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Taking Data Logs Intro:
Properly taking data logs will shorten the amount of time it takes to tune your vehicle and ensure the accuracy of your tune. The first week of tuning will be tuning your MAF curve which requires its own method for taking data logs (see below).
After the MAF curve tuning process you will take data logs the same way each time. Take 2 logs in 4th gear on a flat, smooth and dry road from 3000 rpm to 6500 rpm. Consistency here is crucial to ensure power gains for each adjustment made.
Parameters You Should Log:
Actual AFR
MAF Voltage
Boost
Mass Airflow
Boost Air Temp
RPM
Calculated Load
Short Term FT
HPFP Act. Press
Spark Adv.
Intake Temp
Accel PED POS
Intake Valve Adv.
Throttle Position
Knock Retard
Vehihcle Speed
Long Term FT
Wastegate Duty Cycle
INJ Duty Cycle
Tuning MAF: Week 1
I’ll need 3 MAF calibration logs after each revision:
Our first few days of tuning we will focus on your mass air flow curve (MAF). Dialing in this MAF is the single most important part of tuning your vehicle. When taking MAF tuning logs you should be in second gear and pull up the MAF g/s screen on your Cobb Access Port.
I essentially need to see the MAF g/s range from 5 g/s to about 150 g/s. G/S is a measure of air that is passing by your MAF sensor. The higher the g/s number the more air your engine takes in. Therefore as you increase throttle the more g/s are produced.
While in second gear, very slowly increase throttle. As keep an eye on g/s and you will see the number increase. Make sure the number is continually increasing as you take the log. Do a couple practice runs without logging to get the hang of it. Take two (2) of these logs.
Also be sure to send a log of your car at idle. This should only be a few seconds of log time (5 – 10 seconds). Make sure the car is fully warmed up before taking the log. Take one (1) of these logs.
During the MAF tuning process put 30+ miles on your car of normal driving after flashing a new map. This will allow your fuel trims to settle at each break point.
Tuning: Week(s) 2+
This is when we will add boost, timing, and make all the necessary adjustments to your tune.
Overview:
Our goal is to help you get your car running the way you want. Ask questions if you want to learn. This entire process shouldn’t take more than 3-4 weeks as long as you’re responsive. You should get us data logs within 24 hours of receiving each new map. Tuning the MAF curve is one of the more time intensive parts but after that you should be able to get logs same or next day. Each tuner can only tune so many people at once so if you are unresponsive for days at a time it’s going to take longer. If the process takes longer than 30 days because of this it’s going to cost you an extra $50 per month.
-Rich
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