A guy at my school who totaled his 96 accord is selling off some parts. He has a larger throttle body he bought that some company i guess honed out larger. I dont know the exact increase in interior diameter but my question is, Would a larger TB really do much? I can see it would have better flow and could flow more but really unless my IM and runners and all were also enlarged wouldnt it be kind of pointless?

 

Without other associated Powertrain mod's, you will not notice any appreciable difference.
A larg(er) Throttle Body will give you an added capacity to move air, but the stock trim F22 without any additional improvements will not be able to take advantage of it.

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ok thats what i was thinkin, but thanks for clearing that up for me

 

It's akin to putting a Holley 850 Double Pumper on your Mom's Pinto......

 

I have installed a bored out h23 tb on my b2. Noticed a small increase in throttle response. I have the usual I\H\E.

 

I want to do a performance exhaust a CAI and a bigger TB. Would I notice a difference? what if it were tuned to use the increased flow?

 

There are several things working in the background which determine power output.
Displacement
Compression
Volumetric Efficiency

The first two are self explanatory.

Volumetric Efficiency is the ability of your engine to not only suck enough air in, but pump out it's exhaust. The closer you get to the ideal, the more power you'll realize; to a point.
To this end the CAI and a properly designed Exhaust System will definately help.
The larger Throttle Body may or may not.
The problem we run into is the limited capacity of the engine to displace air. It would make no sense to design a system that could flow X Cubic Ft of air, but the engine couldn't.
There could be some improvement if the Throttle Body was undersized to begin with and was the final limiting factor.

Then there's the discussion about all those vacuum driven components which derive a signal from the intake manifold. Put on a large enough TB and you could possibly see no vacuum at certain rpm's. What could that effect?

P

 

I understand VE. Had to learn way too much about it at school. im just wondering how restrictive the stocker is?

 

It's really a subjective answer based on what perameters you set.

For a box stock Accord with no improvements at all, lets say you'd have x% efficiency (stated as a percentage of engine computed capacity (CFM) compared to the TB's actual capacity (CFM)).
If you were to increase the engine computed capacity (CFM) (by mods which allowed higher revs, larger displacement etc) as compared to the same TB's actual capacity (CFM) the efficiency would drop.
At that point, a larger capacity TB would make sense.

For this discussion, in this venue I would think the best advice I could give anyone is to understand that the powertrain (and everything it contains) is a system in which everything will effect everything else.
It's much like the "chain / weakest link" thing.
In this case, the 'system' will only flow as much as it's most restrictive component allows.

As to your question of stock efficiency, I'll leave that to the guys with the flow benches. I guess you could do the math and come up with some close approximation, but ......
would it be real-world?

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