kim307

iTrader: (1)

Here's a schematic of my theoretical Nitrous Express N-ter Cooler setup. I know the diagram isn't the most professionally done one, but bare with me. It was done with MS Paint.



Stock configuration is designed so that the hood scoop functions as air inlet which then direct the air into the intercooler. The problem is that the intercooler is sitting on top of the engine and the mere heatshield doesn't do much good in any given condition. Also the airflow to the TMIC is no where near desired level.

Nitrous Express's N-ter Cooler works by spraying the nitrous directly on, NOT IN, the intercooler and thereby considerably lowering the ambient temperature around the intercooler. The problem with this setup when using FMIC is that the spent nitrous might get sucked into the engine. But the schematic above creates a hole in the back of the hood scoop, thereby allowing air to actually flow through the scoop. Right above intercooler is a panel with fins that point opposite direction of the airflow so that it may suck the air out of the engine bay. Then the N-ter Cooler is placed below the TMIC, and when the nitrous sprays, it'll vent through the opening in the back of the scoop rather than it entering the engine bay.

What do you guys think?

Jay Kim

1987RX7guy

iTrader: (3)

Yeah I have seen that cover that has backwards facing fins. I don't knw how well it will work compared to the stock scoop but you have to remember mazda make it a scoop and not a vent for a reason. Lets just hope it was for performance and not cosmetics.

Santiago

nosd13b

whats wrong with getting spent nitrous into the engine? and even if it did somehow get sucked in through the intake it wouldnt be enough to make a difference.

Evil Aviator

I don't think that design would work well because the coolant would have to fight the incoming air. It looks like you have a louver design which may help, but I think that blocking off the front of the scoop, or replacing it with a reverse scoop, would probably work better.

Also, spraying nitrous oxide onto a burning hot intercooler and/or rotary engine is a really bad idea, especially with a design that focuses the resulting blast into the windshield, shooting glass bits and flames into the driver's face. CO2 would be a better idea.

I think an air-liquid intercooler with an ice chest would be better for drag racing. That way you just need to replace the ice, and it will work throughout the whole drag run, unlike the one-shot design of the N-ter Cooler that is only intended for the start of the race.

J-Rat

iTrader: (2)

Or just rig up a ghetto water sprayer to your intercooler. And spray it with ice water during your drag run.

Jarrett

kim307

iTrader: (1)

Why would spraying nitrous oxide be a bad idea? NO2 by itself is not flammable, now since I have a S4, if there was a fire due to PD, that would be......i don't even want to think about it.

The winshield was what I was worried about, but i guess you could mold a bump right after the opening in the back of the scoop that'll help split and lift the nitrous escaping. Also as far as the functionality of the hood scoop, it works somewhat. I know because I have seen it in action. Going 60mph on a freeway, a plastic bag hovering about 6' above my car got sucked into it, scaring the **** out of me.

Even though the class might crack, it won't shatter.

Also the whole point of this is to maybe utilize the stock tmic and for simpler installation. Installing this kit will a lot simpler than installing the whole A2W intercooler setup.

Jay Kim

Evil Aviator

Exactly. The S4 cars are known for PD fires.

I've seen drag cars purge nitrous into their windshields with no apparent harm. Maybe the drag racers on this forum can verify this, but it looks OK (as long as there isn't a PD leak, lol).

Yes, the scoop works as-is, but you are planning on cutting out the back, and introducing a second pressure source from below the IC. The two pressure sources are going to counter-act each other some. The main problem is that in your quest to make the temporary cooling injected gas more effective, you are going to make the long term intake air less effective for cooling the intercooler, as it is going to just brush across the top of the intercooler and shoot out the back. The intake air needs to flow THROUGH the intercooler core for a good cooling effect.

Have you seen the BDC air-liquid mod for the stock intercooler?
http://www.teamfc3s.org/forum/member...php?img_id=808

kim307

iTrader: (1)

Nice. I like.

Jay Kim

scathcart

I built one of these systems myself on my old S5. Worked well.

Just built a spray bore and mounted it below the stock IC, leaving the hood stock. I had no problems with thermonuclear shock.

As for the NOS having to fight against incoming air... well, 1000 psi of pressure tends to be a bit higher than the resultant pressure at any given speed going through the intercooler.

Madrx7racer

Sorry if this seems like a dumb question but, why not put the sprayer right on top of the TMIC? have to scoop draw in air and you spray into the the IC?