DFI, Fuel/Utilities/Feedback option
Thread Starter
Melting Slicks
Joined: May 2001
Posts: 3,270
Likes: 26
From: Winchester VA
Cruise-In V Veteran
DFI, Fuel/Utilities/Feedback option
Any one know how to access it? No matter the condition, engine off key on, running at idle, driving, warm, cold, I cannot select it. It stays dim. The manual says what it does but does not say how to access it.
Any help here would be appreciated. O2 feedback stays at .751 and correction at 24.9 with closed loop control "ACTIVE". I read before that this was the menu I need to go into to bring it into check.
System is Gen 7 with accell w/b O2, at 900rpm, 180*, and 24* timing the AF ratio cell is 14.45, actual read is 13.45, but it smells like 11.45.
Any help here would be appreciated. O2 feedback stays at .751 and correction at 24.9 with closed loop control "ACTIVE". I read before that this was the menu I need to go into to bring it into check.
System is Gen 7 with accell w/b O2, at 900rpm, 180*, and 24* timing the AF ratio cell is 14.45, actual read is 13.45, but it smells like 11.45.
Le Mans Master
Joined: Jan 2003
Posts: 8,596
Likes: 19
From: Portland Oregon
Originally Posted by RainDelay
Any one know how to access it? No matter the condition, engine off key on, running at idle, driving, warm, cold, I cannot select it. It stays dim. The manual says what it does but does not say how to access it.
Any help here would be appreciated. O2 feedback stays at .751 and correction at 24.9 with closed loop control "ACTIVE". I read before that this was the menu I need to go into to bring it into check.
System is Gen 7 with accell w/b O2, at 900rpm, 180*, and 24* timing the AF ratio cell is 14.45, actual read is 13.45, but it smells like 11.45.
Any help here would be appreciated. O2 feedback stays at .751 and correction at 24.9 with closed loop control "ACTIVE". I read before that this was the menu I need to go into to bring it into check.
System is Gen 7 with accell w/b O2, at 900rpm, 180*, and 24* timing the AF ratio cell is 14.45, actual read is 13.45, but it smells like 11.45.
Former Vendor
Joined: Jun 2001
Posts: 7,204
Likes: 6
From: St Marys PA
Originally Posted by RainDelay
Any one know how to access it? No matter the condition, engine off key on, running at idle, driving, warm, cold, I cannot select it. It stays dim. The manual says what it does but does not say how to access it.
Any help here would be appreciated. O2 feedback stays at .751 and correction at 24.9 with closed loop control "ACTIVE". I read before that this was the menu I need to go into to bring it into check.
System is Gen 7 with accell w/b O2, at 900rpm, 180*, and 24* timing the AF ratio cell is 14.45, actual read is 13.45, but it smells like 11.45.
Any help here would be appreciated. O2 feedback stays at .751 and correction at 24.9 with closed loop control "ACTIVE". I read before that this was the menu I need to go into to bring it into check.
System is Gen 7 with accell w/b O2, at 900rpm, 180*, and 24* timing the AF ratio cell is 14.45, actual read is 13.45, but it smells like 11.45.
As TJ said you need the pro key.
If your 02 is reading .751 that means its pulling out the MAX of 25% to try to achieve your desired AFR- which is why your still smelling gas; its out of its range of correctible fuel.
You need to go to that cell in the VE table that its running in and trim that value by 75%(multiply it by .750). Then obvserve the 02 correction factor again. It should be closer to 1.00, like .92 (meaning its only trimming 8% of the fuel). Repeat this process for all driving conditions until your within 3% and your car is then tuned.
Values less than 1.00 are rich; and values greater than 1.00 are lean.
The value away from 1.00 in either direction is the amount in % its correcting that particular cell. Easiest thing to do is multiply that cell by the EXACT 02 correction factor. Or easier yet is use the autocal funtion- which does exactly the above described - but you should understand what that button is doing.
If you have any questions, let me know.
Thread Starter
Melting Slicks
Joined: May 2001
Posts: 3,270
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From: Winchester VA
Cruise-In V Veteran
Jesse, thanks. It was your response to Dave that I was reading. I haven't done much in the way of altering the calibrations set by the wizard as I'm still feeling my way around the screens. Took me a couple minutes to find the autocal key.
That explanation clarifies a lot about what it's doing. Basically, the wizard overestimated the efficiency in that operating range and therefore less fuel is required there. And too far off to fully correct.
I guess I can do the same for my cruising ranges. e.g. get cruising at 65, 70, 75 and adjust the cells that correspond. That should improve my MPG and such.
It may be a while before I get good track time to really play with WOT. At this rate, there will be new motor in the car before this one is ever tuned.
As I think this through, I have a question on the Acceleration Modifier. If it is at 1.20, does this mean it will add 20% more fuel to the current cell when under acceleration? I bring this up because I have a slight flat spot just off idle and it would make sense that if it is already rich, the modifier exxagerates the condition.
That explanation clarifies a lot about what it's doing. Basically, the wizard overestimated the efficiency in that operating range and therefore less fuel is required there. And too far off to fully correct.
I guess I can do the same for my cruising ranges. e.g. get cruising at 65, 70, 75 and adjust the cells that correspond. That should improve my MPG and such.
It may be a while before I get good track time to really play with WOT. At this rate, there will be new motor in the car before this one is ever tuned.
As I think this through, I have a question on the Acceleration Modifier. If it is at 1.20, does this mean it will add 20% more fuel to the current cell when under acceleration? I bring this up because I have a slight flat spot just off idle and it would make sense that if it is already rich, the modifier exxagerates the condition.
Thread Starter
Melting Slicks
Joined: May 2001
Posts: 3,270
Likes: 26
From: Winchester VA
Cruise-In V Veteran
Originally Posted by jerkyboy
Steve, bring it over and I'd be happy to ride along with you and work the keyboard while you drive!
Jesse, I found that if I hit autocal in a cell, that cell becomes so different than the neighboring cells that it almost stalls everytime the parameters change enough to put it in another cell. This does not surprise me with how far off it is. My solution has been to highlight an area and use the multiplier function. Using the formula you provided and what the autocal button does, I am really cleaning up the idle. It was always smooth, just rich. I even had to turn back the base idle screw on the TB
