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Old 03-10-2010, 06:30 PM
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Using a labtop to tune engine

Whats up everyone?
I completely rebuilt a sb chevy 350 about a year or so ago and dropped it in a '81 El Camino. I have not put it on the road yet.
It has the following:
750 carb with vac. sec.
-RPM air gap manifold
-milldly ported 1.94 intake/150 exhaust iron heads, casting number 461
-Harland Sharp roller rockers
-9.9:1 compression
-6 inch rods
-scat crank
-Crower Solid cam with .493 intake lift, and .503 exhaust lift
I am looking to eventually get a hydraulic roller cam and better heads. Anyway, my question is the following;

Is their a software package that I can basically install on my labtop computer that also comes with hardware to hook up to my engine so that I see how my engine is running. I am not a professional racer, but I would like to use every available tool to see if the engine is running rich or lean, and if my ignition timing is right etc.
A couple of things to keep in mind are; I do not have a connector under the steering column for the standard OBD-2 hook-up, nor do I have an ECM on the car. We are talking just the engine, transmission, and rear.

Any suggestions or recommendations are very much appreciated.

Thanks,
Rob

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Old 03-10-2010, 08:05 PM
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Are you gonna ask this question till you get the answers you want?

look at this link.

http://www.airfuelmeter.com/english/

with a carb, vac. advance, etc, there just isn't that much to monitor.

If you can't check your air/fuel mixture with conventional methods, then by all means buy a wideband O2 sensor and some ridiculous software to monitor it for you.


BTW, is a labtop computer one you have strapped to your dog?
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Old 03-11-2010, 03:57 AM
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Moderator suggested posting this question in garage and tools not engine forum. Thanks for your input.
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Old 03-11-2010, 07:06 AM
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Moderator sez "never mind the peanut gallery" Try one of these as this monitors mixture in real time..:

http://www.rbracing-rsr.com/rsrgauge.htm

Get the dual output and place a probe on each bank so you can tell if one bank or the other is lean or rich..one probe can give a good indication though..

here is another item which may be of use to you:

http://performancetrends.com/road_race_DataMite.htm

this is a data logger that tells you how the car is performing on the track..might be a bit of overkill for a street guy..

Couple of more ideas for you..

Sam
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Old 03-11-2010, 11:32 AM
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With just a carburetor and no computer using a laptop would be just a high tech way of approaching a low tech job. I guess there would be software available but again without an ECM it would do nothing more than allow you to check various parameters which could be done easier, and a heck of a lot more cheaply, using conventional test equipment. By the time you buy software, cables, etc, will have spent enough to have bought a good DVOM, timing light, etc that could be used for other purposes but of course they would not have the "wow" factor. A wideband O2 sensor, a vacuum gauge, DVOM and a good timing light should be about all you need to precisely tune that carburetor setup.
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