NIStune_Mapping_Guide.pdf

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IMPORTANT INFORMATION

Nistune Developments has performed necessary measures to ensure that the Nistune software and boards are built to high standards. However

Nistune Developments will not be held responsible for any damages which may arise from the use or misuse of this product. By using this product

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IMPORTANT - READ CAREFULLY: This License Agreement is a legal agreement between you and Nistune Developments for the software

product Nistune. The software product includes computer software, the media belonging to it, printed materials and electronic documentation. With

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agreement, you are not allowed to use or copy this software product. Further you are required to remove the software product from you computer.

1. GRANT OF LICENSE

You are granted a license as a single user of this software. You are allowed to install and use this software freely. However you may not install this

software for another user and may only make a single backup. The software may be installed on multiple machines belonging to the single user

whilst those machines remain property of that single user. Regardless of other rights, the author of the software product is allowed to terminate this

license agreement if you offend against the determinations and conditions of this agreement. If so, you will have to remove all copies of the

Software and its components.

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You may not copy, modify or distribute the Software except under the terms given in this licence document. You may not sublicense the Software

or in any way place it under any other licence than this one. The Software is protected by copyright laws of the Australia and international copyright

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except those called in this license agreement.

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Your license is effective upon your acceptance of this agreement and installing the Licensed Product. You may terminate it at any time by

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The author of this Software has verified as best as possible to make sure the main features and functions work as described while normal usage on

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NO LIABILITY FOR CONSEQUENTIAL DAMAGES. IN NO EVENT SHALL NISTUNE DEVELOPMENTS BE LIABLE FOR ANY SPECIAL,

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This License is personal between you and Nistune Developments. It is not transferable and any attempt by you to rent, lease, sublicense, assign or

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COMMUNICATIONS BETWEEN YOU AND NISTUNE DEVELOPMENTS RELATING TO THE PRODUCT.

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Introduction

This document is intended as a guide to the maps/tables contained in the Nissan ECU, how they are used and what

they are used for. This document is a 'living' document which will be continuously updated as more information is

discovered and additional maps are found.

Some ECU’s are well known and you’ll find many different parameters available. Other less common ECU’s only have

the basic maps/tables available.

Parameters available vary between ECU’s. Some older ECU’s do not have as many parameters available as newer

ones.

Page 3 of 55

TABLE OF CONTENTS

•

Fuel Injection.............................................................................................................................................

Overview...................................................................................................................................................................5

Understanding Theoretical Pulse Width (TP)

.....................................................................................................6

K Constant – AKA TP Injection Multiplier

............................................................................................................8

VQ Map (AKA MAF Translation)

..........................................................................................................................9

Main Fuel Maps.....................................................................................................................................................10

RPM/Load Scales

.................................................................................................................................................11

TTP min / max – TTP injection limits

.................................................................................................................12

TP Load Limit/Recovery (Fuel Cut)....................................................................................................................14

Injector Latency

.....................................................................................................................................................15

First Time Enrich

...................................................................................................................................................16

After Start Enrich...................................................................................................................................................17

Cold Start Enrichment Coefficient

......................................................................................................................18

Warm Start Enrichment Coefficient....................................................................................................................19

First Time Injection Coefficient............................................................................................................................20

Coolant Temperature Enrichment Coefficient

..................................................................................................21

Throttle Enrichment tables...................................................................................................................................22

Alpha/N Increase Fuel vs TPS voltage..............................................................................................................23

High Gear Coefficient

...........................................................................................................................................24

Fuel Cut and Recovery

........................................................................................................................................25

O2 Sensor Feedback............................................................................................................................................26

•

Closed Loop conditions

...................................................................................................................................26

•

O2 Sensor Trigger Points................................................................................................................................27

•

Observing O2 Sensor Activity.........................................................................................................................27

•

Turning Off Closed Loop

.................................................................................................................................27

•

Example - Cold / Warm Start Enrichment (bench testing results).................................................................29

•

Example - Diagnosing Fuel maps.......................................................................................................................30

•

Ignition Timing

........................................................................................................................................ 33

Main Timing Maps.................................................................................................................................................33

Cranking Timing Table

.........................................................................................................................................35

Warmup Timing Table

..........................................................................................................................................36

Idle Timing Changes.............................................................................................................................................38

Idle/Deceleration Gear RPM timing....................................................................................................................40

Idle/Deceleration Neutral Timing

........................................................................................................................41

Timing Beta Advance

...........................................................................................................................................42

After Start Timing Advance..................................................................................................................................42

Dwell Time table....................................................................................................................................................44

Dwell Duty Cycle

...................................................................................................................................................44

Example: Determining if timing map used (J30 VE30DE)

..............................................................................45

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