That Is The Way Dinan Does It In Mt View... (archive)

Not that "Dinan way = right way", but when they installed my system (and from talking to a local M3 guy, his system) they removed the intake tube and enlarged the hole. They apparently aren't too worried about water ingestion in Kalifornia.

Thanks for the chat...
Doug

your picture didn't come in, but the M3 K&N sits with the top end pointed straight down and lies on the top of the brake duct. I thought about doing the hole in the duct, but at that point I would worry about water. that compartment where the horn is is pretty sealed up, but if you put that hole there you will likely suck up some water. the snorkel system that hole is meant for goes up to the factory airbox. it isn't likely that water would travel up a tube that far.

jeff

If this picture, compliments of Uberjeph, is the alignment of the M3 filter, it is slightly different then the M Roadster.

The M Roadster's filter also sits on the brake duct and has a hole cut in the brake duct for air, but instead of sitting vertically (as this picture seems to show) it runs horizontally with the end pointing towards the bumper. So the end of the filter in my car sits back just over 2 inches from the front bumper and has access to shielded air there, as well as air from the brake duct, the front grill/air dam and the area around the headlight.

Is the end of the filter show here pointing into the brake duct? If so it would seem that the open ended filter would be a good choice.

I'm not sure the open end would really help a Dinan CAI kit on an M3, the filter top sits right on the brake duct. So the open end would basically end up being blocked by the filter. The M roadsters and coupes probably have a different placement.

My mechanic told me he used a K&N filter on his Porsche 944 turbo and when he took it off he turbo impeller looked like hell, all chipped and the edges of the blades were nicked. This maybe an over exaggeration, so i'll probably be checking the intake for excess dust in the inlets.

jeff

Hello Paul,
Sorry to start off this way... but would you mind posting at the top of the thread instead of the bottom... it would a lot easier to see you question!

Anyway, this IS NOT a K&N manufactured filter. It uses the same materials, but incorporates bigger pleats (increased surface area) and the open top to achieve higher flow rates. In the Dinan size version of this filter it flows better then a 9" K&N. For the hp you are putting out the K&N filter Dinan uses is too small (see this link: http://www.autophysics.com/design.html). I run a 7" filter on my M Roadster which has a Dinan Stage 5 package. Granted the packaging of the CAI on the Roadster is different then the M3, but I bet it would fit just fine. Overall it is a hair over 5" in diameter and is 7" in length with a 3.5" flange.

Cheers,
Doug

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