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Old 08-25-2007, 12:53 PM   #1 (permalink)
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Default Over bored throttle body for NA

A friend gave me one that he never installed. Would there be anyhting else I would need to do to install it, besides swapping out and basic adjustments, or would I have to do more (cams/gears/etc)??
If it would be worthwile HP wise, I may do it.
I already have intake/ECU/header/exhaust upgrades...
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Old 08-25-2007, 12:57 PM   #2 (permalink)
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Default Re: Over bored throttle body for NA

What is the inner diameter of the throttle body? That will make the biggest difference in the way the car behaves.
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Old 08-25-2007, 02:59 PM   #3 (permalink)
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Default Re: Over bored throttle body for NA

it is +2.5mm larger than the oem one. He picked it up from solomiata a few years back. So I an guessing that it is a 57.5mm unit? I think the stock ones are 55mm....
Not a Huge difference in diameter, but my NA is NA.
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Old 08-25-2007, 05:50 PM   #4 (permalink)
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Default Re: Over bored throttle body for NA

I think with an N/A there are more flow restrictions than the throttle body that could be addressed first but that being said I've never followed that rule either. The biggest affect the T.B.s have on performance is throttle response, larger ones make it very touchy and is hard to tune out tip in throttle bogging even with an ECU so at first you have bogging and in later rpms you have an on/off switch. These effects are usually with much larger T.B.s than the one you have though so I wouldn't worry much but I wouldn't break much of a sweat about the install either for the power gain/ work involved ratio.
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Old 08-25-2007, 07:04 PM   #5 (permalink)
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I ported my throttle body and matched it to my intake manifold.

there wasnt a very noticeable difference at all but I was bored and the car was down for other reasons.
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Old 08-25-2007, 07:31 PM   #6 (permalink)
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every little bit helps..
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Old 08-25-2007, 08:53 PM   #7 (permalink)
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The biggest flow restriction on the NA is the AFM. I'd get rid of that in favor of MS PnP before I bother with putting on a slightly larger TB.
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Old 08-25-2007, 09:05 PM   #8 (permalink)
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Quote:
Originally Posted by raen419 @ Sat Aug 25, 2007 8:53 pm
The biggest flow restriction on the NA is the AFM. I'd get rid of that in favor of MS PnP before I bother with putting on a slightly larger TB.
Even the 1.8's??
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Old 08-25-2007, 10:24 PM   #9 (permalink)
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Default Re: Over bored throttle body for NA

Yeah the 1.8 s is still the MAF just not as bad as the trap door of doom from the 1.6 s.
The next would be the intake piping but you said you took care of that with an intake so the throttle body would be the next in line as far as outside of the intake manifold but again there is more bang for the buck performance to be had in the manifold and in the head. Unless you are boosting( which I know you are not) than the throttle body really wont give you anything you could feel without the rest of the restrictions taken care of. Most people find the throttle body to be more work then they are willing to put into such a small gain. Every bit helps but I would definitely put my effort for a half day into maybe port matching the intake manifold to the gasket where it joins the head or installing a Hondata heat insulating gasket. But you have the throttle body already so why not go for it?
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