Yea, I tune with DFCO disabled so that I can tune decel to 14.7. Then I re enable dfco for driving. The reason I tune these is because it keeps the short trims from bouncing around between the time you take your foot off the peddle and dfco kicks in. If you are bouncing rich/lean, etc. in decel, it's your short PWs. Tweek the adders.

 

DFCO has been a common feature on vehicles for decades.
On decel, if all the requirements are met, your AFR should peg your gauge and go completely lean.
as there is no longer fuel being ignited in the cylinders.
if its not doing that, you have somehow disabled your DFCO and forgotten to enable it.
which is quite likely, as many people turn it off during tuning

 

Perfect my friends, I had DFCO disabled when I was tuning both MAF and VE. Once done MAF I copied that to the VE then tuned VE. Once I was done VE I copied the MAF and the VE tables to my driving tune and when on decell it will sweep to 16.0 or my guage limit. So from what you are saying then is that it is OK to sweep to 16.0 on decell on my driving tune because there is no fuel being ignited at that time and when I am driving in my driving tune the guage sweeping from 14.5 to 15.0 AFR is OK. I know we can never get it exact due to changing conditions.

If this is the case how much do I adjust the short PW adders?

thanks

 

bingo.
during decel it will peg lean.
all other times it should be 14.5-15.0 except when in PE mode.

 

Sweet. Thanks

When Idling what LTFT are you folks seeing after tuning VE and MAF? Sometimes it is bang on between -/+ 4 and others it sits at like -14 until the car warms up to OT.

 

Yea, you will always see a bit rich while the car warms up. With DFCO on, your WB should peg lean during decel. With DFCO disabled, you should get 14.7 (or there 'bouts) during decel as well. If you are idling smooth and your transition to DFCO is good, leave the adders alone. If you are bouncing or having misfires at idle, or if you go rich before DFCO kicks in, turn off DFCO and work on your adders some more.

 

With PE, Is it not supposed to kick in until you have the pedal right to the floor, or should I see it start to richen up as I lay into the pedal?

 

Check your PE Enable TPS, your delay rpm and map. When these conditions are met, your car will command richer fuel mixtures as dictated per your PE EQ table.

 

TPS is set to: 91 91 91 91 50 50 50 50 50

MAP - 55 kpa

MAP Hyst - 5 kpa

delay rpm - 1900

Enrichment rate is set to 1, and when I set the EQ ratio to command 11.4 across the board, she'll hit maybe a 12.2 or 12.8 at wot.

Does piston protection play a big part? i've got it set at 8000.

 

thats too lean. you want to be no leaner than 12.4 at w0t if you have meth. mid to high 11s if you dont.

 

I know this, that is what I am shooting for. In order to get high 11's, i have to command mid 10's in the EQ.

 

then your MAF config is still off.

if you dial in the maf, your commanded PE lines up real, real close with your actual afr

 

^ What he said. Don't tweek your PE to get your AFRs in line. Do your MAF. I command and get 11.5.

 

Ok Perfect. I kinda thought that was a factor. Still not too sure on how to drive the car when tuning maf pe.

 

make sure when you maf tune you disable defco and such, and flat line PE.

 

This I know. Was not the question I asked.

 

true, however i had previously answered that question, thus i gave you a word of advice.
one would figure that if you knew that you needed to flat line PE and disable defco you would know the "how to" and reason behind tuning a maf, but thats apparently not true.

 

Can anyone who does not feel the need to be pompous and condescending suggest to me the best driving procedure to employ when tuning the maf in PE?

 

I usually put in a filter for WOT only, say above 95% ETC. Set the PE table to what you wanna run. So if you want to run 11.8 then flat line the PE table with 1.25. Then you log and adjust the maf until you get it dead on.

 

Neo - you just crapped down the throat of one of the dude who is really giving you good info. The "That was not the question I asked" remark kinda came off as rude. Dont scare away the people trying to give you a hand.

To answer your question - when you are tuning MAF - drive smoothly and try to not get into boost/PE. You have to try and hit as many of the cells as you can. make smooth throttle transitions when you are coming on the throttle and off the throttle. Get points of low load and low engine speed and points of low load and high engine speed while still trying to keep out of boost/PE if you can. You can try points of higher load while still staying out of boost/PE.

hope that helps.

EDIT - your way ahead of the steps I am outlining - sorry. But my first statement still stands

 

you gave me the smart ass answer first, i was just helping you out.

the "driving procedure" is simple.

for best results you want to set up a scanner config just for maf tuning. turn every other logged parameter off, and log nothing more then whats needed. that way your uper rev resolution will be decent and help speed this process.

i start my log's once the car is moving, that way your low freq MAF tables dont get mixed with your maf idle settings.

once your logging and moving slowly in first, pull out onto a highway or back road and give her all shes got. i do 2nd and 3rd gear pulls.

i'll do one or two "rolling" into the throttle and last 1 or 2 i'll just kill it...part self satisfaction, part load increase.

do you know the copy and paste steps from there?

after a few goes like this (2-3) i'm usually quite dead on. tweak from there.

 

Thanks dude. So what you are saying is put a filter so that my histo will only log when it is in pe, so I don't have to worry about falling out of boost? Also, shall I run the car in boost, running everywhere between 3 psi or so and up to max, varying the map as little as possible? Thanks.

 

set the filter string to the opposite of your PE triggers, or set it to log only when MAP>2psi...that way if you get stuck in traffic or what not, things wont be effected.

run the car over thru the revs in as many spots as possible, the histo will pull the average of it all so the more counts you get in there, the better.

 

Apologies. I was not trying to **** down anyones throat, just trying to keep things from going off track. I was not trying to sound rude, but that is the bane of a text based forum... I hate having to put a smiley after every line so people don't take something the wrong way.

 

i understand that, i've been the victim of "smiley free" comments my self.

no worries here tho.