R34 GTR Intercooler choice for 350awkw

[TXSquirrel]

I plan to get Nistune installed in the next month or two.  Since Nistune pretty much just piggybacks off factory ECU, it will not use the IAT signal as a part of its open loop calculation correct?  

Because I know NZEFI sells a Bosch made fast response IAT sensor that is recommended for running MAP based ECU, I'm curious if that will be needed or helpful for running Nistune.

[GTSBoy]

6 hours ago, Scooby32 said:

Ah ok. So in an aftermarket/ecu sense is an IAT useful for anything other than monitoring intake temp (assuming it's properly positioned in the airflow and insulated)?

No value other than knowing.

2 hours ago, TXSquirrel said:

I plan to get Nistune installed in the next month or two.  Since Nistune pretty much just piggybacks off factory ECU, it will not use the IAT signal as a part of its open loop calculation correct?  

Because I know NZEFI sells a Bosch made fast response IAT sensor that is recommended for running MAP based ECU, I'm curious if that will be needed or helpful for running Nistune.

Not at all useful, except as above, for knowledge.

[Dose Pipe Sutututu]

Nistune does allow you to pull timing based on IAT, however that's about it. Byou default that entire table is set to 0.

The beauty of an AFM is that there no need for fueling correction based on the air temp.

When replacing the sensor I suggest you do tests to see if the voltage range is similar if not you'll have a fun time guessing the values on Nistune where the ecu could think it's 30 degrees Celsius however it might be actually 50 degrees Celsius.

[TXSquirrel]

For your entertainment, this is what I'm seeing after a 20 minute drive.  Temperature is measured by a laser thermometer.

Greddy Infometer

Aiming at plenum about 3 cm to the left of IAT port

Aiming directly at the brass hex nut on IAT sensor

[No Crust Racing]

Must be the temp of the plenum then.

I just had an epiphany also. I was comparing your temp to mine, but mine is an R34 and the IAT readout I'm talking about comes from the cold side of the intercooler core. 

Not a reasonable comparison. 

I would say your temp sensor is reading accurately if the surface temp matches it, as was mentioned though, it's not doing much with that info. 

You did mentioned the car was running rich though, does it have any other drivability issues? Check the o2 sensors. 

[TXSquirrel]

Cold side of the intercooler is a much more logical location to mount an IAT sensor, glad Nissan improved it on R34.  Like many here suggested, the default mounting location in a R32 just makes the IAT sensor soak up engine bay heat, and the reading I took confirms it.

My O2 sensors have been replaced with brand new OEM as well.  I had a shop take O2 readings using Nissan Data Scan and they were within range as specified by FSM.  Which is very odd because plugs do look a bit dark and so does tail pipe.  My guess is the factory fuel injectors are due for retirement after 27 years.  I think all guys know leakage is hard to control after seeing some age LOL.

There is one issue that puzzles me.  The factory boost restrictor was removed, but I can't hit more than 12psi.  For reference base timing was dialed back to 18 because I was getting some audible knock.

 

[No Crust Racing]

I still have the same sensor in the plenum, but the MFD is using data from the cooler, as is my ECU. 

Check crankcase breather system/PVC etc.  

I thought restrictor removed ended up with about about 14psi. IF it's only getting 12 and seems a bit rich, any chance it has a boost leak? 

Easy enough to test and for the sake of knowing, check the cat condition. 



 

[Dose Pipe Sutututu]

pour in 10L of E85, car will lean up to somewhere desirable and will suppress knock

Alternatively, get that Nistune ASAP and wire in a Zeitronix ECA1/2. If wiring up a Zeitronix just bash off the diagnostic resister and wire the 0-5V output into the diagnostic in on the board (guide on Nistune).