Thread: Aem ems ignition/injector phasing

This is because there is major differences, one being one is COP and the other is distributor and single coil. There are major differences in setup. One being the spark tooth count, one is 24 for COP and the other is divided by 4 for 4 sparks per revolution so it has a spark tooth count of 6 to trigger spark 4 times per cycle evenly split.

Ok then more than likely your ignition sync is wrong and you need to set your timing with a timing light while cranking. Turn off the injectors so they are not firing when doing this. If your getting sync then its just a setting thats off.

Thanx Ashton for ur reply..can u send me ur base cal.when u were running the hall sensor.. if u still have it....

Dont have it sorry. It was the same as Rocco's and the Mazworx sheet, the ignition phasing was slightly different but the initial setup they gave got the car to start. I am running and AEM twinfire cdi box as well so thats the reason it changed some.

Yeh I know the differences between the two. My question is not on cam/crank settings or ignition settings, its on the injector phase value and why the value has to change from what's in the base calibration when using the 24-1 cas disk. I used those two images to show that they ask you to change the injector phase when using 24-1 disk on both the cop and distributor setup. But neither of those are relevant to our fwd (distributor using) sr20's. Is everyone that's using aem on a fwd sr20(w/distributor and 24-1 disk) leaving their injector phase at either 4 or 14? Because according to aem instructions the ka guys and rwd sr20 guys must change there injector phase when going to 24-1 disk...

Its because of differences in the distributor and where the disk sits in relation to TDC. That is why there is a difference in the phasing numbers between pretty much each vehicle.

I think (and may be wrong) the DE has 14 so the fuel can sit on the hot valves longer and vaporize more since its NA....

And when you say phasing you're referring to injector phasing right? Because what you're describing sounds like setting ignition phasing

No, thats delayed vs having 7. The higher the number the more delayed the firing of the injector.

I was referring to ignition. But it works the same way. Plus differences in the motor design.