Power FC lets talk about fuel settings
#1
built my own engine
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lets talk about fuel settings
so how many diff ways can you alter fuel with the PFC
injector screen:
you can set sizes, delays
injector map:
it seems to have two axis, one for RPM, one for pressure...
question is, what are the pressure figures? 24000 is the max, what is 24000 (in units of measurement?)
do you ever alter this section?
PIM voltage:
you can set percentages for RPMs....does this control basic fuel injection?
meaning, if i see my wideband readout, and i'm running lean from 4500rpms up, can i just go 100%+ in these areas to make those parts richer? is it just for WOT?
how do you richen up certain areas of your RPM band on WOT? why isnt' this thing as user friendly as the S-AFC?
injector screen:
you can set sizes, delays
injector map:
it seems to have two axis, one for RPM, one for pressure...
question is, what are the pressure figures? 24000 is the max, what is 24000 (in units of measurement?)
do you ever alter this section?
PIM voltage:
you can set percentages for RPMs....does this control basic fuel injection?
meaning, if i see my wideband readout, and i'm running lean from 4500rpms up, can i just go 100%+ in these areas to make those parts richer? is it just for WOT?
how do you richen up certain areas of your RPM band on WOT? why isnt' this thing as user friendly as the S-AFC?
#2
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Good questions all. I just installed my PFC and plan on the wideband next. It would be a huge help if someone with the knowledge to would scrap the crappy instruction manual and write a good one.
Tom
Tom
#3
Yeah, that would be awesome if someone had the time. And make it sticky. It seems that most of the questions are answered somewhere on this forum, but doing the right searches to find the good info takes forever. I'll be getting a wideband soon myself, and I'm starting to run into these questions...like how the hell do you EVER get all the non WOT cells correct....
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Re: lets talk about fuel settings
Originally posted by 93BlackFD
question is, what are the pressure figures? 24000 is the max, what is 24000 (in units of measurement?)
question is, what are the pressure figures? 24000 is the max, what is 24000 (in units of measurement?)
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I shouldn't even respond to your immature post, but since you're too lazy to read the damn manual I'll hold your hand...
What is a Pressure Value?
If the pressure value is [20000], it is equal to 2.0 kg/cm2 of absolute pressure. Atmospheric pressure is about [10000] of pressure value.
What is a Pressure Value?
If the pressure value is [20000], it is equal to 2.0 kg/cm2 of absolute pressure. Atmospheric pressure is about [10000] of pressure value.
#7
FD title holder since 94
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With just the commander, you can add or subtract fuel (not changing the injector sizes) using the PIM voltage based on RPMS or Map sensor voltage. Both are universal so if you have time, it best to try and make changes in the fuel correction map. And that is the 3rd way with the commander, in the fuel correction map....cell by cell to the ones you are trying to tune, not necessarily every cell.
If your lean fron 4500 up, you'd want to atleast add fuel in the PIM RPM page
to 102% so that it adds fuel in those rpm ranges. You could also add fuel using the map sensor voltage adjustment. If you know the voltage of when your at 4500 rpms and see what voltage is at that rpm, you could then add fuel so that it only adds fuel when your under boost. If your lean, up the value over 100%, if you were rich as hell, you'd lower it under 100%.
Look for the e-mail soon, I kept getting knocked off line with all the bad weather lately, not to mention me just hanging up and shutting down when the lightning hit a house up in our subdivision.
Tim
If your lean fron 4500 up, you'd want to atleast add fuel in the PIM RPM page
to 102% so that it adds fuel in those rpm ranges. You could also add fuel using the map sensor voltage adjustment. If you know the voltage of when your at 4500 rpms and see what voltage is at that rpm, you could then add fuel so that it only adds fuel when your under boost. If your lean, up the value over 100%, if you were rich as hell, you'd lower it under 100%.
Look for the e-mail soon, I kept getting knocked off line with all the bad weather lately, not to mention me just hanging up and shutting down when the lightning hit a house up in our subdivision.
Tim
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#8
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That's funny as the manual does a fair job of describing all of this and even more.
P20 abs pressure values per row.
P21-22 for fuel correction.
P24 PIM fuel by voltage and by rpm.
P25-26 injector size and lag.
P29 acceleration fuel.
P30 temperary fuel correction.
P31 fuel by water temp.
P32 cranking fuel.
P33 deceleration fuel cut.
P37 O2 control.
You can learn so much by comprehensive reading.
Try it sometime!
P20 abs pressure values per row.
P21-22 for fuel correction.
P24 PIM fuel by voltage and by rpm.
P25-26 injector size and lag.
P29 acceleration fuel.
P30 temperary fuel correction.
P31 fuel by water temp.
P32 cranking fuel.
P33 deceleration fuel cut.
P37 O2 control.
You can learn so much by comprehensive reading.
Try it sometime!
#9
built my own engine
Thread Starter
eh, my apologies
the physical copy of the manual i received seems to be missing several pages, i now have the PDF printed out, it's much easier
thanks for the information
the physical copy of the manual i received seems to be missing several pages, i now have the PDF printed out, it's much easier
thanks for the information
#10
Glad everyone's playing nice now....
I personally understand HOW to change things, just lack a good solid grasp on tuning, I suppose. I understand the basics...you get on a dyno, make a WOT run, and then adjust the associated cells accordingly. But then do you just guess and blend the cells around it? Do you do non-WOT runs? Ultimately I want to hard mount a wideband, so do you just keep making runs trying to hit each cell at varying throttle? Seems like it would be very possible to have good WOT cells but have a dangerously lean spot somewhere else.
Then timing is a whole new beast. I'm used to 70's piston cars where you twist the distributor till you hear the pinging and then back off a hair!
Maybe there's a good resource out there that someone can recommend? I don't mind reading, but unfortunately recently I haven't had the time to sift through all the marginal posts to find the good ones.
I personally understand HOW to change things, just lack a good solid grasp on tuning, I suppose. I understand the basics...you get on a dyno, make a WOT run, and then adjust the associated cells accordingly. But then do you just guess and blend the cells around it? Do you do non-WOT runs? Ultimately I want to hard mount a wideband, so do you just keep making runs trying to hit each cell at varying throttle? Seems like it would be very possible to have good WOT cells but have a dangerously lean spot somewhere else.
Then timing is a whole new beast. I'm used to 70's piston cars where you twist the distributor till you hear the pinging and then back off a hair!
Maybe there's a good resource out there that someone can recommend? I don't mind reading, but unfortunately recently I haven't had the time to sift through all the marginal posts to find the good ones.
#11
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Originally posted by cewrx7r1
That's funny as the manual does a fair job of describing all of this and even more.
P20 abs pressure values per row.
P21-22 for fuel correction.
P24 PIM fuel by voltage and by rpm.
P25-26 injector size and lag.
P29 acceleration fuel.
P30 temperary fuel correction.
P31 fuel by water temp.
P32 cranking fuel.
P33 deceleration fuel cut.
P37 O2 control.
You can learn so much by comprehensive reading.
Try it sometime!
That's funny as the manual does a fair job of describing all of this and even more.
P20 abs pressure values per row.
P21-22 for fuel correction.
P24 PIM fuel by voltage and by rpm.
P25-26 injector size and lag.
P29 acceleration fuel.
P30 temperary fuel correction.
P31 fuel by water temp.
P32 cranking fuel.
P33 deceleration fuel cut.
P37 O2 control.
You can learn so much by comprehensive reading.
Try it sometime!
Tom
#12
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They all control fuel! Some for startup, some for cold water temp driveability, some for initial acceleration, some by boost, and some by rpm. The title/description
tells you that!
The temporary and PIM changes are for quick and dirty
across the board(cells) changes. But the PIM changes can be left in permanently. After getting everything in the ball park, then make the same changes to the related fuel cells.
With a datalogit, the fuel correction map can be RECALCULATED into the injector base map.
tells you that!
The temporary and PIM changes are for quick and dirty
across the board(cells) changes. But the PIM changes can be left in permanently. After getting everything in the ball park, then make the same changes to the related fuel cells.
With a datalogit, the fuel correction map can be RECALCULATED into the injector base map.
Last edited by cewrx7r1; 05-07-03 at 01:30 PM.
#14
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Originally posted by 93BlackFD
under water temp correction, what exactly are the light/heavy loads and what do the numbers represent? percentages?
under water temp correction, what exactly are the light/heavy loads and what do the numbers represent? percentages?
Back to my question: OK they all control fuel, so when the water temp is low, the computer knows this, and runs off the water temp correction numbers? You can't tell me you can pick that up by reading through that manual.
Tom
#15
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I did. And I am STOOPID, too.
I think of a set of settings or "a map of behvior (for fuel and spark)" with specfic parameters. Ambient air 30C, water temp 85C, etc.
Let's call that a "state." Now if you still want the car to run "the same" (let's assume it runs at a target AFR), you're going to need a seperate state that encompasses the changed parameters(ie. the new state is at 15C ambient air, and water temp of 80C).
So, with each variation of the parameters you have another map. Wow, that would take alot of memory and processing.
Instead you have a "base" or baseline and as the parameters vary from those in the baseline, adjustments or "corrections" are made. So think of it in terms of an equation with variables/parameters.
I think of a set of settings or "a map of behvior (for fuel and spark)" with specfic parameters. Ambient air 30C, water temp 85C, etc.
Let's call that a "state." Now if you still want the car to run "the same" (let's assume it runs at a target AFR), you're going to need a seperate state that encompasses the changed parameters(ie. the new state is at 15C ambient air, and water temp of 80C).
So, with each variation of the parameters you have another map. Wow, that would take alot of memory and processing.
Instead you have a "base" or baseline and as the parameters vary from those in the baseline, adjustments or "corrections" are made. So think of it in terms of an equation with variables/parameters.
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Hehehe. Chuckled when I read your first sentence. I think it was the inflection of your voice with the capitalization of STOOPID.
Ok I understand the 'baseline' description. If all is running well at basline adjustments are made to it as parameters change. How do I know what the basline water temp is? In other words, where is the info on the base map? I probably can't see things like water temp and ambient air temp for the base map, right?
Thanks for your help Tony. Will you pm me your number? I won't bug you much.
Tom
Ok I understand the 'baseline' description. If all is running well at basline adjustments are made to it as parameters change. How do I know what the basline water temp is? In other words, where is the info on the base map? I probably can't see things like water temp and ambient air temp for the base map, right?
Thanks for your help Tony. Will you pm me your number? I won't bug you much.
Tom
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Tom,
We'll talk tonight.
To tell you the truth, I don't remember what the "base maps" details are in terms of expected values for the parameters. I have it somewhere.
Tony
We'll talk tonight.
To tell you the truth, I don't remember what the "base maps" details are in terms of expected values for the parameters. I have it somewhere.
Tony
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