duff0000

Is having a 70mm throttle body worth buying for a N/A setup? I heard this will yeild decent gains with FI but am wondering if this will gain me anything more then better throttle respose on a NA setup.

I will on the otherhand be going FI in about a year or less.

Heres the shop im looking at for the TB
http://www.proflowdesign.com/index.html

Silver9k

Hmm...I wonder if this 70mm TB is as good as the spoon...I don't see why not and its much cheaper. Try it out, $155 isn't to bad, and I think stock is either 63mm or 65mm I forget, so it should be some improvement, at least in response.

tizbad2k

larger throttle body does not automatically equate to better throttle response. IMO what a larger throttle boy would do is allow for more potential airflow, atleast through that portion. To find out what you actually gain, someone would need to know the flowbench data for your head, and see if the how close the valves are flowing to there theoretical potentials. Freeing up any retriction will help to get you closer to the potential.

Other than that, just so you know bigger doesnt always mean better, as with everything in life there are tradeoffs. For example, a larger plenum voume will give you worse throttle response, but will allow for more stable manifold pressures, so the ecu wouldnt be jumping from point to point on its fuel/timing maps. But again this is somthing you may not even notice with today technology.

duff0000

^ thanks guys any more opinons?

Silver9k

Well,
http://www.aj-racing.com/catalog/product.p...7&cat=91&page=2

there's the J's TB 70mm outter diameter 64 or 66inner for $365, 7-10hp gain. I'd say the one you found is well worth a try. No reason to spend big $$$ for JDM

edit, found spoon as well http://www.aj-racing.com/catalog/product.p...&cat=106&page=2

no price listed but 4-6hp gain supposedly

twohoos

For F20C, no improvement. For F22C, top-end gains can be had, esp. over 8000 rpm (need programmable EMS to spin that high, but once you do, motor is intake-limited and can use a bigger TB).

CypherAZ

If you are getting a bigger TB, wouldn't you need to get your head bored/tapered out to the same size? Otherwise you are just going to create a bottleneck.

Lickermat

nope , if you oversize the rear of the TB like J's offer you need to match this to the Inlet Manifold. Spoon just open up the OEM unit to 70mm in the Inlet. You will get better throttle response ( more so if you have any induction or airbox mods with a new filter)

It kind of a misguided untruth that adding a TB to a NA S2k yields no improvement, you will get a few BHP in high revs with a noticable improvement in Throttle response and some extra pull at low low revs.

You need to remove the Rad guide and have some induction changes to take full advantage of the TB but they are effective.

If you go for a fully bored out TB with your inlet ports to match then the gains are only increased but again these are gains that need to be part of other mods.

Gruppe-S

I wouldn't expect much whp to be gain with a larger TB. However, you should notice a better throttle response with it.

Tom

Silver9k

Like I said before, and like others have said, I would expect there is simply better throttle response.

Although, a 64mm TB would flow 3.1% more air; a 66mm TB would flow 9.7% more air; and a 70mm TB would flow 23.4% more air.

However, these are just potentials. It doesn't mean that it will actually flow more, but it could. Hence it serves as a larger reservior and would create some better response.