Im willing to bet thats what it is...

on your 1350 start up there is a big jump units

18 179
46 152

and im assuming your coolant temp is probably like in 30F's on cold start up.

your 1350's cold start up is very lean.

like you said on your stock injectors, it will start lean then when it gets warmer the AFRs start to come back down to 14.7(were they should be)

on your stock maf vs coolant, the numbers on the right decrease slowly until the coolant temp get to around 100s the way it should be.

 

SD has to have the scaling changed to reflect the displacement change....least how I set it up but I'd think its fairly global. I.e. if you had a scaling of injector scaling of 1008, the 16.6% difference between the 2.0 and 2.4 would mean the scaling has to drop to 840.

2.0 / 2.4 = 0.833
1008 x 80% = 839.6

I normally do 0.800 and leave it a little on the rich side until I have it tuned.

 

Im hoping he had everthing scaled in before! it was my impression that he had the 2.4 dialed in already then decieded to rebuild it.

 

yes it was driving on the scaling i have now. i just have to finish my tuning on that rom once i get the injectors idleing which i wasnt able to get to do today because my turbo to manifold bolts decided to back themselves out on the way home so i spent the daylight hours fixing that...smh....so i will adjust the maf comp vs collant temp as you said and try that out tomorrow when i have the time to swap out the injectors and not wake everyone in my apartment complex with my straight 3" ams turbo back

 

Whoops, misread it. Sorry. I thought it was driving on the 2.0l then switched to the 2.4. I see now it was already on the 2.4L.

aaron

 

Cool man let us know how it does when you change the MAF vs coolant table

just curious..... You in the army?
Reason I ask is because I'm active duty AF

 

Yes I was already driving on this rom but thanks for the input as im sure that will help someone else down the line who reads this thread

 

yea.... im no longer active but I am a dual status mil-tech now and work on Fort Dix in NJ

 

He posted his ROM, I'm sure if you scrub through it and suggest tweaks, OP won't mind your words of advice and your opinion are valuable to the tuner world.

 

Did you drive on the 1350 FIC rom during the cold winters with cold start ups? Or is this the first winter for the 2.4l 1350 FIC tune?

 

this is the first winter...last time i drove on the rom it was late summer early fall. so hopefully me changing the settings you told me to will let me get those injectors in and idleing

 

Yup that points to that table I suggested you change.

 

The whole map is set rich by the injector scaling but lean by the RPMVE and MAPVE compared to how I tune normally.

As others have stated I would adjust the MAF Comp vs coolant. My default setting there is 200 at -26 like you have it, set it to 140 at 122* and interpolate inbetween. That should be 10 steps per temp axis.

Next question as I wasnt clear on it, the pumps both run 100% of the time? If so is this on a stock regulator and return line? If its on an aftermarket regulator can you verify base fuel pressure? Has any of the fuel system changed since you took it apart as far as how this functions?

aaron

 

Yes both pumps are always on and its on the stock fuel lines, stock rail, and stock fpr. The double pumper is the only new mod since I drove on these injectors.

 

You are over running the regulator by 35psi. The coil of the injector cant open against the head pressure and the car idles dead lean...opposite of what you would think would happen.

Choice is wire the second pump on a hobb, wire the pumps to the factory wiring so that the 9v-14v crossover works at idle.

Then proceed to tune.

Not sure why it didnt do this to you last year but it should have been.

Aaron