Spark A is occurring when cylinder 4 is at TDC instead of 1

Testing and development of Megasquirt 3

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opel
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Spark A is occurring when cylinder 4 is at TDC instead of 1

Post by opel »

The MS3 code is insisting on a 4-2-1-3 firing order for me. (firing order should be 1-3-4-2) Is anyone running 420A/Neon mode full sequential on the MS3? If you are- could you please post a Composite Log for me to peek at?

Tried with Alpha 11, 14, 17, 18, and Beta 19 firmwares.

Thanks

For reference here is my original composite log before I started screwing with jumpers:
Image
(both signals appear inverted, ignition capture 'rising edge' to make engine run)
Last edited by opel on Tue May 08, 2012 6:54 pm, edited 1 time in total.
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by dontz125 »

If your firing order is off 360°, add 360° to your trigger angle.
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opel
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

dontz125 wrote:If your firing order is off 360°, add 360° to your trigger angle.
Image
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by UnaClocker »

I ran full sequential on my 2.0 swapped van the whole time MS3 was in pre-1.0 alpha and beta. Ran really really well.
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by turbodoug »

I don't have a composite log handy.... but, I've been running MS3 full sequential for about a year... runs great... code works fine!
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

Can one of you guys post a composite log MS3 + MS3X right?

Also - what firmwares you running?
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by dontz125 »

Sorry - not Trigger Offset, but "Tooth #1 Angle".
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by jsmcortina »

The custom decoders such as 420A only allow a +/-20 degree timing reference adjustment.

Yes please on a composite log - but also confirm your crank and cam tach input wiring inside the ECU.

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opel
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

Can anyone help me?
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by UnaClocker »

Flip the cam magnet 180 degrees.
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by jsmcortina »

But which way is correct???

The firmware should be coded so that a standard engine hooked up as per the manual will work correctly.
i.e. cam into MS3X cam and crank into mainboard "VR" with VROUT-TSEL (J1 3-4 on V3.57)

James
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by UnaClocker »

Lots of people have run this code with no problem. I ran this code with no problem. This has to be one of the best tested decoders out there. Phasing should be correct. If he's done the trick where you have to rotate the cam magnet 90 degrees, he rotated it 90 degrees in the wrong direction, making it 180 off from where it needs to be.
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opel
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

UnaClocker wrote:Lots of people have run this code with no problem. I ran this code with no problem. This has to be one of the best tested decoders out there. Phasing should be correct. If he's done the trick where you have to rotate the cam magnet 90 degrees, he rotated it 90 degrees in the wrong direction, making it 180 off from where it needs to be.
Cam magnet is in stock position, can't even rotate it because the plastic nubs prevent that. I could shear them off or something I guess, but why should I have to do this? If the code is indeed right, it should be firing in correct order now, with both signals inverted with ignition capture set to rising edge.
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by UnaClocker »

Are you still running SOHC? Are you sure you have the correct cam? The NGC motors had the magnet orientation different than the earlier 420a/SBEC motors.
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

UnaClocker wrote:Are you still running SOHC? Are you sure you have the correct cam? The NGC motors had the magnet orientation different than the earlier 420a/SBEC motors.
SOHC, the cam I'm running is a Crane 0014. Isn't the magnet orientation dependent on the magnet tangs placement not the camshaft? Also - isn't the NGC cam magnet a different pattern from the SBEC?

Would the stock (SBEC) computer still run the car normal with the different orientation magnet?
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by UnaClocker »

Ok, so it's not a stock cam, so it's entirely possible they put the orientation pins in the wrong orientation. Yes, the NGC magnet wouldn't work at all, but you can bolt an NGC magnet onto an SBEC cam and vise versa.
The stock computer should have the same problem with the magnet being off that the MS has.
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

OK - rotated magnet 180° - wouldn't start. RPM jumping 0 - cranking rapidly. Switched ign capture - RPM stays at 0.
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by UnaClocker »

180, so it's fully opposite? Not 90 degrees? I don't see why that wouldn't sync up, the crank goes around twice for each revolution of the cam. You've simply aligned the cam magnet with the opposite phase of the crank. Am I missing something, James?
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

When was the phasing change made in the 420A/Neon mode James? I want to go back before the change and see if the engine runs normally.

I haven't tried firmware older than Alpha 11 and no release code
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Re: Anyone (successfully) running 420A/Neon full sequential?

Post by opel »

I wonder if someone accidentally counted the cylinders right-to-left......

Cyl #1 is farthest from the transmission
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