I upgraded to ZZP charge pipes and now my inlet air temperature on the RPD is around 120-130 degrees. It never got over 100 while driving before on the stock setup.

ZZP relocates the TMAP sensor from the bottom of the intercooler to right under the throttle body. I’m wondering if this is why my inlet air temp’s are 30 degrees higher? Has anyone noticed this when changing charge pipes?

 

Are you reading IAT2? If you relocated the MAF sensor to the lower CP as well, IAT1 is in the MAF and will read higher, prob within a few degrees of IAT2.

My IAT1 would climb to 125*f or higher stuck in summer stop & go traffic when on the intake.

What's your setup?

 

The setup is stock. It's reading whatever the default is on the RPD. My MAF was not moved. Only the TMAP senser was moved which is still on the same lower charge pipe, it's just moved closer to the throttle body.

 

I'm familiar with the ZZP lower CP TMAP location, my guess is you are seeing more reflected heat from the engine, but I never noticed a change when I had the ZZP lower CP on mine. :shrugs:

I ran it with the stock IC and also the ZZP IC. Did you plug the unused holes? (Not that that would cause a temp problem, just wondering) Maybe the sensor is crapping out after the move or the plug/wiring is not connected well or wires stressed/stretched.

 

Interesting...I don't think moving it a foot or so closer to the TB would make a difference in temps. However, in warmer weather it's very possible that METAL pipes get hotter (and retain more heat) than the stock plastic ones. I still have stock pipes and don't ever plan on swapping them out.

 

the beautiful thing about polymer plastics is they are excellent insulators and poor conductors. You are more than likely seeing extra heat transfered from the engine because metals are exellent conductors.

 

Indeed..one of several reasons why I won't use aftermarket CPs. I'm really surprised though that it's a whopping 30F!!

 

Very smart post. we need a rep system.

 

I'm a little confused here. The RPD reads IAT1 which i thought was pre turbo.... I dont see how changing the charge pipes would affect that. Unless its just residual heat under the hood from the metal pipes is affecting the sensor. just wondering, but i could be completely wrong.

 

Where did you get that info on RPD is reading MAF (IAT1)and not TMAP at pre throttle body (IAT2)?? I mean think about it...130F at the intake (MAF)???

EDITED:
Looks like you may be correct...I only see INTAKE temps here:

Reconfigurable Performance Display (RPD) - Instrument Panel - Chevrolet Cobalt owners manual - Cobalt Cobalt - Chevrolet manuals

Readouts #4


COOLANT TEMPERATURE: Displays engine coolant temperature as measured by a coolant temperature sensor.

INLET AIR TEMPERATURE: Displays the instantaneous temperature of the air at the inlet to the induction system.



There are NO indications of PRE Throttle body IAT2 anywhere!

 

I thought i saw it in a few different threads. Thats why people get a Dashdaq or an interceptor.

here's one thread that says its IAT1: https://www.cobaltss.net/forums/2-0l...estion-219620/


But like i said. i could be completly wrong.

 

You are CORRECT! See my edited post.

 

HAHA Didnt catch that edit!

But then why would he be should an added 30 degrees with the new pipes?

 

That's still not good for sure...but I see no reason for MAF readings to be effected by metal charge pipes. However....a metal RAM..like K&N could very well give higher temps due to not only metal used, but intake of under the hood air vs cooler outside air with the stock intake. That doesn't appear to be the case here though.

 

I have a Hahn cold air intake too. It was around 90 degrees outside on the speedometer readout. IAT said 120-130 degrees on the RPD.

 

That (metal intake) might account for it then..not the charge pipes. Funny..the stock set up is really a CAI (plastic)....you get air the same way... from the fender well! I could never understand why an aftermarket CAI would be desireable in this set up...especially with a TURBO, where all the significant heating takes place post turbo!

 

Is the K&N SRI metal? If so, I guess I'll just stick with ZZPs intake tune and airbox mod. Seems like that's the only one that doesn't conduct heat. Silicon tubing

 

I've had the Hahn intake on my car for over a year. This just happened with the charge pipe switch over.

 

That's weird for sure...you are measuring temp at the intake and I see no way the metal charge pipes can radiate that much heat into the intake. Thing is your Hahn, being metal as well, could be sucking in the added radiating heat from the charge pipe...but a 30* increase?

 

I am a plastic process engineer I battle that very problem every day. Polymers injected into steel cavities poses a problem because how the flow front skins over and insulates the molten plastic. Same reason the plastic dosent transfer heat from the engine like the metal piping does.

 

Last time I had a Tech 2 hooked up to my car I compared the IAT1 and 2 readings to what was on the RPD.

IAT 2 matched the RPD while the IAT at the MAF was 10 - 20 degrees lower. Maybe its a 2010 thing..

 

Not sure what your're saying..we have established that the RPD doesn't read IAT2 at all.
I posted a link here to the actual manual on the RPD. Unless that manual is flat out wrong, you're only seeing INTAKE temps (MAF) on the RPD. That fact pretty much trumps whatever results you got. Maybe you mixed up..or the tech2...the two readings.

 

That's a neg.

I double checked myself when I looked at it. The Tech2/CANDi software is kept up-to-date. I'll check again when I rotate the tires this weekend.

I'd also like to add that GM is right... about 75% of the time. This includes schematics, connector pin-outs, diagnostic procedures and owner's manuals.

 

So are intake temps on the RPD reading from the MAF or the TMAP sensor by the intercooler?

 

When I log in HPTuners, my IAT2 readout on the logger reads the same as the RPD. Just throwin' it out there.