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R34 GTT o2 Sensor Replacement

satanic

By satanic,
in Engines & Forced Induction

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GTRgeoff Grand Master

GTRgeoff

Posted
Posted

How many of you guys with bad economy are still running the stock computers?

The stocker responds to any extra boost by immediately enriching the fuel delivery.

Try disconnecting the O2 sensor and see how the economy goes. My GTR33 is better with the sensors disconnected.

If that fails start thinking a digital fuel adjuster or aftermarket management.

The Mafia Grand Master

The Mafia

Posted
Posted
A SAFC should be able to lean things out a bit.

Geoff I would have thought the ECU should have displayed a fault code if you unplug it.

I've got a fully tuned pfc and it still chews the ass end out of the fuel tank.

Sumo Mentor

Sumo

Posted
Posted

Fully tuned? for what, biggest power delivery or easy cruising.

Its hard to tune for both I would think. Thats where nissan engineers design a happy medium. But as geoff said, You boost it up - the computer compenstates by throwing oodles of fuel at its problem....

Cheers

Sumo

rob82 Mentor

rob82

Posted
Posted

The standard ECU is most likely to give you the best fuel economy out of any ECU, aftermarket or not as long as all sensors are working correctly and the numbers you are producing are realistic. I have a stock GTR with a chip I tuned at work it puts out 234rwkw at 12 pound and returns figures close to 500km per tank on the highway. In standard trim all nissan computers are extremely rich in the top end, this is most likely to be the cause of the build up on your bumper.

Try to remeber when deciding on who tunes your car that outright power is the easiest place to tune a car. The real furness is the light throttle tranistions, idle(not for nissans) and cruise; pretty much where most cars will drive the majority of their life.

My advice to you satanic would be to just replace the 02 sensor with the generic item.

GTRgeoff Grand Master

GTRgeoff

Posted
Posted
A SAFC should be able to lean things out a bit.

Geoff I would have thought the ECU should have displayed a fault code if you unplug it.

No fault code and only 260rwkw on the stock computer with them unplugged.

Used 25L in 35km with them plugged in and less than 10L on the return journey. I drive sensible as well. No fines in over 10 years.

The standard computer is a known pig if the boost is bumped up. It's been covered many times. There are pitfalls with aftermarket but it lies in the tuning and the attention to detail of the tuner.

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