[DeTomaso] determine if JFFR scoops are effective

[Stephen Nelson]

Good morning Joseph.  When I was doing my rear-window flow testing I used a pressure bomb as my "static" pressure.  I wrapped the bomb in towels, put it in a cooler, which I then put in the trunk.  At that point I could look at a relative pressure, always knowing that any changes as the car moved would be compared to the reading when the car was standing still.  And yes, I thought about using the pressure in the car as my reference, but I am pretty sure the inside of the car pressurizes as we go down the road.  Or, perhaps it depresses - don't know.

Stephen

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf Of Joseph F. Byrd, Jr.
Sent: Wednesday, November 22, 2017 5:01 AM
To: detomaso at server.detomasolist.com
Subject: [DeTomaso] determine if JFFR scoops are effective

>From the K Busch discussion, a side discussion was the JFFR scoops.  

What would be the measurements needed to determine if those scoops are effective.  

One of my thoughts would be to use a manometer (digital) insert the sensing side tubing into the scoop until it is at the air filter.  The location of the reference tubing then becomes a concern.  I have two thoughts.   
First is to reference the space where a normal air filter would be getting its air.  Given the pressure at the rear window, it would be a measurement of actual benefit,   
the second thought is to use a pitot in "clean air" and use the static port.  This would be more indicative of the benefit as if on a stationary dyno

ANY thoughts?

-----Original Message-----
From: DeTomaso [mailto:detomaso-bounces at server.detomasolist.com] On Behalf Of Joseph F. Byrd, Jr.
Sent: Monday, November 20, 2017 12:09 PM
To: detomaso at server.detomasolist.com
Subject: Re: [DeTomaso] Kurt Busch Pantera

Here are more ramblings of My troubled mind!

I took a simple Bernoulli conversion approach to get some concept of the magnitudes that are being dealt with by the side scoops, definitely not a true aerodynamics solution.


On Sun, Nov 19, 2017 at 6:49 PM, JFFR <pantera at vtc.net> wrote:

> The side scoops that I am using are 1.5 inches at the widest point and 
> are feeding four inch hoses into the sealed air box. My fuel injection 
> system can flow about 1100 cfm at full throttle. I don't know how to 
> do the calculations, but I am sure that the scoops will supply more 
> air than the engine can use. My engine is 388 cubic inches and and 
> produces full power at about 6300 rpm. The rev limiter is set at 6550 
> rpm and in first gear I need to up shift into second gear pretty 
> quickly to keep from hitting the rev limiter. I have only had the car 
> up to about 140 mph, but it has never run out of power and was still 
> pulling hard at that speed. Public roads can limit how fast you can push a car and safety is always my concern.
>
> I just talked to the owner of the Inde Motorsports Ranch in Willcox 
> Arizona today. If any members of the club want to come here, we can 
> use the track to test this air box set up on my car. The straight is
> 2200 feet long and I can usually get my Pantera up to 120 mph before 
> having to brake for a sweeping right hand turn. The track use is free 
> because I work there and it is certainly nice to be able to do this 
> without having to worry about breaking any laws or endangering the public!