need starting log
Trying to get my car starting faster, but haven't much luck. Anyone with a good starting car that has a log I can look at? Mine goes vey rich just after starting but no matter what I do with cranking makes it start worse. Lowered ASE but when I take out too much it starts running rough after driving away.
Notice how long it takes before it starts injecting fuel after hitting the key btw, 1.1 second. http://dl.dropbox.com/u/3961412/dash.png |
My dad's stock ECU powered MX5 doesn't start any quicker than 1 second.
Note that from your log a good 1/4 of that second is the engine actually syncing, (see the battery voltages drop yet no RPM reading. |
It syncs after 0.5s and starts injecting fuel after 1.1s, it didn't start yet at that point.
The richness after starting makes me think I have too much cranking fuel, and I'd like to get rid of it. Or is that normal behavior? |
The first few injector pulses have a huge effect on ease of starting.
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I just logged mine at lunch.
I logged .808 sec. That was from the moment the MAP dropped from 100Kpa to the moment the motor caught. The second time I logged 1.09 sec. using my manual marks as reference points, so factor in my delay. I wouldn't see any way to improve that. |
but does it go rich like that, just after starting, that's what i'm wondering about if it's normal or not.
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My voltage drops too low when cranking so my LC-1 never logs.
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Starting seems to be way better this year with the new 3.1.1 code...
I have a quite nice log: http://www.ingenieure-reichel.de/upl...t_08_04_11.png As you can see, the AFR drops very low after the start (~10), but that doesn't seem to be so wrong, as the outside temps were ~11°C (51.8°F) so the warmup enrichment and the ASE together could make it run so rich... I took the time in MLV from "crank" lighting up to go out and the time was .579 s. I think I had more problems and it to longer to start with the old code... Greets |
I do hate how long it take the MS to sync when starting. That's a big part of the slightly longer than OEM startup times, shame that you can't have 'batch injection' for startup, without needing to wait for the cam signal would speedup sync a lot I'd have thought?
Suppose it helps build oil pressure though? |
Originally Posted by richyvrlimited
(Post 714171)
I do hate how long it take the MS to sync when starting. That's a big part of the slightly longer than OEM startup times, shame that you can't have 'batch injection' for startup, without needing to wait for the cam signal would speedup sync a lot I'd have thought?
Suppose it helps build oil pressure though? |
Originally Posted by Matt Cramer
(Post 714233)
Huh? It normally does do batch injection on startup, but can't fire the plugs until the cam signal comes in on a Miata.
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thx Sven, looks similar to mine. Voltage drop to about 9V and briefly rich after startup. Guess that's normal. It does seem to sync / start quicker as Crank Y to N takes 1.000 second on mine.
Can I have a look at your starting settings? crank, prime etc I'm on 3.1.0, did anything change to make it start quicker? PS, your Vbatt seems a bit high (15.5V) unless it's not calibrated in MT. |
Hi Frank, I send you my MSQ via Mail...
My battery voltage is not calibrated... (How would I do this - where to measure and what values to use?) |
Originally Posted by Matt Cramer
(Post 714233)
Huh? It normally does do batch injection on startup, but can't fire the plugs until the cam signal comes in on a Miata.
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I have verified this time and time again on the stim - the cranking pulses are sequential if you have setup the ECU for full sequential with additional drivers. There was a thread about it on msextra, IIRC Jean said it was difficult to switch to sequential after batch.
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This was how I understood it too, only a few triggers wheel can do batch on cranking.
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The OEM ECU manages it....
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it's not really slow starting in sequential. I checked a recent log and the "crank" indicator was lit for about .6 seconds before it fired up.
Log http://y8spec.com/megasquirt/vvt_tes...8_18.35.37.msl map http://y8spec.com/megasquirt/vvt_tes...8_09.32.59.msq |
Sorry, I was thinking of the way the injector staging worked in batch fire (it would change the number of squirts from cranking to running).
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Sven, you can adjust batt voltage through Tools - Calibrate battery voltage.
What is your cranking rpm in that log? Didn't get the msq, could you try again? |
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