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Old 01-03-2002, 12:12 PM   #1
Sophocles
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Default "Street Dyno"

I am not sure if this is the most appropriate forum for this question.


Has anyone used any DIY dynos such as:

http://www.tweecer.com/StreetDyno/index.html

http://www.charm.net/~mchaney/homedyno/dynokit.htm ?
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Old 01-03-2002, 12:19 PM   #2
Jon Bogert
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Do a search on Road Dyno. A few people have made it work well, but it requires tweaks.

That Street Dyno thing looks like a joke! Extrapolating power curves from an audio recording of your engine?
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Old 01-03-2002, 12:51 PM   #3
JNaubur
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Actually it does sound out there, but I believe that it can work. Why? Because some of the bigger Formula 1 teams are developing similar systems to spy on the competing teams. I saw an interview with a professor from some US university who had been testing it for a while. He showed that by comparing sound recordings he could tell things like RPM, HP, even who was driving (provided you have a previous recording of that driver to compare it too). It is quite sophisticated which is why only the bigger teams are R&D'ing it. I have not seen the dyno mentioned above, but theoretically it should work.

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Old 01-04-2002, 01:59 PM   #4
jlw
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WRXfx@Psi-Fi apparently uses Road Dyno & has gotten similar results with a drum dyno. I have been searching through i-club for Road Dyno (road AND dyno, road dyno, etc.) & end up with 100s of worthless threads. You can't find the forest for trees in here.

road dyno seems like a pretty good idea. Their web site has plenty info on usage & at $149 is not much of a gamble. I am thinking about getting one. Heck I bought a car code scanner for about half that which is just a cable ... and s/w.

BTW thanks for the other link. Makes for an interesting read.

Acoustic analysis is applied to many areas. Railroads use it to determine wheel bearing life. It is used to determine structural failures, i.e. where did the plane start to fall apart? Didn't mechanics once-upon-a-time use stethoscopes on engines ... or is that an old mechanics tail? Except for sensitivity & ambient noise, it doesn't make that much difference whether direct contact is made.
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Old 01-04-2002, 02:20 PM   #5
jlw
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I choked StreetDyno is not really doing an acoustic coupling! I just read through their site. They suggest either a direct connect via voltage divider or an inductive coupler (they point you to the one at Road Dyno).

They are just using a recorder (boombox, etc.) to record from the "sensor". A PC audio input is a convenient way to get the data into the PC for post processing. Hmmm, I am leaning more to the Road Dyno thing. As much as I am into the whole computer geek thing, I can appreciate a little simplification that Raod Dyno provides over homedyno or streetdyno.

Now if some mechanical type would just jump in here. They always have some obvious practical issue that I can't think of.
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Old 01-04-2002, 03:35 PM   #6
Dave_MacKinnon
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This is a bit thin on the technical side, but I will take a stab at this.

Last summer a few local 'enthusiast' friends and I came across some the Street-Dyno software. We rigged up the voltage divider, and went to town on one of the guys Turbo Civics. We fed the recording into the software, along with all the other parameters, and up popped the power curve.

So, here's the math..

Given a known load on the engine (you have to enter gear ratio, final drive ratio, tire size, vehicle weight and a few more items) you can determine how much work is being done given the change in time between the pulses of the waveform. If the engine revs faster, you are making more power.

The results of our runs on a coupld cars produced curves that matched shape and level of roller-dyno curves within a couple of HP.

All the things that confuse the G-tech would also affect this testing method though. Then road needs to be smooth and flat, and you can't experience any wheelspin, so if you are a power monster (not an issue for us) make the pull in 3rd gear.

Kinda fun really...
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Old 01-05-2002, 02:12 AM   #7
p-car
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Old 01-05-2002, 10:47 AM   #8
Dave_MacKinnon
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Nice! I think we'll have to have our own Canadian Dave's Dyno Day as soon as the weather warms up...
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Old 01-05-2002, 01:01 PM   #9
jlw
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hey p-car, thanks for the links. I drilled down a bit and found some discussion on determining optimum shift points. Nope haven't searched i-club for that just yet, but will. They used road dyno to plot out a set of curves to determine those optimums.

Still off topic, but you might guess that you could play around with those numbers a bit more to get a maximum "theoretical" 1/4 mile and/or 0-60 times.
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