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Tuesday, November 22, 2016

RB26 MAF : Nissan Skyline GT-R Mass Airflow Meters : Troubleshooting and Repair


Group A R32 GT-R with OEM MAF
The stock RB26dett has a pretty unique arrangement for measuring the amount of air that comes into the engine. It has a dual MAF, or mass airflow meter. Most production cars have a single MAF, but for the RB26 Nissan decided to double up. The way they work, there is a heated element in a tube. Air passes over that heated element, and from the change in resistance, the amount of voltage varies.  Since they can put out anywhere from 0-5 volts, it is not often that you will see a "CODE" or Check Engine Light if it is faulty. Watch out for cheap knock off MAF. There are many out there on the internet. You are better fixing your OEM sensor, or buying a used OEM than a new aftermarket MAF.

Code 11 - crank angle sensor signal system
Code 12 - Air flow meter signal system
Code 13 - Engine temperature signal system
Code 21 - Ignition signal system
Code 34 - Detonation sensor signal system
Code 41 - Intake temperature sensor signal system
Code 43- Throttle sensor signal system
Code 51 - No error



MAF - The stock RB26 65mm MAF(Mass Air Flow) sensors are good for about 400 wheel horsepower. Above then they run out of range and max out their voltage. A popular replacement(in 2000) is the Nissan 300ZX meters. A 300ZX uses one MAF - we double up for the GT-R.They are physically larger(80 mm). More recently the R35 blade style MAF have become popular. With most stand alone engine management, cars generally go to a MAP(Manifold absolute pressure) sensor. The thing about MAP based tuning is that the density of air is dependent on temperature and pressure. Some ECU's swap over to MAP based load, but with the ITB's, it can be a difficult thing to tune for part throttle.

The thing is, the mass air flow meter are probably 25 years old, or older now. Since they are one of the main inputs into the ECU to schedule fuel and timing, what they have to say is very important.  Often we see the solder joints inside the MAF go bad. In this case, it is possible to open up the top, resolder, and you are back on the road. Check out these links below.


How to repair RB26 MAF - Skylines Australia



https://youtu.be/0nnigpKWFnY


Upgrades or Aftermarket

OEM - Don't use non Nissan parts

300ZX - Z32 MAF, 80 mm. You need a new connector, you need tuning. Not plug and play unless you have a Power FC, or NISTUNE. They will do about 400 hp each, so will meter about 800 hp of air.

R35 to RB26 MAF adaptor from RHDJapan.com


R35 - There are drop in adaptors available. Even in black so they look near stock.

NISTUNE MAF adaptors



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