I’m working on trying to get an in-ecu mod that will deliver a TRUE peak and hold injector driver. So instead of using resistors to just limit the injectors to only 1A, it will peak at 4A, then hold at 1A like peak and hold injectors are meant to run (like the FJO injector driver does). This will make it a lot easier to tune large injectors easier for people using ecu hacks like crome, ectune, hondata, ect. All I need is to locate a 5v output inside the ecu. I don’t know if there is one, but if there is please tell me where it is located.

Thanks in advance.

 

The injectors are 12v positive constant.. The ECU send a ground to complete the circuit and make the inj pulse its not grounded constant and the ECU sends voltage. You want to get rid of the resistor box under the hood try running inline resistors with your injector wires A1, A3, A5 and A7. Even if you can find something that will complete the ground for you its not going to alternate and cause the injectors to pulse when needed based off the crank angle sensor off the distributor.

 

I know that I can use resistors to run low impedence injectors I'm not dumb. It works but not how it is suposed to. They call peak and hold injectors because they are suposed to have a peak of 4a to open them and then idle at 1a untill they close. Resistors just make the injectors run at 1a always so big injectors have truble oppening crisply, so when at partial throttle and idle they run like crap. that is the reason people with big injector usually run 1200rpm or highr idles.

 

Something tells me that if you can't find a clean, constant 5v source inside your ECU, you don't have what it takes to correctly set up an IC1949 circuit.

 

Its not that I can not find one but that I don't know what one would support the current being drawn. Almost every sensor in the ecu uses 5v. But what one would be better? Just because I don't know every thing about a Honda ecu does not mean I can not soldier a circut board.

 

You only need 5v for the 1949 chips. The injector source current only flows through the darlington transistors.

FYI, you'll need 4 chips to control all 4 injector channels. That makes a pretty beefy board:



It just doesn't seem practical to fit it inside the ECU.

 

If the 1.1a board will not fit the 2.0 board will. The 1.1a is on will be on its way on Monday, so we will se how it works.