I just came into my possession an 88 TII. I am wanting to put a cold air intake on it, and someone told me one for a 240SX will fit in just fine. I'm looking, and to me, it looks like it won't fit, so maybe I'm looking at the wrong one. Any help is appreciated.

 

just custome make your own intake. i used a civic intake, its not cold air but CAI really doesnt make that big of a dif on turbo IMO

 

I guess I just don't understand what is the difference on CAI and regular intake. How does it get the air cold..? I'm a real big newb...

 

by drawing it from outside the hot engine bay. it doesn't actually cool the air.

its a waste on a turbo car, just going to get heated back up in the turbo.

 

yeah on a turbo II you might want a bigger turbo inlet duct though

 

Hmm, well then I guess I'll just call it good on what I get. I was just trying to get rid of the cluster **** that's down there currently. Damn it sucks. Can't see jack. D: Still gotta get rid of emissions and such.

BTW is Emissions = Rats Nest?

 

Rats nest = Part of the emissions systems, yes. Basically, its just a clustering of hard vac lines that once you have your various emissions components removed, you can take out. And as far as the 240sx intake, you have to basically just take the provided intake tubing and couplers and make it work. Its not a direct bolt in affair, no, its just a cheap way to put together a TID (turbo inlet duct.) Remeber though, you can't vent your blowoff valve (at least not w/o a check valve) so make plans on doing both the TID and the BOV all at once.

 

cold air is cold air period, that being said, a CAI won't make any noticeable power gains. The turbo will heat up air from a CAI, but the resulting air temp will not be as high as open filter intakes.

 

on a turbo yorr cold air comes from the cooling of the compressor air through a good intercooler..

a cold air intake is a pipe that extends the filter beyond the engine bay in order to draw cooler air form the atmosphere... the "cold air intake" does no actual work at all it is a big misconseption

Dave

 

of course, i think the term cold air intake refers to the drawing in of cooler engine bay air than having the hot air that an open filter draws in. Remember, a turbo doesn't uniformly raise heat. If I throw in colder air, the turbo will heat the air up to a degree, but the resulting air will be cooler than if I threw in hot engine bay air. The intercooler will also cool both mixtures, but the mixture that will be cooler will be the one from the cold air intake.

That being said, on a turbo, if using a stock air box, you'd see more gains by using a open cone intake because you gain more in the increased intake of air than you lose in mass by using hotter air. If you had a cold air intake, you'd have increased flow and increased mass.

There are two ways to go the cold air route. By a prelude cold air intake, they've been mentioned as having the right bends for our car, relocate the windshield wiper fluid bottle, and cut a hole in your front passenger side. The other method is to buy a cold air box, relocate the winshield wiper fluid bottle and cut a snorkel to give you fresh air from the wheel well. Make sure the box is sealed from any engine bay heat. Both methods, to be done effectively, require cutting in the front.

On my NA, I'm actually using the stock airbox with a K&N drop in rather than a cone filter. Since there's no compression, I believe the mass gain due to colder air outweighs the flow rate of using an open filter.

A general rule of thumb for both NA or turbo engines, if the flow rate is the same, and the air is cooler, you'll make more power. Colder air in means colder air out.

 

If you are eventually planning on doing a front mount, be very careful about how you layout the CAI since many FMIC setups route the piping down through the windshield washer hole.

 

Vmount FTW!

 

i disagree with the colder air in the colder the air out......
cold air makes more power because cold air is denser resulting in better compression.....
the same car will produce more power in quebec during january than it will in san antonio during august.....nothing obserd but defnitly more
so the idea behind a CAI is the outside temp air should never be hotter than the engine bay air temps so by drawing that air in youll see better performance and better compression numbers....
a cone filter vs teh stock airbox just gives more surface area to draw air from therefore forcing more air into the chamber givin you a better a/f ratio and better performance as well

feel free to correct me if im wrong.....

 

You're right. Don't worry.

 

By uniform level, i mean that no matter what temp air goes in, it'll come out at a certain level, say 500 F.

Turbo's do not raise heat to a uniform level, and intercoolers do not cool heat to a uniform level. It's easier to think of it as more percentage based, based on the Ideal Gas law, among others.

Turbo's will heat up air based on two factors, compression and difference in temp between air charge and engine heat. Intercoolers will cool air based on just the difference between air charge and outside air. As such, if you have a colder charge from the beginning, you'll have a colder charge at the end.

Think about it in reverse. If you have two charges, one five degrees hotter than the other going into the intercooler, the one five degrees cooler before the intercooler will still be cooler after the intercooler. Working backwards, if you have a two charges, one 10 degrees cooler than the other (the difference between a cold air intake and an open filter), the one that's 10 degrees cooler will still be cooler after the turbo heats it up. And we know what happens to a cooler charge as we pass it through the intercooler.

Bringing up the cone filter vs. the stock airbox here are the pro's and con's

Cone Filter-
Increased Flow Rate - Pro
Hot air generated by engine lowers mass of air per volume - Con

Stock Airbox-
Restrictive intake lowers Flow - Con
Air being drawn from outside and shielded from heat - Pro

So you weigh the two, If the increased flow rate compensates for lower mass per volume, use the Cone filter. It especially applies to turbos because the hotter air disadvantage is partially mitigated due to compression from turbo. If the reverse applies, and the higher mass of the colder charge brings in more air than the increased flow would, use the stock airbox. At the end of the day, it's the mass of air you put into the combustion chamber that determines how much power you can make. Pick the intake that gives you more mass.

 

I think you mean "combustion" instead.
The colder/denser the air the more O2 you are packing into the combustion event but the compression doesn't change...