J&S ecu for 5kT

[Ameer Antar]

I don't really know for sure how the J&S works, but I thought it was it's 
own autonomous ignition system, and does not rely on the oe ecu for 
anything. The reason I thought this is b/c it requires a rpm input, and you 
can apply it to cars w/o ecu's.

I thought the j&s creates the timing itself. In that case, I don't know how 
it comes up w/ a timing map. But if it simply just retards timing, then it 
would make sense, but its only use would be for more sensitive knock 
control. Anyone have the J&S and knows for sure which way the unit is? 
Thanks again.

-ameer
...MAC-07 ecu

oh ya, and I think if you just put a resistor [equiv. to the Bentley spec 
for knock sensor] across the ecu's knock sensor inputs, the ecu would think 
everything is fine...


> > The only thing I don't understand is how the J&S makes a timing map. Can
> > you program a map that is adjusted by the knock signal? What does this map
> > look like? The thing that bothers me about the ecu, is it does not use any
> > sensors but knock sensor to figure out advance. The oe Hitachi ecu uses
>
>It doesn't need to figure advance, just retard.  It sits between the
>OEM ECU and the coil/booster.  If it hears knock, it retards the
>cylinder next time around.  Which incidently, is how the 3B ECU
>works - a second CPU takes the ignition signal and delays it if
>knock has been detected.
>
>It should work fine with the MAC11, though you would need to
>disable the OEM knock sensor...  Not as simple as just disconnecting it...
>that would throw error codes AND give you an across the board retard!
>
>Orin.