[Bmw doubles]

I know the hot air setup doesn't yield huge benefits but I felt like on the 535 it might being tuned. I removed the air box and custom fit it with silicon hoses and gave it a whirl. It feels like it doesn't try as hard through the rpm range now. Like its breathing better as I'm requesting more power. Grant it its hot air, but I have a few more experiments I will add to to this. Adding a air scoop and port the cool air directly to the air filter and compare intake temps. I also thought about removing the weather stripping around the engine (old school e90 style)

[MavRick]

i'm just not sure the temperature of the air entering the intake makes a difference since it has to go through the intercooler, anyway. i mean...thats why you have an intercooler. compressing the air/heat from turbine wheel will heat it up a LOT more than the ambient temperature....

[Bmw doubles]

True, I'm trying to increase CFM and the airbox is as hot as the engine so I don't think it makes a difference either. Porting more air at greater volume may help...

[paul223]

I think the best solution is fit bigger diameter pipe in front of OEM box, and take out the smaller plastic pipe.

[MavRick]

Originally Posted by paul223

I think the best solution is fit bigger diameter pipe in front of OEM box, and take out the smaller plastic pipe.

yup. its the increase in the volume of air thats gonna make a difference...not the temp. its why i really want a solution to the funnel that plagues the N63 intake as it routes to the turbo. all those pipes before that funnel dont mean squat. theyre just making a bunch of noise....

[Bmw doubles]

Now for part of the experiment where I funnel in higher volume through skid plate scoops with dual ports. We'll see if there an increase of performance and motor bay cooling.

So far throttle response is better and there's more power on the freeway for sure.

[krautmeister]

That's pretty cool. So you gotta cut out an opening and attach that to your skid plate? How sturdy is it? I assume it looks like polypropylene... will you rivet?? glue never works on PP.

[lsturbointeg]

wondering if getting a carbon fiber hood and just adding scoops would help?

[Bmw doubles]

Originally Posted by krautmeister

That's pretty cool. So you gotta cut out an opening and attach that to your skid plate? How sturdy is it? I assume it looks like polypropylene... will you rivet?? glue never works on PP.

Yes I have to cut the under tray, but gonna use a dremel with a disc stone cutter to make the perfect incision. Thought about rivets, but most likely 2 part epoxy. One vent to cool the trans another will be rerouted to the air filter.

[Bmw doubles]

Originally Posted by lsturbointeg

wondering if getting a carbon fiber hood and just adding scoops would help?

Absolutely would work, but the cost of the hood is not worth it. Maybe buying another 535 hood off of eBay, professionally modding it to have vents and then painting it would be cheaper.