MAF tuning
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MAF tuning
is there a how to on this anywhere on here, i didnt see it up in the stickys
from what ive saw you have to disable the MAF then tune VE, once thats good how do you know what numbers to enter in for the MAF?
from what ive saw you have to disable the MAF then tune VE, once thats good how do you know what numbers to enter in for the MAF?
#2
once you've finished tuning your VE you would then reenable the maf & tune that, there are no set numbers.
Many parts of this how to will transfer over to the p12 pcm http://www.thetuningdoctor.com/HPTun...uningGuide.doc so would be a very good starting point.
Many parts of this how to will transfer over to the p12 pcm http://www.thetuningdoctor.com/HPTun...uningGuide.doc so would be a very good starting point.
Last edited by foff667; 02-29-2008 at 11:54 AM. Reason: Automerged Doublepost
#3
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All you really need to do when you get to that stage is record histograms and then rewrite the tables by hand using your experience. You CAN copy them, but it's better to understand what you are looking at so you don't copy over any rogue data. Do it multiple times until you get it closer and closer each time.
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yea i have VE tuning experience from years with my eco cav, that concept I understand totally its the MAF stuff I dont
so you just do the AFR error vs maf thing and slightly add or decrease the maf number at that frequency?
i have that ls1 tuning document and from what it says there you base the whole thing around the VE numbers
so you just do the AFR error vs maf thing and slightly add or decrease the maf number at that frequency?
i have that ls1 tuning document and from what it says there you base the whole thing around the VE numbers
#5
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MAF has jack **** to do with VE in our cars. they will only use the VE numbers if the MAF is failed or is reading incorrectly.
set up a histogram to log your wideband data vs your maf sensor frequency. you should have a single row of cells which record an average percentage of maf sensor error. copy these percentages and paste special (multiply by percent minus half) into your MAF table of your editor.
set up a histogram to log your wideband data vs your maf sensor frequency. you should have a single row of cells which record an average percentage of maf sensor error. copy these percentages and paste special (multiply by percent minus half) into your MAF table of your editor.
#6
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MAF has jack **** to do with VE in our cars. they will only use the VE numbers if the MAF is failed or is reading incorrectly.
set up a histogram to log your wideband data vs your maf sensor frequency. you should have a single row of cells which record an average percentage of maf sensor error. copy these percentages and paste special (multiply by percent minus half) into your MAF table of your editor.
set up a histogram to log your wideband data vs your maf sensor frequency. you should have a single row of cells which record an average percentage of maf sensor error. copy these percentages and paste special (multiply by percent minus half) into your MAF table of your editor.
yea i have VE tuning experience from years with my eco cav, that concept I understand totally its the MAF stuff I dont
so you just do the AFR error vs maf thing and slightly add or decrease the maf number at that frequency?
i have that ls1 tuning document and from what it says there you base the whole thing around the VE numbers
so you just do the AFR error vs maf thing and slightly add or decrease the maf number at that frequency?
i have that ls1 tuning document and from what it says there you base the whole thing around the VE numbers
Last edited by Psykostevo; 02-29-2008 at 01:44 PM. Reason: Automerged Doublepost
#7
yea i have VE tuning experience from years with my eco cav, that concept I understand totally its the MAF stuff I dont
so you just do the AFR error vs maf thing and slightly add or decrease the maf number at that frequency?
i have that ls1 tuning document and from what it says there you base the whole thing around the VE numbers
so you just do the AFR error vs maf thing and slightly add or decrease the maf number at that frequency?
i have that ls1 tuning document and from what it says there you base the whole thing around the VE numbers
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One thing that I am going to add to this discussion is the following:
You are running 60s, right? Stay away from VE tuning at first. Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter). Then change your plot filter to 1ms and above and see how it goes. Then remove your filter entirely and see how it compairs. The reason for this is because it will give you a chance to distinguish MAF errors from low PW fueling errors so that you can properly get your adders dialed in. The process is much easier to do in MAF, especially since there are some cells that deliver PWs above 1ms and below 1ms depending upon whether you are accelerating or in decel.
When you're done getting your adders dialed, go ahead and tune the VE to your heart's content. VE does play a part in our cars during transitional throttle situations and stuff. Not so much that it has to be dead nuts, but if it close and smooth, you should notice a difference.
You are running 60s, right? Stay away from VE tuning at first. Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter). Then change your plot filter to 1ms and above and see how it goes. Then remove your filter entirely and see how it compairs. The reason for this is because it will give you a chance to distinguish MAF errors from low PW fueling errors so that you can properly get your adders dialed in. The process is much easier to do in MAF, especially since there are some cells that deliver PWs above 1ms and below 1ms depending upon whether you are accelerating or in decel.
When you're done getting your adders dialed, go ahead and tune the VE to your heart's content. VE does play a part in our cars during transitional throttle situations and stuff. Not so much that it has to be dead nuts, but if it close and smooth, you should notice a difference.
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One thing that I am going to add to this discussion is the following:
You are running 60s, right? Stay away from VE tuning at first. Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter). Then change your plot filter to 1ms and above and see how it goes. Then remove your filter entirely and see how it compairs. The reason for this is because it will give you a chance to distinguish MAF errors from low PW fueling errors so that you can properly get your adders dialed in. The process is much easier to do in MAF, especially since there are some cells that deliver PWs above 1ms and below 1ms depending upon whether you are accelerating or in decel.
When you're done getting your adders dialed, go ahead and tune the VE to your heart's content. VE does play a part in our cars during transitional throttle situations and stuff. Not so much that it has to be dead nuts, but if it close and smooth, you should notice a difference.
You are running 60s, right? Stay away from VE tuning at first. Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter). Then change your plot filter to 1ms and above and see how it goes. Then remove your filter entirely and see how it compairs. The reason for this is because it will give you a chance to distinguish MAF errors from low PW fueling errors so that you can properly get your adders dialed in. The process is much easier to do in MAF, especially since there are some cells that deliver PWs above 1ms and below 1ms depending upon whether you are accelerating or in decel.
When you're done getting your adders dialed, go ahead and tune the VE to your heart's content. VE does play a part in our cars during transitional throttle situations and stuff. Not so much that it has to be dead nuts, but if it close and smooth, you should notice a difference.
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Open the histogram settings for your MAF histo (or any one for that matter) and you will see the option of using a plot filter. hit the "?" and you will see the different sensors and PIDs that you can use to apply filters. you put in the sensor name and the condition. Say for instance you want to filter out the lean spikes or DFCO, you would enter [sens.120] < 17 (iirc). That is telling the histo to only record info where the AFR is less than 17.00. I do not remember the pid for injector PW average bank 1, but it is in there somewhere...
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Depends on your definition of "runs the same". I can tell a difference, but perhaps I am even more **** retentive than you are Bryan. Mostly the difference is in tip in, on/off throttle, etc... I have also noticed a slight difference on the swing of the trims at times during idle and just off idle, but that could have been my imagination.
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not running 60s yet but thats the eventual destination, hmm a VE that looks like boobies! that would be cool
im totally confused here - Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter).
No idea what that means, whats pulsewith anywhere in the maf table?
im totally confused here - Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter).
No idea what that means, whats pulsewith anywhere in the maf table?
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In my 05 I found that doing the VE made is quite a bit smother. This was with 42s and 60s on a 2.8" and 2.6". I didn't get tip-in knock as much after I did VE either.
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don't stab the gas = no tip in knock.
steve. it's your imagination.
im actually going to make a ve map look like a pair of **** and start sending it to people
i has jokes
steve. it's your imagination.
im actually going to make a ve map look like a pair of **** and start sending it to people
i has jokes
Last edited by Area47; 02-29-2008 at 06:28 PM. Reason: Automerged Doublepost
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not running 60s yet but thats the eventual destination, hmm a VE that looks like boobies! that would be cool
im totally confused here - Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter).
No idea what that means, whats pulsewith anywhere in the maf table?
im totally confused here - Start by tuning MAF from 1.2ms on up untill it is dialed (using a plot filter).
No idea what that means, whats pulsewith anywhere in the maf table?
...
Last edited by SJSchafer; 02-29-2008 at 06:46 PM. Reason: Automerged Doublepost
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Yea, now only if you can figure out why I am commanding 18* of timing and only logging 12.5*...
Last edited by SJSchafer; 02-29-2008 at 06:50 PM. Reason: Automerged Doublepost
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Yea, I can take a look at it if you want and maybe point you in a direction. I am finding out though that a lot of injector settings change quite a bit from injector to injector. I could get you to a place to start and let you know where to go from there, but it would still require some work on your part to dial them in. Let me know.