So, long story short, about 2 years ago I paid for a sd tune and now that I have hptuners, I can see I got ripped off. It's just a normal maf tune.
I emailed him, but in the meantime, I want to learn as much about this as I can and try to edit up my tune to work for speed density in case my tuner never makes things right. I don't plan to upload a new tune to my ECU anytime soon, I want to learn as much as I can first and make sure I'm sure of myself first.
First off, this is for a 2005 gto, E40. It's a flex fuel setup with a gm flex fuel sensor plugged up. 1000cc fuel injector connection injectors. Stock maf with iat sensor, procharger with 10psi, bone stock ls2 engine, stainless works long tube headers, 3 inch magnaflow exhaust with a unnecessary 2.5 inch adapter between the headers and exhaust. Boost referenced fpr.
Also, I know that when my tuner originally added spark advance in the flex fuel table, it didn't make a difference in power, then he applied the spark advance to the high octane table and it gained 50hp. Looks like there is a bug in some OS which doesn't correctly apply the flex spark. I updated my OS file when I converted to 2 bar so I'm not sure if that might fix the bug or not.
Also, I've read from hptuners
"2.5 Bar MAP - Speed Density (LS2 V8 - E40 ECM)
This enhancement contains the following features:
2.5 bar max MAP sensor support (calibration capability for GM 0-5V linear MAP sensors)
New Boost VE table from 105 kPa to 255 kPa (2.5 bar or 22.5 psi boost)
Retains stock VE table resolution in non-boost regions
Better than 5 kPa resolution in boost regions (105 kPa - 255 kPa)
New MAP referenced "Boost Enrich" table in 5 kPa increments
New Boost Enrich MAP threshold
Speed Density mode only" Does this mean once I activate this I can't use my maf? In other words, do I have to only rely on a sd tune and can't switch back to maf simply by unfailing the maf?
Anyway, I attached my original shop tune, a supposedly stock tune and the tune file that I'm working on currently. I've added values to the VE tables and made edits elsewhere.
I haven't set up the maf to fail yet. Also, looks like he scaled my maf sensor by about 49%. I'm guessing he did that since you can't enter 100lb injectors in the tune. So, I scaled my ve table by 49% as well.
Let me know what you think of my first attempt, I know I'm missing a lot of stuff, figured I start with VE.
gto (Fake) speed density tune.hpt Shop tune
gto speed density tune edited applied.hpt My edited tune file
2005 stock Pontiac GTO E40 - 12596734.hpt Stock tune