[Diy_efi] Pulsing a K-jet cold start injector?

[urq]

... the main problem for me is that the CSI is not optimally placed in the 
manifold to ensure even distribution of fuel to the cylinders ... here 
again, all I know about are Audis ... perhaps BMW put a bit more thought tot 
the placement of the CSI ... but I doubt it.

As others have noted, Audi did pulse the CSI for hot start mode on the CIS 
turbos ... IME the pulse rate is measured in seconds, or at least 
significant fractions thereof.

I'm not so sure I agree with the comment that the CSI is built up just like 
a pulsed injector for EFI ... I'm sure the spray is not optimized as a 
modern EFI injector is, and the coil for the electromagnet is much larger 
... meaning much higher inductance ... meaning not easy to make it work very 
fast ...

If you're looking for ditching the CIS look to see if some newer models of 
your car had EFI ... for the Audi folks the newer 90 series models had EFI 
with the 5-cylinder engine, as did the EuroVan ... some folks use this as 
their basis for the transition.  If all you're looking for is fuel, a 
MegaSquirt kit might be a good start ...

Steve B
San Jose, CA (USA)
----- Original Message ----- 

On Tuesday 31 January 2006 16:07, Torbj?rn Forsman wrote:
>
> Anyway, i don't think the long-term reliability of a such injector in
> pulsed mode would be a problem. Probably, the interior parts are
> identical to a normal Bosch injector.

Hmmm ... that would be great ....

Let's see, reality check of my idea:

I'm on the way of converting an '82 323i BMW from a half-dead K-jetronic FI 
to
EFI using a 1227727 ECM.... but until I get an EFI manifold from an E30, I
was thinking of installing the ECM, the sensors, tune the k-jet fuel
regulator lean, and supply the rest of the fuel via the cold start injector
as a "TBI" injection.

Does this sound a workable idea?