DannyC
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| posted on 13/5/13 at 02:27 PM |
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Trigger Wheel in MS
Just started setting up MS and I have a bit if confusion on the trigger wheel inputs into Tunerstudio.
My engine (Mini A series SPI) has a 36 tooth wheel, on the crank, with two teeth missing 180 degree apart.
The help states 'No. consecutive missing teeth', so 36-2, which was my original thought, does not seem correct.
What should I enter? 36-1, 18-1, 36-2 or any other options?
Thanks
Danny
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matt_gsxr
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| posted on 13/5/13 at 04:01 PM |
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None of those options it is expecting the missing teeth to be in a block together.
With your crank how does the engine actually know where the crank is? Is there an additional cam wheel or something?
Matt
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matt_gsxr
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| posted on 13/5/13 at 04:03 PM |
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I guess if you are running fuel only (so don't care about timing) then you could pretend your wheel is a 18 tooth wheel with 1 missing tooth.
Then 18-1 would be the answer.
But then your RPM will by out by a factor of 0.5 and it will get messy.
If you are running sparks too from the MS then I can't see the above working
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matt_gsxr
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| posted on 13/5/13 at 04:11 PM |
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If you are running MS2 or later then I think it actually supports 36-1-1
Here is a table http://www.ms3efi.com/feature-xref.html
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DannyC
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| posted on 13/5/13 at 04:27 PM |
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Thanks for the reply Matt, I was getting worried that there would be no replies!
The help text statement of 'missing consecutive teeth' would mean in a block together and one of the pictures, on ExtraEFI, shows this on
a 60-2 ring.
I am using MS2 both spark & fuel, semi seq, therefore, squirt and spark every 360 deg., but I am not sure how 36-1+1 can be entered.
Danny
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matt_gsxr
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| posted on 13/5/13 at 05:41 PM |
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If you are running the MSExtra code then you can select your trigger wheel from the drop-down
"Ignition Option"
Spark mode == Rover#1
I don't understand how this can get the spark timing correct though, as from my understanding your trigger wheel is symmetrical!
I guess you would need to run your spark with a distributor (or have another sensor that tells you the phase of the crank).
You could pick up a 36-1 wheel from these guys http://trigger-wheels.com/store/contents/en-uk/d37.html
but it isn't particularly locost.
Matt
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DannyC
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| posted on 13/5/13 at 05:53 PM |
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Matt
The engine did originally have a distributer, but now using MS with throttle bodies, and yes the wheel is symetrical.
I saw the choices of Rover #1, #2 & #3, but not knowing what they refer to, I was reluctant to use any of them.
From your comment, are you suggesting this will not work as it is?
Thanks
Danny
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matt_gsxr
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| posted on 14/5/13 at 10:04 AM |
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According to this thread:
http://www.msextra.com/forums/viewtopic.php?f=101&t=36943
Yes.
As ever try with fuel and sparks disconnected and see if it is doing the right thing first. Then you can connect up a timing light and see if the
sparks are at about the right time.
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DannyC
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| posted on 14/5/13 at 10:29 AM |
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Matt
I can not see how 36-1-1 is set in TunerStudio. Is this the 'second trigger active' used in 'dual wheel' (although I do not
have duel wheels)
Any idea?
Danny
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matt_gsxr
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| posted on 14/5/13 at 11:07 AM |
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Are you running the MSExtra code?
If so then:
Basic setup
Tach input/ignition settings
Spark mode (dizzy, EDIS, wheel) --> Rover#1
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DannyC
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| posted on 14/5/13 at 11:26 AM |
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OK, I was looking for 36-1-1 somewhere.
Is there a desciption of the different choices. i.e. how would I know what this setting was compared with the other choices, if you did not tell
me?
Danny
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matt_gsxr
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| posted on 14/5/13 at 01:18 PM |
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I found it with google, the megasquirt documentation is all over the place (I mean this literally and metaphorically).
http://www.msextra.com/doc/ms3/trigger-wheel.html
The most reliable route is to check the code itself (the relevant source code is all available).
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DannyC
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| posted on 14/5/13 at 02:05 PM |
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Thanks Matt, the table is really useful.
Danny
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matt_gsxr
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| posted on 16/5/13 at 09:38 PM |
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So, is it working?
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baz-R
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| posted on 18/5/13 at 09:10 PM |
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good old rover had all sorts of odd trigger setups
just so you can decode what thay mean 36-1 is 36 teeth minus 1 so has 35 with one missing to alow sync so ecu knows where crank is at
60-2 would have 58teeth with a gap of 2 teeth
rover went mad and put gap tooth gap tooth gap so you had 36-1-1 etc. ms'ers tried to make it easy and just gave us rover#x
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