Re: Intake & throttle body
Replacing the standard throttle body with a 65mm one was one of my early mods, but after researching the idea and checking out dyno results of various replacement throttle bodies, there is no need for engines of less than 200hp. The test vehicle was equipped with an AEM cold air intake, and only measured a 1-2hp gain above 4000rpm. The standard unit does not restrict the engine for these power levels, the money (over 500 bucks for one of equal or better quality than standard) is not worth your gains unless you are going high output or forced induction.
If you haven't checked it out, get yourself a copy of a book we did a group purchase on for club members last year, I think it was, called High Performance Ford Focus Builder's Handbook. It details why replacing the standard throttle body is pointless on a mild engine.
As for air intakes, any pod filters are illegal in NSW (you'd have to check in other states on your laws) and therefore I just run a K+N Panel Filter. For those who don't care, sure, you might get 2-3hp from a new setup.
If you want value for money when it comes to power, first place to look is exhaust and the computer. Get under your car and have a look at the crappy catalytic converter and you'll see what I mean.
EUR04D - Ford Focus
The Blue Flame
Mk II Escort RS2000
How much boost?
Thanks for 2004, crew.