Can someone please tell me the differences between................

[MAXIMUS Nismo]

Between a intake system (like a cold air system) and individual throttle bodies. What are the pros and cons of each.Not just with 240s but all cars in general. info on our cars would be helpful though.

A guy at ma college has a 1st gen Rex (non turbo)and will be installing ITBs soon.

Why would one want to forgo the benefits of a colder, direct charg of air?

I do not know nor do I claim any knowledge of this topic, that's why I want to learn.Thank you for you replies.

OH SHiiT !!!!!!!!!!!!!!!!..................let me go search real quick.................if I find the answer, I'll delete this thread.

[Daunttless]

Its ok, there aren't any threads on it, let me go find some pictures of ITB setups ( need to find a GTi-R picture : ) and then I'll post a picture of it compared to a 240 and explain everything.

[MAXIMUS Nismo]

my magic 8ball told me you'd b the first to reply.I've seen em on a couple integras and a crazy black AE86 w/an H22 transplant (best motoring vol. 4) But, i still don't know the benefits over a "regular" ole CAI.

[MarkEmark]

I really have no mechanical background to base this on, but I think ITB's would make a much more direct route for the air to go into the intake manifold and then into the cylinders, instead of all the air going into one throttle body, and then splitting up into the different cylinders in the intake manifold...am i right? maybedo i want to know? definitely!

[MAXIMUS Nismo]

I found this in the NOV 02' edition of Super street

[MAXIMUS Nismo]

me thinks logic may be in your favor mark, I was think ing thew same thing, but what about the ambient air surrounding the throttle bodies themselves? Wouldn't that air be warm/hot?

This si still speculating 'cause we don't know the facts as of yet.

[MarkEmark]

Yes the ambient air would be substantially hotter surrounding the air filter...unless you installed some type of cooling duct from the front bumper so the air filter could suck in at least some type of cooler air. My dad has an 1.8 liter Alfa Romeo with dual weber carburators (Sort of like individual throttle bodies in a way, because there are 4 valves that open in the carbs to let air in when the car is given gas), and he used ot have a cooling duct in in from the front bumper to give cold air to the air filter, but had to get rid of it when he upgraded the carbs (I'm not sure how you could make this cooling duct, as my dad's spent 20 years on this car...he even has brake cooling ducts).I love speculating, especially when people can't prove you wrong...!:pface

[MAXIMUS Nismo]

since we speculating, waht about this.A ram air hood, w/ an aluminum duct that eithera.) connects to the ITB orb.)dumps it's cold air right infront of the ITBs

wahtchathink?

[MarkEmark]

It's a good idea on paper, but I don't know how you'd make the "ram air" out of aluminum, or where you'd connect it in the front of the car (unless you moved your battery to the trunk and dropped the extension down in the bumper like a regular cold air intake. I don't know what kind of tubing you'd use either, I'm guessing just like cooling duct stuff, which is convuluted and not that good for flowing air, but much better than nothing. Connectind directly to the ITB would be much better than just connecting somewhere around the ITB and letting its cold air out there...because the cold air would quickly mix with the hotter air or be swept away (esp at high speeds.) BUT, I don't know how you'd connect it to that big air filter that'd be right near the ITB, because if there are 4 individual throttle bodies, it would be a huge, oval shape air filter...you'd need some type of fan thing that would cover the whole air filter, and then I don't know how well the air would flow or how good it would be to rely completely on this "ram air system." However, I'm sure it could be done...

[UnderPressure]

So I've read alot about these in magazines. Aparently they allow for more volume of air and INCREDABLE throttle response. Also, the top end power "goes through the roof"

[Exar-Kun]

well, more than one thing...

heres a rundown: ITB works fine if you remove the electronic controls for your fuel injection (unless you feel like wiring up 4 MAF sensors), and does increase high end horsepower due to a reduced vacuum, but does result in low entorque loss because of the same reason...I suppose you could run a manul fuel program ala stand alone fuel comptuers...but I dont know how well tha works without a input signal...

MORE: The ITs work great for RACE cars. like, engine that get rebuild every 10k miles or something. theres no filter on those things....so a lot of little **** can get sucked into your engine.

PROS: more HP, better response, etcCONS: engine safety, expense, CARB LEGAL(emissions)???, loss of low end torque.

honestly I dont see why you would use this system on a KA24DE or a SR20DE (turbo or non) it doesnt seem worth the effort to me to get a little more high end power...just streamline the induction systems and you'll get where you want to be(its more complex that that, I know..but its my post and I will make my .02 dollars count!)

-chet

[MAXIMUS Nismo]

so what if there was some way to put some little air filters on those things. Wouldn't that combat the liitle gremlins your car would have suck in?

[MarkEmark]

Yes, you wouldn't go with "mini" air filters though, you'd go with one big oval shaped one that covers all the throttle bodies....(correct me if I'm wrong)...Think ITG oval filters on an older, carburated inline 4cyl

[APEXi240]

ITBs do suck in ALOT more air, along with a lot of other crap. There is a kid by me that runs a fully built all motor civic, and he only uses the ITBs when he goes to the track, when he's daily driving it he throws his manifold on.

ITBs are very benificial, specifically on a built motor. The Lotus Elise uses ITBs. Sorry I'm really no big help either, I don't know all that much, just that ITBs sound vicious and I wouldn't mind having them.

Now I may be setting myself up to look like an a*s, but how do you work ITBs with a turbo? I may be completely off, but I thought the compressed air gets pushed through the manifold into head. How does this happen when there are 4 different throttle bodies??

[MaineExport]

Now I may be setting myself up to look like an a*s, but how do you work ITBs with a turbo? I may be completely off, but I thought the compressed air gets pushed through the manifold into head. How does this happen when there are 4 different throttle bodies??

Well, I'll look like an a$$ right along side of you then. I'm sure there must be SOME way to split up the turbo charge into 4 individual TBs. But, the original question was refering to an RX without turbo..... my question was trying to figure out its benefits on a rotary engine.