IAT Temps for PD Blowers

[BMR Tech]

Are any of you guys using this from VMP for your VMP, Whipple, or Kenne Bell setups?? Terry@Beefcake Racing told me to get one ordered...

http://www.vmpperformance.com/2015-Mustang-IAT-harness-and-brass-air-temp-senso-p/15iatkit.htm

I do. I believe I was the first person to test it out. Works great! :cheers:

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[BDMACH1]

I do. I believe I was the first person to test it out. Works great! :cheers:

I should have known....lol

Bob

 

[908ssp]

Can you explain where your getting this IAT data? 10 degrees over ambient is what is read from the IAT1 at the MAF, it's nearly impossible for the air to run through the compressor and not pick heat.

1. What sensor is used
2. where is it connected
3. Where is it displayed

Nobody is running a set up like mine yet. 1.250 inch water lines, high volume pump with very low back pressure to impede flow. Huge intercooler and heat exchanger all with 1.250 fittings. Thermal break between manifold and engine nobody but DOB has anything like that.

I am running the GM sending unit recommended by Lund mounted in the manifold, for the nGauge. The second IAT gauge is a Prosport fast reacting digital unit. The sender is also mounted in the manifold after the intercooler.

 

[Roh92cp]

Are any of you guys using this from VMP for your VMP, Whipple, or Kenne Bell setups?? Terry@Beefcake Racing told me to get one ordered...

http://www.vmpperformance.com/2015-Mustang-IAT-harness-and-brass-air-temp-senso-p/15iatkit.htm

Every PD system system must have an IAT2 sensor like this installed otherwise the calibration can't adjust according to the compressed post rotor air. This does not however give you a true IAT reading to be displayed on the dash or a gauge. Only the PCM can see this temp and no PID has been assigned to have it properly displayed.

True but keep in mind that the same heated air is going through a intercooler/heat exchanger before it goes into the cylinders. What Mach just posted is required if you do a Lund tuned Whipple I believe bacause he wants to know the "real" intake air temps. I'm curious what the delta between the MAF IATs and the Real IATs are.

Right and of course the intercooler helps, but there is no way post blower temps will be 10 degrees above ambient temps. Even the IAT1 from the MAF pre compressor is only within 10 degrees when cruising.

VMP Gen2 TVS - drove it to work the other day in this nice muggy 91+ (car said ambient was 95) degree Florida Heat. Over 40 miles each way to work, mix of traffic and highway. (My drive sucks)

IAT2 (post rotors) monitored on dash, and with the NGauge via VMP Relocation harness

1. driving in the city - 120-124 average
2. driving on the highway - 111 - 115 average
3. sitting in traffic - 125 - 133 average, never seen over 133 sitting in traffic.

Yes but again this harness and sensor does not have a proper PID transfer function to make it read accurately through the PCM and Ngauge. This has been confirmed by Dept of Boost and Whipple who have done independent testing as well as I. I like stated above have the Ngauge which displays the IAT2 and I also have an independent system ZT-2 that displays IAT2 (post compressor) with its own sensor and they are not inline after 100 degrees. Up to 100F They are close.

 

[Roh92cp]

Nobody is running a set up like mine yet. 1.250 inch water lines, high volume pump with very low back pressure to impede flow. Huge intercooler and heat exchanger all with 1.250 fittings. Thermal break between manifold and engine nobody but DOB has anything like that.

I am running the GM sending unit recommended by Lund mounted in the manifold, for the nGauge. The second IAT gauge is a Prosport fast reacting digital unit. The sender is also mounted in the manifold after the intercooler.

Ok you have been in touch with Dept of Boost right. I just read through some of your build thread and that is an impressive intercooler system you put together. large everything including tank with extra capacity, Bravo my friend.

 

[BMR Tech]

Yes but again this harness and sensor does not have a proper PID transfer function to make it read accurately through the PCM and Ngauge. This has been confirmed by Dept of Boost and Whipple who have done independent testing as well as I. I like stated above have the Ngauge which displays the IAT2 and I also have an independent system ZT-2 that displays IAT2 (post compressor) with its own sensor and they are not inline after 100 degrees. Up to 100F They are close.

I see what you are saying.

However, just some info, I have owned and have experience with many PD Supercharged cars.

Typically, my results when driving are usually in the 30~ degree delta range when comparing Ambient VS IAT2 (post rotor temps)

I see where you said 15-20 degrees lower, is what my system will read, compared to what it actually is. My only issue with this is the fact that I have never owned a TVS car that went much over 30 degrees delta under normal driving in traffic - and you are insinuating that I am seeing 60+

Sorry, but that is a hard one for me to swallow. You are basically saying that just a bout every TVS car out there runs at 130+ all the time.

I have a 2011 GT that is almost an exact replica of my car here at BMR, and the temps are "in line" with what I show on my set-up. Just an FYI.

 

[BMR Tech]

@Roh92cp I am going to likely set up a way to log the IAT2 with another method with my new engine/blower combo. I will integrate it into my ZT2 that I have, and see what my results are (deltas). I will have both in a datalog to overaly. Should be good info.

To touch on what I said above, here is one of my favorite cars I have owned. On this Cobra I had, I logged IAT2 religiously, as I was REALLY pushing this thing hard.

The reason I have a hard time with the temps you are mentioning is because of all the work and effort and data I had with this car, and it didn't even see those Ambient vs IAT2 deltas. As you may know, these systems were VERY inefficient compared to the newer stuff.

 

[Roh92cp]

I see what you are saying.

However, just some info, I have owned and have experience with many PD Supercharged cars.

Typically, my results when driving are usually in the 30~ degree delta range when comparing Ambient VS IAT2 (post rotor temps)

I see where you said 15-20 degrees lower, is what my system will read, compared to what it actually is. My only issue with this is the fact that I have never owned a TVS car that went much over 30 degrees delta under normal driving in traffic - and you are insinuating that I am seeing 60+

Sorry, but that is a hard one for me to swallow. You are basically saying that just a bout every TVS car out there runs at 130+ all the time.

I have a 2011 GT that is almost an exact replica of my car here at BMR, and the temps are "in line" with what I show on my set-up. Just an FYI.

All I'm saying is IAT2 as displayed through the Ngauge from the PCM is not accurate and my findings from having both Ngauge IAT2 reading and an independent system reading IAT2 shows that after 100 degrees they start to split. The Ngauge IAT2 at the cars hottest sitting in traffic slow driving is 15-20 off from the standalone ZT-2 IAT2 reading.

 

[BMR Tech]

Gotcha.

The good news is, it can be adjusted in the tune....and I think that is what may be the case for myself, since I was somewhat of a Guinea Pig for this harness from my understanding. ;)

 

[Roh92cp]

Gotcha.

The good news is, it can be adjusted in the tune....and I think that is what may be the case for myself, since I was somewhat of a Guinea Pig for this harness from my understanding. ;)

Right the Delta form IAT1 inlet in the MAF to IAT2 post compressor in the lower intake is what Whipple and others use to adjust the calibration.

 

[Obsol3te]

Jesus... my IAT2's are usually a few degree's below ambient when driving city/highway.
Stop n go traffic they'll climb to about 10-15º over, but it drops back down QUICK

 

[zaquhree]

I see 135-150 in traffic in FL heat with my Eaton on the 2003 Cobra I have

 

[908ssp]

Jesus... my IAT2's are usually a few degree's below ambient when driving city/highway.
Stop n go traffic they'll climb to about 10-15º over, but it drops back down QUICK

Impossible.

 

[Roh92cp]

Jesus... my IAT2's are usually a few degree's below ambient when driving city/highway.
Stop n go traffic they'll climb to about 10-15º over, but it drops back down QUICK

Impossible.

I have to agree with a conventional air to water Intercooler system your never gonna get ambient temps IAT2, except for the first minute. The only way you could see less than ambient is if you have an ice box. Something is wrong with your IAT2 reading.

1. Where is your IAT2 sensor located?
2. What brand is the sensor.
3. What system is used to read it, like PCM or Ngauge?

 

[olaosunt]

I have been seeing IAT's of 120-140's with my newly installed 3.2 KB(replaced on3).

My AAT readings have also been quite high 115-120" so wondering if I have an issue with a sensor .I am using the N gauge (the IAT reading are the same as the computer but the AAT is different from what I see on my dash).

Could the headers be causing the high AAT as when I step out I can feel the heat from the headers coming from underneath the car?

I really was quite worried since I rarely saw above 10 in my 12 with a snake bite TVS.

I spoke to Travis and he said it was normal to see 25-30 over ambient.

He explained it has something to do with the bypass valve being open and that the temps should come down under boost(it comes down a few degrees) when the valve closes.

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