2jzGTE 12 tooth crank + 1 cam wheel decoder setup

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2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby shaodome » Tue Dec 28, 2010 12:22 pm

So a buddy of mine is building a car for the 24 hours of Lemons race next week and we are using a MK3 Supra Shell with a 2jzgte engine laying around in the shop.

The MS is actually a spectre unit, but it does have dual VR decoding circuits on board as well as some later varient of MS1Extra. My question is in regards to the wheel decoder setup for Generic wheel.

The crank has a 12 tooth evenly spaced wheel and there are two separate (G1 and G2) cam signals triggered off a notch in the cam (none of which are adjustable). G1 triggers when piston 6 is at TDC and G2 triggers when piston 1 is at TDC. On MS2 extra I run off NE and G2 with the tooth offset angle set at 0 and the car runs great.

I have no idea what to set the Trigger A, B C and their returns to for this though...same with the trigger angle. Any advice?
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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby shaodome » Tue Dec 28, 2010 12:25 pm

I haven't found too much in the 7m threads either yet....

I was figuring for MS1, that this would have to be set as a 24 tooth wheel since it is spinning at crank speed + 1 cam.
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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby jsmcortina » Tue Dec 28, 2010 12:57 pm

Six cylinder ? Wasted spark ?

If yes, then you need to combine the two G sensors and specify 12 teeth. I don't know on the triggers except they will be 4 teeth apart.

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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby shaodome » Tue Dec 28, 2010 2:48 pm

jsmcortina wrote:Six cylinder ? Wasted spark ?

If yes, then you need to combine the two G sensors and specify 12 teeth. I don't know on the triggers except they will be 4 teeth apart.

James


Correct, it is an inline 6 in wasted spark. Why couldn't I set it as 24 teeth and just use the single G2 signal?
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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby jsmcortina » Tue Dec 28, 2010 2:49 pm

Because it won't work?

MS1 is too "dumb" to support that configuration.

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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby shaodome » Tue Dec 28, 2010 3:02 pm

jsmcortina wrote:Because it won't work?

MS1 is too "dumb" to support that configuration.

James


wait...something must be getting lost in translation here. I know MS1 can do this, I've run 6+1 on my Mazda KL setups for years now. On the v6 with firing order 1,2,3,4,5,6 I was able to set it as follows:

Trigger angle = 60
Trig a = 1
trig return a = 2
trig b = 3, etc etc

Kinda like how this shows in the manual: http://msextra.com/doc/ms1extra/MS_Extr ... 2nd_VR.GIF

I'm not running COP, just 3 spark outputs.

The problem i'm wondering about is either the G1 or G2 in regards to the trigger angle?
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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby Matt Cramer » Tue Dec 28, 2010 3:06 pm

shaodome wrote:
jsmcortina wrote:Because it won't work?

MS1 is too "dumb" to support that configuration.

James


wait...something must be getting lost in translation here. I know MS1 can do this, I've run 6+1 on my Mazda KL setups for years now. On the v6 with firing order 1,2,3,4,5,6 I was able to set it as follows:

Trigger angle = 60
Trig a = 1
trig return a = 2
trig b = 3, etc etc

Kinda like how this shows in the manual: http://msextra.com/doc/ms1extra/MS_Extr ... 2nd_VR.GIF

I'm not running COP, just 3 spark outputs.

The problem i'm wondering about is either the G1 or G2 in regards to the trigger angle?


That's because a KL can use "rising and falling" mode and trigger on both ends of the cam sensor. The equivalent here is tying both G sensors together.
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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby pimp4lyphe » Wed Apr 06, 2011 11:53 am

I'm also trying to set up a toyota 24+1 distributor with MS1Extra, i need to know where to send the 2nd trigger input?

Thanks.
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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby jsmcortina » Wed Apr 06, 2011 11:59 am

Did you read the MS1/Extra manual for second trigger ?

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Re: 2jzGTE 12 tooth crank + 1 cam wheel decoder setup

Postby pimp4lyphe » Wed Apr 06, 2011 12:30 pm

jsmcortina wrote:Did you read the MS1/Extra manual for second trigger ?

James


can't find it
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