Where's your IAT? (CSL guys)

[heinzboehmer]

Thanks for the insight.

1. I didn't expect to plug the very outside edge, but the inner opening.

2. Hoping to find a plug with a tight enough fit so it stays in place.

3. Looking for the least visible/protruding solution.

Fair enough. Keep us posted with how it goes!

Not sure if this is still useful, but engine bay was half taken apart so I took these measurements.

ID of bung:



OD of bung:



Depth of bung (caliper is set up like that just for the pic):



ID of part where o ring goes (this was also measured non-stupidly, but caliper is set up like that for the pic):

[Tbonem3]

Thanks for the insight.

1. I didn't expect to plug the very outside edge, but the inner opening.

2. Hoping to find a plug with a tight enough fit so it stays in place.

3. Looking for the least visible/protruding solution.

[heinzboehmer]

That's a little Jared aka bulbus for me. I might have to though. I'm going to try some blind plugs first.

I'm not entirely sure a blind plug will work. The port has a slit in it and the actual sealing happens with an o ring further in. Pic for reference:



Plus, that part of the airbox isn't seeing a vacuum continuously, so I wouldn't trust that the plug won't fall out. You'll likely need to use a cap like shown above or a spare sensor. Could maybe even 3D print/machine something that clips in using the same mechanism and has an o ring at the end for sealing.

[Tbonem3]

That's a little Jared aka bulbus for me. I might have to though. I'm going to try some blind plugs first.

[zzyzx85]

I'm using one of these to cover the OE IAT port.

I have a few more somewhere around here if anyone wants to buy one.

[Tbonem3]

BUMP

Anybody using anything other than a spare/bad IAT to plug the hole in a karbonius airbox?

I have the M5 IAT sensor, not E46 CSL, so it won't fit, plus I want to put it closer to my ducting anyway.

Thinking that a black rubber plug (blind plug per BMW) would be nice and discreet, but I don't have measurements yet. Anyone know the ID of the Karb's IAT port?

Thanks

[ATB88]

Appreciate it!
What are you using to plug the stock CSL sensor bung? I was thinking to just put the spare CSL sensor in the socket to plug the hole if I run the IAT relocation kit with the e36 sensor.

Yeah I just left the stock CSL sensor in the bung.

[BMWahba]

I don't, but can take one next time I go out to the car. Yeah honestly just drilling into the side of that small plastic duct that goes into the engine bay from the bumper brake duct, I just picked a place on the duct at random




Isn't the issue with putting the CSL sensor anywhere but the stock location that it's an exposed wire sensor (unlike the E39/E36 sensor), so it'll start to malfunction as it gets dirty? That guy reports good success with the CSL sensor on the snorkel but I don't think that would hold up long term. I think the CSL sensor is only usable if it's behind a filter, which it won't be if it's anywhere but the stock location bung. Thoughts from experts? Would like to be wrong about this

Appreciate it!
What are you using to plug the stock CSL sensor bung? I was thinking to just put the spare CSL sensor in the socket to plug the hole if I run the IAT relocation kit with the e36 sensor.

[ATB88]

Have a photo of where you mounted it? Are you guys just drilling into to get it mounted?

I don't, but can take one next time I go out to the car. Yeah honestly just drilling into the side of that small plastic duct that goes into the engine bay from the bumper brake duct, I just picked a place on the duct at random

I've recently read that the CSL IAT sensor is less prone to heat soak. The measurements here: https://forums.m3cutters.co.uk/threa...esults.121512/ seem to support this, but could just be noise. They're also missing a "CSL IAT at stock CSL location" data point which would be nice to see.

Anyone else make any measurements like this comparing the "US" sensor vs CSL sensor air temps at different locations?

Also wondering if anyone has tried putting some kind of heat reflective insulation around the part of the sensor that sticks out into the engine bay.

Isn't the issue with putting the CSL sensor anywhere but the stock location that it's an exposed wire sensor (unlike the E39/E36 sensor), so it'll start to malfunction as it gets dirty? That guy reports good success with the CSL sensor on the snorkel but I don't think that would hold up long term. I think the CSL sensor is only usable if it's behind a filter, which it won't be if it's anywhere but the stock location bung. Thoughts from experts? Would like to be wrong about this

[Anders93]

I've recently read that the CSL IAT sensor is less prone to heat soak. The measurements here: https://forums.m3cutters.co.uk/threa...esults.121512/ seem to support this, but could just be noise. They're also missing a "CSL IAT at stock CSL location" data point which would be nice to see.

Anyone else make any measurements like this comparing the "US" sensor vs CSL sensor air temps at different locations?

Also wondering if anyone has tried putting some kind of heat reflective insulation around the part of the sensor that sticks out into the engine bay.

[BMWahba]

Relocated it to the top of the little duct that feeds up from the bumper with a US spec sensor and switched my tune to US spec IAT scaling. Much better now: 25-40 above ambient at idle, but in motion it drops to 2-10 above ambient. But now the real question is: am I just lying to my DME?

Have a photo of where you mounted it? Are you guys just drilling into to get it mounted?

[x Spades x]

Looks good. I would still go with the Generic sensor though like Cubieman. I feel like the CSL sensor is prone to more damage if it’s before the filter. (That’s how it is on my streamline airbox and I can already see a few bugs/debris on the filter)

Mines has been in this spot for 70k miles... looks perfect

[x Spades x]

Very nice! Where did you source that IAT female connector fitting that I assume is glued on?

The sensor clips into the threaded coupler... and the coupler screws into the charge pipe. No glue involved.

[COVID-19]

Here is mine... drilled upstream into the charge pipe. My temps are 2 degrees above outside temps.

Looks good. I would still go with the Generic sensor though like Cubieman. I feel like the CSL sensor is prone to more damage if it’s before the filter. (That’s how it is on my streamline airbox and I can already see a few bugs/debris on the filter)

[Cubieman]

Here is mine... drilled upstream into the charge pipe. My temps are 2 degrees above outside temps.

Very nice! Where did you source that IAT female connector fitting that I assume is glued on?