Recording Glitch

Tuning The Delco In Realtime
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Recording Glitch

Postby v6bucket » Mon Sep 11, 2017 7:29 am

I was tuning the Dato on Saturday, & while it was doing a power run(on the dyno) around the 3000 rpm area, the screen would freeze & the recording would stop then restart on the run down, which makes it had to check things at full noise. I didn't notice it until the last run, I was fixed on the O2 meter & oil pressure on the dash. I'm using a VL400 RS232 cable, NVRam 808ecm & HP 250 g5 notebook i5. Is this the laptop not keeping up or some other issue? I do have a V2 Logger as well but didn't have it connected, thinking that I could view the logs on the laptop later unaware that the parts I need to check are blank.
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Re: Recording Glitch

Postby antus » Mon Sep 11, 2017 9:08 am

Thats usually a physical missfire and the electrical noise from the spark arcing where its not meant to interfears with the comms to the laptop. Check the high voltage side of your ignition, plugs etc.
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Re: Recording Glitch

Postby v6bucket » Mon Sep 11, 2017 2:01 pm

Plugs are new, we had a brand new one fail, so fitted another set before the last run up on the dyno. I'll get him to fit some leads, maybe coils also.
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Re: Recording Glitch

Postby delcowizzid » Mon Sep 11, 2017 2:52 pm

Resistor plugs too
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Re: Recording Glitch

Postby Biggvl » Mon Sep 11, 2017 3:43 pm

Ferrite bead on the USB cable? I got caught with this once because I picked up the wrong USB cable (didn't have the bead on it) plugged in the correct lead and it was fine.
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Re: Recording Glitch

Postby antus » Mon Sep 11, 2017 5:04 pm

Ive seen arcing across the coilpacks between the terminal and its ground plate from bad insulation at the end of the lead connector cause this. That one was identified after running it up in the dark and could see the arcing.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

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Re: Recording Glitch

Postby v6bucket » Mon Sep 11, 2017 5:45 pm

Biggvl wrote:Ferrite bead on the USB cable? I got caught with this once because I picked up the wrong USB cable (didn't have the bead on it) plugged in the correct lead and it was fine.

I'm using an RS232 cable, which I don't think has a bead on it, I'll check it when I get my ecu back tomorrow.
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Re: Recording Glitch

Postby VL400 » Mon Sep 11, 2017 6:26 pm

No bead on RS232 cables, it does not matter as much as USB which is far more fragile.

As above, resistor plugs and spiral wound leads are a must on any EFI vehicle.

Could also be your laptop going in to hard drive protection mode from the vibration.

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Re: Recording Glitch

Postby v6bucket » Mon Sep 11, 2017 7:42 pm

Thanks VL400, it
has resistor plugs, leads I'm not sure.
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