So today I noticed something different. Before, my IAT would be almost exactly ambient temp as soon as I would hit 20mph. After the cobra jet setup, while stopped it sits around 120 degrees on a 85degree day but it doesn't drop to the 80s until I run over 60mph for more than 5 mins or so. Anyone else notice high IATs? Just cruising at 30-40 keeps my IATs around 15-20degree higher than ambient. Just strange to me. I know in my camaro, timing starts pulling when IATs reach certain temps. Any inputs? Runnin FRPPs intake and still using the stock air tunnel feed.
IAT very high on cobra jet Setup?
- Thread starter Jvibe92
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I don't have a CJ setup up but had the Boss Mani and Steeda CAI and experienced the same thing although the temp did drop real quick once I started moving. Running a procharger now with the boss mani and my IAT'S are only 1 or 2 degrees above ambient, even when stopped.
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- May 19, 2016
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I have the same set up but I have the smaller dual gt500 tbody not the mono blade. I haven't paid attention. But I will start watching it and reply back
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Those IATs aren't normal. I monitored mine on my drive to lunch and I was getting 1°-5°F over ambient temp. It's 76°F where I am today, and I had a consistent 77°-82°F IAT when cruising with light to moderate traffic.
When I am stuck in bumper-to-bumper traffic however, I will see upwards of 120°F IAT on a relatively warm day.
When I am stuck in bumper-to-bumper traffic however, I will see upwards of 120°F IAT on a relatively warm day.
That's exactly how mine was when I had the Boss Mani and Steeda CAI setup. If those Temps don't drop as soon as you start moving something is wrong somewhere.
While driving around temps are always a few degrees within ambient. While sitting still your temps will rocket, while the airbox is sealed it also acts like an oven once you no longer have air flow going in. The heat from the engine bay rises, which cooks the box and turns the inside into an oven.
This is just how things go with open box intakes. The stock one is completely sealed and only draws from the front by the grille so it takes longer to heat soak. The open intakes, when sitting, will heat soak the tube and idle airflow is low so it will start to increase. Try letting the car sit for 10 mins after parking, open the hood and put your hand on the bottom of the heat shield and you will notice it's going to be too hot to touch, same for the intake tube where MAF is, you won't be able to hold your hand on it for long.
This is just how things go with open box intakes. The stock one is completely sealed and only draws from the front by the grille so it takes longer to heat soak. The open intakes, when sitting, will heat soak the tube and idle airflow is low so it will start to increase. Try letting the car sit for 10 mins after parking, open the hood and put your hand on the bottom of the heat shield and you will notice it's going to be too hot to touch, same for the intake tube where MAF is, you won't be able to hold your hand on it for long.
I understand but when traveling at 40plus I would assume, like pre SCJ, for the temps to drop to near ambient. I rechecked everything and retightened the MAF just because and today while traveling 40mph for a min, my IAT was 118 at 89F ambient. What another possibility? I'm
Sure I installed the manifold right haha or else fuel would be spewing everywhere
Sure I installed the manifold right haha or else fuel would be spewing everywhere
What intake are you using?
The IAT's are coming from the MAF sensor so whatever the issue is it's on the front end of the intake.
Remember the tube also heat soaks, so even with moving air the heat soaked tube is still transferring it's heat to the seniors which is directly connected to it. It will take the flowing air a bit before it can bring those temps down.
I guess the tube heat soaks more now since the intake manifold has all that open space where the heads are and it's just really taking forever to cool down. Don't people with boss manifolds have something that places on the block the blocks that huge opening?
Again, this is not normal. If you are driving the car for say, 5 minutes without stopping and your temps are that high above ambient, something is up. If the car is idle and absorbing heat for a period of time, it's going to read hotter than ambient. But if the car is in motion for several minutes and it doesn't come down near ambient there is an issue.
Now that we cleared that up, need to find the problem. As said before, the MAF is what reads temperature. The MAF may not have a tight seal on the intake tube. It'd be worth it to yank it out and check and make sure there are not bad surface to surface issues. Your problem is not at the manifold portion, it's on the intake side.
Now that we cleared that up, need to find the problem. As said before, the MAF is what reads temperature. The MAF may not have a tight seal on the intake tube. It'd be worth it to yank it out and check and make sure there are not bad surface to surface issues. Your problem is not at the manifold portion, it's on the intake side.
I doubt you have leak, Looking at the pic's of the FRPP CAI the MAF is on the engine side of the tube, so I think you're right about the MAF placement letting the sensor get heat soaked.
The couple CJ setups I've seen had the CAI's with MAF on the front of the tube away from the engine like the stock air box.
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