The Mustang Forum for Track Enthusiasts

Track Mustangs Online was built specifically for those who track their Mustangs!

NEW - FP FP350S HOOD VENT KIT

Scootsmcgreggor

TMO Intermediate
Think you for the answer 302blown.

Question then. If a larger extractor would cool more and reduce engine bay pressure even more then I’m curious why the race louvers are not bigger? Still trying to wrap my head around this (probabaly because it’s gnarly physics I’m not smart enough for).
 

302blown

TMO Intermediate
10
11
Central, NJ
Think you for the answer 302blown.

Question then. If a larger extractor would cool more and reduce engine bay pressure even more then I’m curious why the race louvers are not bigger? Still trying to wrap my head around this (probabaly because it’s gnarly physics I’m not smart enough for).
Bigger how? The width of most of our kits is as big as the hood body lines will allow.
 

302blown

TMO Intermediate
10
11
Central, NJ
Deeper (fore-aft), ala the fp350s vent which started off this thread.
Ah, excellent question. Some back round, first keep in mind cooling is truly about airflow thru your rad, oil and intercoolers up front. Relative to engine bay pressure, the pressure on top of most vehicle hoods can be broke down into 3 areas, the front 1/3 which is low pressure, the middle 1/3 which is neutral and the rear 1/3 which is high pressure. Too often do I see people all up on putting vents in the front low pressure zone because they saw some fancy cfd image on the web but this is bad as most radiators are aft of this low pressure zone and since the goal is to move air thru the rad putting a vent forward of the back of the rad will being asking the air coming out of the rad to go up, do a 180, go forward under the hood, then up and another 180 back out the hood, yeh not gonna happen.. So the optimum place for the front of our extractors is to be just behind the radiator. Now the rear of the vent cant get too close to the high pressure zone near the windshield or the higher pressure air will feed back into the engine bay pressurizing the air your trying to reduce the pressure on. How far forward the high pressure zone extends from the glass is relative to vehicle speed and how much air is being added to it by the extractor. Further a larger physical size of the area between the extractor and the windshield is part of how downforce is made. So our general guide lines for our extractors are 2" behind the rad and no closer than about 20" to the glass in the middle and about 15" on the sides. This is how the fore/aft size is determined. I cant say why the above frpp is the size that its but I can say since it doenst work nearly as good it can be closer to the glass. I can say that our Race Louvers work nearly 3 times as good as that louver design above and the above design would have to be 3 times the size of ours to work as good. So while bigger is better sqin wise, there is a certain area they need to be in which limits the maximum size.
 

VoodooStang

TMO Intermediate
42
74
Charlotte
Because the build quality is just not the same... Nothing agains Carter's Customs, or Trackspec or other companies like that, but the fit and finish is not always on par with that of the OEM parts. And for example, the FP350S part completely replaces and fills the cavity of the OEM GT350 hood vent, whereas Carter's part leave it void and doesn't bother because that vent ahs a couple of trick compound curves you have to adjust your part to...

It's cheaper, and there's always a reason why.
TrackSpec GT350 hood vent purchased from OP Mustang
7B16DDC1-0852-4B16-875B-7E0CBB633AD6.jpeg
6A3AC69F-91EF-4BCA-8834-F606E381728E.jpeg
C0001607-6202-4D00-A20F-743BDC28B351.jpeg
2B2EDA77-36F3-4849-A858-A7C548485ACC.jpeg
27CC6397-193A-48BA-BDD3-9A23C22D2D8A.jpeg
E3BAA915-701E-4222-9BFE-7217F357B999.jpeg
E65E154F-DEF4-48F6-9A78-989F7F19516A.jpeg
BB672024-3C03-438A-8E91-4771B0A1D718.jpeg
7755A935-4833-4F98-8C89-E88BF682C818.jpeg
D679715D-770B-43EC-B588-00D7F2E13642.jpeg
 

ronaldwalterfilho

TMO Intermediate
19
8
Long Beach

VoodooStang

TMO Intermediate
42
74
Charlotte
Do you experience any problems when it’s raining? If water gets in there either while it’s parked or while driving does that causes any problems?
Thank You
No issues driving in the rain or washing the engine. I periodically wash the engine and under hood area at the local car wash with high pressure soap and rinse.
 

TMO Supporting Vendors

Top