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finally got a TACH signal... but..
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Post finally got a TACH signal... but.. 
Hi, first time posting yet I have done lots of research. My problem is my tachometer is off. I tried multiple points to get a good signal and none worked. I finally just came off one of my individual coil packs and am receiving a read out. I have the coilx installed to protect the RCPro2 from damage. I am comparing the RCP2 tach speed to my cars tach and they do not match. The RCP2 is about half what the engine is actually turning. I have messed with the pulse per revolution, speed and sample rate. The read out is just very low. Im working on an e36 obd1 car with an m52. Ideas?

I did get some other real time data to show up on podium.live and that was certainly encouraging! Just have to do the tedious work of scaling the analog inputs... Sad

Thank you,

Johnathan

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bahnstormer wrote:
Hi, first time posting yet I have done lots of research. My problem is my tachometer is off. I tried multiple points to get a good signal and none worked. I finally just came off one of my individual coil packs and am receiving a read out. I have the coilx installed to protect the RCPro2 from damage. I am comparing the RCP2 tach speed to my cars tach and they do not match. The RCP2 is about half what the engine is actually turning. I have messed with the pulse per revolution, speed and sample rate. The read out is just very low. Im working on an e36 obd1 car with an m52. Ideas?

I did get some other real time data to show up on podium.live and that was certainly encouraging! Just have to do the tedious work of scaling the analog inputs... Sad

Thank you,

Johnathan



I just setup my RCP tonight, and im running into the same issue. I had to set it to 2 cyl for my 4 cyl to read properly. not sure if i did something wrong or not. I have a EG civic with a b20vtec


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Junction Auto Sport
ChumpCar Canada
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thanks for the reply, ill give that a shot!

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how did you do that? with the drop down menu that goes upto 30-50 (don't recall)

thank you.

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bahnstormer wrote:
how did you do that? with the drop down menu that goes upto 30-50 (don't recall)

thank you.


Go to the Pulse/RPM tab, then click on "Pulse per revolution" and i had to select 2, even though its a 4 cylinder. not sure why, but it worked!


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Junction Auto Sport
ChumpCar Canada
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interesting, my understanding that number was pulses per revolution. not the number of cylinders. I played with quite a few of those settings. I will check 6 again (bmw e30 with m52) and try again. thank you for the speedy replies.

johnathan

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bahnstormer wrote:
interesting, my understanding that number was pulses per revolution. not the number of cylinders. I played with quite a few of those settings. I will check 6 again (bmw e30 with m52) and try again. thank you for the speedy replies.

johnathan



Generally, as far as i know, theres 1 pulse per revolution, but i could be wrong. Like i said, chosing 2 worked for me on the honda.


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Junction Auto Sport
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It all depends on the number of ignition pulses per revolution of the engine; ignition systems behave differently based on distributor based ignition, individual coil packs or wasted spark. Usually trial / error solves it!


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Brent Picasso
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if I put it on 1 it shows 660 at idle, the engine idles at 1300. At the limiter 6500 it shows 2700rom. Everytime I go up it splits the number in half.

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Thanks. Looks like we need a "0.5" option for the divider. We'll file an issue to track this.

*edit*
tracking here: https://github.com/autosportlabs/RaceCapture-Pro_firmware/issues/898


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Brent Picasso
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Brent,
I really need an update for this. We have used the car multiple times without a tachometer. We purchased the system to do away with the gauges and run everything off the tablet. I do not want to have to abort.

Anything new?

Thank you.

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Thanks for pinging back. We're scheduling it for the next update, which should be available for beta testing soon (1-2 weeks).

Watch for our blog and facebook updates for news when this is announced.


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Brent Picasso
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will the new update include the fix for the tachometer?

thank you,

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I believe so. We'll be adding the 0.5 pulse per revolution divider, which should address the 2x RPM that you're seeing.


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Brent Picasso
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you should do .25 and .125 also just to cover all basis?

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