Updated injector data

[BroPeep]

Hey everyone,

I have received what I think is "more correct" injector data curtesy of FIC for these Deka60s.

Question is, do you think its worth updating to it and redoing the VE table, which I have been tuning and likely compensating for the old data with?

Car is running decently right now, only issue I have is occasional lean tip in. Its still a little lean in closed loop so I can fatten the table up.

Current tune and new injector data -
660cc_FIC_Deka60_Short_03242022 (1).xlsxJune18_Old_Injectors.hpt

[gametech]

It really is a personal choice based on how happy you are with the way it runs now vs how much time it will take to redo it. I have seen tunes that were hacked all to hell, but the specific motor combo ran pretty good, so no need to fix them at the time. When it really makes a big difference is when you make part changes that affect the tune. Then the stuff that has been changed to account for incorrect data makes retuning far more time consuming.

edit-- Also, incorrect data can make the calculations that account for weather changes inaccurate, so every time the temperatures swing you have people complaining of hard starts and AFR problems.

[BroPeep]

Thank you - that's a refreshing answer.

I guess there is no way to know that the new data is anymore 'right' than what I am using.

Idle and low throttle AFRs went up to about 18:1 before I went back to the old data, so I would need to probably add a good 30% to the VE table and go from there which seems rather high?

[gametech]

Thank you - that's a refreshing answer.

I guess there is no way to know that the new data is anymore 'right' than what I am using.

Idle and low throttle AFRs went up to about 18:1 before I went back to the old data, so I would need to probably add a good 30% to the VE table and go from there which seems rather high?

On an even more discouraging note regarding how to know which data is "more correct", I am willing to bet none of the test benches bring the injectors up to typical underhood temperatures before testing. I have no idea how much difference it makes, but electrical resistance typically goes up with temperature increases, and would have to have some effect on the opening speed of the injectors vs voltage.

[RDF1]

On an even more discouraging note regarding how to know which data is "more correct", I am willing to bet none of the test benches bring the injectors up to typical underhood temperatures before testing. I have no idea how much difference it makes, but electrical resistance typically goes up with temperature increases, and would have to have some effect on the opening speed of the injectors vs voltage.

Also fuel temperature is under a pretty wide operating range. I put temp sensors on some vehicles and its crazy how hot the fuel gets.

[gametech]

Also fuel temperature is under a pretty wide operating range. I put temp sensors on some vehicles and its crazy how hot the fuel gets.

I am still a bit miffed about the fact that the alcohol content sensor I added to my car can report fuel temp as well, but the pcm can't read it.

[gtstorey]

I would be surprised if the flow rate changes much with temp. It seems like once you get to things with the viscosity of water or less then the temperature doesn’t affect it much.