[Diy_efi] RE: Nissan KA24E ECU and CAS
Torbjörn Forsman
torbjorn.forsman
Wed May 10 21:06:12 UTC 2006
Please note that the limit of 3600 rpm only is a test condition for the
datasheet and that it is referred to the "reference target". Worst case
of those dimensions would be a wheel with 102 mm diameter and 25 teeth,
this will give an output signal of 1,5 kHz at 3600 rpm.
In most cases, with those teeth or notches that are used in practice, a
such sensor should perform well at much higher rpms.
The minimum tooth width of 2,54 mm would give a pulse width of about 130
us at 3600 rpm of the reference target. A good idea would be to design
the teeth so that the pulse width at maximum rpm always is more than 130
us. Or, as an alternative, obtain a sample of the sensor, make som test
wheels and try them out in a lathe or bench drill!
Best regards
Torbj?rn Forsman
Holt, Brent D PE431 wrote:
> Hi Hugh,
> I'm a newbie in the group... Just looking into doing some custom
> EFI set-ups for your typical junkyard turbo systems... Name is Brent.
>
> Anyway, I noticed on the spec sheet you attached that the sensor's max
> RPM is 3600. How do you plan to account for such a low rev?
>
> -Brent
>
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
> On Behalf Of hugh at sol.co.uk
> Sent: Tuesday, May 09, 2006 5:13 PM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] RE: Nissan KA24E ECU and CAS
>
> Mike,
>
> Thanks for your comments.
>
> The RB26 has a coil on plug set-up so plug lead interference is not an
> issue - although interference might be coming from somewhere else.
>
> I will check the ground.
>
> I have an M600 Motec ECU and the new V3 software has a REF and SYNC
> oscilloscope trace that you can look at which might tell me more.
>
> I am just finishing an install on a CDI system which may also alleviate
> things, but I think a hall sensor
> http://www.sol.co.uk/h/hugh/Ignition/Honeywell%20GT1%20hall%20sensor%202
> .pdf
> reading 18 clutch cap head bolts on the back of the fly wheel is
> probably
> the best answer.
>
> Thanks
>
> Hugh
>
>
> Interesting, this is rather different to the RB30 unit which
> has the same gaps per cylinder except tdc, I'll find my
> analyser traces somewhere - which show the pulse shape
> and number of pulses overlap to distinguish tdc from other
> cylinders. With the RB30 unit there are often reports of damage,
> unfortunately the EHT leads can lie against the CAS leads
> and any corona discharge (not a spark but a field effect) can
> impress noise on the signals - make sure you have a good
> separation between leads and check your ground connection on
> the CAS. On the RB30 unit there is an extra ground wire which
> goes to a spade on the body of the unit. it doesnt rely on the
> interface connector alone.
>
> rgds
>
> Mike
>
>
>
> At 02:20 AM 5/9/06, you wrote:
>
>>Here is a picture of the RB26 disc which looks pretty similar.
>>
>>http://www.sol.co.uk/h/hugh/Motec/RB26%20Trigger%20Disk.JPG
>>
>>I have a great deal of noise on my RPM trace and assume that it it
>
> caused
>
>>by cambelt harmonics probably made worse by high lift cams.
>>
>>Cheers
>>
>>Hugh
>>
>>Just email them to me Tom, my email address should be on the
>>top of your header, if not then here niche at iinet.net.au
>>
>>cheers
>>
>>mike
>>
>>
>>At 03:02 AM 5/6/06, you wrote:
>>
>>>How to mail a pic? I assume attachments will be stripped, so there's
>
> an
>
>>FTP somewhere? I just took pics, not awesome ones, but between John's
>
> link
>
>>and the pics, some useful info should be gleaned. In case it doesn't
>
> come
>
>>through, there is a fat slit in the CMP (sorry for the ISO terms vs.
>
> Nissan
>
>>ones, it's a habit!) portion of the wheel, which identifies cylinder
>
> #1. I
>
>>have had an oil-fouled interrupter plate not fire the injectors every
>
> time
>
>>the blocked hole came around, so I know the inner ring of holes is used
>
> to
>
>>trigger the injectors.
>>
>>>TomV
>>>
>>>Mike wrote:
>>>
>>>
>>>>Suggest email us a picture, because this sounds so much like the
>>>>RB30 CAS and I have done a study of that one, there is no cam
>>>>control but there are two lots of pulses which overlap to signal
>
> tdc...
>
>>>>rgds
>>>>
>>>>mike
>>>>
>>>>
>>>>
>>>>At 12:00 AM 5/5/06, you wrote:
>>>>
>>>>
>>>>
>>>>>1. Yup. Fought one for a while; dealt with the same problem on an
>>
>>Altima, and similar problems on the VG30 which has the same setup.
>>
>>>>>2.
>>>>>3. No extra or missing slits; the 360 slits are actually for the
>
> crank
>
>>angle sensor and the four slits, spaced inboard of those, are for the
>
> cam
>
>>sensor (cylinder ID,) with one being wider then the others. The signal
>>conditioner makes the outputs into square waves. There is no dead
>
> space in
>
>>the ring of 360.
>>
>>>>>
>>>>>John Smith1882 wrote:
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>>1. Do you know that for sure?
>>>>>>2. n/a
>>>>>>3. I know all about the sensor except what the conditioning circuit
>>
>>does. Does it just "clean up" the rounded square wave signal from the
>>optical sensors, or something else? On the 360 slots, is there a dead
>
> space
>
>>like the #1 injector window?
>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Date: Wed Apr 26 15:48:43 CDT 2006
>>>>>>>From: Tom Visel five10man at commspeed.net Subject: RE:Nissan KA24E
>
> ECU
>
>>and CAS
>>
>>>>>>>To: diy_efi at diy-efi.org
>>>>>>>
>>>>>>>
>>>>>>>1. ECU will get all sorts of stupid without CAS. Anything from
>
> not
>
>>running at all to limp-in.
>>
>>>>>>>2. Don't know.
>>>>>>>3. 360 slots, photocoupler-read, conditioning circuit inside the
>>
>>distributor.
>>
>>>>>>>
>>>>>>
>>>>>>_______________________________________________
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>>>>>>Diy_efi at diy-efi.org
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>>>>>>
>>>>>>
>>>>>
>>>>>_______________________________________________
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>>>>>
>>>>
>>>>
>>>>
>>>>Regards from
>>>>
>>>>
>>>>Mike Massen
>>>>Network Power Systems
>>>>Lab 08 9444 8961
>>>>Mb 0438 048961
>>>>Perth, Western Australia
>>>>* VL/VK Commodore Fuse Rail that wont warp or melt !
>>>>* Skyline/NIssan/VL Milspec ignition driver in development
>>>>* Twin tyres for most sedans, trikes and motorcycle sidecars
>>>>* Industrial grade PolyVinyliDeneChloride (PVDC Copolymer) in bulk,
>
> the
>
>>best
>>
>>>>oxygen and water protective barrier you can find for circuit boards.
>>>>Web site under construction http://niche.iinet.net.au
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>>>>
>>>>
>>>
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>>
>>
>>Regards from
>>
>>
>>Mike
>>Perth, Western Australia
>>VL Commodore Fuse Rail that wont warp or melt !
>>Twin tyres for most sedans, trikes and motorcycle sidecars
>>http://niche.iinet.net.au
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>
>
>
> Regards from
>
>
> Mike
> Perth, Western Australia
> VL Commodore Fuse Rail that wont warp or melt !
> Twin tyres for most sedans, trikes and motorcycle sidecars
> http://niche.iinet.net.au
>
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