Nissan GT-R Tuning Guide

The following guide is designed to present experienced tuners with an efficient calibration procedure specific to this Accesstuner application.

If you are new to engine management system tuning, we suggest gaining general knowledge and understanding of both calibration and engine dynamics before proceeding at your own risk.

Nissan GT-R COBB Custom Features Guide

1 Nissan GT-R Tuning Guide
- - 1.1.1 The following guide is designed to present experienced tuners with an efficient calibration procedure specific to this Accesstuner application.
- 1.2 Nissan GT-R COBB Custom Features Guide
2 Preparation
3 MAF vs SD
4 Tuning Ignition Timing
- 4.1 CBA 2008 to 2010 world market, 2009-2011 USDM
- 4.2 DBA 2011+ World Market, 2012+
  - 4.2.1 -10 * multiplier value 0.152 (Ignition – Air Temp. Correction (Multiplier)) = -1.52
  - 4.2.2 -10 * multiplier value 0.102 (Ignition – Coolant Temp. Correction (Multiplier)) = -1
5 Tuning Boost
6 Tuning Variable Cam Timing
7 Integrating All Tuning Parameters for the Ideal Calibration
8 Precautions

Preparation

Update your Accessport firmware, review some helpful documents, and start with the appropriate base map

Update the firmware on your Accessport to the latest version by following instructions available here.
Browse to the Accessport support home which includes information on setting up data logging, a key component of tuning and monitoring your engine.
Review the Maintenance, Updating, and Common Issues: Nissan article, It includes information on common issues on this platform that should be reviewed prior to ensure the vehicle is in good condition to tune.
We have also included a Help File you can access by pressing the F1 key while the Accesstuner software is open. There's a detailed description of all tables and tuning tips for most tables.
Please start with a base map that best fits the hardware installed on your vehicle and fuel being used. That information is included in the map description viewable using the Accessport or Accessport Manager software. Alternatively you can review map notes on the COBB website under the “MAPS” section. Be sure to enter your vehicle type so maps for your platform are displayed.
After completing the above, open your Accesstuner software and complete any available software updates.
Please make sure the Weighted Interpolation box has been checked. This setting is found in the Display tab of the Configure Options menu, which can be accessed in the software by pressing CTRL+F key. Selecting this will cause Live Trace to appear smoother so you can better identify the current operating condition.
We have written a detailed description for all tables. You can view this information by enabling the Table Description option under the View menu or by pressing CTRL-F1 while the particular table you want to learn about is highlighted in the table list located on the left hand side of the Accesstuner software.

Choose your ECU

The first screen to appear when opening a new GTR Accesstuner session provides two initial choices.

Select the Vehicle System you want to tune, whether it's ECU or TCM. If TCM is chosen you can choose which LC strategy you want followed by the exact ROM you want to tune on. Keep in mind gen 1 TCM Files cannot be run on a gen2 TCM
If ECU is chosen, select your market, year, and ECU.
If you can't find your particular selection, clicking Reset will allow you to start over from the beginning.

Establish safe load/boost targets and limits along with other base settings

Along with adding in any MAF or Injector scaling you have available to you, enabling the safety features and setting up the COBB Boost Cut to safe levels that aren't in the way of what you're tuning can help you keep the car safe during the whole process, and avoid running into any safeties on accident.