MSPNP MSPNP specific Megasquirt related discussion.
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MSPNP2 dwell settings

 
Old 01-02-2015, 04:22 PM
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Default MSPNP2 dwell settings

Base map for a '94-95 1.8 has it set to 3 or 3.5, I forget. Regardless, we had some throttle tip in issues. It was hesitating for a split second when we'd jam the throttle. Raising it to 4.0 really helped, 4.5 REALLY helped. Even the owner, who's raced more Miatas and other cars than I can fathom, was impressed once we upped it to 4.5.

On another project with a MSPNP gen1 and 1.6, I don't THINK I've changed the running dwell, and it's currently at 5.0.

Both cars run stock ignitors/coils with NGK blue plug wires.

Two questions:

1. Am I on borrowed time with 4.5 dwell with his '94-95 coils?

2. Is the MSPNP and MSPNP2 (and 1.6 vs. 1.8 coils) compatible for dwell settings? Should I just up the 1.8 to 5.0 like the gen1 1.6?

Thanks!
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Old 01-02-2015, 10:00 PM
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Interested in what responses you get to this question.
My MS2e in the 94 behaves in a similar manner.
Even with the TPSdot threshold set as low as 20%.

Sounds like upping the dwell might be one solution?
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Old 01-03-2015, 01:30 AM
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It was night and day.
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Old 01-03-2015, 02:20 AM
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Well, the MS9495 map has the dwell set to 3ms.

And for fun I decided to use a bit of Google-fu and found this...

Dwell settings for 1.8 liter coils in the 1994-1997 cars:

These coils charge faster and need slightly less dwell than the 1.6 coils.

Dwell Control: Dwell Control
Cranking Dwell: 7.5 ms
Running Dwell: 4.5 ms


Over at the DIY Auto Tune website.

So, from the sounds of it, maybe 4.5 is bueno?
I went ahead and updated my TS and will see how it acts tomorrow.

Thanks for the info.
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Old 01-03-2015, 03:08 AM
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What firmware are you guys running?
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 01-03-2015, 03:35 AM
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I'm fairly certain I'm on 3.3.1.

I checked the readme notes for the 3.3.2 firmware and the only improvement of interest was the updated rev limiter settings.

The coolant based rev-limiter kicks in way too soon, no matter how I configure it with my 3.3.1 and TS 2.6.04.
I've put off disconnecting the coils to update the firmware for now, since it's a fairly easy thing to live with.
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Old 01-03-2015, 04:21 AM
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Try upgrading to 3.3.2.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
MS Labs: Plug and Play Megasquirt ECUs for ANY 90-05 Miata (NA, NB1, NB2 w/VVT, MSM), including basemaps to get you started ASAP. PM me or email or details.
For support on MS Labs ECUs: Please email, be sure to include the unit's serial number and include a datalog and your current map.
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Old 01-03-2015, 09:01 AM
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I updated to the latest and greatest from DIY when I tuned the car 2-3 weeks ago, 3.3.3.

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