Forced Open loop thru ECUFlash
I'm really confused on what you're trying to accomplish. Are you trying to control your AFR at highway cruising speeds? Having your open loop tables that erratic will cause issues at non-WOT acceleration.
Why not just set all the open loop tables to like 10? That woul force open loop all the time. I have debating for rd open loop to see if I can get a better Maf scaling using the difference between actual afrs and fuel map. I know e en stock there not supposed to match but a nice constant would be nice.
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Evolving Member
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From: Lake Forest, California
The only way to know how it will work is to flash it and datalog the results. An Evo will see slightly higher loads at cruise than a Lancer will because of the turbo. Datalog and see if you stay within that range and see the results you're looking for.
for those interested, here is the method I used for this mod ...
1: Log load values in the cruising range where you want to go to open loop.
2: Lower the "Open Loop Load" tables (#2 is for a warm car, but I change both) to a load value just below the cruising load you logged.
3: Log RPM, Load and AFR in the appropriate range and adjust the fuel map as needed to achieve a 15.5:1 to 16.5:1 AFR at cruise.
The mod is simple, and it does work. I've used it myself and set up many Evos that are daily driven with the mod as well. If you spend significant time on the highway at speed, this mod WILL give you better fuel economy. A bit of warning though ... if you still have a cat on the car, it might not like the leaner cruising AFRs, so be aware it might fail prematurely.
Another option is to use the narrowband output from a wideband O2, such as the Innovate LC-1, to control the closed loop AFR value. Honestly, this method is more difficult to tune and AFRs tend to fluctuate a bit more, but it will give you a leaner closed loop AFR over the entire range rather than just a specific cruising range.
1: Log load values in the cruising range where you want to go to open loop.
2: Lower the "Open Loop Load" tables (#2 is for a warm car, but I change both) to a load value just below the cruising load you logged.
3: Log RPM, Load and AFR in the appropriate range and adjust the fuel map as needed to achieve a 15.5:1 to 16.5:1 AFR at cruise.
The mod is simple, and it does work. I've used it myself and set up many Evos that are daily driven with the mod as well. If you spend significant time on the highway at speed, this mod WILL give you better fuel economy. A bit of warning though ... if you still have a cat on the car, it might not like the leaner cruising AFRs, so be aware it might fail prematurely.
Another option is to use the narrowband output from a wideband O2, such as the Innovate LC-1, to control the closed loop AFR value. Honestly, this method is more difficult to tune and AFRs tend to fluctuate a bit more, but it will give you a leaner closed loop AFR over the entire range rather than just a specific cruising range.
for those interested, here is the method I used for this mod ...
1: Log load values in the cruising range where you want to go to open loop.
2: Lower the "Open Loop Load" tables (#2 is for a warm car, but I change both) to a load value just below the cruising load you logged.
3: Log RPM, Load and AFR in the appropriate range and adjust the fuel map as needed to achieve a 15.5:1 to 16.5:1 AFR at cruise.
The mod is simple, and it does work. I've used it myself and set up many Evos that are daily driven with the mod as well. If you spend significant time on the highway at speed, this mod WILL give you better fuel economy. A bit of warning though ... if you still have a cat on the car, it might not like the leaner cruising AFRs, so be aware it might fail prematurely.
Another option is to use the narrowband output from a wideband O2, such as the Innovate LC-1, to control the closed loop AFR value. Honestly, this method is more difficult to tune and AFRs tend to fluctuate a bit more, but it will give you a leaner closed loop AFR over the entire range rather than just a specific cruising range.
1: Log load values in the cruising range where you want to go to open loop.
2: Lower the "Open Loop Load" tables (#2 is for a warm car, but I change both) to a load value just below the cruising load you logged.
3: Log RPM, Load and AFR in the appropriate range and adjust the fuel map as needed to achieve a 15.5:1 to 16.5:1 AFR at cruise.
The mod is simple, and it does work. I've used it myself and set up many Evos that are daily driven with the mod as well. If you spend significant time on the highway at speed, this mod WILL give you better fuel economy. A bit of warning though ... if you still have a cat on the car, it might not like the leaner cruising AFRs, so be aware it might fail prematurely.
Another option is to use the narrowband output from a wideband O2, such as the Innovate LC-1, to control the closed loop AFR value. Honestly, this method is more difficult to tune and AFRs tend to fluctuate a bit more, but it will give you a leaner closed loop AFR over the entire range rather than just a specific cruising range.
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If he is only adjusting for the cruising loads only then it wont matter na or fi since pre boost our cars are essentially na then as soon as he hits boost he will drop his afrs down really quick. Although I too am intrigued as I read best fuel eco is obtained around 15.2?
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Evolving Member
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From: Lake Forest, California
If he is only adjusting for the cruising loads only then it wont matter na or fi since pre boost our cars are essentially na then as soon as he hits boost he will drop his afrs down really quick. Although I too am intrigued as I read best fuel eco is obtained around 15.2?
As far as EGT, 14.7 is actually the hottest burn. Either side of stoich will give you a cooler burn.
If you want to target 15.2, then tune for 15.2 on your wideband. But, I don't see why 15.2 is the "ideal" number as it's only slightly leaner than stoich. In closed loop operation, you'll bounce between 14.5 and 15.2 anyway.
I ran in the 16.2 range on the Evo for a long time with no issues and it did help fuel economy. I might actually go back to that as my mileage on E85 is horrible now.
If you want to target 15.2, then tune for 15.2 on your wideband. But, I don't see why 15.2 is the "ideal" number as it's only slightly leaner than stoich. In closed loop operation, you'll bounce between 14.5 and 15.2 anyway.
I ran in the 16.2 range on the Evo for a long time with no issues and it did help fuel economy. I might actually go back to that as my mileage on E85 is horrible now.
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For performance tuning should I disable this ??
And how do I disable it?
If I shouldn't disable it. What should I have it set too ??
And how do I disable it?
If I shouldn't disable it. What should I have it set too ??
for those interested, here is the method I used for this mod ...
1: Log load values in the cruising range where you want to go to open loop.
2: Lower the "Open Loop Load" tables (#2 is for a warm car, but I change both) to a load value just below the cruising load you logged.
3: Log RPM, Load and AFR in the appropriate range and adjust the fuel map as needed to achieve a 15.5:1 to 16.5:1 AFR at cruise.
The mod is simple, and it does work. I've used it myself and set up many Evos that are daily driven with the mod as well. If you spend significant time on the highway at speed, this mod WILL give you better fuel economy. A bit of warning though ... if you still have a cat on the car, it might not like the leaner cruising AFRs, so be aware it might fail prematurely.
Another option is to use the narrowband output from a wideband O2, such as the Innovate LC-1, to control the closed loop AFR value. Honestly, this method is more difficult to tune and AFRs tend to fluctuate a bit more, but it will give you a leaner closed loop AFR over the entire range rather than just a specific cruising range.
1: Log load values in the cruising range where you want to go to open loop.
2: Lower the "Open Loop Load" tables (#2 is for a warm car, but I change both) to a load value just below the cruising load you logged.
3: Log RPM, Load and AFR in the appropriate range and adjust the fuel map as needed to achieve a 15.5:1 to 16.5:1 AFR at cruise.
The mod is simple, and it does work. I've used it myself and set up many Evos that are daily driven with the mod as well. If you spend significant time on the highway at speed, this mod WILL give you better fuel economy. A bit of warning though ... if you still have a cat on the car, it might not like the leaner cruising AFRs, so be aware it might fail prematurely.
Another option is to use the narrowband output from a wideband O2, such as the Innovate LC-1, to control the closed loop AFR value. Honestly, this method is more difficult to tune and AFRs tend to fluctuate a bit more, but it will give you a leaner closed loop AFR over the entire range rather than just a specific cruising range.
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