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Old 09-19-2005, 12:08 PM   #1
schooby
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Default ITB's on a H4?

does this exsist?
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Old 09-19-2005, 12:21 PM   #2
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If you do a quick search around this section yoll find some talk about it. I believe i read that it has been done though, but have not seen the setup
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Old 09-19-2005, 02:59 PM   #3
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working on it now, search for my threads
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Old 09-19-2005, 03:10 PM   #4
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Old 09-19-2005, 03:57 PM   #5
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Quote:
Originally Posted by zzyzx
Because cams won't get you the response of ITBs, and cams+ITBs=telepathic response and high power!

+

=


That's like saying "who needs headers with a good cat-back?"

Last edited by mranlet; 09-19-2005 at 04:13 PM.
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Old 09-19-2005, 04:43 PM   #6
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Oh silly me. I'll defer to the experts.
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Old 09-20-2005, 12:28 PM   #7
Matt Monson
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He obviously didn't look at your link and knows nothing about your car.

And the problem with ITB's is they tend to support a very narrow powerband. There may be a lot of peak power, but not very wide...
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Old 09-20-2005, 06:43 PM   #8
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Quote:
Originally Posted by zzyzx


Oh silly me. I'll defer to the experts.
I'm not trying to say that I know more about it than you by any means, man. "who needs ITBs" just seemed like a silly thing to say, and maybe my analogy was a bit too sharp, sorry about that. The thread you linked looks really really impressive, but it just seemed to be a diversion from this thread. I'm not trying to start anything by any means, and I don't know a whole lot about your car (would like to know more and am reading up on it).

ITBs cause peaky powerbands when they aren't properly tuned. Poor attempts at wave tuning can make lots of dips and cancel out any gains caused by other parts. Proper installation and tuning can make a super-responsive mega-flat powerband, regardless of whether you cain peak power or not. If you've ever driven an ITB'd motor that has been tuned properly, the only word that really captures the feel of the motor is "telepathic". I think it's incredible that you guys made that much power on an NA motor, but that doesn't necessarily give you the response of ITBs.

Last edited by mranlet; 09-20-2005 at 06:59 PM.
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Old 09-20-2005, 08:20 PM   #9
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one of the big jdm tuners did it, i believe it was JUN, maybe blitz greddy or one of them though. it was on a gc8 though, but still a eg20. they did dual intake manifolds.
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Old 09-21-2005, 12:29 AM   #10
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found it.
jun superlemon




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Old 09-21-2005, 01:37 AM   #11
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Those aren't ITB's either.....Single large TB before the turbo. Ironically, those plenums look surprisingly similar to units available for rotary applications. I have some pics of parts that I can post up.

In the meantime, here's what we're currently in the process of tuning.... http://www.autox.net/gallery/album64/IMG_2406


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Old 09-21-2005, 10:59 AM   #12
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The JUN Super Lemon most definitely has ITBs - look just above the right bank of cylinders and you'll see the throttle linkage. I have the issue of Super Street that has the feature article that those pictures are from, and IIRC the bore on those bodies is pretty darn big (like 50mm or something) which would probably greatly slow the velocity of the intake air and may loose power for NA applications, but who knows.

The only two Subarus that use ITBs that I know of are the Super Lemon and the SYMS Racing JGTC300 Impreza Wagon (also yellow, as that is the requisite color for having ITBs on a H4 ) Although not ITB, I did have twin DSM Turbo throttle bodies (one per plennium) on my old Legacy Turbo Wagon, but unfortunately have no pictures to share only description and perhaps a crude recreation via photoshop.
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Old 09-21-2005, 11:01 AM   #13
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ironically, those are itb's.
there are 2 of them inside of each manifold. notice how you dont see any throttle bodys on the outside anywhere? the TB's are below the polished mani's. you can see the rotating wheel just behind the oil dipstick. the throttle cable goes over the top of the altenator. the other side you can really see.
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Old 09-21-2005, 11:03 AM   #14
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damn he beat me to it.
yeah the SYMS one was first one i was thinking of.
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Old 09-21-2005, 11:07 AM   #15
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Haha, deserves a pic (however tiny it may be)


Also, an Ebay auction from a while ago, Subaru H12 F1 motor with ITBs:
H12 #1

H12 #2

...try not to get drool on your keyboard.

Last edited by mranlet; 09-21-2005 at 11:14 AM.
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Old 09-21-2005, 10:43 PM   #16
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Okay, I didn't see the tradional style tulips normally associated with ITBs. I wonder what the benefit is on a sealed system such as that....or what it has to do with a NA application....


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Old 09-21-2005, 10:55 PM   #17
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this is either a chop, or they are running like 10 degrees of negative camber
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Old 09-21-2005, 11:33 PM   #18
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10 degrees of negative camber
its a track only car that was made to race on one track alone
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Old 09-22-2005, 11:38 AM   #19
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Quote:
Originally Posted by Storm
....or what it has to do with a NA application....
Just that it's one of 2 cars known to have ITBs, NA or not.
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