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Old 02-21-2009, 07:51 PM   #1
trancet
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Default ITB Idea that i saw, opinions?

Was at Motorama today and saw this



Dont know a thing about it other then its on a JDM 2.0, coil on plug, in a 4door 98 RS

What do you think of it? a waste? worthwhile ?
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Old 02-21-2009, 08:06 PM   #2
07wrx4life
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Check this thread out, The guy has since scrapped his Idea and Is selling what he has left but he had It running and said It was awesome.
Read through the thread Its got alot of good Info.

Edit:
It helps If I post the link lol

http://forums.nasioc.com/forums/show....php?t=1175829
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Old 02-22-2009, 12:50 AM   #3
trancet
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^ Very nice, just wondering if this is a less expensive alternative, but does it add enough of a benefit at all due to the location of the ITBs ?
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Old 02-22-2009, 11:13 AM   #4
mt72
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Quote:
Originally Posted by trancet View Post
^ Very nice, just wondering if this is a less expensive alternative, but does it add enough of a benefit at all due to the location of the ITBs ?
I have run ITB's on my previous RSX and in order to have nice benefit you need to build a complet block ... it's not less expensive belive me

i just dream of the day turbo ITB's application
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Old 02-22-2009, 11:59 AM   #5
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Quote:
Originally Posted by trancet View Post
... this is a less expensive alternative, but does it add enough of a benefit at all due to the location of the ITBs ?
I'm certainly no ITB expert, but my thinking is NO, it doesn't add much benefit. I guess the fact that the throttle plates are downstream of the plenum would help throttle response, but you've still go the whole runner to fill when the throttle cracks open. Seems like you're only getting about 1/2 the benefit.

If the ITB experts come in here and say it does add enough benefit then that might be something I'll look into doing.

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I have run ITB's on my previous RSX and in order to have nice benefit you need to build a complet [sic] block
I don't follow your logic here.

Pat Olsen
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Old 02-22-2009, 12:19 PM   #6
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Quote:
Originally Posted by Patrick Olsen View Post
I'm certainly no ITB expert, but my thinking is NO, it doesn't add much benefit. I guess the fact that the throttle plates are downstream of the plenum would help throttle response, but you've still go the whole runner to fill when the throttle cracks open. Seems like you're only getting about 1/2 the benefit.

If the ITB experts come in here and say it does add enough benefit then that might be something I'll look into doing.


I don't follow your logic here.

Pat Olsen
well on a NA engine if you don't add cam high comp piston your effort to have HP gains useless ....
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Old 02-22-2009, 12:52 PM   #7
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The setup in those pics look interesting, though almost every ITB setup I've looked at has a taper formed into it. Those ITB's would have the taper going the wrong way and hurting more than anything. If they are shaped to flow that direction, it doesn't seem like a terrible idea, though the butterflies should be closer to the valves to reap the most from it.

Jay Storm
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Old 02-22-2009, 03:59 PM   #8
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well on a NA engine if you don't add cam high comp piston your effort to have HP gains useless ....
ITBs are a part of the puzzle, just like every other modification one can make to an engine. One of the primary benefits is not to gain power but to drastically improve throttle response - that benefit would be there regardless of whether one had raised the CR.

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The setup in those pics look interesting, though almost every ITB setup I've looked at has a taper formed into it. Those ITB's would have the taper going the wrong way and hurting more than anything. If they are shaped to flow that direction, it doesn't seem like a terrible idea, though the butterflies should be closer to the valves to reap the most from it.

Jay Storm
It's hard to tell, but it looks to me like the end pointed towards the heads is smaller than the entry bolted to the intake plenum. With that said, most ITBs are designed to bolt to the cylinder head, in which case flow would be heading the opposite direction. If these are "typical" ITBs mounted backwards then I agree wholeheartedly.

Pat
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Old 02-22-2009, 04:28 PM   #9
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i was just talking to my buddy last night about ITBs and i was looking at the rb26 stock itbs and thinking i could modify them to work on the subaru head but that is one big project to start and dont have the time right now.
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Old 02-22-2009, 06:33 PM   #10
trancet
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Quote:
It's hard to tell, but it looks to me like the end pointed towards the heads is smaller than the entry bolted to the intake plenum
from what i remember from looking at it, it does, but not a whole lot.
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Old 02-22-2009, 09:00 PM   #11
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Im running ITBs atm and i can tell you the benefit is defiately worth while.

However the pic that the OP posted has the ITBs to high up imo to really be benefical. U need the ITBS to be as close the heads as possible for increased TB response as there is less volume of air to fill...

heres a pic of my setup..



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Old 02-23-2009, 06:05 AM   #12
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Sick, are those modified tgv's?
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Old 02-24-2009, 07:38 AM   #13
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Cool....I had a feeling that butterflies could be fashioned to work inside TGV housings. Any additional clearancing required to allow full range of motion? The walls taper into a different shape (than round) from what I can tell.....

Jay
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Old 02-24-2009, 10:01 AM   #14
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Quote:
Originally Posted by Storm View Post
Cool....I had a feeling that butterflies could be fashioned to work inside TGV housings. Any additional clearancing required to allow full range of motion? The walls taper into a different shape (than round) from what I can tell.....

Jay
they were no doubt done on a CNC by....crap, I can't remember the aussie company who makes the pretty cnc intake manifolds
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Old 02-24-2009, 07:13 PM   #15
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Quote:
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they were no doubt done on a CNC by....crap, I can't remember the aussie company who makes the pretty cnc intake manifolds
I can tell u right now that they had nothing to do with the TB set up.

Kris
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