i will ask and post my results back here in case someone else wants to go the same route
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Miata CAS and Crank Sensor?
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I am pretty sure that the Haltech can use a 4-1 cam trigger for sequential inj/ign, but as Alex already said, the timing resolution at fast rpm changes would be horrible.
--FerdiIf you can't differentiate between brake and break, you should go back to school
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Originally posted by ftjandra View PostI am pretty sure that the Haltech can use a 4-1 cam trigger for sequential inj/ign, but as Alex already said, the timing resolution at fast rpm changes would be horrible.
--Ferdi
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I don't think the MS is slow and I don't particularly think my E6X is fast.
Basically, the ecu can't detect fast rpm changes because there are only 4 teeth that are spaced very wide apart - equal to 2 teeth on the crank. The ecu measures the time between each tooth to figure out the rpm. So, obviously the more teeth you have (spaced closer together), the faster the ecu will be able to figure out that the rpm is changing. Whether this has a real affect I can't say.
You see how it has nothing to do with processing speed of the ecu, but more with that it doesn't get enough info?
Btw, I fitted a 60 tooth wheel onto the crank and used the cas sensor for the sync event. I am running sequential injection and waste spark ignition because that's all my E6X can do.
--FerdiLast edited by ftjandra; 02-08-2009, 06:34 PM.If you can't differentiate between brake and break, you should go back to school
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the e6x compared to the ms would be similar however the platinum 1000/200 are much faster
but i get your point and understand what you are saying
I am just confused as to what negatives poor resolution would have?
and if i need to end up fitting a trigger wheel who makes a kit? Do you have pics of your setup Ferdi?
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Well, if the ecu doesn't know what the exact rpm is in 'real-time' how will it know when to send the spark (timing) or how much fuel to inject? If the rpm is changing fast, like on the drag strip, the ecu would always be lagging behind just a few milliseconds. Like, I said, I have no idea how much of a difference it really makes.
I am using an aftermarket crank pulley (ATI) that I fitted a 60-2 trigger wheel onto.
Btw, how do you know the processing speed of the Haltech ecus? Do they list what processors they use inside?
--FerdiIf you can't differentiate between brake and break, you should go back to school
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What I was getting at with poor timing resolution was that if I were to improve my ignition system, I wouldn't consider anything more than wasted spark until I was able to detect changes in RPM faster than what a cam wheel on a belt could.
That being said, the higher resolution of modern cars greatly helps in terms of emissions improvements during engine transients and fault detection (misfires, etc)
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The trigger wheel is one from electromotive. I bored out the center and drilled the mounting holes. The sensor mount I made myself. You are right, those pics don't show the 'fix' because I was one of the first guys to get one. I later added the fix, which required the center of the trigger wheel to be machined down. This post on miata.net has pics with the fix isntalled (you must be a member there to have known about the fix?).
Ah, interesting about the processor speeds. I wish that the communication between the E6X and the laptop would be faster, but that's the only time I feel that it is slow. I think a lot has to do with the Halwin software, which from my experience with it does not seem very well written.
--FerdiIf you can't differentiate between brake and break, you should go back to school
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well... you guys have me convinced! I'll see about getting a trigger wheel made up.
If i can't find a shop or sutable trigger that i can fit to the ati do any of you provide such a service?
Now to clarify why i want to go through all this trouble when i know wasted spark or a dizzy would work is because I love to tinker, i need to learn, and it just seems to be a better way to do things. I still may even end up with a MS depending on my budget.
Haltech has new software for their newer units and they use usb so it will be much faster
EDIT: which part number or what specs are for that trigger wheel? And how much did you have to machine it?Last edited by networkingdude; 02-08-2009, 08:04 PM.
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I used the 6" diameter 60-2 trigger wheel (electromotive part# 230-72660). I don't have the specs of how much I machined off, but once you have the ATI pulley you should be able to easily measure it. Another option I have seen is to mount the trigger wheel on the front of the stock crank pulley. It's not as exact, though, because the front of the pulley can move in relation to the back...it is a damper afterall.
Yes, I wish Haltech would come out with updated software for the E6X as I hear that the software for the newer units is much better. But, I doubt that will ever happen.
Originally posted by networkingdude View PostNow to clarify why i want to go through all this trouble when i know wasted spark or a dizzy would work is because I love to tinker, i need to learn, and it just seems to be a better way to do things.
--FerdiIf you can't differentiate between brake and break, you should go back to school
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Originally posted by networkingdude View Postdo you have pics of the crank sensor mount?
--FerdiIf you can't differentiate between brake and break, you should go back to school
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Miscellaneous Pics of Turbo Protege Build
Big Front Brake Install using Wilwood Calipers
Factory Service Manuals and Familia Brochures - PDF
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