Miata Turbo Forum - Boost cars, acquire cats.

- MEGAsquirt (https://www.miataturbo.net/megasquirt-18/)

- - Timing map help (https://www.miataturbo.net/megasquirt-18/timing-map-help-91571/)

Just use interpolate. Do you actually idle at 55 kpa? If not, then why is it 10 degrees?

Go over the whole map with interpolation. Like, at 6300 and 7000 rpm, why does it go 36 -> 30 -> 33 -> 30? I would also be worried about your 7000 rpm boost cells, why the huge jump in timing?

Here is a map that I found with a quick search that looks pretty good from a first glance. Doesn't mean this is the map you should run, it's just a quick one I found that shows how smooth a map should be. Look at the 3d tuning map for spark and make sure there aren't any weird peaks or valleys.

https://cimg4.ibsrv.net/gimg/www.mia...5e5a993920.png

Okay, please do this before you blow something up or I'll be forced to post photos of detonation of nightmares.

I hope you're done this, base timing set using these settings, particularly "Fixed timing" area and then adjust the spark angle to line things with the crank/timing light.
https://cimg6.ibsrv.net/gimg/www.mia...c988c921ee.png

Once timing is set, put "Fixed Timing" back to "Use table"

Now get rid of that mess of a spark map, how would that thing ever drive? It jumps around so much.

This is a basemap I got on the mspnp site like most people start with:
https://cimg7.ibsrv.net/gimg/www.mia...da28f847cc.png

Then go have a professional tune it and ask him questions if he is nice.

I'm on Megasquirt 1, I don't think there is a drop down menu with that specific setting. Should I set fixed angle to 10, testing/change offset, then switch back to -10 to use the map?
https://cimg2.ibsrv.net/gimg/www.mia...ae7f36d12b.jpg

taken directly from the MS1 manual

Quote:

Originally Posted by msextra

Trigger Angle (deg) is the angle Before Top Dead Centre (BTDC) when the selected trigger position (Trig Pos) Tooth (if using wheel decoder) or the Vane on the crank or the Points in a locked distributor, etc, passes the sensor. This is used by the ECU to calculate when to fire the coil(s) as it knows that every time it receives a trigger pulse it is at xxdeg BTDC and the entire spark map is worked out when to fire from the Trigger Angle. When the engine is first started this is the angle that needs to be altered to get the spark fired at the correct time, this is done by setting the "Fixed Angle" (this ignores the spark map and holds the sparked angle to the value you enter) to around 10deg and, using a timing light, ensure the ECU is firing the coil at the Fixed Angle. If the timing is not being fired at the fixed angle then alter the "Trigger Angle" until the timing is at thefixed angle. Once the Trigger Angle has been changed so the Fixed Angle is being fired by the ECU then change the Fixed Angle back to -10 so the ECU will follow the spark map.
Typically you should aim for a Trigger Angle of 60-70deg or 0-5deg as this is outside the usual range that the spark is needed. (this can be altered by using a different tooth for triggering on the wheel decoder or by altering the sensor position on MSnS setups)

link for future reference http://www.msextra.com/doc/index-ms1.html

I think I finally got it, set fixed angle to 10, set my trigger angle to 70, went outside and moved CAS until it was 10 degrees on the timing light. Then went back in, set trigger angle to -10 to run the map. Map was showing 15 degrees at idle, TS showed 15 degrees at idle, timing light showed 15 degrees at idle; they all seem to be in sync. So next step is smooth out timing map, right?
Thanks for the help thus far guys