spend the money elsewhere

 

Why would you day that?

 

You won't see any gains from either, the stock tb is good enough

Sent from my ADR6350 using Tapatalk

 

Hmmmm interesting because I talk to Dan over at church automotive and said to get a tb before he tunes it because it will make more power with it. And I believe he only tunes cars over there

 

Funny, I always thought it was air velocity that mattered more than volume in terms of a mild N/A setup... There is no point in using a larger throttle body unless you port the RBC and have the intake in the same diameter to match. Either way, unless you have a crazy N/A setup you won’t tell the difference. Your money is best spent else where.

 

mmmmmm from my knowledge i believe that the RBC man. is a 70mm entry soo then it would match a 70mm tb. or am i wrong?

 

I change my previous statement, you won't see any decent gains for the money you pay for a couple more mm's

Sent from my ADR6350 using Tapatalk

 

The 74mm just doesnt seem necessary for his setup.

 

70mm will be your best bet on a mild cam setup but be sure to port match the RBC with the 70mm TB..anything larger than 70mm on a rbc is going to require you to bore out, weld up iacv, rebore, weld, rebore till its right.

 

this is really good info

 

Seeeee I'm not afraid to ask stupid question :bow:

 

 

this was much needed info for me :beerchug:

 

If your trying to break records, make over 300 hp all motor upgrade your throttle body and bore the manifold accordingly. But in my opinion its not worth the 500 dollars + for maybe 5 or more hp and some torque.

 

OP stated he is buying cams for his setup, whats the point buying cams if he is restricting the amount of air going to the engine on a mild NA cams setup, plus the only thing that would cost more than $200 would be an aftermarket throttle body, you can port the manifold to 70mm yourself for only 14 dollars just by buying and using sanding drum or even taking it to a local machine shop which is still cheap.

 

that's a good deal for 500.

 

Spend your money on something worthwhile. If you're doing cams, pull your head and take to a machine shop. Get The head redecked, valve job and ATLEAST bowls blended and intake gasket matched and polished. That sir, is 500 well spent.

 

Decided not to buy it buy thanks for ur input

 

i have a skunk2 74mm TB. hybrid racing has a TB with a 74 inlet and a 76 outlet.
should i try boring the outlet of my 74mm to 76mm along with doing the same to my mani?

 

i have a 74mm skunk2 tb. hybrid racing sells their tb with a 74mm inlet and a 76mm outlet. should i bore out the outlet of my skunk2 tb along with the mani?

 

Ask your GF if she can feel an extra 4mms of rock solid meat......once you get your answer you should relate that to the difference between a 70mm and 74mm TB.

 

Second bump from the grave. I've currently got Injen CAI, RBC, Kpro, stage 1 cams. The driveability suffers a little under 2500 RPM even after the tune. The tuner says the air velocity was lowered by moving to a larger IM and is more pronounced by using the slightly larger cams. I'm great if I keep the RPMs above 2500 (or shift into neutral) - but here are my questions:

I'm installing a K24/K20 frank using 11.5:1 pistons. Will this increase the vacuum where a 70mm TB is now more feasible. I agree that a stock RSX engine doesn't need a bigger TB, but what about after adding a K24 bottom end? Also, is the Injen CAI big enough?

 

Another bump from oblivion, the last question is interesting for me also because im building a frank also with 11.5.1 pistons too

 

Yes buy a 70mm. Reason they can be found extremely cheap. I found a Skunk2 70mm for $60 new in box.

 

Would a 70mm skunk2 TB or Blox TB be beneficial with a port matched skunk2 pro series mani? Or will the stock TB work just as well? Current set up:

Injen CAI
Magnaflow Catback exhaust
Ktuner

Soon to install PLM Race Header Apr '18.