OK, This is getting old for sure, but for those on this forum that really want to know, and I really hate to do it to you here it goes.
You, Hijinx and now VAfist, have all said that our car is a MAP based tune. You have said that based on an article from the oracle of tuning COBB, "http://fordstnation.com/cobb-tuning/2189-cobb-initial-focus-st-r-d-findings.html" he says our car is a speed density tune, not does not incorporate a MAF sensor. Dyn085 has said that based on his extensive self tuning experience and data logging experience, that bolt-ons such as FMIC, Exhaust and Air Intakes make no difference in the power of our cars without tuning (You have continually said this all throughout this forum including in this post).
Let's looking at some weird and challenging information
First, my experience.
https://www.procharger.com/gallery/2002-pontiac-trans-am
I attended both the EFI101 Accelerated Certification Program and EFI Advanced programming course. Prior to tuning the Trans Am. I not only tuned that vehicle, but I built that engine and based on its tune made 26 mpg and still made that power and passed NC inspection with real 02 sensors. So I did not buy HP Tuners and start futzing around with the computer and then call myself a tuner. I understand what Speed Density Tuning is and I understand what MAF tuning is and I completely understand what Volumetric Efficiency is. But we will come back to that in a second.
As for Bolt-ons not making power on our car,
View attachment 9527
I drove 2 hours on Saturday to National Speed located at 6779 Gordon Rd, Wilmington NC. Their phone number is 910-332-5901. Should any one wish to question the above dyno graph they can call Keith.
Let's break it down. What I had on the car prior to the tune, this is the only Engine related modifications done.
MAP FMIC
MAP 3" Exhaust
MAP Charge Pipes
Uninstalled Stock BOV, and Installed TurboSmart BOV before Throttle in Charge Pipe
Completely removed Sound box from, car, I know what you all say its for, but its gone.
Installed Velossa Tech Design Big Mouth Intake
Installed CP-E Air Intake
Stock Downpipe
There were 3 runs each, each one was without 1 HP and 1 TQ on the run 2. 199HP and 223TQ. That is more than the reported stock dyno numbers of 183/212.
So either Dyno085
1. The parts you installed on your car were not good enough to make a difference
or
2. You do not know how to data log.
You can justify whatever you want to justify, the numbers above speak for themselves.
The number 5 run was part of a second set. I had gone with the intentions of not changing any of the tune, but Keith and my install friend say why not just put the Cobb Shelf Stage 1 tune in to see what it does. If you don't like it you can put it back.
My hesitance is the reliability of my car, I need my car for my job, and with now 160,000 miles on the car, just being careful. I cant afford for this to break today. But, I reluctantly agreed to the Stage 1 shelf tune.
There were 3 pulls, all within 1 HP and 1 TQ. 5 was the best. 198HP and 251TQ.
Now, to be fair to everyone, I have not followed the Stage path to upgrades. But in my opinion, 80% of the increase is coming from the installation of the 3" exhaust.
Now that we have that covered, its time to dispel this MAP, MAF thing.
http://www.superstreetonline.com/how-to/engine/sstp-1004-eletronic-fuel-injection-maf-map-sensors/
DYN085, Hijinx, and VAFIST, you all need to read this article along with anyone who wants to understand how these cars function.
MAF is Air Density Tune (this is dynamic tuning)
1. adjust on the fly
2. if you unplug this from your car (based on the article from cobb because we don't use it, your car should run fine, which it wont).
MAP is Speed Density Tune (this is static tuning)
1. adjust based on tables
2. is absolutely meaningless below 8-10PSI
3. Because Cobb says we have 3 lf these and that the MAF is irrelevant, if you were to unplug this sensor, your car would not run, which is hogwash. You could unplug all of these and the would run up to a point.
80% of drivability happens below 3000 RPM and less than 10lbs of boost. Data logging boy should know that. If you are driving the car without putting the throttle to the floor you could drive this car without a map sensor and the car will function.
The MAP sensor is used to accommodate pressure readings outside of the what the MAF will read. As I have said before, but probably didn't completely qualify, if you have a Normally Aspirated Car, No Turbo, No Supercharger, and you were to put a small turbo on the car and were making less than 7lbs of boost, and if the air was cold enough up to 10lbs of boost, the MAF sensor will adjust and accommodate without any tuning. Ford and GM are both diligently working on a sensor that will read up to two atmospheres worth of air.
I am in no way saying COBB is not the authority in Tuning these car and the others they support. I am saying the guy in this article in 2012, did not know what he was talking about. He clearly was not the tuner for COBB and begged to work on the car. The other aspect about this COBB article is it is a marketing article and should not be taking seriously as to how cars and their computers function.
This car, our car, the entire Ecoboost line uses the MAF sensor for all calibration under somewhere around 10lbs of boost. The MAF runs in open loop until it maxes out its reading capabilities, and then goes to closed loop and starts to dump fuel. Then as boost climbs, which would a very small amount of time that we drive, and relies on the Tables to determine what the fuel and timing curve should be, when you come out of boost and are back below 10lbs or so, the MAF takes over. THIS IS FUEL INJECTION ENGINE MANAGEMENT 101 from about late 1980's.
The Cobb article also states that adding a aftermarket Air intake adds turbulence and that is why they don't add power. I don't even know where to go with this comment. Air flow dynamics 101, Has anyone ever heard of the word combination smooth transition? Like maybe going from pipe to pipe, when porting heads, 45 degree eblows instead of 90 degree. The corrugated pipe from the factory does nothing but create turbulence. The aftermarket pipes smooth out turbulence. The reason they don't add power is because the MAF is programmed to read x amount of air based on the diameter of the tube. When you increase the tube size allowing for more air, you have to change the VE tables to accommodate. You can lie to the VE table and change the scale across the entire table, but option 2 is to go with a different MAF sensor, which is available in some applications. If the MAF sensor knows there is more air their then it will be able to read it.
I applaud you for doing your own tune, that's great. But going around here pushing your inexperience and arguing with others because you think your right is just causing confusion for others. Based on the dyno reading, based on the superstreet article, based on every car made from 1986 forward, you just don't know what your talking about and continually reposting your noise, does not make you right.
Hijnx, I still love you man, congrats on the 12 runs and getting home.