Zawn's Dark Horse

NemesisCBR

Boredest Member
Port matching is a must. Dylan and i both have the 66mm i believe. If i recall its been suggested to go 1mm larger on the im at the tb opening for anti reversion.

Aussie said:
I just read through that and didn't see anything worthwhile.

I don't see tapering making a difference, your gaining velocity through your intake, that little bit in the tb isn't going to make any difference. Once air is in the plenum it's shape and the shape of your intake runners are going to control the velocity into the head.
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Its most likely going to be setup dependent and gains are gonna vary based on that. It was proven in that thread, on the individual's setup, that he gained over the tapered setup with a 70mm tb. Spoon originally ran this design and others have used it with great results but everyone one of those setups is again different.

This is one of the older threads ive read before on the tapered tb. The one i linked before is a lot newer. Remember my point is to look at how the options benefit based on your setup and make a decision that suits you. The tb is a small part of the air flow system and isnt just about making power, its throttle response. I expect to benefit on my very mild setup but if i had more aggressive upgrades id look to testing a larger tb vs a tapered.

http://www.team-integra.net/forum/14-performance/15855-bigger-throttle-body-n.html
 

NemesisCBR

Boredest Member
You also have to look at it this way. The plenum and im runners controls the flow to the head but the tb is the part or restriction before that and therefore controls the flow into that part of the system. Large tb supports volume yes but we already know what one too large for the application will do. Now what the taper does is increase velocity into that plenum ensuring its ability to flow optimally into the head. I dont want to make the tb sound like its more important than it is because its not. But it is part of the package.
 

Aussie

Zoom-Zoom
Yea but I won't lie, I need a bigger one. I've just been trying to decide on what manifold and tb. I plan on going with the blackworks and I think the edelbrock victor x.
 


Nick_C78

New Member
redGSRguy said:
Stock ITR TB, supported 210 whp on my old build.
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Very misleading comment. Just because you got 210(What build matters as well) with that TB doesn't mean it wasn't restricting you. That is like me saying my header is good for 130 torque... Yes, you can get up to X power with said item, but you could have gotten that same amount of power easier with having the right item in the first place.

A restriction is still a restriction, even if you got decent numbers with it. Doesn't mean that it is ideal, or that others should use it.
 

ZaWn

New Member
Nick4dei said:
Very misleading comment. Just because you got 210(What build matters as well) with that TB doesn't mean it wasn't restricting you. That is like me saying my header is good for 130 torque... Yes, you can get up to X power with said item, but you could have gotten that same amount of power easier with having the right item in the first place.

A restriction is still a restriction, even if you got decent numbers with it. Doesn't mean that it is ideal, or that others should use it.
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Your suggestion?

-Z-
 

Nick_C78

New Member
Depends how ported your head is and the rest of your set up. I am using a skunk2 70mm TB port matched to the skunk2 pro series intake manifold(manifold runners are not port matched to the head though). Works great for my set up. I still need an AEM cold air intake and a better header, but yeah. For you I would say at the very least 66mm. I also recommend getting a BPI flow stack for your intake. I forgot what intake you have, but hopefully it is 3inch diameter.
 

Aussie

Zoom-Zoom
More like at the most 66mm. Your not going to see any gains over 66mm. 64 would probably be better across the curve and have better response at the sacrifice of 1-2hp up top. The 1 peak hp you gain from going that big is not worth the loss of power down below or lack of response.

But this is just my opinion.

Spend the money on getting a good manifold and having it matched up on both sides.
 

Nick_C78

New Member
True, but generally she is going to be at 6k+ rpm when it matters. And if it is tuned right she will have no issues with throttle response. I would get 66mm. It isn't too big or too small. 64mm might end up being better suited by 1hp at certain areas of the power band for your set up, but I would get 66 to be on the safe side. I for one hate restrictions and buying the same part over and over. Bigger isn't always better, but if your head work is done really well, it is going to flow air like nobodies business. I keep getting told my intake set up is too restrictive...even with the 70mm TB. Elton's words were "I can't believe it is running this strong with that intake". Like I said, I hate restrictions...I keep getting told that word and it is driving me insane. That and my smoking issue... My goal this year is to finally fix the damn smoke issue and eliminate my restrictions. I want this motor to be running strong and optimally.

So basically everything on your car has to work together and be in balance. None of us can accurately tell you what is the perfect one for your set up. Like Aussie said, there are pros and cons to having slightly larger and slightly smaller ones. Also has to do with how well the head is ported. I personally say 66mm, he suggests 64mm. Neither of us are wrong, because we are just speculating which you will benefit from most. I am only suggesting 66mm because I have faith in head work and I don't know the degree of work you are having done.

Oh and I also need to port match my hondata intake manifold gasket, just been too lazy. It is much smaller than my head and manifold ports. So keep an eye on your gaskets. They have to match as well.
 
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