Let me start by saying I am a COMPLETE newbie when it comes to ECUflash. I downloaded my stock 04 ROM, adjusted injector scaling to 914, latency @ 14.06 to .960ms, and uploaded the ROM to the ECU. The car starts and stalls, and I can keep it running with my foot on the gas, but it is pig rich, around 10.5 on the WBO2. Swapping back to my DSMlink ECU the car starts and runs normally. I am assuming that I have missed something with setting up the compensation for my injectors.

I also verified the ROM uploaded by re-reading it from the ECU and checking the scaling and latency, they are correct.

A quick rundown on the car:

FIC 950 injectors
HKS 280 cams
FP Green
3" TBE

That should be all that is relevant to this.

Any advice would be greatly appreciated, as I need to slowly start whittling away at getting readiness tests to pass.

 

well that scaling was for precision 1000's not FIC 950's. I would try using the injector latency found in this thread:

https://www.evolutionm.net/forums/sh...jector+scaling

specifically post #74

as far as actual scaling try around 850 or so to start with for those.

 

So just from my general reading on this forum I have noticed that for whatever injectors people seem to be running they have to set the scaling lower than the injector...why is that? Is it that the table is just incorrectly labeled in ECUFlash?

 

The injector scaling value is a rough estimation of injector size, its really a global scaling value that is used for roughing in. Combine that with the latency settings and you can get your closed loop fuel trims in check without having to make major changes to the fuel table. Once you get close to where you want, then you can make adjustments.

Basically, if you get these scaling parameters set properly, then your fuel maps which have that arbitrary AFR value as its adjustment value, should roughly correlate to the actual AFR.

 

Thank you for the link John. I was using the PTE 1000 settings since in my experiences with DSMlink, they are damn near identical with the FIC950's.

I started with the FIC 950 settings in the post you linked me to, and the car goes from being horrendously rich to being horrendously lean. I dicked with the scaling settings from about 750 to 914 but could not get things right. Does anybody with experience with these injectors have some settings that are close from real world usage?

 

Ah ok...thanks MJ

 

It sounds like you have the tools and information to get it dialed in, keep trying injector cc settings until you get it right and put the recommended latencies in.

 

Still playing with settings for these injectors. I think one of my main errors was not having a MDP sensor working properly. I was running a GM 3.3 bar sensor for DSMlink through the MDP line. Changed that back to the factory MDP and although I believe I have to start over retuning these injectors, the car appears to be more stable.

I was always under the impression the MDP sensor was only used to monitor EGR performance, but it seems the ECU may use it for more than that. Can anybody expand on what the ECU uses the MDP for?