Custom Modifications: GT500 Hood Vent

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**First off: Yes this mod WILL help more heat escape from your engine bay. How much more and how efficiently we do not know since we do not have access to a wind tunnel or whatever other equipment is used to find these statistics. If you want to do this purely for aesthetics then go ahead. Hopefully we can help answer any questions you have.**

Going into a track day with a predicted high of 103* and a potential overheating issue, FJD Performance decided that we needed to do something about getting heat out of the engine. So along with the install of new rotors, pads, fresh Wilwood DOT 4 brake fluid, and a Mishimoto racing thermostat  we had come to the conclusion we needed some type of vent to help extract heat. So with a shortage of time and tight finances, FJD Performance picked up a GT500 hood vent and went about the cheap heat extractor modification that many others in the SN95 community have done. With some help from our friends over at 2khlis Motorsports, the first person to put the GT500 hood vent on the SN95 hood, we got to work with less than 12 hours to complete the project before “race day”. Luckily the high dropped down to 96*, but we did not want to take any chances with such high heat, and high mileage.

First we figured out where we wanted to have the vent placed on the hood so that one: it would get a sufficient amount of air out, and two: that it wouldn’t be in a critical spot for when it rains in California, lol, that water doesn’t get on important electrical components.

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If you’re not fond of measuring well then…that sucks because if you want it to look good there’s lots of measuring that needs to be taking place… Taking it to a shop isn’t out of the question though. The question is what kind of shop would do that for you.

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We started by drilling holes all the way through along the perimeter of where we planned to cut out for the vent. After that we used a dremel and cutting wheels to cut along the lines.

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After cutting along the lines you will come to notice that your hood does not have the same amount of rigidity in it. If you choose to actually spend money and get a Trackspec vent then you don’t have to worry about rigidity because their vents help put it back into the hood. That’s where the expanding foam comes into place. You need to tape along the perimeter of the giant hole you just cut and try your best to maintain the same distance as there was before you decided to cut an ENORMOUS HOLE IN YOUR HOOD… *ahem* once you’re all taped up you can start poking the foam end into the hood and spraying inside. You will need to let the expanding foam cure over night, but after about 2 hours you can start to take the tape off. Do note that you need to spray both in front and back of the hood. Also if you were thinking “Yay! Weight reductions, Yo!” well think again. The foam actually adds more weight to your hood. So again Trackspec.

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This was post hood vent install, but we decided to fabricate a type of shield/cowl addition to the bottom of the vent to help get more air out and to protect those 20+ year old electrical components. We used thin aluminium sheets to create the — for lack of a better, politically correct word — cowl. We used a 2 part expoxy to mount the aluminium to the plastic vent.

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