Speed density tuning issue on initial take off high fuel trim

[hiwiredjuice]

Hello and good morning.
I seem to be having an issue with my tune and cant seem to figure it out.

When taking off from first starting the engine the fuel trims are requesting to add a ton of fuel but after driving a couple seconds then the vehicle starts taking fuel away and starts running better.
This happens also when stopped sometimes for a period of time.

the ltft's are starting to look much better then when i first started i just dont know what to adjust to fix the initial take off issue. attached is the log you can see the issue at 3min40 ish.

Thanks in advance

greatsdstart3.hpl

[LilSick]

the cam goes to full retard by 1500

is it stock?

[hardeet]

post your tune.

[hiwiredjuice]

the cam goes to full retard by 1500

is it stock?

This is not stock this is a 5.7 with a 6.4 cam in it from what ive been told i should take the tables from a 6.4 change the exhaust vvt on the 5.7 and subtract 10deg from the tables.
Attached is the tune.greatsdtunestart3.hpt

[3dodgechick]

is it boosted ? I thought I saw Map as high as 120?

who suggested -10 on the cam table ?

[edcmat-l1]

I don't see any O2s in the data log. And the IAT is reading -83. Either it's a pid selection problem or a real sensor problem.

You're logging a bunch of stuff you don't need to log. Makes weeding through the data more difficult. It can also slow the scanner sample rate down. I'd get rid of at least half of what you're logging. Get rid of ALL the misfire pids. You don't need to monitor any of them unless you feel like it has a misfire and you're trying to diagnose it. You don't need to data log catalyst temp. Totally useless unless you're looking for a catalyst related problem.

Narrow it down to just the pids for basic fuel and spark tuning.

At 9:17 in the log the MAP goes to 121 Kpa.

Would be nice to know what we're looking at. I hate guessing.

businessman-looking-into-crystal-ball.jpg

[hiwiredjuice]

I don't see any O2s in the data log. And the IAT is reading -83. Either it's a pid selection problem or a real sensor problem.

You're logging a bunch of stuff you don't need to log. Makes weeding through the data more difficult. It can also slow the scanner sample rate down. I'd get rid of at least half of what you're logging. Get rid of ALL the misfire pids. You don't need to monitor any of them unless you feel like it has a misfire and you're trying to diagnose it. You don't need to data log catalyst temp. Totally useless unless you're looking for a catalyst related problem.

Narrow it down to just the pids for basic fuel and spark tuning.

At 9:17 in the log the MAP goes to 121 Kpa.

Would be nice to know what we're looking at. I hate guessing.

businessman-looking-into-crystal-ball.jpg

Thank you I will remove some of the items being recorded. The iat that is reading -83 is a incorrect pid i just havent removed it yet. I have added another iat which is correct.

The build is 5.7 hemi with a 6.4 cam and springs from 6.4 with shorty headers nothing else.
I think i have the high fuel trim issue sorted now. I believe it was the ve at 200%. I dont know why it was set that way. But i just turned neural network back on and adjusted injector timing which is working ok.
My high rpm seems to be ok now but i do have some mid range performance issues now around 2-4k.
Im not sure if the advice about the cam data is correct or not.
So from what ive been reading after you do a 6.4 cam in a 5.7 you copy the exhaust vvt from a stock 6.4 past to the 5.7 tune and -10 from every table in vvt exhaust.
Thats kinda where im at right now with it. I am seeing some knocks on the scanner im not sure if they are fake knocks or not because it doesnt always knock at those cells all the time.

This is my latest tune and log.


greatvetostock-INJADJ-4---GREAT9.hptGREATVETOSTOCK-INJ9-short.hpl

[f.creek-ranch]

Something is wrong, 43 kpa at idle and 120 at wot is not corrcet. 30 and 100 would be ok.

The PCM 5.7/6.4 are different, so the calibration is about -10 deg.

In my opinion the springs from the 5.7 and 6.4 are the same at your model.

[hardeet]

correcting your cam timing will help a ton with your VE. with my 6.4 cam swap i had a similar issue and i fixed it by changing the cam timing to about 123 just of idle and interpolated it to about the 114 cells and that corrected my crazy VE errors in that area