Using Gary's guide.

My MAF was probably way tpo high (due to not understand narrowband vs wideband tuning) so I'm lowering it close to stock in the 8000hz+ range, plus Gary even says to not touch anything above 8999hz. So to get the O2's back into the 930-940 range I've been adding -0.1 to the 2400rpm+ range of the AFR vs RPM vs TIME table. This seems to be the best way to tune without a wideband.

My concern is that my injectors are pretty much maxed and I'm out of ideas. I believe by lowering the MAF I'll get some more headroom in the AFR vs RPM vs TIME catagory, therefore getting the O2's in check. Anyone else have advice at this point?

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2009 G8 GT - White Hot


FMS Custom Cam, Yank 3600 SS, 1LE (ZL1) 3.91, SLP Longtubes, Magnaflow cat-back, Rotofab CAI, tuned via HPTuners
415/391

Stock injectors usually support down to a 3.1" pulley

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2000 SSEi - SilverBullet - 78,000 kms, 4" "straight shot" custom headlight ram air inlet, TOGs, 1.9's, Lsd, 2.9-3.4"MPS 10-15 psi, Ported GenV, EGR eliminated, OR pushrods, oil volume kit, trani cooler & shift kit, Titanium retainers, 90 lb springs, 160 Stat, 42# injectors, Fuel pump voltage increase, Wideband O2, 3" to dual 2 1/2" Magnaflows, Snow Meth/water injection, after SC temp gauge, 255/50WR17, timing commander set 15-18*@WOT, 2 speed Fan over-ride, disabled DRL, Solid motor mount, Meziere Electric water pump, adjustable fuel pressure regulator, Drilled & slotted rotors/ceramics, GXP sway bars and STB, Upgraded and rebuilt transmission with ZZP 2500 rpm stall TC, Pioneer Bluetooth stereo with sub and 800 W amps, PB 13.5 quarter, (April 2014 car of the month)

Usually, but I'm anywhere from 22.2 to 23.x at WOT.

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2009 G8 GT - White Hot


FMS Custom Cam, Yank 3600 SS, 1LE (ZL1) 3.91, SLP Longtubes, Magnaflow cat-back, Rotofab CAI, tuned via HPTuners
415/391

Kyle,
You are calling out a section in the tuner.. AFR vs RPM vs TIME table
What is the actual path to this catagory?
is it in fuel control? or airflow?

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Best 60' = 1.716
Best ET = 12.186
Best MPH = 112.98

If your IPW's are higher than you think they should be, chances are you are running richer than commanded AFR. Only real way to know is a wideband.

Tuning WOT AFR via Narrowband O2's == pure guesswork.

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2004 Buick Lesabre Limited, Gran Touring
Bone Stock

1998 Buick Lesabre Limited, Gran Touring
Retired

Engine -> Fuel Control -> Power Enrich -> Add vs. RPM

And if I'm running a possibly richer AFR than commanded, what can I try to lean it out a bit?

_________________
2009 G8 GT - White Hot


FMS Custom Cam, Yank 3600 SS, 1LE (ZL1) 3.91, SLP Longtubes, Magnaflow cat-back, Rotofab CAI, tuned via HPTuners
415/391

Either increase the PE AFR or keep tweaking the MAF table like you're doing...thing is, it's all guesswork without a wideband, and you certainly don't want to over-lean it out.

I guess what I'm saying is that your next investment should be a wideband.

Question: have you checked your fuel pressure? Low fuel pressure can make your IPW's higher-than expected, also...

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2004 Buick Lesabre Limited, Gran Touring
Bone Stock

1998 Buick Lesabre Limited, Gran Touring
Retired

I did when idle using a pressure gauge. I'll have to dig up the pics I took of my readings. What is normal?

_________________
2009 G8 GT - White Hot


FMS Custom Cam, Yank 3600 SS, 1LE (ZL1) 3.91, SLP Longtubes, Magnaflow cat-back, Rotofab CAI, tuned via HPTuners
415/391