Injector scaling and latecy for different injectors.
Mar 7, 2009, 09:17 PM
#706
Evolved Member
Here is a set of three that should be good, all the owner/tuners report good results.
From fostyou:
Scaling=680
4.7V = 3.642
7.0V = 1.992
9.4V = 1.344
11.7V = 0.984
14.0V = 0.744
16.4V = 0.576
18.6V = 0.456
From joedr:
Scaling=713
4.7V = 3.504
7.0V = 2.184
9.4V = 1.224
11.7V = 0.960
14.0V = 0.792
16.4V = 0.552
18.6V = 0.432
From cpoevo:
Scaling=696
4.7V = 3.504
7.0V = 1.872
9.4V = 1.224
11.7V = 0.960
14.0V = 0.774
16.4V = 0.552
18.6V = 0.432
As you can see, not much variation.
If it was me, I'd use cpoevo's settings and see what happens.
From fostyou:
Scaling=680
4.7V = 3.642
7.0V = 1.992
9.4V = 1.344
11.7V = 0.984
14.0V = 0.744
16.4V = 0.576
18.6V = 0.456
From joedr:
Scaling=713
4.7V = 3.504
7.0V = 2.184
9.4V = 1.224
11.7V = 0.960
14.0V = 0.792
16.4V = 0.552
18.6V = 0.432
From cpoevo:
Scaling=696
4.7V = 3.504
7.0V = 1.872
9.4V = 1.224
11.7V = 0.960
14.0V = 0.774
16.4V = 0.552
18.6V = 0.432
As you can see, not much variation.
If it was me, I'd use cpoevo's settings and see what happens.
Last edited by merlin.oz; Mar 8, 2009 at 06:17 PM.
Mar 9, 2009, 09:13 AM
#708
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How far off is this?
PTE 880s
scaled at =860
3.312
2.088
1.224
0.912
0.744
0.552
0.456
Fuel Trim Low = -4
Fuel Trim Mid = -4
I started with scaling 770 referencing the scaling instructions on page 5. Am I retartded or am I way off. Also just installed 10.5 Hotside, EPM O2 dump and Forge Wastegate. Wideband is idling at 15.8 - 16.4. Never did this before, and it idles smooth (WoW). Curise AFR is like 14.4 - 15.4 which I am happy with. WOT is like 12.5 now, wastegate pressure 19-20lbs, which I know I have to go back to tune the fuel table.. What makes my wideband do this. Im pretty sure no exhaust leaks..
PTE 880s
scaled at =860
3.312
2.088
1.224
0.912
0.744
0.552
0.456
Fuel Trim Low = -4
Fuel Trim Mid = -4
I started with scaling 770 referencing the scaling instructions on page 5. Am I retartded or am I way off. Also just installed 10.5 Hotside, EPM O2 dump and Forge Wastegate. Wideband is idling at 15.8 - 16.4. Never did this before, and it idles smooth (WoW). Curise AFR is like 14.4 - 15.4 which I am happy with. WOT is like 12.5 now, wastegate pressure 19-20lbs, which I know I have to go back to tune the fuel table.. What makes my wideband do this. Im pretty sure no exhaust leaks..
Mar 9, 2009, 10:14 AM
#709
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How far off is this?
PTE 880s
scaled at =860
3.312
2.088
1.224
0.912
0.744
0.552
0.456
Fuel Trim Low = -4
Fuel Trim Mid = -4
I started with scaling 770 referencing the scaling instructions on page 5. Am I retartded or am I way off. Also just installed 10.5 Hotside, EPM O2 dump and Forge Wastegate. Wideband is idling at 15.8 - 16.4. Never did this before, and it idles smooth (WoW). Curise AFR is like 14.4 - 15.4 which I am happy with. WOT is like 12.5 now, wastegate pressure 19-20lbs, which I know I have to go back to tune the fuel table.. What makes my wideband do this. Im pretty sure no exhaust leaks..
PTE 880s
scaled at =860
3.312
2.088
1.224
0.912
0.744
0.552
0.456
Fuel Trim Low = -4
Fuel Trim Mid = -4
I started with scaling 770 referencing the scaling instructions on page 5. Am I retartded or am I way off. Also just installed 10.5 Hotside, EPM O2 dump and Forge Wastegate. Wideband is idling at 15.8 - 16.4. Never did this before, and it idles smooth (WoW). Curise AFR is like 14.4 - 15.4 which I am happy with. WOT is like 12.5 now, wastegate pressure 19-20lbs, which I know I have to go back to tune the fuel table.. What makes my wideband do this. Im pretty sure no exhaust leaks..
Here are the steps to make it better.
1. Choose a global setting (ECUFlash injector scaling number)
2. Log trims at idle and cruise
3. If trims are roughly the same, but positive, then you need to increase your global fueling, or in terms of ECUFlash, you need to lower your injector scaling number.
4. If both trims are roughly the same, but negative, then you need to descrease your global fueling, or in terms of ECUFlash, you need to raise your injector scaling number.
5. If idle trim is more positive than cruise trim, then you need to increase the dead time, or in terms of ECUFlash, you need to increase the latency value.
6. If the idle trim is less positive than the cruise trim, you need to decrease the deadtime, or in terms of ECUFlash, you need to decrease the latency value.
Note: After #5 or #6, you may need to readjust #1 accordingly.
To speed up the process with an VIII you will need to disconnect the battery, try to start the car and reconnect the battery to remove any residual memory. Each time you make a change this will need to be done. The 9s don't have this issue.
Mar 9, 2009, 05:48 PM
#710
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Thanks to Appauldd for the insite on reseting the ECU. It made the world of difference..Opinons on the current scaling..
PTE 880s scaled at 790
3.312
2.088
1.224
1.008
0.768
0.648
0.456
Idle = +1
Cruise = -2
O2 Feedback = fluxes between .0 and +2 or +3
Also found the problem with the wideband..Turbo manifold exhaust leak. I have ordered a gasket..
Do I need to go and add some latency to bring the idle down?
PTE 880s scaled at 790
3.312
2.088
1.224
1.008
0.768
0.648
0.456
Idle = +1
Cruise = -2
O2 Feedback = fluxes between .0 and +2 or +3
Also found the problem with the wideband..Turbo manifold exhaust leak. I have ordered a gasket..
Do I need to go and add some latency to bring the idle down?
Last edited by evo082006; Mar 9, 2009 at 05:49 PM. Reason: added contenc
Mar 9, 2009, 06:47 PM
#713
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Thanks to Appauldd for the insite on reseting the ECU. It made the world of difference..Opinons on the current scaling..
PTE 880s scaled at 790
3.312
2.088
1.224
1.008
0.768
0.648
0.456
Idle = +1
Cruise = -2
O2 Feedback = fluxes between .0 and +2 or +3
Also found the problem with the wideband..Turbo manifold exhaust leak. I have ordered a gasket..
Do I need to go and add some latency to bring the idle down?
PTE 880s scaled at 790
3.312
2.088
1.224
1.008
0.768
0.648
0.456
Idle = +1
Cruise = -2
O2 Feedback = fluxes between .0 and +2 or +3
Also found the problem with the wideband..Turbo manifold exhaust leak. I have ordered a gasket..
Do I need to go and add some latency to bring the idle down?
If you are staying within +/- 5% on LTFT and STFT you are golden.
Mar 9, 2009, 07:06 PM
#714
Evolved Member
+1 on Appauldds comments.
Sorry I forgot the 2.
Whats happening is the overall scaling of 790 is a bit out, but you cant get it to the exact "right" number.
So, its a bit of a compromise, but you are damm close.
Sorry I forgot the 2.
Whats happening is the overall scaling of 790 is a bit out, but you cant get it to the exact "right" number.
So, its a bit of a compromise, but you are damm close.
Mar 11, 2009, 07:16 AM
#717
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How much is your STFT swinging? If it is a ton....you might need to adjust your global scaling a bit since both fuel trims are -. You wantthe STFT to hover +/- 5.
Here are the steps to make it better.
1. Choose a global setting (ECUFlash injector scaling number)
2. Log trims at idle and cruise
3. If trims are roughly the same, but positive, then you need to increase your global fueling, or in terms of ECUFlash, you need to lower your injector scaling number.
4. If both trims are roughly the same, but negative, then you need to descrease your global fueling, or in terms of ECUFlash, you need to raise your injector scaling number.
5. If idle trim is more positive than cruise trim, then you need to increase the dead time, or in terms of ECUFlash, you need to increase the latency value.
6. If the idle trim is less positive than the cruise trim, you need to decrease the deadtime, or in terms of ECUFlash, you need to decrease the latency value.
Note: After #5 or #6, you may need to readjust #1 accordingly.
To speed up the process with an VIII you will need to disconnect the battery, try to start the car and reconnect the battery to remove any residual memory. Each time you make a change this will need to be done. The 9s don't have this issue.
Here are the steps to make it better.
1. Choose a global setting (ECUFlash injector scaling number)
2. Log trims at idle and cruise
3. If trims are roughly the same, but positive, then you need to increase your global fueling, or in terms of ECUFlash, you need to lower your injector scaling number.
4. If both trims are roughly the same, but negative, then you need to descrease your global fueling, or in terms of ECUFlash, you need to raise your injector scaling number.
5. If idle trim is more positive than cruise trim, then you need to increase the dead time, or in terms of ECUFlash, you need to increase the latency value.
6. If the idle trim is less positive than the cruise trim, you need to decrease the deadtime, or in terms of ECUFlash, you need to decrease the latency value.
Note: After #5 or #6, you may need to readjust #1 accordingly.
To speed up the process with an VIII you will need to disconnect the battery, try to start the car and reconnect the battery to remove any residual memory. Each time you make a change this will need to be done. The 9s don't have this issue.
Thanks!
Mar 13, 2009, 05:48 PM
#719
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re read through the thread you'll find your answers there.
First load a stock fuel map in your high octane ( if you havent done so)
then start entering the latency values and scale your injectors to 750 -/+ see how that treats you....make sure your car is outta closed loop before you start watching your trims. Try mistulogger, for me its was alot easier to read.
Im running 1000cc injectors and have actually had some good luck
Scaled to 860
With the latency values that the my injectors call for on the table.
i have pretty good driveability, consider my cams and VTA BOV so my trims alittle off at crusing at idle they are dead on though. thats the point.
@ cruising they are +/- 11 So i have some minor tuning to do to my fuel map at that point, maybe mess around with the latency alittle more but im almost pretty happy with what i got. Good luck guys feel free to ask more questions.
First load a stock fuel map in your high octane ( if you havent done so)
then start entering the latency values and scale your injectors to 750 -/+ see how that treats you....make sure your car is outta closed loop before you start watching your trims. Try mistulogger, for me its was alot easier to read.
Im running 1000cc injectors and have actually had some good luck
Scaled to 860
With the latency values that the my injectors call for on the table.
i have pretty good driveability, consider my cams and VTA BOV so my trims alittle off at crusing at idle they are dead on though. thats the point.
@ cruising they are +/- 11 So i have some minor tuning to do to my fuel map at that point, maybe mess around with the latency alittle more but im almost pretty happy with what i got. Good luck guys feel free to ask more questions.
Is this correct that you should start with a Stocker Fuel map to scale injectors?
Mar 14, 2009, 06:27 AM
#720
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ok i ended up using razorlabs 636 scaling but FIC 750's latency and i raised the 14 volt latency a tad, i ended up with 0.1 LTFT Low and a 0.8 LTFT Mid, heres the issue these are used injectors so idk if maybe im going crazy or somethings wrong but i have them maxed out in ecuflash at 7.4 and im still running 12.3 to redline at only 22psi