Reply to "Atomic EFI vs. FAST EZ-EFI 2.0"

I do agree i think the ability of the user to tune the system (whatever it is) is of great importance.

Many "self tune" systems rely on oxygen sensor information to adjust fuel/air ratios to achieve a almost constant 14.7:1 ratio.

This may allow the car to "run" but it is probably not going to run as well as it could.

Also these systems are designed by engineers that have the 350 Chev mindset and so fuel curves and spark curves, for those systems that control both, are tailored to "fit" the characteristics of the more common smallblock Chev and not the 351C.

You must have the ability to adjust the system to compensate for this.

I also do recommend a fuel return line fuel system with a pressure relief valve style fuel regulator.

This can be a pain to put in but once it's done it's there and can prevent all manner of vapour lock issues by supplying cool fuel from the tank all the time.

Also use a Bosch fuel injector pump. The pumps that come with these EFI setups are cheap trash and they fail in short order leaving you stranded.

Bosch make a stack of pumps and there will be one that is spot on for your use.

0 580 254 044 is the part number of the pump i've used for MPEFI, it flows up to 200 litres per hour and working pressure of 5 bar (approx 73 psi). The regulator will of course drop the pressure to whatever is required for the injectors you are using.



The issue of altitude may be a ongoing problem for you. Selection of the right type of control will be a big consideration in your circumstances.

Here in Australia it's not a issue as Australia is almost completely flat and there is little altitude change on any road you can drive on.

The systems i've used would not compensate for the 10,000 ft altitude change that you have and would require manual adjustment as your car climbed up from sea level, just like the engineer in a pre-computer aircraft would have to do constantly adjusting the fuel mixtures as the planes altitude changed.

Curiously carburettors being a device that uses air flow and air density to initiate fuel flow tend to compensate for altitude change more easily than EFI systems. That is not to say automotive EFI systems can't do it but it is necessary to factor that feature in when designing the system and as most cars don't fly the designers tend not to worry about it.

You may notice that many automotive EFI systems come with a warning "not to be used on aircraft" this is because altitude change can be a problem for them.

Something to look into......