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SVT Performance (2002-2004) The place to chat about any 2.0L SVT DOHC Zetec engine performance, tuning and exhaust related upgrades.

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Old 03-18-2008, 08:35 PM   #1
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Lets talk about ITBs .....again

I've been looking into ITBs for a bit, and I found a link on a honda site where a DIYer made ITBs for his Integra GSR drag car for pretty cheap, like 300$. He used 2002-03 GSX-R throttle bodies (750 or 1000 , same size those years) and basically welded those to a cut off stock manifold flange with some velocity stacks. This is the link to that article,

http://www.honda-tech.com/zerothread?id=975931&page=2

theres pictures on pg 2. I want to do this on my SVTF but I want to put a plenum over it and use the stock maf. Similar to this guys zetec

http://www.fastraxturbo.net/Images/Photos/DSC_1641B.jpg

Im confident I can make it, and make it fit in the engine bay. What Im not sure is can a stock maf and stock ecu handle this mod? Our stock TBs dont have a TPS sensor that Im aware of, so the only sensor envolved is the maf. Anything that was connected to the stock manifold could be hooked back up to the plenum. I would use the bottom half of the stock manifold so the fuel rail/injectors would be in the same spot. I also want to get the TBs as close to the head as possible so I can turn the runners approx. 45-60 degree's to the right to give longer runner length for a better power band. Obviously getting it tuned would net a lot more power but untill I have the money for that I dont want to make this and have to wait months till i can get a tune from Tom to use it. Feedback?


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Old 03-18-2008, 08:45 PM   #2
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1. the stock intakes are plastic
2. they do use a tps
3. been tried and wasnt worth it on a stock motor since the svt has a dual runner manifold
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Old 03-18-2008, 10:12 PM   #3
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our throttle bodies dont have a TPS?
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Old 03-18-2008, 10:50 PM   #4
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Im probably wrong on the TPS, i took it off the TB to port it and I dont remember seeing one but I could be mistaken.
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Old 03-18-2008, 10:52 PM   #5
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I know the stock runners are plastic, i would have a rubber coupler just like the second piece of the stock manifold. The TPS is a problem, but not unsolvable. Not worth it on NA? regular Zetecs can put 180whp with cams and itbs? Stock svt puts up like 145ish, im sure theres gains to be had.
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Old 03-18-2008, 11:07 PM   #6
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the SVT manifold is miles ahead of the std zetec as it is so the gains might not be what you think.

and i believe that build had a lot of compression on it too, like 11:1.

but if youre still interested, just put a tps on one of the itb's and make one linkage to connect all of them, boom problem solved.

I agree you will have troubles using any piece of the stock manifold, youre better off doing a custom out of aluminum.
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Old 03-19-2008, 12:35 AM   #7
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I'm going to go ahead and be the on this one and say that you do not possess the fundamental knowledge to pull this off. Like I tried telling them dip-shits on FJ years back, once you put a plenum around an ITB it looses it's ideal function and becomes just a manifold that is more complicated and has 4 times the moving parts.
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Old 03-19-2008, 11:08 AM   #8
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Quote:
Originally Posted by jmkreege View Post
our throttle bodies dont have a TPS?
Yes they do, I've had to replace mine.

The problem with ITB's in our cars mainly is placement. Look under your hood, you have maybe 6inches of room and it's at the rear on the engine bay. Not ideal position for ITBs and the cost would most likely out weigh the benefits. A used supercharger can be had for cheap if you want more power.
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Old 03-19-2008, 11:55 AM   #9
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i know they do i was wondering why he thought they didnt. how much did yours run btw? i think mine's starting to go
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Old 03-19-2008, 11:56 AM   #10
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videos i found on youtube. (zetec engines)
http://youtube.com/watch?v=cNWpa_TtRA8
http://youtube.com/watch?v=arNr9meGfqw
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