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Thread: Spark blow-out / break up and bucking from 2.5k-4.5k rpm (custom AEM EMS install).

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Posts: 41-50 of 50
2009-12-22 20:05:11
#41
Sounds like you guys are probably intimately familiar with this aspect of AEM's limitations. =]

Is your cam trigger wheel a missing tooth design? (Just wondering how crank position is determined.)
2009-12-22 21:36:46
#42
It has rare earth magnets installed around the gear that bolts to the factory exhaust gear and the hall sensor picks up the signal.

It allows you to change from the factory sensors in the distributor/cas to a more precise digital signal from this sensor. Many aftermarket ecus read the Hall signal much better than they do the oem signal from the distributor/cas. A lot of times you'll notice a smoother idle & much smoother power at high rpm. This also allows complete removal of the factory distributor/cas when a multi channel CDI box & individual coils are used with it.
2009-12-22 21:38:25
#43
What CAS disc is in the 20V?
anyone tried that one?
2009-12-22 21:44:42
#44
The 20V CAS disc is going to be just like all the other Nissan ones. 360 slots on the outside, 4 on the inside, and problematic to say the least.

Mazworx, you didn't say if your cam wheel is "missing tooth" or not. I assume it would have to be?
2009-12-22 21:46:23
#45
Originally Posted by unijabnx2000
What CAS disc is in the 20V?
anyone tried that one?


It's your standard Nissan Opto 360 disc. Similar, if not the same, to the disc in the dizzy of other SR20's

2009-12-22 22:55:15
#46
Originally Posted by BenFenner
The 20V CAS disc is going to be just like all the other Nissan ones. 360 slots on the outside, 4 on the inside, and problematic to say the least.

Mazworx, you didn't say if your cam wheel is "missing tooth" or not. I assume it would have to be?


Its read and sync
2009-12-22 23:15:07
#47
So you have a trigger wheel on the exhaust cam and the crankshaft?

You also mention its digital. Please be careful as to your use of this term. Digital is often misused. The OEM trigger signal is digital by nature. Hall Effect sensors are not digital by nature, they require conditioning to resemble a on/off digital signal.

I would really like pictures of your setup.
2009-12-23 00:31:39
#48
Originally Posted by mazworxsales
Its read and sync
So you have a crank trigger wheel too, or you run batch ignition/injection, or?
2009-12-23 14:43:22
#49
This is not something new. Its been used for years. Especially for the Honda guys. I personally ran this setup about 5 years ago on my drag Integra. It provides the cleanest and most stable signal in higher horsepower applications and hi-reving apps.

You will only use it on the exhaust side of the cam gear. I have some pictures but not a lot.

Here is the cam wheel that bolts onto your stock exhaust gear with rare earth magnets installed.



Here is the hall sensor on the head.



This is how its used on Honda's



Once we have the head off the race car, should be able to get some better pics.
2009-12-23 14:50:56
#50
That explains it all. It's an "added tooth" design. That install on the SR is a lot cleaner than I was expecting. For some reason I was envisioning it on the other side of the engine where the FWD distributor is.

Thanks for the info!
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