CSL breather tube

[Casa de Mesa]

You could buy a stock line and use a heat gun to stretch it out.

Interesting idea... Now I wish I hadn't hacked mine in the first place!!

[SQ13]

You could buy a stock line and use a heat gun to stretch it out.

[zzyzx85]

Does anyone know the ID dimension of the make shift vacuum line/fuel hose that can be used in place of the BMW CSL hose?

I used 19/32" (15 mm) ID PCV hose

[Casa de Mesa]

I have 5/8 tubing connected directly to the end fittings (so no corrugated section).

Exactly what I'm looking to do and what I needed. Thank you!! 5/8" tubing on order!

[DoubleSidedTape]

I have 5/8 tubing connected directly to the end fittings (so no corrugated section).

[Casa de Mesa]

Does anyone know the ID dimension of the make shift vacuum line/fuel hose that can be used in place of the BMW CSL hose?

I have this part on order again after the first one showed up damaged, but it's looking like a mid to late June arrival and I need a workable solution before then. I'm worried this temporary nylon tubing I used just to get the car running will not hold up and I need to drive the car...

I want to say that 0.75" ID will work. The outside measurement of the corrugated section is 0.71" (18mm), but it balloons a bit larger at the plastic fittings (the 90° ones).

Edit: I could most certainly cut mine apart and measure the fitting, but don't want to do so in case I can't source the right size tubing. This "works" for now, but I'm not sure for how long it will.

[ac427]

Related question:

I am using the stock airbox, but I have an oil catch can that I had used on my 02 previously now hooked up to my 05. Is there an easy way to code out this valve or trick the car into thinking its there? I have no issues with vacuum leaks since I put a vacuum bung over the air rail but I am getting an error/CEL for "System test, crankcase breather"

Not really a solution but you could code out the DTC for "System test, crankcase breather"

[DoubleSidedTape]

Related question:

I am using the stock airbox, but I have an oil catch can that I had used on my 02 previously now hooked up to my 05. Is there an easy way to code out this valve or trick the car into thinking its there? I have no issues with vacuum leaks since I put a vacuum bung over the air rail but I am getting an error/CEL for "System test, crankcase breather"

[Fresh1179]

Gonna open this one back up. I’ve been running the OE configuration on my ‘06. Did we ever figure out if this would cause issues. CSL software. This has been killing me for a while because every time I look at it, I wonder if I have it all wrong…

[Cubieman]

I wasn't sure so I just plugged the bung on the air rail with a vacuum cap. But it sounds like the OE setup works fine.

[Smitsky089]

I assume you're not using CSL software? In that case the valve will still be opned/closed as intended. What's somewhat unknown is what happens when running CSL management.

You are correct, not yet at least. Thanks for the clarification.

[terra]

Any conclusions on this one? I've been running Evolve's CSL airbox with Evolve's Alpha-N tune for 2 years and don't think I have any vacuum leaks while retaining the stock post-04 air rail/connector.

I assume you're not using CSL software? In that case the valve will still be opned/closed as intended. What's somewhat unknown is what happens when running CSL management.

[Smitsky089]

Any conclusions on this one? I've been running Evolve's CSL airbox with Evolve's Alpha-N tune for 2 years and don't think I have any vacuum leaks while retaining the stock post-04 air rail/connector.

[terra]

I can test this after I get my car back together if you tell
me how. Is it as simple as taking off the PCV connector and probing the two leads? Checking one/both for continuity to ground?

One of the pins will be ignition switched +12v, the other should be a DME switched ground.

I suppose now that I think of it, you could just move the pin at the DME end to a ground if you want to keep things looking stock without having to worry about what the DME does with that output.

[duracellttu]

For the system to function correctly, you need variable control over the position of the PCV. That's why it's an electrically-actuated valve in the first place, and it's why earlier cars didn't just tee the oil separator outlet to the airbox and vacuum at the air rail.

If you're on a CSL tune, it's not aware that the PCV is even there, so my bet is if the car runs normally, then terra's hypothesis is right: The harness is probably powered by default such that even if the ECU isn't aware of the valve, turning the car on snaps the valve shut and keeps it that way. Then the system functions as if it were an earlier car (e.g. a CSL) having its oil separator connected only to the airbox. I'd love to test that but my cars are '01 and '02, so I don't own a PCV-capable wiring harness.

I can test this after I get my car back together if you tell
me how. Is it as simple as taking off the PCV connector and probing the two leads? Checking one/both for continuity to ground?