ITB, how much more power?

[oneday]

Originally Posted by oneday

Isn't this motor supposed to be direct injection? Are ITBs even an option with hyper-pressurized fuel delivery?

Originally Posted by serialk11r

Why wouldn't it be?

No idea...my understanding of DI and ITBs is limited...thus my question.

A little hunting in Google Park has resulted in me learning that it is possible--and as sexy as ever.

[Dave-ROR]

Originally Posted by serialk11r

Speaking of ITB on DD, don't they usually have sketchy filter setups (=faster engine wear from the random dust and shit)? Do people ever put proper filters on them?

Depends. A lot of people don't but there are options for doing so. The last one I worked out we put a filter on, it just covered all the ITBs and mounted to a plate sandwiched between the throttle bodies and the horns.

I've seen plenty of race/track cars without them but 80% or so of the street driven/DD ones with ITBs that I've seen or worked on had filters.

[Matador]

ITBs = better response, better top end. Useless without supporting mods though. And You'd probably need an aftermarket ECU to run them.

Originally Posted by ichitaka05

Subaru or Toyota, we're screwed on ECU part. Both of em are nightmare

This right here is the truth

Originally Posted by 1660

In SoCal, I hear there're ways around it. I also hear that some people keep their car registered in AZ to avoid the ETC.

Wait what?

ETC = Electronic Throttle Control ......

Originally Posted by Dave-ROR

ITBs can be a PITA the get tuned right. And it's going to be pretty pointless without the need for a whole lot more air coming in the motor. I've used ITBs before but never saw gains unless the motor was built (cams, high compression, etc).

Truth.

[Matador]

Originally Posted by oneday

No idea...my understanding of DI and ITBs is limited...thus my question.

A little hunting in Google Park has resulted in me learning that it is possible--and as sexy as ever.

That's methanol Injection. E9x M3s don't come with DI IIRC.

[1660]

Originally Posted by MatadorRacing_F1

Wait what?

ETC = Electronic Throttle Control ......

I thought he meant emission testing cycle. I don't think he meant TBW.

[tranzformer]

Originally Posted by 1660

You don't know SoCal. I've seen ITBs on DD.

No doubt I'm sure there are people that do it on their DD. But that makes as much sense as a hole in your head. I was just saying that I wouldn't run ITBs on my personal DD.

[Leeky]

You know what...

Originally i was dribbling over the thought of getting a Turbocharged FT86...

But as we get closer and closer to its release it doesnt bother me that there is no sign of a turbo#d model anywhere as im more looking forward to a nice high revving NA and then putting throttle bodies on it

Im sure with ITB's, Full Exhaust, Intake, Link G3 ECU (Maybe even cams, depending on what we get on the production car) and a good tuner to set it all up it would be quite a noticable power increase

And then there is the sound!

[Neutral_Eyes]

Originally Posted by 1660

I thought he meant emission testing cycle. I don't think he meant TBW.

Matador is right in this case, I meant electronic throttle control. I just see ITBs being more of a headache than they're worth, especially if the FT has ETC. ITBs sound great, but I'm sure if Yamaha tunes the intake, it'll sound great as well. On a boxer, I think I'd rather listen to the exhaust anyway.

[fatoni]

i love the sound and cool factory of irtbs as much as the next guy but dollar for dollar it isnt going to touch a halfway decent turbo or supercharger

[Dave-ROR]

Originally Posted by fatoni

i love the sound and cool factory of irtbs as much as the next guy but dollar for dollar it isnt going to touch a halfway decent turbo or supercharger

Assuming the stock intake manifold and throttle body provide enough flow to all the cylinders then you'd see more gains from a cold air intake than you would ITBs, let alone even a junkyard turbo setup. ITBs really won't give you much over a properly designed factory intake UNLESS the engine is modified to a point where the factory IM/TB simply won't provide enough flow to all cylinders.

[1660]

Originally Posted by Dave-ROR

Assuming the stock intake manifold and throttle body provide enough flow to all the cylinders then you'd see more gains from a cold air intake than you would ITBs, let alone even a junkyard turbo setup. ITBs really won't give you much over a properly designed factory intake UNLESS the engine is modified to a point where the factory IM/TB simply won't provide enough flow to all cylinders.

Would it be realistic to expect a 10% gain with a larger TB/CAI and an ECU piggyback?

Also, you don't know what you can do with the DI.

[Dave-ROR]

Originally Posted by 1660

Would it be realistic to expect a 10% gain with a larger TB/CAI and an ECU piggyback?

Also, you don't know what you can do with the DI.

Without one of these engines being available it's impossible to say what power could be made with x, y or z. Intakes can be designed for various purposes and in some cases aftermarket intakes can add very little power, or they can add a decent amount.

I haven't used a piggyback in years :P I don't even know what brands/models are out there these days.

I've also never worked on a DI engine, so I lack the experience to directly relate what I know to these motors outside of basic principals.

[Dimman]

I'm betting you could see gains with longish duration cams (272-280), well developed headers (proper sizes, lengths and venturi collector), and exhaust.

However there could be a wait for the cams, especially if they incorporate a profile-switching lift change element. Without the cams, not too much point going aftermarket ITBs.

And as for the ECU mods, this is likely going to come from Subaru, and we will hopefully have COBB's Accessport tuneability (just take it to a pro, though...)

If we are REALLY lucky (or not depending on how much they leave on the table tune-wise) Yamaha will give it to us from the factory like the late-model 4AGEs.

[1660]

Originally Posted by Dimman

I'm betting you could see gains with longish duration cams (272-280), well developed headers (proper sizes, lengths and venturi collector), and exhaust.

However there could be a wait for the cams, especially if they incorporate a profile-switching lift change element. Without the cams, not too much point going aftermarket ITBs.

And as for the ECU mods, this is likely going to come from Subaru, and we will hopefully have COBB's Accessport tuneability (just take it to a pro, though...)

If we are REALLY lucky (or not depending on how much they leave on the table tune-wise) Yamaha will give it to us from the factory like the late-model 4AGEs.

What about the DI? Or are you talking about going regular FI?