EFI with SPIF?

[Jim Pearl]

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There is one company that makes an aftermarket Knock Sensor that claims =
to retard the cylinders individually. It includes a meter showing the =
amount of retard and an optional A/F meter as well. The Electromotive =
computers look pretty good with VERY powerful software, however the =
software is pretty ridiculously priced for the average car nut like =
myself. A shop maybe, but not a tinkerer - too bad, if it weren't for =
that I'd have one on my car now. They're local to me too and I'm told =
they're good people. I can tell you a bit more about them if you're =
interested..

While we're on the subject, anyone have any idea as to the best way to =
make a "knock meter" similar to the MSD unit for a GM knock sensor ala =
Buick GN? The GM GN sensor appears to be the same as my DFI sensor =
including the little add-on processor that sits in the engine =
compartment. Even something as simple as a tri-color LED to indicate =
low, medium, and high knock would be fine. I'd like something other than =
my laptop or the stutter my car makes to indicate when the sensor is =
indicating knock. Perhaps even a way to disconnect it from the DFI and =
just drive the LED(s) would be good...=20

Would the MSD unit possibly work in conjunction with mine maybe? it =
doesn't appear to use the second processor..

Thanks!

----------
>From: 	Derrick Early[SMTP:early at finite.nrl.navy.mil]
Sent: 	Thursday, January 18, 1996 1:19 AM
To: 	diy_efi at coulomb.eng.ohio-state.edu
Subject: 	RE: EFI with SPIF?

> Check out the new DFI Sequential box, I'm pretty sure it does this. =
=3D
> There old boxes were some sort of batch fire but did do knock sensing =
- =3D
> I have one of these on my Mustang..

Thank you for the reply Jim.  I talked to the guys at Electromotive. =20
They said that they can make their TEC-II do SPFI, but they asked
why would you want to do that.  They normally do a phased squirt of
two injectors at a time for a 4 cyl engine.  In other words the
injectors are fired when its piston is at the top of its stroke.

I asked if their knock control scheme retards all four cylinders, and
they said yes.  They haven't allowed for the control of the timing
for each of the cylinders like Bosche does.  He suggested that I
shouldn't be tuning so close to knock anyways.

Yours,
--
Derrick Early
early at finite.nrl.navy.mil




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