$6e MAF Table Tuning Question
07-30-2013, 02:25 PM
#1
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Car: 89 Firebird
Engine: 406 CI
Transmission: Pete K 700R4
Axle/Gears: 3:55
$6e MAF Table Tuning Question
I am currently tuning a 406, and am struggling a bit with the higher maf tables. Although I have searched for days, I can't find a thread that explains the best way to datalog the entire MAF range.
For the lower tables, I found a flat, smooth, isolated road.
Car was put in 1st gear (auto) and I accelerated as slowly and smoothly as possible through the rpms, and tweaked the first couple of tables.
I tried to keep the load values around 70-80.
The problem I am having wrapping my head around, is how to best tune the middle and upper tables.
Should I disable PE and AE, so I am sure they are not a factor?
If anyone can guide me towards a link, I would appreciate it.
PK
For the lower tables, I found a flat, smooth, isolated road.
Car was put in 1st gear (auto) and I accelerated as slowly and smoothly as possible through the rpms, and tweaked the first couple of tables.
I tried to keep the load values around 70-80.
The problem I am having wrapping my head around, is how to best tune the middle and upper tables.
Should I disable PE and AE, so I am sure they are not a factor?
If anyone can guide me towards a link, I would appreciate it.
PK
07-30-2013, 02:53 PM
#2
Re: $6e MAF Table Tuning Question
First, Adjust your max airflow vs rpm table to allow maf to read more range.
Your 406 if have decent heads and cam will max out the maf at 255 g/s fairly quickly.
So basically work the tune via pe mode vs rpm. Find where you start to hit maf limit of 255. My 383 pegged it at about wot at 4000-4200 rpm or so. After that its all pe enrich vs rpm and you end up giving it a lot. Pe enrich curve will follow torque curve so as torque peaks you should about have the most enrich and tail off til hp rises above torque at 5252 rpm then enrich should rise to redline or atleast hp peak
You could disable the pe mode, and tune maf up to the point it pegs out at 255 g/s, and then re enable pe mode to finally dial in air fuel for wot max rpm. Need a wideband o2.
Can use narrow band for most of it but wideband to make sure its spot on. I've seen narrow bands do strange things
Your 406 if have decent heads and cam will max out the maf at 255 g/s fairly quickly.
So basically work the tune via pe mode vs rpm. Find where you start to hit maf limit of 255. My 383 pegged it at about wot at 4000-4200 rpm or so. After that its all pe enrich vs rpm and you end up giving it a lot. Pe enrich curve will follow torque curve so as torque peaks you should about have the most enrich and tail off til hp rises above torque at 5252 rpm then enrich should rise to redline or atleast hp peak
You could disable the pe mode, and tune maf up to the point it pegs out at 255 g/s, and then re enable pe mode to finally dial in air fuel for wot max rpm. Need a wideband o2.
Can use narrow band for most of it but wideband to make sure its spot on. I've seen narrow bands do strange things
07-30-2013, 03:39 PM
#3
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Car: 89 Firebird
Engine: 406 CI
Transmission: Pete K 700R4
Axle/Gears: 3:55
Re: $6e MAF Table Tuning Question
First, Adjust your max airflow vs rpm table to allow maf to read more range.
Your 406 if have decent heads and cam will max out the maf at 255 g/s fairly quickly.
So basically work the tune via pe mode vs rpm. Find where you start to hit maf limit of 255. My 383 pegged it at about wot at 4000-4200 rpm or so. After that its all pe enrich vs rpm and you end up giving it a lot. Pe enrich curve will follow torque curve so as torque peaks you should about have the most enrich and tail off til hp rises above torque at 5252 rpm then enrich should rise to redline or atleast hp peak
You could disable the pe mode, and tune maf up to the point it pegs out at 255 g/s, and then re enable pe mode to finally dial in air fuel for wot max rpm. Need a wideband o2.
Can use narrow band for most of it but wideband to make sure its spot on. I've seen narrow bands do strange things
Your 406 if have decent heads and cam will max out the maf at 255 g/s fairly quickly.
So basically work the tune via pe mode vs rpm. Find where you start to hit maf limit of 255. My 383 pegged it at about wot at 4000-4200 rpm or so. After that its all pe enrich vs rpm and you end up giving it a lot. Pe enrich curve will follow torque curve so as torque peaks you should about have the most enrich and tail off til hp rises above torque at 5252 rpm then enrich should rise to redline or atleast hp peak
You could disable the pe mode, and tune maf up to the point it pegs out at 255 g/s, and then re enable pe mode to finally dial in air fuel for wot max rpm. Need a wideband o2.
Can use narrow band for most of it but wideband to make sure its spot on. I've seen narrow bands do strange things
Your input almost mirrors my thoughts. I just wanted to see how others have done it.
MAF currently pegs at 3600 rpm, and my PE has been tweaked to be in the 895-915 mv area.
Wideband (in the tailpipe) shows this to be about 12.3 to 12.5 or so.
My current problem is that a slow throttle roll into PE bypasses (I assume) the AE shot, and car runs well, with good data.
However, when I spike the throttle I rattle the knock sensor.
Datamaster shows the spike as lean. I drive through it ok, but I would like to get it as good as I can.
AE tweaks have not changed a thing.
My thoughts now is that maybe the MAF table needs work in the upper areas, so the transition into PE is smoother?
07-30-2013, 04:05 PM
#4
Re: $6e MAF Table Tuning Question
Some maf work may help that but does sound more like a AE shot thing. If ae vs delta lv8 doesnt help then i believe there are some others based on tps you can try. I did notice on my stalled auto car, a wot stab that unlocked the converter always tripped the knock sensor. Car felt strong and did not continue to knock so i didnt get picky with it and left it alone
08-02-2013, 02:59 PM
#5
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Re: $6e MAF Table Tuning Question
Would anyone be willing to look at a datamaster log, and offer an opinion.
Based on the data, it looks to me like I have a lean tip in, but no matter what I do with ae, I cannot figure it out.
Based on the data, it looks to me like I have a lean tip in, but no matter what I do with ae, I cannot figure it out.
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