Custom Intake Air Temperature Sensor Install

[SECURITY]

hey guys,

ive been playing around with my emanage ultimate a bit and ive wanted to play with the AIT adjustment maps where i can adjust fuel or ignition as temps increase.

as far as i know the gtst doesnt have an IAT sensor built into the AFM so i cant get a signal to my emanage.

i wanted to know wether i could custom mount one somehow so i could start doing the settings.

any suggestions would be great.

[stolen_s15]

paul (paulr33) tried this on am r33 gtst with a PFC. All is did way fry the PFC, I dont know how it would go with the EMU though. Let us all know if you do set it up.

[SECURITY]

so the gtst afm DOES have a intake temp sensor???

[Omurru]

Wouldn't you want to be measuring the airtemp as it goes into the engine not into the turbo?

[stolen_s15]

No it DOES NOT have a temp sensor. As far as I know paul tried to rig one up, and thats what caused the problem.

[SECURITY]

Wouldn't you want to be measuring the airtemp as it goes into the engine not into the turbo?

yeah, but if there was one in the AFM it would be alot easier to use. if i could get one in the intercooler piping it would be better but the sensor would be under alot of load, wouldnt it?

No it DOES NOT have a temp sensor. As far as I know paul tried to rig one up, and thats what caused the problem.

oh ok. so my other option is to find a IAT that another car uses that is separate to the AFM and wire it in (the emanage lets you choose the sensor type separately - so i could use whichever type i wanted).

[Omurru]

yeah, but if there was one in the AFM it would be alot easier to use. if i could get one in the intercooler piping it would be better but the sensor would be under alot of load, wouldnt it?

True, but I think you'll find the temp between the AFM and the manifold will change significantly and it may not be a linear change between the two as the temps rise. I'm pretty sure GTR's have an intake air temp readout option on the PFC hand controller, though I ain't sure where exactly they pick up the temp from. The sensor being under load shouldn't really be a problem, you'd use one of the metal probe ones like a water temp sensor as opposed to a resistor type one.....

[discopotato03]

No it DOES NOT have a temp sensor. As far as I know paul tried to rig one up, and thats what caused the problem.

A Hotwire Mass Air Flow sensor does take into account ambient conditions - provided the box/filter gets air at ambient temperature . Air changes mass with density - temperature basically and thats where the mass in MAF comes from .

Its also the reason why most MAF sensed engines don't use an air temp probe and compensations . In the past alternate load sensing devices such as the vane/flap AFM and MAP sensed systems NEED an air temperature probe so that the computer can attempt to calculate air density from air temperature .

This is the reason I loath MAP based systems and rate them last of the three main alternatives so hotwire gets the biggest tick in my book .

As to why the RB26 gets its air temp probe I'm not sure . I do know that various race and rally teams found out the hard way that high performance turbo engines (manufacturers style) have changing requirements when run at full load for extended periods of time . I'd say that most manufacturers take it for granted that their customers won't drive their factory hottie that hard for that long without giving up either their freedom or their ass .

Its no secret that Nissan put a huge effort into developing the Skyline GTR so possibly put it down to an air temp facility as a diagnostic tool or possibly some Grp A homologation requirement .

Personal opinion I suppose .

[stolen_s15]

A Hotwire Mass Air Flow sensor does take into account ambient conditions - provided the box/filter gets air at ambient temperature . Air changes mass with density - temperature basically and thats where the mass in MAF comes from .

Its also the reason why most MAF sensed engines don't use an air temp probe and compensations . In the past alternate load sensing devices such as the vane/flap AFM and MAP sensed systems NEED an air temperature probe so that the computer can attempt to calculate air density from air temperature .

This is the reason I loath MAP based systems and rate them last of the three main alternatives so hotwire gets the biggest tick in my book .

As to why the RB26 gets its air temp probe I'm not sure . I do know that various race and rally teams found out the hard way that high performance turbo engines (manufacturers style) have changing requirements when run at full load for extended periods of time . I'd say that most manufacturers take it for granted that their customers won't drive their factory hottie that hard for that long without giving up either their freedom or their ass .

Its no secret that Nissan put a huge effort into developing the Skyline GTR so possibly put it down to an air temp facility as a diagnostic tool or possibly some Grp A homologation requirement .

Personal opinion I suppose .

Perhaps I was not totally clear. I should have said for security's intended purposes there is no dedicated IAT sensor that he can get a reading from. Yes, hotwire AFM take temp into account, but as far as I know they dont output that information.

[Beer Baron]

of course they output that? that is pretty much all a hotwire AFM does is measure inlet air temp (ie density) then convert that to a voltage output. it's useless for what you want as you have nothing to decode that output to a temp reading.

BUT

what you want is an inlet air temp sensor. pretty simple concept. it measures air temp and converts it to a voltage output. GTRs have them from factory mounted in the inlet plenum (32+33) or the intercooler outlet (34 GTR).

so the simple solution here is buy a 32 GTR inlet air temp sensor, plumb in in and wire it up you may need to swap some pins around on the loom plug so get a hold of the GTST plug pin out and the 32 GTR one too and match them up.

[Guilt-Toy]

if it worked without frying the ecu i would do it to my car =)

[SECURITY]

i wont be doing this mod anymore, ive got a plx wideband on its way so ill be letting the emanage tune the mix at RPM vs. my desired AFR's, so on hot track days ill just make the emanage tune my afr's to a richer mix rather than hotter temps, i think its safer.

although i'd probably do what BB suggested except find a IAT sensor off another car that is a single unit and wire it in (the emanage lets you choose which sensor off which car you wish to use).