John McGraw or anyone else that ran EFI in their SRIII (or other) cars

[bossvette]

John
What electronics did you use, I noticed you said sequential injection.

Mac
speed density systems use a MAP sensor (Manifold absolute pressure) instead of a MAF (Mass Air Flow) along with the TPS and temp sensors. Many of the aftermarket systems are speed density and the fuel map can be done on a laptop. My 76 has a Holley system which is batch fire (it fires one bank and then the other) instead of sequential which injects the fuel timed to the Camshaft one cylender at a time. When I did my 76 back in 99 the few sequential systems were about 4 times the cost of the Holley(just for electronics) so altho I would have liked sequential cost among other things dictated the batch fire system.

 

[JohnZ]

John
What electronics did you use, I noticed you said sequential injection.

The box was developed by Altair Engineering (my buddy was their Chief Engineer), and most of the sensors were standard off-the-shelf items. The only major adaptation items were the cam and crank sensors in order to have it sequential.

 

[Mac]

Mac
speed density systems use a MAP sensor (Manifold absolute pressure) instead of a MAF (Mass Air Flow) along with the TPS and temp sensors.

The EFI system which I adapted onto my wife's Jeep uses a MAP sensor as opposed to a MAF along with a gang of other sensors so I expect it's a speed density system. Since I was robbing it off of another, newer Jeep, I didn't have to figure out how everything worked... I just made sure it did. The crank position sensor was a PITA since the system was designed to have the CPS on the flywheel (and I didn't want to change flywheels) but I got a front crank adaptor which works like a charm!

-Mac