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      11-04-2012, 12:54 PM   #8
ex deus machina

Drives: 335i E92, 05 Audi S4
Join Date: Oct 2012
Location: a Treacherous Canyon Road in SoCal

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2005 Audi S4  [0.00]
Boost = pressurized air,
Its measured by a pressure sensor which translates it into an electrical signal for the ECU to understand.
Bolt-ons increase the overall efficiency of the motor, either by cooling the pressurized air, reducing restrictions on the intake side or exhaust side.
Originally Posted by E90Company View Post
-You don't increase boost through bolt on's, it's increased through a tune. The factory DME will actually increase boost on it's own at higher altitudes, in order to reach the factory load target.
Boost isn’t increased, the wastegates stay closed longer, to reach the same psi number, so you still get the same amount of boost but the engine has to work harder to get there.
Garage Queen: 2005 Audi S4 4.2L V8, Vortech Supercharger, Vented CF Hood, PSS9 Coilovers, Sway-bars, RS4 brakes, Fast Intentions - Cat-less Downpipes & Full Exhaust, 505AWTQ
Daily Driver: E92 335i N54: JB4 G5 ISO28 w/BMS Flash, quaife LSD, BMS Meth, AA sport IC, BMS Charge Pipe, BMS OCC, Euro Light Switch, M-Sport Kit, Z4 35is Front Rotors, Hawk HPS pads, SS brake lines; 12.1@117mph (stock intake stock exhaust, 225ís RFT)