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New injectors scaling HELP

Old Sep 10, 2025 | 08:17 AM
  #1  
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New injectors scaling HELP. "SOLVED"

Hello, i have big problems scaling new injectors for many reasons:
- I can't log fuel trims, none of the 4, everything remains at 0
- I tried to work on open and closed loops for fuel but my actual tables are all set to 0 ,im always in closed loop?
-all my xml definition files are completely different from the ones stated in the ECU flash guide

I really can't do anything at the moment, can please somebody guide me in the process

Thank you very much

Luca

Last edited by Luca Bernardi; Sep 16, 2025 at 11:03 AM. Reason: SOLVED
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Old Sep 11, 2025 | 06:31 AM
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post a screenshot of your evoscan
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Old Sep 11, 2025 | 06:41 AM
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What injectors are you trying to scale?

You could try the scaling table in merlins tuning guide as a starting point, and then you can make adjustments
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Old Sep 11, 2025 | 01:27 PM
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Originally Posted by KK0ng
post a screenshot of your evoscan
thanks for the reply and sorry for the delay,
this is evoscan and ecuflash
main page
main page
edit of LTFT
edit of LTFT
one quick log with values at 0
one quick log with values at 0
thus is the openloop
thus is the openloop "problem" with the actual scaling, it work, but i can't make adjustments without LTFT
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Old Sep 11, 2025 | 01:32 PM
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Originally Posted by audiofan
What injectors are you trying to scale?

You could try the scaling table in merlins tuning guide as a starting point, and then you can make adjustments
Injectors are DW 800cc, i already have all the tables and everything, and are working "fine" but i can't log parameters for making the adjusments
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Old Sep 12, 2025 | 01:04 AM
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Originally Posted by Luca Bernardi
thanks for the reply and sorry for the delay,
this is evoscan and ecuflash
main page
main page
edit of LTFT
edit of LTFT
one quick log with values at 0
one quick log with values at 0
thus is the openloop
thus is the openloop "problem" with the actual scaling, it work, but i can't make adjustments without LTFT
LTFT sometimes doesn't populate until you actually drive the car for a short time (30 seconds or so)
for the logging in live tracer, you cannot have values set to Auto, you have to correctly define the values that match your tables from the dropdown menu, else you will get skewed data
but from my opinion you should only use LTFT to check the correction, and log AFR with a wideband and log the correction vs actual values to dial in scaling & overall base fuel calibration before moving to actual tuning

Last edited by KK0ng; Sep 12, 2025 at 01:14 AM.
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Old Sep 12, 2025 | 01:15 AM
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Originally Posted by KK0ng
LTFT sometimes doesn't populate until you actually drive the car for a short time (30 seconds or so)
for the logging in live tracer, you cannot have values set to Auto, you have to correctly define the values that match your tables from the dropdown menu, else you will get skewed data
but from my opinion you should only use LTFT to check the correction, and log AFR with a wideband and log the correction vs actual values
I tried various methods, disconnect battery on every new injector update, leave the car in idle for about 20 mins, a slow drive for about 15mins, but nothing...it does not show up LTFT...i read that can be the open/closed loop...can be also this in addiction of the dropdown menu?
I have a Wideband connected, and now in idle Is 13.0, thats why i wanted to correct a little bit, overall Is "decent" but running pretty rich

Last edited by Luca Bernardi; Sep 12, 2025 at 01:20 AM. Reason: More info
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Old Sep 12, 2025 | 02:05 AM
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13.0 (should be 14.5-14.7) would definitely overcorrect, are you getting o2 readings ? log your STFT and set your openloop throttle to 75, and load should not be % but load based that matches the load calc and set those to 120 ish (just at boost )
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Old Sep 12, 2025 | 02:56 AM
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Originally Posted by KK0ng
13.0 (should be 14.5-14.7) would definitely overcorrect, are you getting o2 readings ? log your STFT and set your openloop throttle to 75, and load should not be % but load based that matches the load calc and set those to 120 ish (just at boost )
I have just the front O2 sensor, the second Is deleted, later i will change the open loop settings and try again, i will update when i have news, thanks
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Old Sep 15, 2025 | 04:12 AM
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Originally Posted by KK0ng
13.0 (should be 14.5-14.7) would definitely overcorrect, are you getting o2 readings ? log your STFT and set your openloop throttle to 75, and load should not be % but load based that matches the load calc and set those to 120 ish (just at boost )
So, i made some work and searched around...since i don't have the rear O2, was disabled in the FEA Bits...i activated this and the O2 simulation in Tephra Tab...set up the open/closed loop in FAA bits...but still nothing LTFT don't show up, nether the STFT
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Old Sep 15, 2025 | 05:23 AM
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almost feels like an openport issue, can you try with an openport 2.0 connector?
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Old Sep 15, 2025 | 05:28 AM
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Originally Posted by KK0ng
almost feels like an openport issue, can you try with an openport 2.0 connector?
No at the moment, i need to eventually buy one...front O2 readings are shown...but now i saw something regarding the MAF Hz and LT...my values are 85 for low, and 1500 for high...and i think this can be the issue...my low Hz reading in idle Is around 35
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Old Sep 15, 2025 | 07:05 AM
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Originally Posted by Luca Bernardi
No at the moment, i need to eventually buy one...front O2 readings are shown...but now i saw something regarding the MAF Hz and LT...my values are 85 for low, and 1500 for high...and i think this can be the issue...my low Hz reading in idle Is around 35
Those are the actual parameters that i think prevent me to log LTFT
Those are the actual parameters that i think prevent me to log LTFT
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Old Sep 16, 2025 | 10:45 AM
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seems high, mine are usually around for LT trim control
57
44
1598
1591
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Old Sep 16, 2025 | 11:02 AM
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Originally Posted by KK0ng
seems high, mine are usually around for LT trim control
57
44
1598
1591
In fact this was the issue i think, i found some lower values on the forum and now everything is working properly, thanks to everybody, i will edit as solved
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