Corrected Deadtimes still rich on lowest manifold pressure
Posted: Sun Jun 07, 2015 1:23 am
Alright so!, I have a
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Fuel Injector clinic 1000cc/min Injectors (i have them set to 858cc/min @ 39PSI fuel rail)
AEM high flow fuel rail.
AEM adjustable 1:1 FPR.
Walbro 255 Fuel Pump.
Hondata s300 v3(bluetooth).
garrett GT3076R dual ball bearing turbo.
b16A JDM motor/block.
stock bottom end, and GSR Cams.
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Idle set screw has been tweaked all the way to one side to get the idle to drop, when I unplugged the IACV(idle control valve) and the RPM's drop to 550, not 450 like advised by the help file, with the duty cycle at normal position in the idle tab, I've got the blue hondata intake gasket, and checked the manifold lines and there aren't any leaks before or after the throttle plate. (i'll be checking the IACV for crud tomorrow as it could be gummed up potentially, but as for the help file it said if you can't get 450 RPM there is a manifold leak, any tricky spaces to look where there might be leaks? any issues with the blue hondata intake gaskets not sealing at all?
THE SETTINGS
---------------------------------
I set the dead times for the fuel injector clinic injectors to the specified values, I'm running my fuel rail PSI at 39psi, which on the baseline data sheet for the injectors are rated at 858cc/min flow rate.
inputed stock injectors at 240cc/min in the calibration and the new size to 858cc/min,
followed a wicked set of instructions for setting dead times since the dead times I was given are giving me too rich* of a condition as my fuel value is set to like 1 with the recommended dead times, you'll see what I mean on my calibration.
Now for the question, I set the dead times to lower then whats recommended to get my -20.5Hg manifold pressure up to a fuel value of ~35 for any Rev's above 1000RPM, and they are a bit lower for my idle, @ 900Rpm. but now while I'm cruising and am at about 1% TPS I'm about 11.5 air fuel ratio's but as soon as I get into the -20Hg of manifold vacuum, it goes back to a perfect 14.4-14.9 air fuel ratio. the question I have is now that I've calculated the dead times (i set all low manifold pressures from 0 - 2000RPM the same fuel value, set idle to about 1500RPM and set the 14.16Volt dead time and then changed fuel when necessary to bring AFR values back to 14.0-14.2, then loaded the car circuitry with my amp/sub/music, headlights, fan, and wiper blades to get the 12.5v deadtime set) I should be able to change the dead time values to an even lower number for 14.16volts to effectively achieve a longer duty cycle but squirt the same amount of fuel as before with a lengthier dead time, or will this in turn create pools of fuel on the valves in the intake runner?
Conclusion!
--------------------------------
everythings set up perfect except -25.9 inch/Hg manifold pressure vs all RPM's. the lowest AFR i can get is 11.9 with a fuel value of 0, which is like 2% duty cycle on the injector there is practically no change.
SO ... should I decrease the dead times once again to effectively raise the duty cycles needed to squirt more fuel once I've reduced the dead times from say 0.87 to 0.77ms as I'm suspecting I'm needing to
or is there a way to add an overall time to the injectors duty cycle or "when" it squirts to how much it squirts to fix the issue, also I can't put in a negative overall trim as there is not enough duty cycle to trim.
also all my adjustments were made after the car had been warmed up, it's set to stock 16 Degrees for timing, and Map/TPS/IAT/ECT/IACV sensors are working great, only discrepancy is that my idle control screw is maxed to the right turn position.
EDIT
----------
side note, when I had the 14.16V dead time at say 0.6ms the car was stalling at 900RPM, So I raised the idle to 1500rpm and was able to dial in 0.87ms for the dead time, I'll be trying this method again tomorrow as I'm thinking I just needed way more duty cycle(fuel value increase) to compensate, and lowering the dead times to 0.6ms and will set the RPM to 1500 will report my findings if I'm able to add more duty cycle and getting the right amount of fuel for low manifold pressure, any info in the mean time would be great!
--------------------------------
Fuel Injector clinic 1000cc/min Injectors (i have them set to 858cc/min @ 39PSI fuel rail)
AEM high flow fuel rail.
AEM adjustable 1:1 FPR.
Walbro 255 Fuel Pump.
Hondata s300 v3(bluetooth).
garrett GT3076R dual ball bearing turbo.
b16A JDM motor/block.
stock bottom end, and GSR Cams.
--------------------------------
Idle set screw has been tweaked all the way to one side to get the idle to drop, when I unplugged the IACV(idle control valve) and the RPM's drop to 550, not 450 like advised by the help file, with the duty cycle at normal position in the idle tab, I've got the blue hondata intake gasket, and checked the manifold lines and there aren't any leaks before or after the throttle plate. (i'll be checking the IACV for crud tomorrow as it could be gummed up potentially, but as for the help file it said if you can't get 450 RPM there is a manifold leak, any tricky spaces to look where there might be leaks? any issues with the blue hondata intake gaskets not sealing at all?
THE SETTINGS
---------------------------------
I set the dead times for the fuel injector clinic injectors to the specified values, I'm running my fuel rail PSI at 39psi, which on the baseline data sheet for the injectors are rated at 858cc/min flow rate.
inputed stock injectors at 240cc/min in the calibration and the new size to 858cc/min,
followed a wicked set of instructions for setting dead times since the dead times I was given are giving me too rich* of a condition as my fuel value is set to like 1 with the recommended dead times, you'll see what I mean on my calibration.
Now for the question, I set the dead times to lower then whats recommended to get my -20.5Hg manifold pressure up to a fuel value of ~35 for any Rev's above 1000RPM, and they are a bit lower for my idle, @ 900Rpm. but now while I'm cruising and am at about 1% TPS I'm about 11.5 air fuel ratio's but as soon as I get into the -20Hg of manifold vacuum, it goes back to a perfect 14.4-14.9 air fuel ratio. the question I have is now that I've calculated the dead times (i set all low manifold pressures from 0 - 2000RPM the same fuel value, set idle to about 1500RPM and set the 14.16Volt dead time and then changed fuel when necessary to bring AFR values back to 14.0-14.2, then loaded the car circuitry with my amp/sub/music, headlights, fan, and wiper blades to get the 12.5v deadtime set) I should be able to change the dead time values to an even lower number for 14.16volts to effectively achieve a longer duty cycle but squirt the same amount of fuel as before with a lengthier dead time, or will this in turn create pools of fuel on the valves in the intake runner?
Conclusion!
--------------------------------
everythings set up perfect except -25.9 inch/Hg manifold pressure vs all RPM's. the lowest AFR i can get is 11.9 with a fuel value of 0, which is like 2% duty cycle on the injector there is practically no change.
SO ... should I decrease the dead times once again to effectively raise the duty cycles needed to squirt more fuel once I've reduced the dead times from say 0.87 to 0.77ms as I'm suspecting I'm needing to
or is there a way to add an overall time to the injectors duty cycle or "when" it squirts to how much it squirts to fix the issue, also I can't put in a negative overall trim as there is not enough duty cycle to trim.
also all my adjustments were made after the car had been warmed up, it's set to stock 16 Degrees for timing, and Map/TPS/IAT/ECT/IACV sensors are working great, only discrepancy is that my idle control screw is maxed to the right turn position.
EDIT
----------
side note, when I had the 14.16V dead time at say 0.6ms the car was stalling at 900RPM, So I raised the idle to 1500rpm and was able to dial in 0.87ms for the dead time, I'll be trying this method again tomorrow as I'm thinking I just needed way more duty cycle(fuel value increase) to compensate, and lowering the dead times to 0.6ms and will set the RPM to 1500 will report my findings if I'm able to add more duty cycle and getting the right amount of fuel for low manifold pressure, any info in the mean time would be great!