EZ EFI conversion on 76 with CIS

[otto_kretschmer]

has anyone tried replacing their CIS with one of the aftermarket EFI kits?

I've noticed that a few companies including Holley and a place called EZ EFI sell kits for hot rodders.

are there any good reasons to dump the stock CIS for an aftermarket EFI?

one day I'll get to rebuilding the motor on my 76 911S.

it still has to pass smog, so tinkering with the fuel injection system may be opening up a can of worms

FAST EZ EFI systems

[trond]

Bitz Racing has an excellent, affordable kit for the 911. I have it and will recommend it to anyone struggling with the old CIS system
Numerous threads here on the forum if you want to try the search function
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[otto_kretschmer]

I noticed on my 944 and a lot of other cars from the 80s have really long intake runners and I think I've heard that all injectors fire at the same time on the 944

when I did the clutch on my 944 I noticed there was a flywheel trigger, I'm going to guess that the 944 fired its injectors all at once and at every revolution, so each injector pulse would give half the gas

I'm kinda shaking my head on which one is really better; single point or multipoint fuel injection

I drive like a blue hair granny so I doubt I would notice any difference

[Lapkritis]

Batch vs. Sequential fuel injection are the common terms used. Batch or semi-sequential injector control is relatively less sophisticated and cheaper to manufacture and control than a sequential system. To operate fully sequential fuel injection you would need a camshaft position sensor which is sometimes fitted to the intermediate shaft where the distributor would be. The benefits of sequential fuel injection is emissions control, fuel economy and some performance gain... less wall intake wall wetting and more complete burn due to better mixing of the fuel with air. This is mostly due to injector timing and pulse width control... you can also tune each cylinder individually. An EGT sensor and wideband sensor on each exhaust port with a sequentially controlled engine will allow you to optimize all 6 cylinders individually rather than tuning the collective dumping of the single tail pipe as many OEM and even aftermarket systems do... you can tune each cylinder to compensate for differences in intake runner length, fuel injector flow balancing, hot cylinders due to cooling design etc... the list goes on.