True Ram Air

[g35sedanlover]

I would like to make my g35 true ram air. I would seal off my stillen airbox (pretty much make a box instead of just a shroud) and then run a tube to the front bumper and make an intake duct. Has anyone ever done this before? does anyone see downfalls to this? Will this mess with the computer or will it adjust as needed?

[Andy_V35Sky_350GT]

Dunno about your mod but the MAF and the O2 will only adjust alittle and generally never enough for that much air.

[slobo7x]

Stillen intake is soooooooo well designed, I have yet to see a better intake setup.

Yes there are flaws to running a tube in the bumper, you can easily get water in your intake. water= hydrolock= no good.

Why mess with it if you have a stillen setup, you probably have got the best intake setup that you can buy. All those that are running 10 feet of mendral bent piping down their bumpers thinking they have an advantage due to "cold air' are dreaming.

[g35sedanlover]

I know stillen flows well which will decrease the amount of vacuum, but I was hoping to force air into the system (for a RAM air intake, not just a cold air intake). It sounds like the computer might not know how to handle it anyways...

Thanks for all the input

[zozoka1212]

Build an intake fan a front of it to force the air in.



zozo

[Q45tech]

Good articles that explain the problem and some solutions:http://www.autospeed.com/cms/article.html?&A=0629

Unfortunately the pressure builds so slowly that one must exceed 100 mph to get a meaningful gain.Remember the engine is already supercharged by the earth's 14.7 psi so 1/4 psi [7"WC] is only a 1.7% increase at 150 mph. At 60 mph the pressure increase is 0.2%.Not to say you cannot find 4 HP if you are a good engineer and have a wind tunnel to test.

The problem is to find the point of maximum pressure at any speed and it is not usually where you think it is by looking at body.............in front of condenser just off to side is usually highest.

http://www.planetsoarer.com/BFIDIY/BFIDIY.html

http://www.vararam.com/ramairinaroadcar.html

"The calculation is quite trivial if you have had exposure to gas dynamics and understand the Isentropic Flow tables. Take the speed of the car and divide by the speed of sound. This gives you the Mach number of the air relative to the car and presumably the air intake. Go to the Isentropic Flow table and find the value of P/Pt for the given Mach number. Take the inverse of P/Pt this gives the ratio of the stagnation pressure to the atmospheric pressure. For choked flow the maximum flow rate is directly proportional to the stagnation pressure Pt. And it calculates the change in pressure as 1.2% at 100 MPH "