Ambient Temperature Research with Force Induction

COSMO

After doing much research on ways to cool my TT 370z I thought I might share some findings. For starters I have the app Torque and have set it up to monitor several things on my car and one of them being the air intake temperature. My car is a touring with the sport package and a GTM Stage II TT. After logging and monitoring many trips in my car I noticed the ambient temperature and the air intake temps were right at 10% meaning what ever the outside air was the air intake temp would run 10% hotter. That being said I had an idea of trimming the plastic piece of the front bumper which is about 4 inches total in height so more air could be more effective of the intercooler. Doing that alone made a 5% difference from the ambient temps and the air intake temps. No biggie right..!! Recently I just went went a Vented carbon hood and did more logging and believe it or not my ambient temps are now the exact same is my air intake temps. I started this thread in hopes to helping others that might be looking at ways to cooling their FI z. Will post up pics today of the oem bumper trimming..

phunk

id be curious to see your pictures.

under what circumstances are you comparing temp? i would expect you to find drastically different percentages pending airflow (speed) and heat soak.

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COSMO

Good question obviously when you come to a stop light or stuck in traffic it will rise due to not getting any air flow. My test were done on the interstate cruising between 65-85. Loook its not rocket science but by opening up the stock bumper and or buying an aftermarket bumper with decent flow to the intercooler goes a long way. I couldn't be more happier with the results in my forced induction z...

COSMO

Will post up some pics tomorrow.....

Chuck33079

I'm glad you're logging this, since I'm always looking for more ways to keep my car cool. Another thing that may be helpful is tracking how long it takes for the IAT to come back down to ambient after sitting still- ie traffic conditions. It's a little late for a baseline though, since you've already cut the bumper and got a vented hood.

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Nissanboy

Now install a nitrous spray bar in front of the intercooler and let us know the results

Chuck33079

The problem with that is the location of the air filters on a GTM kit makes it too easy to suck in some NO2 you're not tuned for.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

Nissanboy

Good point, didn't even think about that.

roplusbee

Great info. I figured that the vented hood and a larger opening in the bumper would definitely help. The problem for me is finding a hood that is not heavier than stock and finding the right shop to do the bodywork (and it look good instead of hacked up).

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COSMO

Pretty happy with my VIS after having it painted to match the car. Pics will come Today!!!!

Nixlimited

Yes, because of this, I am considering having vents cut into my stock hood backed by black mesh or something. I also do not like the necessity of hood pins with CF hoods.

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theDreamer

I have been tracking my intake temps lately but never did prior so nothing to compare to.
Once I get a vented hood I am curious to see how it changes, if at all.

Nix, most 370z aftermarket hoods have the 3 lock slots like your OEM hood, so you just transfer them over. Most cars needed them in the past because they just came with a single lock and you needed to add 2 for racing.

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COSMO

As promised a few pics...

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Nixlimited

Looks really nice, Cosmo.

@theDreamer - do you know if the Seibon hoods come that way? I feel like I always see people saying (internet experts?) that you still should run hood pins.

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New ride: 2015 GT-R - 647 WHP / 641 WTQ (e85) & 543 WHP / 519 WTQ (91)

Boosted Performance

I wouldn't be all that concerned about IAT's at cruise, and would pay a lot more attention to them at WOT. If the system is efficient, you should not be seeing IAT's more than 15% over ambient (at about 10psi of boost). Also, my experience shows that turbine housing flow has a lot more to do with IAT's than the size of the intercooler.

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