CAJ Innovations Forums - MkIII voltage boost

Luhbo Full Member Offline I Like My15M! Posts: 186 Germany	Re: MkIII voltage boost Reply #15 - 05/16/09 at 22:03:10 I thought you did so already, with good results, didn't you? Hubert
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greenmonster

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Re: MkIII voltage boost
Reply #16 - 05/17/09 at 02:27:45

Had new standard battery & did some mapping which helped kickbacks, but still no easy start.

My simple mind has hard to get past 2 simple facts:
1. Without plugcaps, engine rotates on starter motor
easy. Means to me no problems w compression or lighter flywheel.
MyP8 seems to stop before even one rev is completed.
2. It starts quite easy w OEM P7 w standard chip.
Means to me, something is wrong w MyP8, mapping or whatever. And could mean battery is OK.

Any thoughts welcome, hope threadjack is OK now when raz seems to gotten his answers.
Note: All 3 Duc 900`s I know of w MyECU have starting troubles, esp when starting from cold.

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Ducati 907IE MyECU P8

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Luhbo

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Re: MkIII voltage boost
Reply #17 - 05/17/09 at 03:12:26

My mind's as simple as your's in this case, to be honest. If you can't check whether the electronics are working ok, then the next thing I'd try was to set column 1 from 500 to 750 (this works, i've done so in my V11), set TDCWhileCranking=1 and set Prime values to 1 throughout. With this configuration the starter motor should turn the engine as easy as with removed plug caps (no fuel there to preignite). Just for testing, of course it won't start. Then step by step give more priming, 500, 1000, 1500 ... Short tests of 2 or 3 seconds are enough to see whether it works or not, and by keeping this short you won't hurt neither your starter nor your battery.

Writing this I stumble over a question: if you have the plug caps off and let the starter turn your engine: do you open the throttle while "starting" or do you have it closed? This may also make the difference between rotate and stall.

Do you have an Optimiser? And let someone else doublecheck your map for writing errors.

Hubert

PS: and forget about mapping at this phase. Stirring the map over and over won't do any good. Starting is affected only by the "Prime" line, in fact just by one value (at 20°C for instance).

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« Last Edit: 05/17/09 at 03:18:09 by Luhbo »

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raz Senior Member Offline Guzzi 11OO Sport, My16MkV, Innovate LC-1 Posts: 373 Stockholm, Sweden Gender:	Re: MkIII voltage boost Reply #18 - 05/17/09 at 05:22:04 Again, if I were you I would strobe the flywheel when cranking using TDC=1. Everybody have a strobe light, you should be able to borrow one. Our Guzzis have an inspection hole for strobing flywheel, and TDC marks, I assume your Ducati has something similar? It's such an easy way of taking a couple of guesses out of the equation.
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raz

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Re: MkIII voltage boost
Reply #19 - 05/18/09 at 08:45:58

greenmonster wrote on 05/16/09 at 09:57:21:

Just to b sure.
Quote:

"voltage boost capability that is used to help MyECU remain adequately powered while starting"

Do I have that function on my MyECU P8?

You mentioned D17 and Q5 in the v11lemans.com thread so it is there allright.
If you can't reach D17 you can measure at pin 1 of the regulator (LM2940) or D18, or the positive side of C16 or C18. Or D2 or D3... you got to find it somewhere

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greenmonster

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Re: MkIII voltage boost
Reply #20 - 05/21/09 at 10:01:50

Quote:

the next thing I'd try was to set column 1 from 500 to 750 (this works, i've done so in my V11), set TDCWhileCranking=1 and set Prime values to 1 throughout. With this configuration the starter motor should turn the engine as easy as with removed plug caps (no fuel there to preignite). Just for testing, of course it won't start. Then step by step give more priming, 500, 1000, 1500 ... Short tests of 2 or 3 seconds are enough to see whether it works or not, and by keeping this short you won't hurt neither your starter nor your battery.

Writing this I stumble over a question: if you have the plug caps off and let the starter turn your engine: do you open the throttle while "starting" or do you have it closed? This may also make the difference between rotate and stall.

Good advice, thx!

Did this, see V11 forum.

Will check ign someday, raz... Wink

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« Last Edit: 05/21/09 at 10:02:31 by greenmonster »

Ducati 907IE MyECU P8

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raz

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Re: MkIII voltage boost
Reply #21 - 05/30/09 at 04:39:16

_Cliff_ wrote on 04/30/09 at 18:45:13:

It boosts the 12V to about 18.

Done now. For some reason I only get about 14.5 volts at the regulator, having 12.8 volts from battery. It not a huge boost but it may still help me someday. Maybe my DVM get confused from ripple? I miss my analog meter Undecided

Or does this indicate something is not right?

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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: MkIII voltage boost Reply #22 - 05/30/09 at 07:26:54 Seems a little low. Did you have extra load like the Optimiser or serial adapter? The boost increases as the input voltage drops. Try a 9V battery
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raz Senior Member Offline Guzzi 11OO Sport, My16MkV, Innovate LC-1 Posts: 373 Stockholm, Sweden Gender:	Re: MkIII voltage boost Reply #23 - 02/12/10 at 11:06:29 Even with less than 9V input, I get about 15 volts measured with an analog meter. My DVM seem to dislike the ripple and shows a fluctuating value, but always over 13 volts. Having seen some cranking logs I'm sure this voltage boost is a very good feature...
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raz Senior Member Offline Guzzi 11OO Sport, My16MkV, Innovate LC-1 Posts: 373 Stockholm, Sweden Gender:	Re: MkIII voltage boost Reply #24 - 02/14/10 at 23:49:39 Whoa, now it's over 20 volts. You changed the pulsing in the new firmware, right Cliff? On the bench with no sensors loading the 5V and no Optimiser, it's over 27 volts. With Optimiser it's 23 V. This is with 8.6V in from the battery. As long as it don't exceed 30 volts it's just a good thing, right?
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_Cliff_ YaBB Moderator Offline I Love YaBB 2! Posts: 126	Re: MkIII voltage boost Reply #25 - 02/15/10 at 07:44:23 I recently changed the 2 100uH in series to a single 100uH. Just add wire a link across one of them. Much over 20 may damage the FET gates.
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raz Senior Member Offline Guzzi 11OO Sport, My16MkV, Innovate LC-1 Posts: 373 Stockholm, Sweden Gender:	Re: MkIII voltage boost Reply #26 - 02/16/10 at 09:07:12 Doh, I missed that. Now much better, about 18 volts. I also made a Bluetooth connection today! You never told me the pairing PIN but I eavesdropped it from the ECU init
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