Fitted the DIY manometer today, and was repeatedly able to record just under 14" of water (peak) at WOT in 2nd gear.
With a manometer, 1psi works out to be 27.68 inches of water. I've pretty well worked out that the GTi6's intake system has, at its highest demands, a 0.5 psi restriction.
I'd say all of that restriction lies in between the intake pickup point (in front of the radiator) and the entry to the filter, as the path from the throttle body to the filter is very smooth.
I'll plumb in the manometer in front of the filter next weekend to see if this is true.
But basically, there's nothing wrong with this intake system. By eliminating all restrictions and having a noisier intake, I'd benefit at best 3 hp at the wheels.
Given that 0.5 psi will only work out to be 5 or 6hp at the flywheel on a 2L motor (ora 2% difference in the GTi6 motor) I find it very amusing all of the claims that airfilter manufacturers make...(5-10% more power etc etc).
One place has a kit that promises 3Kw at the wheels by removing the standard airfilter/intake assembly and whacking on a shiny pipe with pod filter (breathing air virtually right behind the radiator).
Considering a kit like that is breathing air that's much, much hotter than what the factory setup would allow, the power claims these people make suggests an ENORMOUS restriction lies in the factory intake, which I have just proven is not true.
Please tell me when I'm being boring, I'm just trying to help people make REAL modifications to their cars, and save some money on the dud ones.
Cheers,
Adrian
With a manometer, 1psi works out to be 27.68 inches of water. I've pretty well worked out that the GTi6's intake system has, at its highest demands, a 0.5 psi restriction.
I'd say all of that restriction lies in between the intake pickup point (in front of the radiator) and the entry to the filter, as the path from the throttle body to the filter is very smooth.
I'll plumb in the manometer in front of the filter next weekend to see if this is true.
But basically, there's nothing wrong with this intake system. By eliminating all restrictions and having a noisier intake, I'd benefit at best 3 hp at the wheels.
Given that 0.5 psi will only work out to be 5 or 6hp at the flywheel on a 2L motor (ora 2% difference in the GTi6 motor) I find it very amusing all of the claims that airfilter manufacturers make...(5-10% more power etc etc).
One place has a kit that promises 3Kw at the wheels by removing the standard airfilter/intake assembly and whacking on a shiny pipe with pod filter (breathing air virtually right behind the radiator).
Considering a kit like that is breathing air that's much, much hotter than what the factory setup would allow, the power claims these people make suggests an ENORMOUS restriction lies in the factory intake, which I have just proven is not true.
Please tell me when I'm being boring, I'm just trying to help people make REAL modifications to their cars, and save some money on the dud ones.
Cheers,
Adrian