GB: CSL Airbox by Haimus Racing

[Epoustouflant]

They have started

He's shipped out 3x and is now on pace to ship 2-3 per week. This should be wrapped up within 4 to 6 weeks.

Here are some examples.

[audipwr1]

another GB going to happen for these - going to order in a few weeks

[Epoustouflant]

another GB going to happen for these - going to order in a few weeks

Unsure - there's an updated trim about to drop. Shadow Line - all bungs in black, along with an updated mold for easier filter fitment.

I'll ask Antonio.

[audipwr1]

that dropped - its on their site. If there isnt a slower ETA to deliver of 5-6 weeks and there is a discount below his listed price+shipping - I am in

[Epoustouflant]

that dropped - its on their site. If there isnt a slower ETA to deliver of 5-6 weeks and there is a discount below his listed price+shipping - I am in

I am working on terms!

[giOsaurus rEx]

It'll be cool if the aftermarket industry created a more reliable flapper integrated in their snorkels. For the price of these air boxes, I don't see how the loss of low end torque is a positive for a street car.

[Tbonem3]

the flap is a silencer aka muffler

[giOsaurus rEx]

the flap is a silencer aka muffler

It also limits the amount of air at lower RPMs. It's been documented at CSL registry at the early ages. I recently talked to Active Autowerke about this and they confirmed it as well. The setup to to prevent the loss of sub 3500 rpm torque would be the way BMW did it with a MAP sensor, IAT, and snorkel with flap. However, this low end loss makes zero difference with a track car. But I prefer to have more area under the curve especially at the lower rpms for my street car.

[Tbonem3]

Image using Active Autowerke in your "appeal to authority" logic fallacy

We should ask Mike at status gruppe too.

BMW, the actual authority, refers to it as a silencer, nothing more. The engine will breathe whatever air it needs to. Limiting available air doesn't help the engine.

Perhaps you've confused posts about flaps being stuck closed limiting power?

[giOsaurus rEx]

Image using Active Autowerke in your "appeal to authority" logic fallacy

We should ask Mike at status gruppe too.

BMW, the actual authority, refers to it as a silencer, nothing more. The engine will breathe whatever air it needs to. Limiting available air doesn't help the engine.

Perhaps you've confused posts about flaps being stuck closed limiting power?

Yea, imagine talking to a BMW shop that tunes BMWs... I'm better off asking people on here who spent $3k like you did on a CSL style airbox if they lost any low end power with no dyno comparisons to justify their biased conclusions. Imagine if I did that! They will probably say I need to cut my rear floorboard to weld plates for topside subframe reinforcement for a purely street car. Do this first, they will say!

m3cutters had a few posts of dyno charts of before the CSL intake and after the CSL intake with no snorkel that showed what I'm talking about. I did some digging a year or so ago when I had a the mod bug to purchase one. And CSL registry forums in the early days had testimony of feeling low on power in the low RPM range when the flapper was removed. If I was truly serious in purchasing one, I would ask Randy from Epic Motorsports as the final deciding factor... but I guess that might be equivalent to asking FCP Euro about it.

This authority you are talking about... did you talk to the BMW engineering team who developed the intake system or did you see the real oem part description? Did they say MAP + IAT was better than MAF?

[Epoustouflant]

Hey Gio,

I believe we chatted on Facebook Groups - I understand your concerns and interrogations.

From talking to manufacturers of CSL airboxes such as Karbonius, Haimus, and others - they don't feel this is an actual problem to solve considering the documented cases of well running S54s with CSL airboxes. They also don't think there's a market for it considering you can source the OEM snorkel - hence the lack of development.

Tuning is probably the primary component to making a CSL airbox work (or not!).

What I can tell you from my personal experience is the OEM CSL tune is somewhat lacklustre, it's what I loaded up to get the car moving knowing I was in for more upgrades this Winter. It runs rich and bogs down in the low RPM - whether that is attribuable to a flap-less snorkel I run is unknown. There are documented cases of OEM CSL cars having these issues.

I plan on getting my car dyno tested in the Spring once the car is back together. I went to see if a 400 crank hp S54 that Obioban sold me on is real

[trinity_m3]

Tempting! very beautiful box.

[zcpm3]

I want it too !

[Epoustouflant]

I want it too !

I'll keep you posted if I have a drop out spot.