Wasn't trying to be derogatory or anything. Just saying that it seemed like A2 is following the RPW "distributed by Accolade" path.

Whether or not they get their own vendor account is up to Phil and you, etc.

 

i have to agree that 90mm seems large

 

edited. by Me.

 

I'm anxious to hear more about the ported cylinder head. I've already talked to Phil about it, but didn't get a lot of info on what exactly is being done.

 

you kind of have to consider that a 90mm throttlebody is effectively useful on a car with maybe 4L or more of displacement, by example of use an Infinity Q45. an equivalent would be our motors on 30psi absolute in the combustion chamber. depending on a turbo's flow, it would at the very least need 15psi of positive boost with a very big turbo. more boost on smaller turbos. if you plan on getting it, do your homework. there is an optimal least piping size for X amount of airflow. if you're not matching airflow for piping diameter, it's all for naught.

i do look forward to hearing about the head work since you guys got a flow bench.

it'll also be important to start educating folks on subie turbos if that's still the turbo flange you guys are going to be using. i'm sure some people will want to go beyond your stage 1 turbo kit.

 

Rhyzin, would you say that having two 50mm throttle bodies would be better than one 90mm? And what in detail would be wrong about one 90mm throttle body? Not enough vacuume, or too much throttle response?

 

i'd say two 50mm tb would be a better choice NA. the dual throttle bodies have an effective aperture of 1250(pi) mm^2 as opposed to the single throttle body's 2025(pi) mm^2. the dual throttle bodies have an effective aperture equivalent to a single 70mm throttle body, but having two throttle bodies increases the effective flow rate at lower rpm. some things that affect a dual throttle body setup is whether or not each throttle body has it's own intake tract as well as plenum design. there's a bunch of stuff, but i'm no mechanical engineer. well at least not yet...

 

for an NA app, the perfect pipe size(neglecting beneficial resonance) is the bare minimum pipe size to maintain 14.7 psi absolute pressure(atmospheric pressure). if the throttle body and intake pipe are too big, you lose air velocity that helps volumetric efficiency.

it's not particularly that you need vacuum since it's good that there isn't any, or that there's no throttle response since technically air is there when the engine wants it, it's just that you lose out on power since VE goes down due to the loss in air velocity.

maybe someone who took fluids can correct me. i'm still running with basic ideas.