12 tooth crank trigger wheel and MS, Hydra, Adaptronic, and AEM
#1
12 tooth crank trigger wheel and MS, Hydra, Adaptronic, and AEM
The AEM can use a higher resolution 12 tooth crank trigger wheel.
How about the MS, Hydra, and Adaptronic?
How about the MS, Hydra, and Adaptronic?
#3
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,046
Total Cats: 6,607
The Megasquirts (1, 2, and 3) can be set to read pretty much any wheel pattern imaginable, with any number of primary teeth and any number of missing teeth, with the following caveats:
1: The missing teeth (if more than one) must be sequential.
2: The spacing of the teeth must be even (there are some custom exceptions possible with the MS2/3, but that is rocket science.)
3: A second (cam) wheel is supported for use with crankwheels that have no missing teeth, and/or for fully sequential operation. This wheel is not required for batch-fire when a missing-tooth crankwheel is used. The camwheel can be used whether or not the crankwheel has missing teeth.
With the MS2 and 3, higher toothcounts equal better spark accuracy, as the ECU will, in realtime, select the tooth which is closest to (but prior to) the calculated spark angle, and use that tooth as the trigger to launch the spark countdown timer. On the MS1, this feature does not exist. You can use any toothcount wheel that you wish, however you must specify a particular pair of teeth to be the trigger teeth, and these teeth must be far enough prior to TDC (and BDC) to accommodate the greatest possible spark advance. IOW, it is functionally equivalent to having a two-tooth wheel, with a phantom third tooth (the missing tooth) used for phasing. One exception does exist, in that during cranking, even the MS1 is capable of triggering on a specific, predefined tooth, as opposed to calculating all the way back from the "primary" trigger tooth.
A question: I understand that with the default configuration, the AEM is limited to a 12 tooth wheel. However I have come across some postings on various forii which suggest that it is possible to use more conventional wheel designs (such as 36-1) by setting up "tooth control table" which I don't quite understand. Examples:
36-1 teeth on the crank , 1 tooth on CAM
http://www.et.byu.edu/groups/icengin...ecognition.pdf
1: The missing teeth (if more than one) must be sequential.
2: The spacing of the teeth must be even (there are some custom exceptions possible with the MS2/3, but that is rocket science.)
3: A second (cam) wheel is supported for use with crankwheels that have no missing teeth, and/or for fully sequential operation. This wheel is not required for batch-fire when a missing-tooth crankwheel is used. The camwheel can be used whether or not the crankwheel has missing teeth.
With the MS2 and 3, higher toothcounts equal better spark accuracy, as the ECU will, in realtime, select the tooth which is closest to (but prior to) the calculated spark angle, and use that tooth as the trigger to launch the spark countdown timer. On the MS1, this feature does not exist. You can use any toothcount wheel that you wish, however you must specify a particular pair of teeth to be the trigger teeth, and these teeth must be far enough prior to TDC (and BDC) to accommodate the greatest possible spark advance. IOW, it is functionally equivalent to having a two-tooth wheel, with a phantom third tooth (the missing tooth) used for phasing. One exception does exist, in that during cranking, even the MS1 is capable of triggering on a specific, predefined tooth, as opposed to calculating all the way back from the "primary" trigger tooth.
A question: I understand that with the default configuration, the AEM is limited to a 12 tooth wheel. However I have come across some postings on various forii which suggest that it is possible to use more conventional wheel designs (such as 36-1) by setting up "tooth control table" which I don't quite understand. Examples:
36-1 teeth on the crank , 1 tooth on CAM
http://www.et.byu.edu/groups/icengin...ecognition.pdf
#4
Elite Member
iTrader: (10)
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,979
Total Cats: 356
MS2 can't go any higher than 60-2 because the sheer amount of interrupts per second cause the available mainloop time to decrease to dramatic levels. Simply put, there is not enough processing power in the MS2 to read a higher wheel than a 60-2. (From the top of my head, someone was trying to make it work with the starter teeth from a flywheel, IIRC 120 teeth.)
Jim
Jim
#5
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,046
Total Cats: 6,607
The 36-1 wheel, for instance, was a standard part of damn near everything Ford made for most of the 1990s, and as a result, is a de-facto standard in the aftermarket as well. Likewise, the 60-2 pattern was a common Bosch standard, and widely used by European OEMs around the same time period. There have been many other diabolically odd wheel patterns used by OEMs over the years, but I can't think of any which have a higher toothcount.
#6
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,046
Total Cats: 6,607
I've deleted a few posts and locked this thread for the moment at the request of the individuals who are doing the actual research on this concept. Please forgive me if this seems harsh, but I wish to respect their propriety until they choose to make a public announcement.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM
Frank_and_Beans
Supercharger Discussion
13
09-12-2016 08:17 PM