RestoTII

Alright, so here's my plan.... make the stock position intercooler work better. simple enough right? well here's my first impressions and ideas, and hopefully some people can expand on them and either say it's a badass idea or that it sucks. Either way's alright with me.

Problems
1. Not enough inflowing air from the scoop
2. Vertical intercooler fins aren't very efficient
3. Turbo Lag increases with extra pipes
Solutions
1. Raise scoop slightly and/or indent before scoop (a la WRX)
2. Tilt Intercooler if slight angle is needed, or use sloped fins if more angle is necessary
3. Keep intercooler in stock position with little or no change in piping (since it already is fairly short)

These are just some initial ideas, and it was a spur of the moment idea, so let's hear what you guys think!

B430

it would probobly work better if you lengthened the scoop so the opening was in the higher pressure area at the front of the hood, look at a ram air trans am. you could also add intercooler sprayers, that would make it work better too. I don't think it will ever work as well as a front mount though because being right above then engine it's going to pick up a lot of heat, it won't get as much air as a front mount no matter what you do, and you're stuck with a smaller intercooler than can be fitted up front.

tweaked

iTrader: (4)

You could make a heat sheild out of that heat rejection stuff you can get at Lowes or other big home improvement stors.
What type of intercooler would you use? You won't get good efficeincy out of the stock one.
I do like the idea about the spray

rxspeed87

I dont know if it would work but can you poss like fit a smal 8" elec fan in there?

as you can tell I own an N/A not a turbo

sickboy

hmmm, no jealousy here thats for sure.

the hood idea i kinda like,but you arent gonna accomplish much with it.

TMIC heatsoaks like a ************

there already is a heatshield there, and no room for an electric fan, which would actually be a restriction.

if you set up an IC spray system you are spraying water down onto your electronics, moreso than would normally experienced with rain and such. also it has been shown that IC spray systems do little to change temps. if used correctly they can provide a marginal imrovment, aside from jus being pretty cool. i was thinkin of setting up an IC spray system for my FMIC. autospeed has an excellent write up on IC spray systems.

but really and truely if you want to accomplish anything productive at all with your stock top mount inter-heater. turn it into an Air/Water core..........which they actually function quite well at.

RestoTII

I also thought about spraying, but that adds more complications. Basically, the FMICs are expensive and alot of work to drop into the car (from what I've seen and read at least) so I wanted to think of something that would use the stock position and be alot cheaper. I also thought about using some kind of insulation below the intercooler, but that might interfere with the airflow through it. I'm not too sure what else could be done, but maybe the spur of the moment idea wasn't too good of an idea at all. So maybe I'll start looking into the FMIC

JerryLH3

iTrader: (11)

Just keep this in mind:



You're limited by the location and how much air actually gets there.

jrussell

Very, Very cool!!! Thanks for sharing the Aerodynamic airflow.

That's a good way to learn how to place objects that are concerned with aerodynamics, whether for or against...

Xentrix

What about making a side mount, like on the Z32TT's(90+300zxtt). Right now I've got a sort of ram air setup that flows air from the 'brake duct' in the front of the car, there is a ton of room in there if you remove the muffler from the 6 ports and the washer bottle. If I was turbo I'd try maybe a MKIV stock intercooler or a 300zx one.

I asked rotorsports racing about fitting one in there and they said it was possible.

RestoTII

Jerry - Awesome pic, I saved it for future referencing

Xentrix - Awesome idea. I might look into that, since I don't have the 6 ports (as far as I know) I shoul have extra room where the muffler is. I'll see what I can figure out when I rip a ton of stuff apart in about a month. Thanks for the ideas guys

baix2

well i have the picture in one of my rx-7 catalogue japanese book thingy...i kept looking at it and i just wouldn't understand the air flow diagram..
why is it pointing outward??
i would be nice to see some pressure distributioin of FC also though...

some one please explain

Dyre

Jerry beat me to posting evil's airflow image!

The outward arrows indicate low pressure.

B430

what if the scoop was turned backwards so it'd be in the high pressure area at the base of the winshield? like a cowl hood.

JerryLH3

iTrader: (11)

Yup, I saved it when Evil Aviator posted it a couple months ago.

Breakdown:

Arrows that are pointing towards the car are areas of good downforce. Notice the good amount of downforce on the rear deck? Why would you ruin that with an ugly wing?

rx7_ragtop

That IS the pressure distribution on an FC. Arrows pointing TOWARD the car = high pressure. Arrows pointing AWAY = low pressure. The longer the arrow, the greater the pressure difference from the pressure when at rest. Note that the grill area and the base of the windshield are high pressure areas, as well as the rear of the car... and the rest are all low-pressure areas.

As for making a top-mount that is REALLY effictive, you could weld a tank around it and convert it to an air-to-water like Brian Cain did. ~425 RWHP through a stock intercooler core. It requires some extra parts of course...


Brad

baix2

thx guys
now everything makes sense now....

i am more used to look at press distribution picture with color distribution..not arrows...

well the picture i got from my japanese hyper rev rx7 book is almost the exact same picture above...but with the turbo hood scoop...u know in japan they never had NA model..

and there's an extra picture with the side skirt rear and front spoiler...

also a table was given also comparing the drag coefficient with and without the stock aerokit....
the overall coefficient decrease from .32 to .30...
lift for the front is the same after the front lip
lift for the rear with the help of spoiler decrease from .15 to .8
huge different...

sorry don't have a scanner...
but u guys get the idea

Xentrix

There is a fairly big space under there, you'll end up taking part of the plastic in the wheel well to get at it. I had to remove my fog lights to really have a good opening. The only problem i have is with rain and big puddles, gets the K&N wet...

Evil Aviator

Oh, I would really like to see that TII picture and chart if you or anybody else can somehow scan it!

There are some more 86 aerodynamic side view pics here:
http://www.geocities.com/mcgumrapper/aerodynamics

Hehehe, the arrows are called "vectors", which show magnitude and direction.

Well, I think that most of the SMIC issues have been covered, except for the fact that the outlet air from the SMIC doesn't really have any place to go. Besides, you would need a serious aftermarket hood in order to stick an IC over the engine as large as one that you could cram into the front end. For example, my Spearco 2-182 FMIC core is 20x15.6x3.5", and at a 20 PSI 13B flow rate it is 85-90% efficient and has about 0.5 PSI pressure drop. I really don't see how you would fit something like this over the engine.

BTW, the water spray would work, but would corrode the IC at a much more rapid rate than normal. If you are fully sponsored or have lots of $$$, and the track officials let you do this, then I guess it would be a good idea for drag racing.

That's what tall pylons are for!

ReZ311

iTrader: (4)

wow. according to the chart, I can put the intercooer above the rear spoiler!!!!! RMIC!! lol j/k guys.

BoostedRotors

A guy I know here in Birmingham is actually working on a top mount intercoler upgrade that will be available to everyone before too long. (hopefully) My car took a big crap last night so I am about to rebuild the whole thing and do it right, hopefully before im done hell have them ready!

Evil Aviator

Like this?



Amazing what you can learn from aerodynamics, isn't it?

slpin

iTrader: (9)

no one complains about heatsoak on the 911s!!!

rs_1101

about the best youre going to do is enlarge the hoodscoop, and consider air/water ic or a spayer. or if youre cheap/olschool you can just put a block of ice on the ic.

Project84

This thread was from 2001 and had died with dignity until you guys came along and did this.

slpin

iTrader: (9)

hey hey HEY!
at least i used search!
i deserve some props....