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Mustang Technical Discussion > Mustang Projects > hybrids 1966 Coupe Project > Community Forums > Mustang Forum Australia - Mustang Tech

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Ausjacko
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OK, I looked at the link and it was soooo beautiful but that doesn't mean I am buying one of these (as much as I really want to). Please relay this sentiment to H.

Big Mc, don't fill that hole in the hood!


'68 J-code GT Fastback
'67 S-code GT coupe, 'Pink Bitz' formerly known as 'Hookin' up a brother'
'69 M_____ GTS Fastback 'Blasted'

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Pinto-Pete
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Why you got an 871 to fiil it with..?


I'm Batman...

Toyo Spares.
97203177.
5/89-91 Canterbury rd Kilsyth vic.
Specialist Toyota Dismantlers.

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Pinto-Pete
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nassi wrote
Pinto-Pete wrote
hybrid wrote
If 429 and 460 manifolds are the same, you better scrape some money together fella!
store.speedmaster79.co...black.aspx




Now you've done it,....you do of course realise that you would be needed to make it go..


I suppose you will pay with toyo parts???


What...? there's another way......?


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hybrid
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Just for completeness sake... here's the finished box with the ICs in it.
Now this box can sit on the shelf and collect dust because it's not needed.



Last edited by hybrid on Fri Jul 07, 2017 3:31 pm; edited 1 time in total

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boofhead
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Yes but you did a nice job of building it. Very neatly done.

BTW: What is different in the Microsquirt circuity to the MS2 that results in it not being needed?


I will someday think of something clever to say.

Last edited by boofhead on Thu Mar 10, 2016 8:42 pm; edited 1 time in total

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hybrid
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I'm not sure it's only related to Microsquirt. The important part is when you give power to the coils I think.

However on the Microsquirt, once the high current drivers are removed and you set "Going High" for spark output, those two outputs will be Low when the ignition comes on (they are no longer inverted by the drivers), so the coils aren't triggered.

The spark output through the LED circuit is inverted because it goes through an IC that switches ground, which is why you need the pullup resistors. The code knows that the circuit is inverted, so it also inverts. If you ask for "Going High", the code will switch the processor outputs low to provide this. So the concern is that the pullups would provide a "High" signal to the coils until the ECU came online and could invert the signal.

The workaround for this is to make sure your coils are powered via the fuel pump relay. The fuel pump relay can't come in until the ECU is ready, at which time it will also invert the LED outputs and the signal to the coil will be low.

That is my understanding of it.
You can read the thread here if you like:
www.msextra.com/forums...mp;t=61727

BTW, when I get the coils I'm going to install the pullups to the Microsquirt and do a test on this to see what happens.
I can configure the spark outputs temporarily and then just play around in test mode.


Last edited by hybrid on Thu Mar 10, 2016 8:58 pm; edited 2 times in total

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boofhead
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Yes I understand and your summary is a good one. Just did not understand the differences between Microsquirt and MS2 circuitry in this area. I have not bothered to look because I have never used a Microsquirt. As far as powering coils from ECU switched relay (normally applied to the main fuel pump), this is standard wiring practice. So I say Hmmmmmm.
Any way, testing it out is a good move.


I will someday think of something clever to say.

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hybrid
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I know megasquirt use transistors for the LED outputs, where the microsquirt use IC's.

But I'm pretty sure the Micro IC's are just dual transistors anyway.



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hybrid
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The coils arrived today, so I cut up 12 x 33mm spacers to go in between the coils when they're mounted.

I also made up a cardboard template for the aluminium brackets that I will weld to the rocker covers to hold the coils.



I'm still waiting on the 36-1 wheel and trigger to arrive, as well as LS1 coil boots so I can modify my existing leads to fit the LS1 coils.


Last edited by hybrid on Fri Jul 07, 2017 3:30 pm; edited 1 time in total

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boofhead
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I know it is documented all over the place but just in case make sure you use very short dwell period because these coils are known to fire if they are over dwelled. I remember around 2.5ms is all that is needed.

I have researched this to death with the goal to go that was as well so seeing you go forward is exciting.


I will someday think of something clever to say.

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hybrid
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Kris is running them on his HQ, so I will grab the setting from him.
From memory, they took 0.5ms out of what was originally documented.

It's gone down from 4.5ms to 4.0ms or something in the manuals I think. There's also people saying MAX 3.5ms.

I think the best way is to get the first hand experience from Kris.


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boofhead
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Sounds reasonable - he has it working well.

I decided to check the MS3 manual and on page 82 they now recommend 3.5 ms rather than the previous 4.5 ms figure.

Other sites have suggest as low as 2 ms. Any way just wanted to comment in the hope it is helpful.


I will someday think of something clever to say.

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hybrid
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So even their manuals don't agree with each other Laughing
Actually I just double checked and the URL I was looking at was the old manual.

The new Micro manual agrees with what you saw in the MS3 manual.

A dwell figure of 3.5ms is advised for LS1 coils.(was 4.5)


I will check with Kris today also.


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ozbilt
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hybrid wrote


I will check with Kris today also.


Do you guys actually do any "work" there or just go to meetings or talk cars? Impatient


Kerry

It is easier to get older than it it is to get wiser

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hybrid
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Turns out he's off sick today, so I might have to do some work Mr. Green


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