What are you're thoughts on this?

Is it a good idea? is it overly complicated? or what?

Can you explain it in detail. Looks like only one cylinder is connected to an intake plenum of some form and the rest are just chilling for the engine bay. But if you're goal is to have all itbs connected to some form of an intake plenum and such, it's been done before. The one I know off hand is the RB26.

Well, I plan on keeping everything like the AFM so I'll route that one cylinder to the plenum and hook it up to the MAF or what ever yo wanna call it, So it can keep metering how much air is going in instead of spending like 200 - 300 on a fuel management system and having to deal with all those wires.

You'll only be metering one quarter of the air mass entering the engine... Just make all four go to the plenum, if it's made right, it'll still be very effective.

You are going to need to have provisions for the fuel injector mounts too. This would have to be custom fabricated by someone with decent welding skills, and then the mounting flange would need to be machined flat. Not exactly cheap, but might be worth it, dunno. You could turn up the boost tho a bit on the stock mani and might make more power

Wow!

LOL

go MAP and let the trumpets BREATHE

I have to agree with Rage. Also because a MAP setup is far better than going off a MAF. More accurate too. Also, to make what you want and still allow for each cylinder to get the full amount of air accurately without starving one of the back cylinders is not that easy. In the RB20 stock, cylinders 5 and 6 were common for not getting enough air while 1 and 2 got a bit more than optimal. There's a bit of math and engineering that is needed.

ha ha I'll prolly end up going that route.



Yeah, I know a little on that. From what I read the 4th cylinder in the KA is known for not getting enough air into it, but I see what you mean.

so what are some good company's that make map's?

You dont make a MAP or buy one like you do a MAF. It means Manifold Absolute Pressure. You need an ECU setup/Standalone usually that has a MAP sensor and can accommodate this into it's readings. You then tune the engine off of that reading instead of a MAF. If you do run a MAP system, you can negate your MAF and just run straight intake or directly to a turbo.

Is it possible to have my ECU Re tuned to run a standalone system? Or do I have to get a aftermarket ECU?

Your ECU is basically a stand alone system. The other is the "piggy back"; which works in conjunction with your factory ECU.

For what the folks on here tell me, most of our ECUs can't be hacked- theres no chip to reflash. The 2v CA group anyway.

If you have a CA18DET, SR20, probably a KA and VG there's things you can do.
I don't know that you can go MAP from a factory hot-wire.

I have an Apexi, it's considered a Piggy back

The cheapest aftermarket ECU stand alone is the Mega Squirt. Take a look at it. Do a web search. There's a guy on Wiki (I think) with sport bike ITBs and a mega squirt.

I'd like to build one for my upcomming rotary. I'm actually hoping they come out with the MS Ultra by then.

Anyone know if I can go MAP from a factory flap in a Mazda?

so what about this would this work?

http://cgi.ebay.com/ebaymotors/Apexi-SAFC-...sspagenameZWDVW

http://cgi.ebay.com/ebaymotors/Apexi-SAFC-...sspagenameZWDVW

so a Apexi SAFC is what I need for ITB's right? Just wanna make sure I understand this.

and I'm not sure about the megasquirt wasn't that to run injectors independently or something? i know a member here did a write up on it though.

There are people that are working on a speed density (uses a MAP sensor and air intake temp sensor) for the Stanza U12 KA24E ECU, but they're still beta testing. I think they have a version that works, but tuning it is a pain in the ass...
You would be better off with carbs, or just use a plenum and MAF. It's more accurate anyhow.

Edit:
And MegaSquirt is a complete engine management system (like the stock ECU), it's very versatile and can usually be used to run any engine you could possibly think of.

Useing an Apexi to run an ITB is way beyond my skill. I don't know that it could be done.

I've wanted to use the Apexi to run a MAP on both my CA18et, and now my 13b, I never got an awnser. I've never tried it though.

Better start reading up on electronics I figure, The goings been slow, I'm kinda lazy.

Look here; http://en.wikibooks.org/wiki/Nissan_240SX_...KA24E/ITB's

If I remember correctly, Read it, The car made no more HP.

Not sayin if you cam and port it won't make more power. I'm just the sorta guy that thinks; ITBs look cool as hell. There's probably better trottle response both on and off. But the just isn't as much power as a common plenum.

I could be wrong. Show me an artical wt dyno, I'll beleve you.

IIRC, the biggest difference is in the torque, though that's probably just because of the way the intake runners are usually done on ITBs.

I have done a lot of research on itb's recently. the reason for the increase in hp but usually a very small increase in torque is because of the very very low amount of restriction between the trottle body and intake port. using a plenum like the one in the picture and not utilizing a stand alone is pretty much pointless. as far as i know rom tunes dont exist for itb set ups on ka motors. and a wide band o2 sensor would be a must if attempting a piggy back tune.
mega squirt is your best bet realistically. there even is a guy who itb'ed his ka and will give you copies of his fuel and spark maps.

http://en.wikibooks.org/wiki/Nissan_240SX_...d_KA24E/ITB%27s



also remember the itb's give power because less restriction and more air in the motor. to utilize it you need to have a 2.75-3.00inch exhaust, headers and preferably aftermarket cams. more air in more air out!
if you do decide to run itb's and no turbo loose the plenum