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Old 08-10-2006, 10:25 PM   #21
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Quote:
Originally Posted by Reverant
Jerry,

you might find these pics up to the task:

(LM-1 connected to incar-pc and Megasquirt piggyback on the stock ECU on a 2002 Miata)



That is absolutely SICK!!!
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Old 08-11-2006, 06:37 AM   #22
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Quote:
Originally Posted by blue_sky
That is absolutely SICK!!!
Ah yes, it caught a little cold the other day...
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Old 08-11-2006, 09:51 AM   #23
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It is very sweet-- great integration into the cockpit there. I've considered doing something like that but I don't have a good spot for it in my MR2.... maybe I need to buy a Miata
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Old 08-11-2006, 02:23 PM   #24
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So the DSM instructions apply to what version of the MS, and these are the same instructions used in the miata for the ms??
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Old 08-11-2006, 02:47 PM   #25
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More or less yes they are identical. I've heard so some people removing the LED transistors as well and will need to get some more detail on that to include in a Miata specific writeup I'm working on.

These docs are for using the MS-I with MSns-E firmware.
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Old 08-11-2006, 03:24 PM   #26
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Stop press: For 98+ models retrofitting the CAS from the 90-97 Miatas, at least for the CKP (crankshaft) part of the sensor, the DSM mod is not necessary (and in fact it won't work). This is because (I assume) the way the CAS is fitted on the 90-97 is totally different than the way you and I would fit the CAS (directly on the MS and not shared between the stock ECU and the MS).

Jerry you might want to put that disclaimer on your page until my install is finished.

Jim
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Old 08-13-2006, 04:24 AM   #27
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It would be interesting to see how you go with the COP ignition system in your NB, Jim. Your findings have been great so far!
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Old 08-13-2006, 04:55 AM   #28
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NBs still have wasted spark, not coil on plug. Not much of a detterent though. I'll just have to watch my dwell settings as I have the 1.8 coils with the sensitive ignitors.

Jim
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Old 08-13-2006, 09:00 AM   #29
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That makes me feel a lot better about using MegaSquirt then, I had just made the assumption it had COP and would have to be run as wasted spark!

This thread is absolute gold for the 1.8 ignitors:
http://forum.miata.net/vb/showthread.php?t=166507

Quote:
Originally Posted by JasonC SBB
Here is the relationship of dwell to current for my stock '00 coilpack
( +/- 0.05mS, +/- 0.05A)

At 10V
-------
3A @ 3.0 mS
4A @ 4.5 mS
4.5A @ 5.6 mS (current has begun to bend over)

At 12V
-------
3A @ 2.2 mS
4A @ 3.1 mS
5A @ 4.1 mS
current limits at ~5.5A

At 14V
-------
3A @ 1.9 mS
4A @ 2.6 mS
5A @ 3.4 mS
6A @ 4.4 mS
current limits at ~ 6.5A

Current is pretty much a linear rise except at lower voltages. The relationship between current rate of change and voltage suggests the primary inductance is 1mH. Thererofore 3A is 9mJ, 4A is 16mJ, 5A is 25mJ.

The coil pack begins to operate at something like 2V (very low currents obviously, and I dared to run it as high as 18V.

The input is pull-up to charge, down to fire. The input needed ~26mA @ 4.4V. If the input drive is insufficient the coils don't charge properly, esp. at higher primary currents.

Sorry I didn't have an x1000 probe to measure secondary voltages. I may be able to borrow one from a friend doing pulsed laser power supply design.
Nor did I have the patience to pre-heat the coil to 100*C.

You can use this to program dwell into Hydra/AEM/InsertFaveECU.

I would target 5A pri current when in boost, as for off-boost, maybe someone like Ray A would know.. perhaps 4A.

Enjoy.
Quote:
Originally Posted by JasonC SBB
Oops, that should be 10 mH.

3A -> 45 mJ
4A -> 80 mJ
5A -> 125 mJ

Secondary inductance is 30H, resonant frequency = 2.4 kHz.

In theory then 5A of charge current -> 41 kV max output
4A -> 33kV
3A -> 25 kV
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Old 08-13-2006, 09:08 AM   #30
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Quote:
Originally Posted by saboteur
That makes me feel a lot better about using MegaSquirt then, I had just made the assumption it had COP and would have to be run as wasted spark!

This thread is absolute gold for the 1.8 ignitors:
http://forum.miata.net/vb/showthread.php?t=166507
Mate you're a ledgend! I've been looking for something along those lines to protect my fragile 1.8 coils!

now if only my MS would arrive and I could get to building the thing!

EDIT: although after skim reading it i'm still non-the wiser at what dwell settings would be safe for me :?
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Old 08-13-2006, 09:40 AM   #31
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Quote:
Originally Posted by JasonC SBB
I would target 5A pri current when in boost, as for off-boost, maybe someone like Ray A would know.. perhaps 4A

5A @ 4.1 mS @ 12V
5A @ 3.4 mS @ 14v
I am making another assumption here but I would say to aim for something between those, closer to the 3.4 mS to be conservative. Would that be strong enough if the voltage drops though? I don't have any direct experience so please don't take this as gospel!
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Old 08-13-2006, 10:56 AM   #32
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Tim, is yours an NA or an NB? (mine's an NB8C, aka "facelift").
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Old 08-13-2006, 06:19 PM   #33
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I haven't bought one yet, I'm saving to buy one for Christmas since I don't want a loan. I'm looking for a 6 speed so that will mean 2001+ (has fog lights etc).

In the mean time I have bought the MegaSquirt and a Garrett T28 (which I am rebuilding) to keep me busy!

JasonC has an NB8A I believe. Don't know if the NA and NB ignitors are different.

Jerry, you need to change the title of the Mazda Miata guide on your site, when you go to bookmark it, it says it is for a 4g63!
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