NIStune R33 GTR - Manual (Page 2)

Overview
Both R33 GTR and R34 GTR ECUs use later model Hitachi ECUs with H8 processors. Only one option
was available in Japan for tuning these ECUs which are difficult and expensive to obtain and require
specialist installation and tuning.
Nistune does not have support for these ECUs but we have found that using a modified R32 ECU is a
plug-in alternative to using a full aftermarket ECU and works seamlessly in the R33 and R34 models.
The only main differences when using this solution:
- The R33/R34 models both use different O2 sensors (Titania vs Zirconia). This is not an issue
since the voltage levels output are only slightly different.
- The R34 models are supplied with Nissan Anti Theft system which is not available on the R32
model so an aftermarket immobiliser is essential for your vehicle.
Modifications
The following modifications are required to the ECU depending on model.
1. Sensor heaters (R33 and R34)
R32 runs the heaters whenever IGN power is on. R33/R34 ECUs control the heaters itself by
supplying GND (the heater has 12V supplied to the other side whenever IGN is on) to turn
heaters on.
So what we need to do is supply GND to the heaters so they operate the same as R32 - they're
on whenever IGN is on.
This is done inside the ECU by linking O2 sensor ground (Pin 115) to injector ground (pin 116)
2. Ignition Switch (R34 only)
NATS wiring in the R34 moves the ignition switch.
Wire from pin 8 (R34 ignition input) to pin 45 (R32 ignition input)
3. Crank Angle Sensor (R34 only)
NATS wiring in the R34 swaps the crank angle sensor signal wires. Swap over pins
41/51 with
pins 42/52 .
4. Ignition Ground Refernce (R34 only)
R34 uses an external igniter. Wire ground (pin 10/20) through to ground (pin 50/60) to
provide a ground reference in the R32 ECU to ground the R32 internal igniter drivers.
Refer to the following page matching the colour coded descriptions