[Diy_efi] RE: Nissan KA24E ECU and CAS

[Scott Peitzsch]

Not to state the obvious, but if its a cam sensor, won't it be turning
at half the engine speed?  Meaning, its good to 7200RPM at the
crank?  Or, is this an OHC motor with cams that are geared 1:1
to the crank?  I'm an SBC/BBC guy, so my knowledge of ANYTHING
with overhead cams is just about nil.

-Scott

----- Original Message ----- 
From: "Torbj?rn Forsman" <torbjorn.forsman at gengas.nu>
To: <diy_efi at diy-efi.org>
Sent: Wednesday, May 10, 2006 5:06 PM
Subject: Re: [Diy_efi] RE: Nissan KA24E ECU and CAS


> 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