I am about to rebuild my engine along with some other modifications. Probably the full racing beat exhaust and a FMIC (along with other mods to keep it safe).

Anyway, I was thinking that with a front mount, you could either:

1. Route the intake up to the scoop and make some knid of air box about the size of the TMIC with one of those K&N filters that fits in the stock box. Basically making something similar to the stock air box, but fed by the hood scoop.

2. Make some ducting to route some cold air to an aftermarket filter. I think this would be ver inefficient though, unless the filter was relocated further back in the engine bay.

Did a little searching and found this thread:
There is a diagram about what I was saying in 1.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/air-intake-688231/
&highlight=intake+hood+scoop

Any thoughts? Has it been done? Worth the effort?

 

i would do it, it could have a good effect on induction. who knows

 

My 2 cents.....
FMIC already adds a bunch of extra piping. Adding another 5' of piping to get some cooler air seems counter porductive. There are a couple of shoter routews to get fresh air to the intake. With an N/A I could see it doing some good but, sill there are shorter paths to fresh air.

 

Yeah, I didn't really think about the piping aspect..

 

You could try and make a dozen vacuum lines to make it work!
You'll also have to add a dozen more vacuum lines....

 

You would probly have to seal that up pretty good to make it efficient. Obviously if it were just tossed somewhere near the top mount it would be just as unsefficient as the tmic. A snorkle might work? Keep the intake where it's and route a snorkle down to the intake and fab up some sort of snorkle from the air dam.

Nick86 wrote a great write up, to what he did. Pics are reposted somewhere in that thread.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/got-cold-air-i-do-pics-181680/

 

just go to home depot and buy one of those home dryer hoses they come in various sizes

just cut to length and route it to the filter

 

^^
Thats getting a little ghetto for my tastes..

 

Are you looking for a ram air setup?

IMo weither CAi or ram air, the piping is going to have major restrictive bends going from the scoop to the turbo intake. Yoo much fabrication for something that isnt worth it. just build a cold air intake dumping downwards to catch cold air.
Ram air is only good at hight speeds, and even then i would want something to scoop better than the stock scoop

 

hows that ghetto, gt300, nascar, f1 , and cuircuit racing cars use this method

they will put these lines anywhere from the brakes to the driver, so please explain how is that ghetto- if you can weld or have a fabricator do extensive amount of work just to get a little cold air to a air filter

then thats just a waste a time and money because as a another person just posted, the set up is useless if you are not using it as a RAM air set up

pretty simple, buy 2" aluminum wrap dryer hose, gets some 2" clamps and secretly put it in the front of the car and route it towards the intake thatas all you need

this mod is not going to make you any faster, you will just have lower air temps

 

I wouldnt worry about it at the time, it would be excessive as far as piping goes

 

Yeah, to do a nice job , it would take lots of time. You might want a factory intercooler to copy the shape to make the box, and then havea pipe coming out of it to go back to the throttle. Are you running the factory MAF sensor? That would make it almost impossible and wayyy too much work. Just tkae out a headlight it its a track car.

 

Maybe its not, but I'm just saying I'd rather not have dryer hose running over the top of the engine. I would use it, but route it from the bumper or something instead. I'm just seeing what the input is. I don't know if I'll do this or not.

I would like to get rid of the MAF which is why I was thinking this. If I keep it, I'll just vent some air to it somehow.

 

Whatever you do do not use that home depot dryer ducting for a TID! It can get sucked into your turbo! You should only use hard pipes for a TID!
http://videos.streetfire.net/video/0...-160_87994.htm
^ghetto setup if you ask me.. Dryer ducting held on by a zip tie... You can see the results... On a 20b....

Only thing I'd use that sorta ducting for is for to duct air to an airbox filter(like El Nene 7 said), brakes, driver fresh air ducts. But NEVER EVER EVER for a TID.


The idea of using the hood scoop sounds like it could be possible. Maybe if you made a box that was the same dimensions of the TMIC with the same mounting points, make it seal really well against the hood, and have a tube fabbed from the turbo inlet to the side of the TMIC shell it could work. That would be about 3' of extra piping in front of the turbo with 2 90 degree bends in it, not really a huge amount of piping compared to a 1.5-2 foot TID putting the filter behind the headlight. I believe I've read that its not really a good idea to add alot of significant bends before the turbo inlet though.

 

I wasn't saying use the dryer ducting for the TID. Just to vent some air to the filter. If I relocated the filter I would use some solid tubing.

And, Thats exactly what I was thinking on the top mount intake. Get two really gently bent 90 degree tubes and tie into a top mount box. As long as the bends aren't to sharp I think it would be fine. It would be one off atleast...

 

yeah thats what i mean , now dont hook it up straight to the turbo or that will cause bad juu juu

 

OMG, the guy does a 3 rotor single turbo conversiona nd gimps out on his intake setup.

 

^^
My thoughts exactly... Car is fast though..

 

Oh yeah, I totally forgot, a good intake filter that has a velocity stack built in has been giving good results with almost any car. I would jsut go wwith cold air and a velocity stack than go through the trouble of ram air. Im pretty sure you would have to go pretty fast for the ram air to work

 

not worth it. if you have a FMIC and you want lower intake temps, you should do water/methanol/alcohol injection or a nitrous intercooler sprayer. Or a more efficient turbo that won't superheat the air in the first place.

 

You will never get ram air through the stock hood scoop. It is in a low pressure zone of the hood.
If I ever get ITB's I'm going to try to custom fab an intake box that fits under the hood scoop so I can get ambient air without all the extra piping, though.