thirdgen

iTrader: (26)

For the past couple of months I have been looking into an ITB setup for my car. I understand I can make way more power on a turbo setup, but to me it's about more than making BOOSTED power. I really like the idea of an engine bay that is pretty basic. If I went ITB, I would have a header, and no more big bulky intake manifold. I would have no intercooler, no intercooler piping, no BOV....just a cleaner, basic engine bay.
There are questions I still have no answers for about a setup like this.
1) How would I tune with with my MS if the intake runners are so short? I mean, how do I get a proper vacuum signal?
I asked that question to Jenvey, and they said that I would need to tune by throttle position and crank position. What???
2) What kind of fuel mileage could I expect with ITB's? I got 26mpg stock, I get about 29mpg turbo'd.
3) How do ITB's behave on a daily driven car? My Ducati 916 didn't like to cruise with the cams and chip I had in it. It liked either full throttle or idle. I'm thinking an ITB setup would be similar.
4) How much whp could I put out without swapping in custom cams or high comp pistons?

This might be a direction I don't want to go towards, but I'm just curious. I'm not expecting a lot of feedback on this, cause not a lot of people run a setup like this.
I found this setup:
http://www.jenvey.co.uk/home/standar...45-kit-ckmmz01
When I emailed them, they told me they have a distributor in Florida, and they only have a kit currently for an NB.

I also found a few videos:

nitrodann

ITB's were never intended to make power, they are about response.

A stock engine is not limited by the IM or the TB so why would ITB's make more power without changing anything else?

Dann

thirdgen

iTrader: (26)

I'd love my engine bay to look like this.

I also believe that 14's on a naturally aspirated ITB setup on my car would gain more respect than my car would on a turbo setup running 13's. I mean think about it. If you have a LS-1 camaro and you get beat by a turbo Miata...you'll be like, "that thing weighs 1/2 my car, and I don't have boost...let me boost my car, then we'll see who wins". However, if you beat me, but I still can hang with you, you might say, "that thing is pretty fast, but I didn't hear it blow off. What? It's Not Boosted??? That's pretty mean!"
ITB's change the whole power band. I have read that it's full throttle power from 3000-9000 RPM.

nitrodann

Wrong, the length of them affects where the powerband is, just like length of runners on any IM.

I have an ae86 rally car with All the NA work done including 45mm Quads. They do NOT gain any power unless your IM or TB is a restriction which it is not on a stock miata.

Dann

WonTon

iTrader: (17)

just throwing out numbers here:

If you have a stock TB thats 60mm, that 60mm hole is feeding 4 cylinders. Your TB is your bottle neck. not to mention having to spread that air across 4 cylinders.

If you have ITBs that are 40mm, thats 160mm feeding the engine divided by 4. so technically you have the ability to feed more air into the engine and with short straight runners you get that supply faster.

EDIT: Not to mention that since you wont be running boost that gives you alot of room to punch those cylinders out and get some nice high comp pistons.

thirdgen

iTrader: (26)

Exactly. The intake is not the restriction, it's the amount of air going into the intake that is.

pusha

iTrader: (5)

Kill yourself

/thread

WonTon

iTrader: (17)

This is somewhat off topic, but im thinking about puting some weber sidedafts on my 86 golf, so I have been looking into some of this stuff!

viperormiata

iTrader: (24)

I honestly don't see the appeal. You will make ZERO torque, which is what I enjoy the most with a turbo. However, different strokes.

Good luck, just remember that it takes a lot of money to get where the Fuji car is and the 949 crew is not far behind either.

You won't be "hangin" with any slightly fast cars either.

nitrodann

But its not, if it were that simple bugger the ITBs and just get a bigger TB, if that WERE true you dont think mazda would have just fitted a bigger TB for advertising bragging rights?

Dann

WonTon

iTrader: (17)

Just do a blowthru settup! You will get the best of both worlds.

thirdgen

iTrader: (26)

Pusha...2 things.
Go find some other thread to crap in,
and
**** off.

WonTon

iTrader: (17)

Thats like saying they could have put a better intake on there or even a more free flowing exhaust. They cant cause they have to stick to certain standards. Im sure if they could have they would have slapped a begger displacement engine in there, but that would change the classing of the car. (Isnt there some kinda tax overseas based on your engine displacement?)

Thing is, on horsepower freak builds people tend to swap to a bigger TB to get rid of the bottle neck. Same principle as removing the cat to get better flowing exhaust.

The more air and fuel you can get in and exhaust out, the more eficient your setup will be and make some kind of power!

pusha

iTrader: (5)

Shut the **** up you stupid ******* piece of ****. Your reasons for researching an inferior setup are retarded. If you want to be fast NA, swap in an LSx. IDIOT.

thirdgen

iTrader: (26)

Hey I forgot...you don't own a Miata do you? So what the hell are you doing here? Bragging about your dad's corvette?

VitaminD

iTrader: (14)

why would you spend all the money to set up ITB's when you could have a cheap satisfying turbo?

pusha

iTrader: (5)

U MAD

thirdgen

iTrader: (26)

I am satisfied with my turbo, but I'm like the rest of the community, I always have to be messing around with different setups. I wouldn't even matter if I did an LSX swap...I'd still find something else I'd want to direct my attention towards.

WonTon

iTrader: (17)

I have the same problem!

pusha

iTrader: (5)

YO, WHAT HAPPENED TO TALKING **** ABOUT MY NONEXISTENT MIATA AND THE CORVETTE YOU SAY BELONGS TO MY FATHER?

It's ok, I'm sure being retarded can become frustrating.