T3 megasquirt II conversion

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Max Welton
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Re: T3 megasquirt II conversion

Post by Max Welton » Mon Sep 16, 2013 11:46 pm

Over on the msextra forums, grom_e30 spotted a problem with battery voltage. I have verified that my bus voltage is indeed wandering about and not well controlled. No good can come from that. All the connections at the VR and also at the generator seem solid. I'll throw a new regulator at it tomorrow.

http://www.msextra.com/forums/viewtopic ... 75#p377206

Most of the analog-to-digital converters I'm familiar with require a reference voltage. If the reference is off, so are all the digital representations of the original analog values. That might explain the MAP excursion you noticed.

As far as using rising edge capture, I actually was getting the double-tooth signature shown in one of tooth-log examples. I reversed the wires on my VR sensor and it cleaned right up. I will try it the other way around, but the trigger capture settings I'm using are stable and I've verified with a timing light that the actual timing agrees with commanded spark advance on TS. That is also how I arrived at the 182° trigger angle while I was running just the single coil.

http://www.msextra.com/forums/viewtopic ... 75#p376357

Max

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Re: T3 megasquirt II conversion

Post by Max Welton » Tue Sep 17, 2013 8:28 pm

OK, replaced the voltage regulator. Actual voltage now does not exceed 14.5 volts. The TS dashboard gauge and the datalog read almost a full volt higher than what my volt-meter says.

It starts right up and runs well, but still only talks to TS for a short time before the previously posted dialog comes up. Now that I know the actual bus voltage isn't dangerously high I think I'll drive it to work tomorrow and see if will halt or just stop talking to TS on my laptop.

http://www.maxwelton2k.net/squareback68 ... .53.36.zip

Max

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Re: T3 megasquirt II conversion

Post by Max Welton » Fri Jan 17, 2014 10:12 pm

So I'm having a problem dropping sync while cranking or idling. Typically it will idle for a minute or two, then stumble. I can hear the fuel pump relay click but the ecu itself has not lost power. This has not happened any other time but while cranking or idling.

I finally caught this in a log. Look for the point at which Lost Sync Count increments. About time 2168.875 .

And on two occasions now it has failed to start. It cranks and the pump initially runs (the ecu has power), but with no sync it doesn't start.

Any ideas?

Tomorrow I am going to take a look at the VR sensor to make sure it isn't loose or anything.

Max
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Re: T3 megasquirt II conversion

Post by Max Welton » Fri Jan 17, 2014 10:22 pm

Here's one that happened while cranking.

Max
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Re: T3 megasquirt II conversion

Post by Max Welton » Mon Jan 20, 2014 6:52 pm

Yesterday I found that one of the spade connectors I use for the VR was only 1/2 on. Today I've been logging every second of my daily drive and haven't dropped sync yet.

Fingers crossed.

Max

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Re: T3 megasquirt II conversion

Post by Piledriver » Tue Jan 21, 2014 1:23 am

Max Welton wrote:Yesterday I found that one of the spade connectors I use for the VR was only 1/2 on. Today I've been logging every second of my daily drive and haven't dropped sync yet.

Fingers crossed.

Max
+++
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

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Re: T3 megasquirt II conversion

Post by Max Welton » Tue Jan 21, 2014 1:40 pm

Still holding solid. And I haven't had a TS comm drop either.

<Arte Johnson>
Very Interesting.
</Arte Johnson>

Max

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Re: T3 megasquirt II conversion

Post by Max Welton » Wed Jan 29, 2014 12:44 am

So the ECU is working just great. But I started having problems with the laptop I use in the car and have reinstalled Windows XP. Now I can't find a driver for the usb to serial cable. Any pointers?

Max

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Re: T3 megasquirt II conversion

Post by Piledriver » Wed Jan 29, 2014 1:58 am

Max Welton wrote:So the ECU is working just great. But I started having problems with the laptop I use in the car and have reinstalled Windows XP. Now I can't find a driver for the usb to serial cable. Any pointers?

Max
Sure :twisted:
http://www.mageia.org/en/

I'm not really being an ass, it works awesome, particularly on older hardware.
XP is done with updates in what, 2 months?
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Re: T3 megasquirt II conversion

Post by Max Welton » Wed Jan 29, 2014 8:00 am

I have not kept up with the Linux varients for a few years. There certainly seem to a lot of different distributions. I do remember struggling to find drivers for video cards and wireless NICs ...

But this computer just needs to be my TS host in the car. And it is one driver away from being back in service.

Max

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Re: T3 megasquirt II conversion

Post by Piledriver » Wed Jan 29, 2014 1:10 pm

Max Welton wrote:I have not kept up with the Linux varients for a few years. There certainly seem to a lot of different distributions. I do remember struggling to find drivers for video cards and wireless NICs ...

But this computer just needs to be my TS host in the car. And it is one driver away from being back in service.

Max
Linux distros are for the most part pretty much plug and play these days.
Generally far easier than Windows setup unless you have oddball hardware.

If you don't know that cable you have, boot off the Linux live cd and plug it in..
(the iso image can be dumped to a USB stick, much faster)


You can then find out exactly what it is by typing dmesg in a shell and reading a bit, or use the hardware info GUI tool.
I, for one, regularly embrace our new robot overlords, as I am the guy fixing the robots...

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Max Welton
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Re: T3 megasquirt II conversion

Post by Max Welton » Wed Jan 29, 2014 8:47 pm


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Re: T3 megasquirt II conversion

Post by Max Welton » Wed Feb 26, 2014 8:43 pm

Finally got the pinion removal tool. Don't mind the mess.

Image

Image

Max

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Re: T3 megasquirt II conversion

Post by Corysvdub » Wed Feb 26, 2014 11:23 pm

So Max are you going full sequential or just crank trigger?
Type 3 Subaru powered EJ25

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Max Welton
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Re: T3 megasquirt II conversion

Post by Max Welton » Wed Feb 26, 2014 11:37 pm

Not on this one. It's working pretty sweet the way it is. 8)

Max

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