GarageQueen

That's ok, I don't sell them. I should start if the going rate is £3500. Turning my attention to the subject of this thread : If bypassing the throttle body heater had the effect of reducing the intake temperature by 10'C, say from 20'C to 10'C, you'd see a peak output gain of about 7.5bhp. With airflow of around 132g/s on Wide Open Throttle at peak power it won't have anywhere near that effect but hey this the internet, why let facts get in the way? Let's try it with 1'C drop, from 20'C to 19'C. Result : a rather disappointing 0.65bhp gain. Bosch Motronic M2.9 is calibrated with the aid of an intake manifold temperature model to compensate for the warm intake manifold heating the Air Intake Temperature Sensor during long periods at idle.

On a 15' C day, with a compressor efficiency of 72% at 6psi on an otherwise stock VR6 the compressor outlet temperature will be around 56' C. With correct fuelling & timing it will provide sufficient airflow at 6000 RPM for an output of around 240bhp at the flywheel or 176KW. That's a 36KW or just over 25% increase over standard. A reasonable return on a 500W investment? Suffice to say that without a creative rolling road or capacity increase, no N/A 2.9 12v VR6 can match that, regardless of the intake temperature.