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Ecuflash tuning, way to rich under boost

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AWDtalontsi96

10+ Year Contributor
144
0
Mar 29, 2010
Enfield, Connecticut
So I am trying to do some street tuning on my talon to make it driveable till I put it on the dyno. Right now just breaking in the motor and breaking in the clutch. All my mods are listed in my profile

So here is my problem I cant seem to get the afr to hit there target air fuel in ecuflash. Ive tuned before and in the higher load cells in the upper rpm range are right now at 10.7 and the my wide aem wideband is still reading 10 to maybe 10.3. As I have leaned out the cells the car is breaking up a lot less and pulling harder with no knock. When I have tuned before on evo's if you put like 9.5 to 10 in the cells under boost the ecu would always hit 11's . So its aiming for 10 and hitting 11. In my talon using ecu flash its over shooting the numbers I put it in. I have never seen a ecu over shoot the number , only fall short. Would adjusting my base fuel pressure help this. or do I keep just upping the afr's in the cells till im logging mid to low 11's in my logs.

Exactly what happens punching gas at like 2k afr's go to like 15.5 and slowing tapper down as I am coming into boost around 4K and pulls 22psi all the way to 8K . Once I start hitting boost afr's tapper down nice and smooth , but just pin down at 10 to 10.3 which I know is really rich and I don't want to wash down my cylinders on a fresh motor. Like I said I keep upping the afrs in the cells and its getting better.
 
Have you check your plugs? Double check the gap on all, also make sure your o2 sensor is still good.
 
Just a couple quickies:
Ensure the wb sensor is properly free-air calibrated.
I observe very similar behavior on my car but it is expected since I'm using stock injectors and I don't intend to jack around with globals, dead times, latencies, etc. just so that my wb matches. The stock 450's are setup fine for what they are.

So, my question to you is how well do your afr's match? You might have some tweaking to do in the injector battery voltage latency compensation.

Alternatively, when I really can't figure out what's going on in my roms I usually just start a freshie. I think of it like rebuilding PC's. Shit get's all gummed up sometimes and it's best to start fresh.
 
Have you check your plugs? Double check the gap on all, also make sure your o2 sensor is still good.

Plugs gapped to .22 brand new ngk pbr8eix , front o2 sensor is a brand new denso

Just a couple quickies:
Ensure the wb sensor is properly free-air calibrated.
I observe very similar behavior on my car but it is expected since I'm using stock injectors and I don't intend to jack around with globals, dead times, latencies, etc. just so that my wb matches. The stock 450's are setup fine for what they are.

So, my question to you is how well do your afr's match? You might have some tweaking to do in the injector battery voltage latency compensation.

Alternatively, when I really can't figure out what's going on in my roms I usually just start a freshie. I think of it like rebuilding PC's. Shit get's all gummed up sometimes and it's best to start fresh.

WB was free air calibrated. my LTFT low and mid are dead on . They are both under 3%. So my Latencies are dead on. It could be my Scaling needs to be increased to bring my WOT closer.

Profile says you're using a GM Maf?

Have you tried to decrease the values in the offending portion of the "MAF Scaling Table"?

Yep gm maf and maft . Okay looking at the Maf scaling table. So log my Hz and log my wideband. Just decrease the values in the area where its depending wicked rick till the afrs come back up to normal?

Okay just seen all you guys suggestions. So after doing some more reading. I went into the maft and did the tweaking in there first. I adjusted the WOT knob back to pull 5% fuel in the upper HZ range , that made a difference. I also noticed when I pushed the gas at like 4K say in 3rd my mid HZ range on the maf. my afr's were going all the way lean to like 16 17. Isnt that a little to lean at wot before going into boost. I mean Shouldn't it be more like 15ish and then dipping down quick in that safe afr range. So I went into the maft again and riched up the mid hz range. Again that helped some with that issue. I also put the stock fuel map back to 100% stock. So I guess right now I am just trying to scale the maf and then go into the my 2g maps and do some tweaking.
 
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