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MetricMalibu
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Joined: 07/09/2017 - 21:41
Setting Up Hall Effect Drive Shaft Speed Sensor (DSS)

I'm trying to set up a hall effect drive shaft speed sensor that uses an 18 tooth reluctor wheel in the AQ1 logger and want to know if i will be able to view drive shaft speed? The only option in the Analog/Frequency channels that has "pulses per revolution" is vehicle speed. Is there a way to have it display rpm of the drive shaft and not speed of the vehilce? I tried down loading the drag race template but it says its "Program Cannot Read File". I wanted to see how you set up the Edelbrock DSS sensor. Thanks for any and all help!

 

MetricMalibu
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Joined: 07/09/2017 - 21:41
Watching the drag race

Watching the drag race template video i see that drive shaft speed was configured as Engine speed/RPM which makes total sense thinking about it after i saw it. But only problem is that the option for pulses per engine revolution only goes to 12 or 14. So that wont work with my 18 tooth wheel. Is there a way to increase the pulse options in the drop down?

 

AEM_NS
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Joined: 06/06/2014 - 09:31
Just record the raw frequency

Just record the raw frequency and then apply a math channel in AEMdata to go from frequency to RPM.

MetricMalibu
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I used engine speed for the

I used engine speed for the DSS speed sensor, and as I noted it have 18 pulses per revolution, so I selected 6 and applied a math channel in AEM Data and divided it by 3.

set up at 6 pulses per revoltion it rotates once and thinks it has been around 3 times. Is this correct and a good way to get Drive shaft RPM with my 18 tooth reluctor wheel?

 

I also thought I could use the speed options and get mph, then apply the math to convert MPH to RPM ( RPM = Rear end ratio x MPH x  336.136 / Tire height )

Is this correct and work too?

Is there a better way? as you noted use the raw frequency and apply a math channel? how would i do that exactly, I looked at it and couldn't come up with anything that worked.

Thanks,

AEM_NS
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Your first idea is simple and

Your first idea is simple and should work. Have you tried it? Other ways will work too but it just depends on how much math you want to do.

MetricMalibu
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I did try the first idea

I did try the first idea using 6 pulses and applying a math channel to divide by 3.

Only problem it I had the trans in 1st gear not thinking and its a powerglide with 1.80 1st gear, but I did add to the math channel to make it 1:1 ratio. Graph looked a little funny after but it was very close to the engine RPM. I also ran the car on jack stands so I'm not sure how this would affect the converter locking up/slippage.

I will try again tonight with the trans in 2nd/ 1:1 and let you know., see if I can post the graph too for your review and input.

Thanks again for the all the help greatly appreciated!

 

AEM_NS
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BTW to get rpm from raw

BTW to get rpm from raw frequency in this case is (freq*60)/18. So that's frequency (pulses per second) times 60 seconds for pulses per minute divide by 18 pulses per rev gets you revs per minute.

AEM_NS
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MetricMalibu wrote: Only

MetricMalibu wrote:
Only problem it I had the trans in 1st gear not thinking and its a powerglide with 1.80 1st gear, but I did add to the math channel to make it 1:1 ratio.

Ah so you did some extra math to try and make driveshaft speed match engine speed.  That works and should have been pretty close.  As I'm sure you're discovering, the AQ-1 and AEMdata are extremely flexible.  You can set it up to do whatever you want.  There's no real right or wrong way to do things.

MetricMalibu
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Would I need to adjust the AQ

Would I need to adjust the AQ-1 logger programing to produce a channel with raw frequency, or is there a way in AEMData that I can make a channel with raw frequency that comes out of the logger?

I like using the RPM selection with 6 pulses and adding a math channel as it is simpler (like you noted) and eliminates the tire size/gear ratio/ and MPH factors in extracting the data I want (DSS).

 

I only added the math to take out the 1.8 gear ratio for testing purposes at home last night. I want to see how close it is to engine RPM on jack stands.

I am blown away with the capabilities and ability to adjust settings to produce data you want. The physical quality of the products is also excellent, wires labeled, high quality connectors and wire. Everything is top notch! I have your AFR wide band gauge and now the logger, but will definatltey look to use more of your products if I can in the future!

Tech support is also fantastic, I post here at night and you answer by mid-morning. I have looked on the other forum sections and it seems there is a person dedicated to each section and they answer just as quick. This alone will make me a repeat customer/AEM user!

AEM_NS
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In the Analog/Frequency setup

In the Analog/Frequency setup, you can set the input mode to frequency and Hz will be recorded. You can also configure the channel to record period in miliseconds too if you want to do it that way.

I'm glad to hear you're liking our stuff and support. yes