Nearing the end of my now Turbo 3800 build in the '87 GT using Water to Air Intercooling. Got some ideas and need to know if this will work great or is it overkill and dangerous.... (Ps. I'm dead set on Water to Air, this thread is not about that)
First, little background.. Everyone knows over 80 MPH the front end gets very light from built up air-pressure, over 90 MPH your headlight covers can and will fly open! I found with the hood un-latched there was enough air flow to lift it almost 4inches at 70mph even with the air flowing over the hood forcing it closed! That's a lot of air flowing up, under the front end. I do not condone any of this for the record... Furthermore when I wanted to enjoy my 3800SC, I would intentionally un-latch my hood to keep more grip on the front wheels, it made a huge difference, felt so much more planted and controllable.
So a hood vent is 100% necessary in my book. But could it work better? I think so..
With the front trunk removed its obvious the issues.
1. Hood vent, vents the trunk area not where the most pressure is at the top of radiator in the nose...
2. Having very little space behind the radiator, creates an air-bubble that can block air from flowing through the radiator...
3. Trunk wall at the nose is nearly 3 feet of slightly angled wall. Then add another 8inches where the body drops for the cabin. Thats a lot of flat space to create drag, and lift.
What I propose...
1. Cut out some of this cross brace so there's less blockage behind the radiator, allows more air to escape through the hood vent, and allows a real shroud and ducting to be designed for improved cooling, and smooth air flow out the hood.
2. Fabricate ducting to surround the radiator plus heat exchanger, to catch air, flow more air with less drag, and ramp up the outlet so it exhausts more air out the vent for better downforce and less drag.
3. Mount solid sheet from bottom of radiator, over cross-member, and attach to cabin. Smooths air underneath, creates flat bottom for lack of a trunk tub, and drastically reduces surface area to cause drag and lift.
Doesn't seem to hard for the benefits as my car is stripped to nearly bare frame, the only thing I'd be wary is of cutting out that front support beam. I'm not talking about modding the bumper or impact beam, just enhancing the bottom feeder characteristics for a much better flow of air through the radiator, through the hood vent, and under the car. Thoughts?
1987 Fiero GTX 3800 Turbo... My Build, ST3 Cam, Lowered, Wheels, and pics enjoy!http://www.fiero.nl/forum/Forum1/HTML/089483.html