Intercoolers and IATs

[BradM]

I'm trying to get some IAT data from folks who run quarter miles. I wanted the GH intercooler but they seem to have no interest in selling them so I went with a Mishimoto J-Line and the Schwartz plumbing kit. When measuring the OEM and J-line cores, the OEM core has 462 cubic inches of area and the J-line core has 554.4 inches. My J-line is a true FMIC and sits in front of the entire cooling stack (not behind the AC condenser and against the radiator like OEM) and it's not blocked by the crash bar or bumper skin like the OEM. So I conclude the J-line should produce lower IATs than OEM.

My average IATs during quarter mile runs show that I dip to ~40 degrees over ambient (30% into the run) and peak at ~68 degrees over ambient at the end of the run. These are runs with 72-77 degrees of ambient temperatures. I'm curious what other are seeing. Is my J-line doing better than OEM or even doing as good a GH?

 

[76FoMoCo]

I have a GH IC and usually at ambient or up to 15* below. O wait I have meth too .

 

[Shoplus80]

I'm trying to get some IAT data from folks who run quarter miles. I wanted the GH intercooler but they seem to have no interest in selling them so I went with a Mishimoto J-Line and the Schwartz plumbing kit. When measuring the OEM and J-line cores, the OEM core has 462 cubic inches of area and the J-line core has 554.4 inches. My J-line is a true FMIC and sits in front of the entire cooling stack (not behind the AC condenser and against the radiator like OEM) and it's not blocked by the crash bar or bumper skin like the OEM. So I conclude the J-line should produce lower IATs than OEM.

My average IATs during quarter mile runs show that I dip to ~40 degrees over ambient (30% into the run) and peak at ~68 degrees over ambient at the end of the run. These are runs with 72-77 degrees of ambient temperatures. I'm curious what other are seeing. Is my J-line doing better than OEM or even doing as good a GH?

That Schwartz pump is great I have the TR8 intercooler and noticed a 25-30 degree drop in the intake. I would think since the GH is placed behind the condenser and the J-line is in front of it you would get a lot better air flow to keep the intake temps down.


Andrew J Szynaka
2012 SHO PP

 

[kryptto]

@BradM as I promised here is a screen cap of a WOT gear run through from stop till 3rd gear. Ambient raised 5 degrees from 95-100. The blue is the IAT average of 146. The day was 93 degrees out, I have the past weather report from that day and time of the run. STOCK IC

 

[BradM]

Thanks for this. You started the pull around time marker 45? It's really hard to figure out the temp delta because the scale doesn't show temp but it looks like it might be ~38 degrees at the end of the run? That's short of a quarter mile for sure and third is where I see my best temp delta (it goes up from there). It's weird that your ambient increased. There are two other temp sensors besides IAT2. One is right after the filter and the other is hanging on the passenger side of the core support. If you are measuring after the filter, you might be sucking in hot air with your K&N. My CAI was open on top and they expected the hood to seal it. It didn't so I built a cover so all intake air is coming in from the front. My ambients are dead flat on every pull.

 

[kryptto]

Good pickup on the ambient - my K&N will be short lived. I want the one for EPP. You are right that suction starts pulling in hot engine compartment air.

It was a WOT for the tuner to check the performance up to 3rd, so it was definitely short of a 1/4 mile. This Sunday if no rain - was gonna pull in more data. TBH the HP Tuner is much more detailed over SCT. I am going to fire up HP and see if I can get some good info on a true 1/4 mile run. I just need to make sure weather and my friends looking for me will be best.

 

[kryptto]

I was possibly.... especially here in South FL looking at these to help:

 

[ridered74]

About 25-30 over ambient temp by the end of 1/4 mile run with gearhead intercooler. 68 over ambient is basically what you get out of stock intercooler.

 

[kryptto]

Yellow highlight is zero mph max speed is 104mph in pink.

 

[SM105K]

Good pickup on the ambient - my K&N will be short lived. I want the one for EPP. You are right that suction starts pulling in hot engine compartment air.

It was a WOT for the tuner to check the performance up to 3rd, so it was definitely short of a 1/4 mile. This Sunday if no rain - was gonna pull in more data. TBH the HP Tuner is much more detailed over SCT. I am going to fire up HP and see if I can get some good info on a true 1/4 mile run. I just need to make sure weather and my friends looking for me will be best.

If you have a stock air box and K&N drop in that is the route to go. Sealed from hot engine air, factory ram air, and it provides more CFM than the stock turbos can use.

 

[kryptto]

If you have a stock air box and K&N drop in that is the route to go. Sealed from hot engine air, factory ram air, and it provides more CFM than the stock turbos can use.

Thank you - I have heard the same. It was one of those easy to do and get into, unfortunately wasted my money on it. I would say the EPP is my goal.

 

[xekrubx]

If you have a stock air box and K&N drop in that is the route to go. Sealed from hot engine air, factory ram air, and it provides more CFM than the stock turbos can use.

Oh good. Glad I did the wrong thing. Bought the Roush setup. I did cover the hot sides of the box with this silver backed sticky foam to help isolate it from the bay heat. And it sounds great.

 

[BradM]

Well, I just learned something interesting about IATs. I returned my car to its stock tune and stock MAP sensor and left everything else the same. Using the SCT device, my IAT is shown as running 2-4 degrees above ambient when cruising. But when I use my 93 or E30 AJP tune and the 3 bar MAP sensor, my IAT is shown as running 25-30 degrees above ambient when cruising. I'm not sure if the Ford tune is reporting an adjusted number (like it does for coolant temp) or if AJP tune is pulling from a different sensor? I know there is another sensor at the input to the intake...not sure what it's measuring. But we cannot compare stock IATs to tuned IATs, that's for sure.

 

[76FoMoCo]

AIT1 and AIT2 are 2 different sensors. Make sure you are looking and the same one.

 

[BradM]

AJP logs "intake air temp2" and SCT logs "Intake Air Temp". I don't know which sensor they are using.

 

[SM105K]

IAT2 is post intercooler.

 

[kryptto]

Heat soak baby!

 

[thenewguy]

Well, I just learned something interesting about IATs. I returned my car to its stock tune and stock MAP sensor and left everything else the same. Using the SCT device, my IAT is shown as running 2-4 degrees above ambient when cruising. But when I use my 93 or E30 AJP tune and the 3 bar MAP sensor, my IAT is shown as running 25-30 degrees above ambient when cruising. I'm not sure if the Ford tune is reporting an adjusted number (like it does for coolant temp) or if AJP tune is pulling from a different sensor? I know there is another sensor at the input to the intake...not sure what it's measuring. But we cannot compare stock IATs to tuned IATs, that's for sure.

Did you ask Brad about this? Would be interested to know as well since I'm in the same boat as you

 

[BradM]

Did you ask Brad about this? Would be interested to know as well since I'm in the same boat as you

I haven't asked but you can figure it out by displaying IAT on your SCT device and then unplugging the sensor(s) to see which one is being measured.

 

[thenewguy]

I haven't asked but you can figure it out by displaying IAT on your SCT device and then unplugging the sensor(s) to see which one is being measured.

No, I meant why such a discrepancy between the 2 sensors and why not use the one that's showing less heat soak to possibly make more power? I assume iat2s are the more accurate ones hence why he uses that