Spudmn's Puma board build

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Fred
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Re: Spudmn's Puma board build

Post by Fred »

Gutted about the burned ignitor, check your coil too! Welcome to MegaSquirt! No, wait? Welcome to Puma? Hmmmm :-/ You could bread board a fet driver setup and that will likely solve it.

OK, log!

Please upgrade to latest code with limiters in it, and film me a video of it against one in neutral :-) I had to downgrade my OLV to read it... Don't wanna do that. Will post a warning to others to get the latest firmware ASAP.

Two sync loss during cranking, will investigate for you.
0.4v p2p brv noise while running, pretty consistent
RPM is stable enough, will get properly stable with code change soonish
MAP good vacuum on the over run (30kpa), pretty restrictive carbs at WOT, unless it wasn't WOT (no TPS), though from the 1,2,3 pull it looks like it was.

Carbies appear to be hurting you after about 3.5k RPM just FYI :-)

MAP signal is usable, though kinda bad. Further code will help it look better in the log, though engine is already using consistent values due to timing of sample, math and output ;-)

Hope that helps!

Fred.
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Spudmn
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Re: Spudmn's Puma board build

Post by Spudmn »

OK. I will upgrade today.

I didn't go WOT.
check your coil too
I replaced one of them as well just to be on the safe side. It looked like it had got a bit hot.
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Re: Spudmn's Puma board build

Post by Fred »

No rush on firmware, just before next log, please :-)

OK re WOT. Ignore comments, then, though they still might be relevant.

Yeah, not surprised that it got hot. How well heatsinked is your ignitor?

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Re: Spudmn's Puma board build

Post by Fred »

BTW, re 0.4V BRV noise, though it is consistent, that is quite a lot, possibly a function of an old style regulator? With dwell it's no big deal, but with injector dead time, esp on an A series engine, it's going to be a fairly big deal, UNLESS you flatten the curve in the range that it flickers OR we add averaging. Averaging BRV has its own issues during starting, though, and really needs to be a timed reading to be stable.

Any chance of rigging some sort of TPS for the old carbies? Or even some digital IO for WOT and Closed?

Fred.
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Re: Spudmn's Puma board build

Post by Spudmn »

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Re: Spudmn's Puma board build

Post by Fred »

I don't always use smilies...

:) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-)
:) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-)
:) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-)
:) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-)
:) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-)
:) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-)
:) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-) :) :D :mrgreen: 8-)

...but when I do, I use a lot of them!
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Re: Spudmn's Puma board build

Post by Fred »

:-)

Image
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Re: Spudmn's Puma board build

Post by ehb »

Sweet noise! Loving it :)
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Re: Spudmn's Puma board build

Post by Spudmn »

ehb wrote:Sweet noise! Loving it :)
Yeap. It sounds like an anti-lag system.

Fred. I take it that this is a hard cut? With my set up it is going to sound nice with the carbs dumping heaps of fuel and the CAM overlap and wasted spark.
How well heatsinked is your ignitor?
It has a pretty good heatsink. Doesn't get hot under normal use. But if the FET is on (or off in my case) it gets very hot, very fast.
Any chance of rigging some sort of TPS for the old carbies?
Yeap. I have all the bits. I just need to work out how to mount it.
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Re: Spudmn's Puma board build

Post by Fred »

Yeah, it's a hard cut :-) You can make it smoother and less antilaggy by decreasing the hysteresis, down to 0.5 RPM if you want. Then it'll just run up against it and insufficient unburnt gasses will get into the exhaust to make noise. Note fuel cuts should maintain a decent hysteresis to avoid lean conditions - this is not required for ign cuts. You can leave it big for effect, too, if you want, you might want to play with how it affects the car when you run into it mid corner. A larger hysteresis is going to destabilise the vehicle. Having almost none will make it silky smooth and just stop accelerating as opposed to go backwards briefly. Make sense?

Soft with retard is easily doable in code too, if you want, but it's not really worthwhile most of the time IMO.

Good news on the TPS :-)

Fred.
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