Intake plumbing

[Beejay]

Sounds about right.

When I last had my car on the dyno it was a really hot day.

Opening the bonnet gained 7 kW!

Now I have a smaller radiator and will be fitting a cold air intake over the top.

Ben

[HSVREDSLED]

I would look at an over the radiator system (OTRCAI) made from decent material. There are utubes around of ebay OTRCAI which literally collapse on themselves under wide open throttle.

The boys in blue generally frown on Pod filters more than they do OTRCAI.

And the MAF does not need to stay. Whilst they are still substantially better than the early LS models, gains can still be made via a tune and basically the MAF is wasted weight and space.

I know of some fellas doing custom OTRCAI for FI applications and others. I will invite one of them to make comment.

[Zedn]

I am sceptical about what the real gains are of cold intake systems. They do offer a performance improvement, but at what rev range under what conditions. I suspect your 15kw would be at peak power when the engine is generating heat.

A dyno print out would be interesting to see. Im sure there would be one somewhere on the net.

[cameron02]

Hi Liam,

Yes your right the rubber tubing is metal ribbed and yes it would create some turbulance which is why I went for 90mm id whilst my throttle body is only 75mm id.

In regards to surfaces. The inside surface of the intake should not be too smooth either as this will also create turbulance as the air will stick to the smooth surface.