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Old 11-06-2003, 04:25 PM   #1
SlowMotion
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Default ITB on RS engine possible?

Hi guys, just wondering if ITB (Individual Throttle Body) on a boxer engine possible? i know nobody makes them...but lets say..just lets say...someone decided to make one....would it work on a boxer engine?
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Old 11-06-2003, 05:06 PM   #2
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it's possible. they would sit right on top so it shouldn't be a problem. It would sound INSANE.
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Old 11-06-2003, 05:17 PM   #3
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It is a work in progress.. Josh at Cobb is working on a one off design of ITB's for his personal car. Just yesterday, he said that while they won't put it into production, it may become available as a very expensive custom set up. But don't expect it in the near future. To my understanding he won't put any more work into the ITB's until Trey does some redesign work on the stage II heads...so it will be quite some time.

Not very streetable, but a good way to get around the flow issues of the intake manifold on a going for broke NA build.
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Old 11-06-2003, 05:22 PM   #4
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One of the things I'm gonna do to mine is get another stock TB and run twin TB's / twin manifolds. That's the next step after I finish turboing.
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Old 11-06-2003, 05:24 PM   #5
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how would twin manifolds work?
and how would they benefit your setup?
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Old 11-06-2003, 09:06 PM   #6
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Im building an aluminum intakle manifold with my brother this winter, it will be done by xmas. It is a dual plenum/ dual TB setup. One plenum over one head, the other over the head on the other side, the runners run straight down from the bottom of the plenum. We just have the velocity stacks to order and thats it. Each throttle body will have a cobb-style intake running into each fender.

Dan
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Old 11-07-2003, 03:49 AM   #7
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^ exactly, except my TB's will go into a y-pipe to the intercooler. Err I guess that's backwards, the intercooler outlet will split with a y-pipe to the 2 TB's.

For my little turbo kit, the benefits will be having complete control over runner length and manifold volume, double the airflow without buying an expensive large diameter TB, and mainly the coolness factor.
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Old 11-07-2003, 05:42 AM   #8
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Do I need to bust out that pic of the JDM N/A 2.0 280ps monster again??? It has individual throttle bodies, among other things...
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Old 11-07-2003, 08:38 AM   #9
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Quote:
Originally posted by Kostamojen
Do I need to bust out that pic of the JDM N/A 2.0 280ps monster again??? It has individual throttle bodies, among other things...
Please, do!

D.
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Old 11-07-2003, 11:46 AM   #10
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Quote:
Originally posted by Kostamojen
Do I need to bust out that pic of the JDM N/A 2.0 280ps monster again??? It has individual throttle bodies, among other things...
Hell yeah man, its a must!
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Old 11-07-2003, 12:24 PM   #11
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Quote:
Originally posted by Kostamojen
Do I need to bust out that pic of the JDM N/A 2.0 280ps monster again??? It has individual throttle bodies, among other things...
Absolutely!!!
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Old 11-07-2003, 12:32 PM   #12
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Quote:
Originally posted by Kostamojen
Do I need to bust out that pic of the JDM N/A 2.0 280ps monster again??? It has individual throttle bodies, among other things...
PLS DO! i would luv to see it!
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Old 11-08-2003, 02:19 AM   #13
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%$#%#, trying to find the pic on my HD...
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Old 11-08-2003, 02:25 AM   #14
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Ok, found it...
Attached Images
File Type: jpg outbackyellow2.jpg (42.9 KB, 816 views)
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Old 11-08-2003, 04:02 PM   #15
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Kostamojen...thanks for the pics..i'm drooling already! haha!!
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Old 11-08-2003, 04:42 PM   #16
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btw, is there a website where i can get a closer look at the engine?
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Old 11-08-2003, 07:28 PM   #17
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this is for nasty nate
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Old 11-08-2003, 07:37 PM   #18
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It'd be simple to pull off, but problems lie in the tuning since ITB's don't tend to give off very steady vacuum signals, even with a vacuum plenum for the map sensor. Plus you'd have to run a seperate intake air temp sensor since the stock one that is in the MAP sensor won't work.

There is another problem with getting it to work right... the exhuast ports suck on these engines. The cylinders at the outsides of the motors (1 & 4) have extremely bent exhaust paths, creating some crappy flow in itself.

280hp would be cake... give me a motor that will rev to 10k and is cammed right, add 11.5-12:1 compression, tune it right, and call it a day. Personally, I would choose to start with a 2.2NA motor (shorter stroke, slightly larger bore), or destroking a 2.5L motor.
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Old 11-09-2003, 12:03 AM   #19
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Quote:
Originally posted by SlowMotion
btw, is there a website where i can get a closer look at the engine?
It took me forever to even find that pic originally... The first time I saw this car it was in a JDM Impreza magazine from a couple years back, if that helps any... Had close up pics of the engine, and other things...
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Old 11-09-2003, 03:32 PM   #20
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Quote:
Originally posted by Kostamojen
It took me forever to even find that pic originally... The first time I saw this car it was in a JDM Impreza magazine from a couple years back, if that helps any... Had close up pics of the engine, and other things...

oh..guess i'll just have to give it a miss then..no worries. Thanks for the pic again.
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Old 11-10-2003, 02:40 AM   #21
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Found the pics!!!



http://www.spomotorsports.com/PhotoG...ID=#CustomerID (more at this link)
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Old 11-10-2003, 12:59 PM   #22
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oooh look at this intake design
I like!
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Old 11-11-2003, 03:28 AM   #23
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Quote:
Originally posted by Kostamojen
Found the pics!!!



http://www.spomotorsports.com/PhotoG...ID=#CustomerID (more at this link)

great!! thanks dude! yummy!
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Old 11-12-2003, 09:36 PM   #24
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pretty awesome stuff...

it gives me great ideas for the 1.8L motor...

I dont' hang out much anywhere else but the SE forum...

I've got a project see, actually a couple, one of which is to put a subaru 1.8L in a 1967 porsche 912. the motor would face backward in relation to how it faces now, so the headers would just exit out the front of the block and straight out the back of the car...I may even leave them as duals.

sjd
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Old 11-13-2003, 03:51 AM   #25
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I'd pick anything other than the 1.8l for that idea...

The only useful Idea I have for my 1.8l would be to throw on some WRX heads and some low compression pistons and run it with a turbo. Should work great due to the thick piston walls of the 1.8, but for everything else i'd say screw the 1.8...
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