ITB's on a b6, anyone?

[89BG 323]

i think it would be pretty bitchen. so i looked up on ebay: mazda 1.6 ITB and this is what i find:

http://cgi.ebay.com/ebaymotors/MAZDA-MX5-MIATA-ITB-INDIVIDUAL-THROTTLE-BODY-MX-5-1-6L_W0QQitemZ350288986278QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item518ed9c0a6

for an mx-5/miata 1.6 DOHC. any chance it would fit the stock 323 engine?

[jay]

You might a hell of a time clearing the firewall with that. Badass if it'll fit...

[mx-3_4evr]

That will clear the firewall, but I'm sure that this is for the DOHC 1.6L.

[Hot_Wheels]

swap heads im pretty sure there interchangeble

[mx-3_4evr]

I just noticed that the miata 1.6L head it totally different than the MX-3 1.6L head. I'm sure that the head gaskets are the same, but the injector place and cams are different.

[leica]

I know a guy that developed his own ITB systems, although they run around $1600. That's not including an ecu either.

I drove one of his ITB Miatas and it was incredible, I've never driven a car that revved up to redline so fast in my life. I'd rather F/I a DD though, I would ITB a Miata if it was my toy just to mess around in. You'll also use twice the amount of fuel they really suck down the gas

[89BG 323]

i know that it'll fit, without any clearance issues, because it looks to be about the same length overall with the throttle bodies as what the stock aluminum intake is, and it looks like the bolt pattern on the flange is the same. i doubt that it matters if the injectors are placed differently, its still sprayin the gas in there right up next to the head. cams are in the head so those dont really matter. my only real concern is that its for the DOHC miata head. i just wanna know if it'll fit on the SOHC head. and if not, are the heads interchangeable?

and i dont see how it would suck in more gas, because you have one throttle body per cylinder, so you can tune it much finer. i used to have a 72 datsun 240z and when i got it i put a triple weber side draft setup on it, and it actually helped my mileage out quite a bit. it got about 18 mpg when i got it, and after the webers were on i got about 26 mpg... so prior experience says that it is only benefits.

also, would i have to change out my ecu? i dont see why, but i just wanna know if itll work, and considering everything that would make it hard, ya know?

[MD323]

Ecu will be needed since the 323 ecu uses a VAF to determine the amount of air entering the engine.

[mx-3_4evr]

FYI it's cheaper to go with homemade ITBs

[leica]

Yeah look into ITB's off motorcycles, people buy them off ebay. Either way you're going to need some sort of management (ecu) whether it's a megasquirt or whatever.

Also can't remember exactly why ITB's use more fuel but they do, a lot more. Like I said not the best choice for a DD, but if your 323 is a toy go for it.

If you want to see more ITB's check out fuji-racing.com although his website is kinda fubar right now.

Here's the car I drove: http://www.youtube.com/watch?v=MqTquydf22s

[chrmar]

I'd be interested in trying to build an ITB setup for my MX-6....

[mx-3_4evr]

LOL that it uses more fuel! Just to let you know I was getting 25MPG on a ****ty running engine

[leica]

LOL that it uses more fuel! Just to let you know I was getting 25MPG on a ****ty running engine

Well must be different setups, tunes, injectors, etc I guess. I know the Fujiracing ITB's burn more fuel than stock fuel injection. YMMV apparently.

[mx-3_4evr]

it uses less than turbo

[jumpncrash]

yeah, less than fully spooled, but as long as you stay out of the boost I'd expect good fuel mileage on a turbo setup