X5M/X6M Custom Short Ram Intake

[rambino]

Hey guys, I see a few people posting about their intake setups.. heres a simple and fast solution that worked for me. Mines a bit dirty but works mint..


-I used Dinan Flat Intake filters D401-0023 / D401-0024 they have the OEM Oval size cut ports that work with the OEM rubber intake elbow

-Modify the driver and passenger OEM intake elbow outlets to be shorter. Tilt Passenger side Filter Up and Driver side Down.

-Remover 2ndary OEM Intake box and filter, Leave Front Section

-Cut out thin heat shield and run it in front of the filters and along the bottom of the OEM intake box to keep the radiator fan wind from blowing directly in. I got some shear/scissors and a sheet of aluminum at homedepot. cut it out, sprayed it black, drilled a few holes and zip tied it down.. its not the greatest looking shield but its functional.

-(Optional) Install custom intake scoops from 600whp s4
http://www.xbimmers.com/forums/showt...=intake+scoops

- Go Fast Bits Diverter Valve OEM Modification: 2x Part T9356 Holds boost better..

Results:

Massive amounts of cold air directed by the scoops thru the OEM intake box directly onto the filters when moving. The filters fit under the hood and flow much better than OEM. There is a little heat soak when sitting at a light but its Not noticeable drive wise as 1st and 2nd are so short and the heat shield does a good job keeping temp down. Turbo Cars compress and heat the air anyway so the bit of stop light heat soak really doesnt affect the power like a NA engine would making this Short Ram Intake a great setup..Its also bad weather friendly so no worries about water locking the engine.. Overall the Turbos are much louder, spool faster, and under full boost and rpm flow great and make great power butt dyno wise..















Cheers

[greddy91]

I would check your IATs... Doubt there's any way you're getting cooler air in this scenario.

[greddy91]

Where did those scoops come from?

[frankenm]

I'm doing something similar ...

IAT's are fairly close to stock - I've had this setup for quite some time now.

[Dieselunlimited]

Running turbine blankets are a must on any turbo application.

They drastically lower underhood temps, increase spool rate, and protect the surrounding components.

Thermal expansion is what spools turbos, not just Rpms. Capture the heat and make mo powa!

[greddy91]

What is "fairly close"? 100* of IAT equals 10% HP +/- ... higher intake temps rob power without question.

So if we're talking 10* it's 1%... I could live with that... but I suspect it's got to be more like 50* which is 25hp robbed... THAT I would try to solve for by pulling in air outside the bay.

[9vapors]

Originally Posted by greddy91

What is "fairly close"? 100* of IAT equals 10% HP +/- ... higher intake temps rob power without question.

So if we're talking 10* it's 1%... I could live with that... but I suspect it's got to be more like 50* which is 25hp robbed... THAT I would try to solve for by pulling in air outside the bay.

I haven't taken any IAT numbers and wouldn't know how to honestly... but until I get all of the parts for the intake I'm making, I am running something similar as well... the piping on the intake is what makes the sound more able to be heard, so this isn't doing much there. The only thing I really notice is the throttle response has improved. The heat soak is most likely ruining any gains. Until I get some aftermarket downpipes and reduce the heat under the hood, it is what it is...

[protecon]

What is the point of this?

[Dieselunlimited]

Guys I think y'all are seriously miss understanding how charged air works!

Not being rude, BUT!!!!

The inlet air temp is only as good as the charged air pipe feeding the compressed air is able to dissipate heat.

We're talking charged air temps in excess of 300+*.

This is why some people run multi stage nitrous on FI motors....

One at the intake, and maybe 1 or 2 more on the charged air pipe.

Friction also causes heat, and with how restrictive the factory box is there's likely 0 loss in power.

If it were a NA motor sure, different story.

[Dieselunlimited]

I'd put money on it you'd gain 2 psi at minimum running this manifold blanket!

https://www.ptpturboblankets.com/col...5-m-x6-m-m5-m6

[9vapors]

Originally Posted by Dieselunlimited

I'd put money on it you'd gain 2 psi at minimum running this manifold blanket!

https://www.ptpturboblankets.com/col...5-m-x6-m-m5-m6

And to install them our cars, you have to remove the heat shields

[9vapors]

Originally Posted by Dieselunlimited

Guys I think y'all are seriously miss understanding how charged air works!

Not being rude, BUT!!!!

The inlet air temp is only as good as the charged air pipe feeding the compressed air is able to dissipate heat.

We're talking charged air temps in excess of 300+*.

This is why some people run multi stage nitrous on FI motors....

One at the intake, and maybe 1 or 2 more on the charged air pipe.

Friction also causes heat, and with how restrictive the factory box is there's likely 0 loss in power.

If it were a NA motor sure, different story.

So you don't think the stock "airbox" which is known as the intake silencer isn't restrictive? RKs intakes make 25hp on the dyno. I'm basically making my intake simply so I can hear the turbos a bit better as I don't really like the sound of the engine much.

[frankenm]

I don’t recall exact numbers but my current IAT runs around 8-10 degrees hotter than outside tempature.

Only issue is sitting still for an extended period of time and as others have said you can mitigate this heat soak by lowering engine bay temps

[Dieselunlimited]

Originally Posted by 9vapors

So you don't think the stock "airbox" which is known as the intake silencer isn't restrictive? RKs intakes make 25hp on the dyno. I'm basically making my intake simply so I can hear the turbos a bit better as I don't really like the sound of the engine much.

Abso-damn-lutely their restrictive!

Horrible design all in the name of sleek and quiet!

[Dieselunlimited]

Originally Posted by 9vapors

And to install them our cars, you have to remove the heat shields

That thing is no heat shield it's a dang hot plate to cook on lol!

[9vapors]

Originally Posted by Dieselunlimited

That thing is no heat shield it's a dang hot plate to cook on lol!

Well that's indeed true... the problem with the design is the heat created and stored by the cats in the downpipes... swap them out and temps cool by a ton.

[greddy91]

Originally Posted by Dieselunlimited

Guys I think y'all are seriously miss understanding how charged air works!

Not being rude, BUT!!!!

The inlet air temp is only as good as the charged air pipe feeding the compressed air is able to dissipate heat.

We're talking charged air temps in excess of 300+*.

This is why some people run multi stage nitrous on FI motors....

One at the intake, and maybe 1 or 2 more on the charged air pipe.

Friction also causes heat, and with how restrictive the factory box is there's likely 0 loss in power.

If it were a NA motor sure, different story.

You're not being rude... you're just spreading slight misinformation against the laws of physics in relation to gases.

PV=nRT - give it a google.

[rambino]

hmm there is no way my intake is sucking in hot air while moving, I will also test and confirm this.. The scoops and intake box direct a large volume towards them.. besides a small amount of heat soak at stop, they are a big improvement. heres an interesting thread on this in regards to turbo cars from the JB Tuner Terry, and that setup isnt even forcing cold air into the engine bay like mine.. but your right greddy, its all theory until I do some actual number testing

http://www.n54tech.com/forums/showthread.php?t=23993


great to see other peoples setups and inputs.

[Dieselunlimited]

Originally Posted by greddy91

You're not being rude... you're just spreading slight misinformation against the laws of physics in relation to gases.

PV=nRT - give it a google.

What's your charged air temp?

Slightly cooler air in will net not much cooler charged air temps.

It's not an air inlet temp issue, it's heat as result of pressure.

I can tell you first hand having seen some underhood temps in some compound turbo setups with inlet temps being 130ish, and by the time both chargers boosted the charged air temp was almost 700* pre intercooler, then few hundred post. The intercooler was also 6x the size of the s63.

The cooling capacity of the s63 intercooler is functional, but not major.


Here's some relevant information!


http://www.e90post.com/forums/showthread.php?t=1140077

[philly42]

In a perfect world, yes it's better to get the cooler air outside the engine bay. Though most people are willing to give up a possible small drop in performance for sound.
There's a huge performance drop in pulling hot air under an NA setup vs a turbo setup w/ charged air cooling. Stop applying NA tuning guides to turbo.

There's a reason why you find a lot of tuning companies focusing on downpipes for turbo cars and CAI for NA cars. You can prove on the dyno sheet CAI for an NA car but not so much on a turbo.

Keep up with the custom work