Megasquirt FAQ, writeup (Updated 30/10/09)

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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby MXP_57 » Wed Dec 15, 2010 11:13 pm

BNZ> Do you have any composite logs of your clean signal to see what it should look like?

I'm trying to get a clean signal.

Cheers
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CEIKA Demo car 1987 ST165 JDM 1000kg/700hp http://ceikaperformance.com
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby BNZ » Thu Dec 16, 2010 6:35 am

Nope. Something is not working with the "save log to file" (works once than it does not save anymore) and i can't capture them so i did not bother :shrug:
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby MXP_57 » Sat Dec 18, 2010 1:57 am

Would you mind sending me your msq file? I want to double check all my settings, there must be some mistakes.

If you could email me at mxp.5700 at gmail.com it would be great.

Thank you.
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby MXP_57 » Thu Dec 23, 2010 8:27 am

I found out why it wouldn't start.

I had the Dwell % vs battery voltage table set to 20% all the way.... :crazy:

Basically trying to start with 20% of spark... even lower with the voltage dropping.
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby coyoteboy » Sun Jan 02, 2011 11:58 pm

That AEM ignition map is VASTLY more advanced than my map. I'll have to double check my base timing but at the 100kpa load sites it's got more than 10-15 degrees extra advance in there, and I found it knocking with just 1 or 2 degrees extra on 99 RON (UK) fuel. Quite interesting.
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby BNZ » Mon Jan 03, 2011 7:01 am

please,post your ign map
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby coyoteboy » Mon Jan 03, 2011 5:58 pm

My right hand upper 3rd hasn't been touched much but the middle third and lower half are fairly well covered and used with a couple of thousand miles of driving.

Statically (tuned on a long hill at steady state), the 100kpa+ bins can take more advance, but during acceleration these higher values seem to initiate knock. BIG knock. Knock I can hear through the bulkhead over the unfiltered intake noise.
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby BNZ » Mon Jan 03, 2011 10:25 pm

10x for that,it's a really good guideline
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby coyoteboy » Tue Jan 04, 2011 9:27 pm

No prob, if anything it's a bit conservative but I do want to re-check my base timing to be fair. Good profile though, really improves the drivability of the car.
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby coyoteboy » Fri Jan 07, 2011 11:34 am

Some more info that should help anyone attempting to tune their MS - here are some datalogs I took. I did this by running the megasquirt and LC-1 as a datalogger over the top of the stock UK ATA ECU. The CLT values are a smidge out, the MAT is also not quite right, but not far off (5-10 degrees). Throttle, MAP, AFR (LC1 set in default 0-5v, 7.X to 22.X AFR). Engine had a boost controller but no other fueling/ecu mods so should be as-stock bar the pressures reached.

As you can see the stock ECU sits in closed loop 14.7:1 for a very large percentage of its life, even at 130kpa and sometimes 150kpa part throttle. You can see it hit 8.8:1 at times with WOT though :)

I've no logs of advance as I've nothing to measure it with while driving.

I've two more logs coming in the next post.
Attachments
s3.xls
(150.16 KiB) Downloaded 61 times
s2.xls
(49.02 KiB) Downloaded 57 times
s1.xls
(215.57 KiB) Downloaded 57 times
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby coyoteboy » Fri Jan 07, 2011 11:35 am

logs cont.
Attachments
s5.xls
(191.3 KiB) Downloaded 57 times
s4.xls
(248.28 KiB) Downloaded 53 times
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby coyoteboy » Fri Jan 07, 2011 11:54 am

9.8:1 at 10.29psi and wide throttle. I saw 8.8 at 12psi WOT but don't have the log for that at the moment.
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Image2.gif
Image1.gif
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby BNZ » Fri Jan 07, 2011 1:03 pm

I did also did a log of the AFR with a LM-1 and recorded such big enrichments but i think they are only acceleration enrichments as in the end it tends to lean out to around 11 AFR.
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby tw2 » Fri Jan 07, 2011 7:23 pm

Thanks for all the info. The stock ecu really is an antique. Even on my completely untuned base map that I started with, the difference in driveability over the stock ecu was night and day.
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Re: Megasquirt FAQ, writeup (Updated 30/10/09)

Postby coyoteboy » Sun Jan 09, 2011 4:17 pm

I never spotted mine leaning out at all to be honest, until top end of the rev range and higher boost, which I was fairly sure was the massive over-fueling coming to its limits and the 205 turbo able to over-ride them and lean it out with sufficient air. However UK/US/JAP ecu's may all differ, and I suppose it depends on a lot of other variables. It just amazed me how frequently it was stuck at stoic.

tw2 - yep, the drivability is light years better even bearly tuned.
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