Crank Angle Sensor type question

[mike kojima]

It's an infared LED shining through a round plate
driven from the distributoer shaft with a whole bunch
of slots blanked into it. The slots allow the light to
pass though to a CDS cell with some sort of op amp to
create a wave signal for the ECU, its not a hall or VR
sensor at all, which work by inductance to create the
signal.

I would not simply trust any non OEM wideband to
activly manage anything near WOT based on the wide
scatter of readings I experianced with my test.  I
would at least verify the readings against a known
reference.

I was shocked and dismayed with the results of my test
and how differently the different meters worked.

You NEED a crank angle signal for any stand alone ECU
to work, I don't understand why you think its not
needed.

If you wanted to you can simply use the crank angle
signal generated by the distributor and use it to run
a DIS system.  Or a nicer looking althernative is to
use a S14/S15 DET crank angle sensor in lieu of a
distributor.

I would be careful of many aftermaket DIS conversion
ideas, most of them are waste spark systems that fire
the plugs with every revolution and have a short dwell
time to saturate the coil.  I have found these to be
prone to missfire, although its been 20 years since I
messed with the first primative electromotive systems.

I sort of worry about how much understanding you have
to work this stuff based on some of the questions you
are asking or perhaps it is me not understanding you
properly.

--- Ben Fenner <fenfam at sc.rr.com> wrote:

> Yah, I realize it is the controller itself which
> makes or breaks the O2 
> sensor, but I'm going to put my trust in VEMS, and
> assume, at the very 
> least, that their digital WBO2 controller is halfway
> decent. I don't 
> plan on using race gas ever, so I don't have to
> worry too much about 
> fouling it up.
> 
> I've been reading through the factory service
> manual, and I found the 
> bit about the cam angle sensor. Like you said, it's
> optical, and has 360 
> degrees of resolution. So, that's the cam angle
> sensor. Awesome. But is 
> it a VR type, or Hall type? Wikipedia says:
> 
> So... our optical sensors are not Hall type. I
> guess. But are they the 
> VR type? Or something Nissan specific? I only ask
> because MegaTune has a 
> specific setting for Nissan type sensors... =/
> 
> After reading quite a bit about distributor and
> distributorless 
> ignitions, it seems there's no need for a crank
> angle sensor if you're 
> running a distributor. I plan on going to passive
> coil-on-plug ignition 
> after initially getting things working with the
> stock distributor. I'll 
> have to do something about crank angle sensing at
> that point. I may have 
> to build my own... But I'd rather not. How does the
> stock ECU get its 
> tach signal if its not using a crank angle sensor?
> From the ignition, 
> which is subsequently controlled by the cam angle
> sensor?
> 
> I'll keep looking for these answers, but if any of
> you know the answers, 
> just chime in. Also, do we know of anyone in the
> Nissan community who's 
> really familiar with these sort of things, or am I
> blazing the trail? I 
> guess Calum would know this stuff. Maybe it's time I
> hit the forums... =/



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