12 tooth crank trigger settings? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 08-01-2010, 04:41 PM   #1
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Default 12 tooth crank trigger settings?

Hey guys...

I just bought a 12 tooth wheel to use with my AEM on my 94.
Can anyone who is using this wheel share their cal file?
I know I need to set the fuel teeth to 12, the ign range to 1.5 teeth... what else?
FWIW, I plan on using the OEM 1994 4-tooth cam/crank sensor for sync. Do I need to mod the cam sensor too?

Many thanks

Last edited by lukydvll; 08-01-2010 at 04:51 PM.
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Old 08-01-2010, 07:52 PM   #2
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fuel teeth = 24

Ign range is 90*, which is 3 teeth, not 1.5.

There are several other setting which have "teeth" as units. For example MAP sensor filtering now needs to be at 6. Also check (IIRC) dwell MAX, which now should be 5 teeth.

No need to mod the cam sensor. Be sure you are moving the CKP signal to the crank, and not the CMP signal.

The cam/crank setup needs to be changed in many other ways.
More later.

Last edited by JasonC SBB; 08-01-2010 at 08:08 PM.
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Old 08-01-2010, 08:49 PM   #3
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OP; where did you buy the wheel?

Thanks
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Old 08-01-2010, 08:57 PM   #4
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Quote:
Originally Posted by Rafa View Post
OP; where did you buy the wheel?

Thanks
Probably here :http://trackspeedengineering.com/sto...1e072ed89e74dc
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Old 08-01-2010, 10:06 PM   #5
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Quote:
Originally Posted by dstn2bdoa View Post
Thanks
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Old 08-01-2010, 11:15 PM   #6
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Thanks for the reply Jason.
I see... 720 degrees of crank = 24 teeth per engine cycle.
So I could trigger the coils (wasted spark) at say, 0 and 12 teeth, and fire the injectors at 0, 6, 12, 18 teeth... correct?

Another question. Should I be triggering on rising edge only with this new 12-tooth wheel?

Oh, it is the trackspeed piece.
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Old 08-02-2010, 12:12 AM   #7
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Quote:
Originally Posted by lukydvll View Post
Thanks for the reply Jason.
I see... 720 degrees of crank = 24 teeth per engine cycle.
So I could trigger the coils (wasted spark) at say, 0 and 12 teeth, and fire the injectors at 0, 6, 12, 18 teeth... correct?

Another question. Should I be triggering on rising edge only with this new 12-tooth wheel?

Oh, it is the trackspeed piece.
Good questions OP.

I'm sure Jason will post additional info. He said it in his post.
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Old 08-02-2010, 01:28 PM   #8
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Before I make a mistake, I will wait for J_Man to post up his cam/crank setup, because he's had his 12T wheel running.

Mine will be a modification of his, as I will be modding it into a 12-1, due to my VVT.

P.S. The tooth table should be all 5's from 0 to 23, then a 3 at 24, then all 0's.
For a 12-1 it should all 5' from 0 to 11, then 3, then 0's.
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Old 08-03-2010, 12:50 PM   #9
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If anyone is looking for this info themselves, J_Man posted the settings needed to use the 12-tooth wheel here:

http://forum.miata.net/vb/showthread...43#post4688943


Thanks for the help people
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Old 08-14-2010, 02:00 PM   #10
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I ground a tooth off to get a 12-1 to work with my VVT, and it started and idled.
More later.
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