General Battery offset table

[hhuricane]

Does anyone have the battery offset table for a set of FIC 750cc injectors. I need them so I get my AEM EMS setup. FIC doesn't seem like they want give them out. I e-mailed them a few days ago and haven't received an answer. I'm hoping to get it running this weekend and need this.

 

[delta448]

18.7v = 0.336
16.35v = 0.504
14.0v = 0.72
11.68v = 0.792
9.34v = 1.296
7.0v = 2.04
4.7v = 3.312

http://forums.evolutionm.net/ecuflash/207924-injector-scaling-latecy-different-injectors-50.html#post6862069

 

[turboglenn]

The easiest way to set this table up if you don't have some one elses numbers (and it will vary from car to car) is to tune the idle to say 14.7 and turn the closed loop off.

Then turn the lights on and adjust that bar in the batt compensation map until you're back to 14.7, then turn on more and more accessories to bring voltage lower and lower and bringing the correction back up in the same manner.

This will give you a curve that you can linearize through the rest of the voltage areas.

 

[twdorris]

You have to keep in mind that latency data is relative to the drivers used to drive the injectors. So data from an EVO ECU is not likely to apply directly to an AEM unless they both use the same driver circuitry (which seems unlikely).

It's the same reason we (DSMers) have such a hard time getting usable latency data from injector testers. They simply have no way to test the injectors using our drivers from our ECU. It'd be great if someone worked with FIC to get them a setup based specifically on our ECU to test injectors with. I've offered before, but I just never have the time.

The procedure turboglenn mentioned is probably your best bet. I do something similar on this page just for illustration.

Thomas Dorris

 

[delta448]

You have to keep in mind that latency data is relative to the drivers used to drive the injectors.

I'm no programming whiz, but could someone explain this a little more in depth? Is this a conductivity or computation issue?

 

[Ceddy]

I'm no programming whiz, but could someone explain this a little more in depth? Is this a conductivity or computation issue?

The injector driver has its own internal deadtime and voltage drop that is added to the injectors. (It takes a fraction of a second to turn on, and not all the voltage you put in it makes it out)

There is even difference in the stock 450cc deadtime values in our metal case (90-97) and plastic case (98+) ECUs, because different types of drivers are used (Darlington and MOSFET).

 

[delta448]

Thanks Ceddy, I'd give you rep but the site software says I have to spread it around more. I hope someone who reads this post donates some to you for me.