jorj7

If you want to talk Water/Meth injection, I added one of these:



A two nozzle system with a 5 gallon tank.

http://928.jorj7.com/meth-inj

soupcan

Sweet! I haven't check your site in awhile, will keep and eye out for an update.

Curious why you don't run Tim's dual air cleaner supercharger inlet set-up.

blown 87

Yea, you need to inject the ADI at more than just the supercharger inlet, but even still, it has to take a chit load of heat out of the intake charge due to evaporation.

Not real sure where it can be done on a twin screw setup with out running some things that seem to be very trouble prone, but I suspect I am going to find out.

It just makes sense to me that the more heat you can take out of the intake charge the better you will be from a power standpoint and the bigger detonation margins you can possibly have if tuned correctly.

I was not wanting to hi-jack this thread, and if the OP would like I will start another thread, but they seem to go hand in hand.

andy-gts

has a person just plumbed the ac output of the cabin system into the intake....that should cool the intake. seems simple enough. and my cabin is cold enough ... might work without too much trouble..just thinking.

jorj7

I use to run his single duct intake before he developed the dual air cleaner
version, but I'm running the DEVEK airdam/splitter which gives me less room to
run the air intake tubes down low to the fenders. Also with the plumbing for the
second heat exchanger in the driver's side fender and the dual oil breather/separators
on each side behind the radiator there's just no space.

rayqblue94

I'm happy and interested to see where this discussion leads

cheers

Ray

blown 87

For supercharged/turbo apps you have to cool the intake charge after it has been compressed.

andy-gts

I was just thinking of compressing 40 degree ac air seeing as some airconditioners are still hooked up on some racers. then you wouldnt have to mess with intercoolers, plumbing , pumps etc...

andy-gts

.....or just move your ac to the intercooler position and have chilled compressed air...probably too difficult to do though

I bet the hp you gain will more than offset the hp it takes to run the ac

rayqblue94

I have found a small spot of 'free' airflow at the bottom edge of the rear bumper cover. I reckon I could mount a heat exchanger on the brackets from the bumper to the bumper cover, this would angle forward (60 deg. ?) to give 5-6" scoop into the airflow but no lower than the bottom of the fuel tank carrier. I am thinking of using the B & M oil cooler 11x11x1.5 " as the heat exchanger.
Can anyone see any problems with such a setup.

jorj7

I put one of my fuel coolers in the rear bumper, of course I had to put some holes in there to help the
air flow (and reduce drag):

pdejong

Has anyone ever tried to spray (mist) water on the external of the heat exchanger, while you are in boost condition, to cool down your intake air? With a water circulating system you are cooling the intake air by heating up water. But if you cool your intake air by evaporating water, you will get approx. 500 times more cooling capacity out of a liter of water than by just heating it up.
By my calc's you would need less than 15 liters of water to cool your the intake air of a 5L 928 engine down 20 degC, for 60 minutes at 8 lbs boost and at 5000 RPM.
I am converting my '90GT to twin turbo's (and twin air to air aftercoolers) and I am going to experiment misting water on my air-to- air aftercooler , every time boost is over a certain level.

Peter deJong
Charleston SC
'83S (RIP)
'90 GT
Our windshield washer reservoir should be adequate to do this.

blown 87

It is done on racing aircraft sometimes, not sure if you would want to do it on a car, might get a puddle of water under the wheels at just the wrong time.
Something to think about for sure though.

Lizard928

This has been thought of before, and does work for short bursts, but it will be quickly overwhelmed in a road racing environment.....

brutus

If you use metal tubing you can just send the water on a trip around the car and it will shed much heat in the process. Just as early 911s had a trombone cooler in the right front fender ( a simple loop of tubing ) later they added a true heat exchanger for more oil cooling and later still an electric fan to blow air over the heat exchanger.