cut to fit length.

[bulitt]

I agree, this Arduino stuff is a cool concept.
Read where some MAF's output acceptable voltage for the Arduino.

I understand your quest to learn and build a tuning tool, for the rest of us not so technically gifted-
How about an airflow anemometer (@ 48$ on Ebay). Slip it over the carb somehow. It reads air velocity, but more importantly CFM.

(IMG:http://www.914world.com/bbs2/uploads_offsite/thumbs4.ebaystatic.com-13632-1392129288.1.jpg)

[biosurfer1]

I really need a daily driver with carbs on it to really test this out.

I'd love for you to use my car as much as you'd like to test this out. I'm pretty sure my carb's are way out of whack anyways.

[McMark]

Brett, sounds like a good plan. I'll get two more sensors set up and then get in touch. Then you can come down and we'll install it semi-permanently. Do some testing and then you can keep it in your car and we'll upgrade the code over time.

It's not doing any good here on my desk. (IMG:style_emoticons/default/wink.gif)

[McMark]

I agree, this Arduino stuff is a cool concept.
Read where some MAF's output acceptable voltage for the Arduino.

I understand your quest to learn and build a tuning tool, for the rest of us not so technically gifted-
How about an airflow anemometer (@ 48$ on Ebay). Slip it over the carb somehow. It reads air velocity, but more importantly CFM.

(IMG:http://www.914world.com/bbs2/uploads_offsite/thumbs4.ebaystatic.com-13632-1392129288.1.jpg)

It might work. Only one way to find out. (IMG:style_emoticons/default/wink.gif)
This CFM reading is essentially what the 'snail' Synchrometer does, so it should work just fine and your idea will give you a numeric reading whereas the Synchrometer is much more ambiguous.

[ClayPerrine]

I agree, this Arduino stuff is a cool concept.
Read where some MAF's output acceptable voltage for the Arduino.

I understand your quest to learn and build a tuning tool, for the rest of us not so technically gifted-
How about an airflow anemometer (@ 48$ on Ebay). Slip it over the carb somehow. It reads air velocity, but more importantly CFM.

(IMG:http://www.914world.com/bbs2/uploads_offsite/thumbs4.ebaystatic.com-13632-1392129288.1.jpg)

It might work. Only one way to find out. (IMG:style_emoticons/default/wink.gif)
This CFM reading is essentially what the 'snail' Synchrometer does, so it should work just fine and your idea will give you a numeric reading whereas the Synchrometer is much more ambiguous.

One problem with that...... the reversion caused by a big, lumpy cam will cause backflow pulses. And that will foul up a fan type anemometer the same way a big cam fouls up L-jet injection. You need a hot wire type anemometer. and those are about 500 bucks.

[Dr Evil]

Junk yard MAF not an option? I bet you find 4-6 of the same model and get them for about $30 ea

[McMark]

Not for me. At least at this time. I've picked my path and I'm gonna see it through until I get something I consider a working setup. Then I may move on to MAF. But MAP is so much easier to set up in the car and I can't imagine how to make a MAF setup that even comes close to that simplicity.

Although, maybe if I built the MAF into a package that would bolt onto the top of the carbs in place of an air cleaner... (IMG:style_emoticons/default/idea.gif)

[bulitt]

I agree, this Arduino stuff is a cool concept.
Read where some MAF's output acceptable voltage for the Arduino.

I understand your quest to learn and build a tuning tool, for the rest of us not so technically gifted-
How about an airflow anemometer (@ 48$ on Ebay). Slip it over the carb somehow. It reads air velocity, but more importantly CFM.

(IMG:http://www.914world.com/bbs2/uploads_offsite/thumbs4.ebaystatic.com-13632-1392129288.1.jpg)

It might work. Only one way to find out. (IMG:style_emoticons/default/wink.gif)
This CFM reading is essentially what the 'snail' Synchrometer does, so it should work just fine and your idea will give you a numeric reading whereas the Synchrometer is much more ambiguous.

One problem with that...... the reversion caused by a big, lumpy cam will cause backflow pulses. And that will foul up a fan type anemometer the same way a big cam fouls up L-jet injection. You need a hot wire type anemometer. and those are about 500 bucks.

I think I read these units take an "average" measurement so possibly the lumps would be smoothed out? Possibly inserting it into a pvc pipe about 18" from the carb may help ???

Now I am seeing "hot wire probe anemometers" on Ebay @230$ (IMG:style_emoticons/default/idea.gif)

[Dr Evil]

Not for me. At least at this time. I've picked my path and I'm gonna see it through until I get something I consider a working setup. Then I may move on to MAF. But MAP is so much easier to set up in the car and I can't imagine how to make a MAF setup that even comes close to that simplicity.

Although, maybe if I built the MAF into a package that would bolt onto the top of the carbs in place of an air cleaner... (IMG:style_emoticons/default/idea.gif)

That is what I envision. Either on tubes angles centrally from the carbs, or just sticking straight up on shorter stacks. I typed MAF and Bosche into ebay and found some deals among the new parts that are much more. I do respect the MAP approach as it is cheaper and stupid simple.

[Dr Evil]

You really should try a manometer. It is a board with tubes full of fluid that you hook up to the cards (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/confused24.gif)

[ClayPerrine]

You really should try a manometer. It is a board with tubes full of fluid that you hook up to the cards (IMG:style_emoticons/default/poke.gif) (IMG:style_emoticons/default/confused24.gif)

(IMG:style_emoticons/default/agree.gif)

Or just buy 4/6 vacuum gauges at your FLAPS, mount them to a board, and put logn tubes on them.


KISS - Keep It Simple, Stupid.

[bulitt]

Tubes! and Water! (IMG:style_emoticons/default/smilie_pokal.gif)

(IMG:style_emoticons/default/lol-2.gif)

[McMark]

You need to read post #1 again. Really hard to drive down the road with a board and tubes of water on the back. (IMG:style_emoticons/default/rolleyes.gif)

I'm not sure why the scope of this project is so hard to grasp. (IMG:style_emoticons/default/tongue.gif)
(IMG:style_emoticons/default/poke.gif)

['73-914kid]

I'm not sure why the scope of this project is so hard to grasp. (IMG:style_emoticons/default/tongue.gif)
(IMG:style_emoticons/default/poke.gif)

Because it involves computers.... black magic... (IMG:style_emoticons/default/av-943.gif)

[stugray]

McMark,

I got one of the Denso "79800-3280" MAP sensors.

I power it with 5 Volts and at atmospheric pressure I am reading 2.5-2.7 Volts.
The value changes when I blow/suck on the input port, but not as much as I would expect.

What voltage values were you reading under load?

[Sleepin]

McMark,

The value changes when I blow/suck on the input port, but not as much as I would expect.

(IMG:style_emoticons/default/av-943.gif)


Looks like a cool project Mark! I am looking forward to seeing it completed!