biggyrap

I own a 2003 S2k. I have found a 70mm throttle body by Skunk http://store.skunk2.com/pro-series-t...e-body-94.html

I'm wondering if this is the appropriate throttle body for my model, and does this require special tuning after it is installed.

If this is incorrect, a better solution would be appreciated.

Thank you S2KI

zeroptzero

The opening of the intake manifold is about 64mm , any throttle body diameter above that is useless unless you port match the manifold to the throttle body. An 6mm port match is quite a bit of work and alot of material to remove, so you will want to remove the intake manifold to do it safely. After all that I am still not sure if a stock engine can make use of all that extra airflow capacity.

bewareofthepoop

Many people bore out the opening of of there intake manifold to make this more efficient and if you do this make sure you take it off so you dont get any metal shavings in it also you will not need a tune.

Importedpower

I think i am going to call bullshit on the "no you dont need a tune"...

Your car will run like shit.

zeroptzero

I'm running a J's Racing throttle body which is 64.5 mm vs. the stock 62mm TB. I port matched the manifold for the extra .5mm and that produced a lot of metal shavings, so 6mm would create a lot of metal. Definintely plan on pulling the manifold.

Arthas

What if you bore the manifold to the size of a stock 06+ ap2, what throttle body would be best to replace the oe with?

sleeper15

i'm interested in this as well. i plan on getting the spoon venturi throttle body down the road.

zeroptzero

I think the Spoon TB fits fine with an ap1 manifold, the distance out the back of the Spoon isn't any larger.

s2000Junky

SOS TB, 70mm at the face/64mm at manifold. Manifold opening is 62.5mm from 00-05. Hone the manifold opening to 64mm to port match. I performed this operation on my and friends car, removal of the manifold is a ton of extra work not needed in this case. You can effectively stuff the manifold runners with rags and use a shop vac to suck out the dust/shavings as you work, between both measures I was able to effectively keep everything out of the engine. Its a worthy mod NA or FI, but FI will see more benefit. NA it is possible a re-tune will not be needed, because the amount the afr will lean out isn't enough to warrant additional fuel, unless you were already riding the line of needing fuel. Its worth the added response and about 5whp NA. FI its worth double that easy and more fuel is required. I saw a full point leaner before and after FI myself at the wideband, that's about the same as adding 1psi, so I figure I made an easy 10-15whp from this. A 70mm+ at the face and manifold TB will require welding/filling of the water port and then a re bore, this will require removing the manifold.

06+ has a 68mm manifold opening and no water port to deal with.

BalladeSports

With our 69mm Big Bore Intake Manifold and 70mm Skunk2 throttle body we gained 8whp after tuning. Before and After.

http://www.balladesports.com/product...ntake-manifold - In Stock

http://www.balladesports.com/product...-throttle-body - In Stock

kaotik25's S2k
https://www.s2ki.com/s2000/user/83798-kaotik25/
2000 Ap1 S2000: Before 60,xxx miles+
Mods - 2.2L 04 Motor
Ballade Header
Berk 3" Header back exhaust
Supertech Valve Train
AEM EMS v2 ECU - Tuned


Kaotik25's S2k
https://www.s2ki.com/s2000/user/83798-kaotik25/
2000 Ap1 S2000: After 60,xxx miles+
Mods - 2.2L 04 Motor
Ballade Header
Berk 3" Header back exhaust
Supertech Valve Train
AEM EMS v2 ECU - Tuned
Ballade 69mm Bore Intake Manifold
Skunk2 Alpha Sereis 70mm TB



KUSHY'S S2k CR
https://www.s2ki.com/s2000/user/76336-kushy/
Just for reference, here is a dyno we did on a 2008 S2k CR: 25,xxx miles
Mods - Ballade Header
Berk 63.5mm test pipe
Stock Exhaust
Hondata Flashpro - Tuned



IMO this CR would have broke 240s whp if it had a bigger exhaust, but pay close attention to the fact that 06+ S2ks have a 69mm bore intake manifold and a 65mm TB.