Where's your IAT? (CSL guys)

[siamkazi]

I was using the IAT that came with the turner box (this was back in 2021 at Autoclub Speedway here in SoCal in the early summer) when we started noticing idle hunting, lights on dash, and the motor running lean. If I recall, it was reading temps super high, was chatting with Hassan and the suggestion was that the IAT was heat soaking. Came back, used the current IAT and relocated to the duct, had Hassan make some changes, and it's been smooth ever since (including sessions at Buttonwillow etc). Mind you, this is my own story so I'm just sharing my experience.

[beyondm3]

Exactly. BMW Did loads of developement with the IAT sensor in the airbox. Heatsoak or not, allowances in the original CSL tune must have been made to account for the IAT's position.

Fair points.

I'm curious what other symptoms people experience from the heat soaked sensor other than reporting of higher temps. I seem to have only read about higher temp readings and not so much lower performance and the like.

[Slideways]

Exactly. BMW Did loads of developement with the IAT sensor in the airbox. Heatsoak or not, allowances in the original CSL tune must have been made to account for the IAT's position.

Yeah, CSL IAT sensor in its factory location works well, so no real reason to change it. If you search realOEM, the older E34 style sensor was used on cars from 1985-2000. The CSL style sensor was used on cars and bikes post 2000.

[ac427]

INPA or Testo

Also, I'm not sure why the tuner is suggesting putting the Beru (E34) sensor down in the lower brake duct intake tract. The air going into the intake manifold won't be nearly as cold as that area. The engine will be reading a colder air temp and my guess is throwing more fuel into the engine.

On the other BMW engines using this Beru sensor, it is mounted either in the intake manifold or after the air filter. I think that the CSL snorkel or better yet the unfiltered section might be a better location to mount this air temp sensor.

Exactly. BMW Did loads of development with the IAT sensor in the airbox. Heatsoak or not, allowances in the original CSL tune must have been made to account for the IAT's position.

[Slideways]

How are you guys checking the IAT values? INPA or a "hidden" OBC function?

Sorry for the noob level question

INPA or Testo

Also, I'm not sure why the tuner is suggesting putting the Beru (E34) sensor down in the lower brake duct intake tract. The air going into the intake manifold won't be nearly as cold as that area. The engine will be reading a colder air temp and my guess is throwing more fuel into the engine.

On the other BMW engines using this Beru sensor, it is mounted either in the intake manifold or after the air filter. I think that the CSL snorkel or better yet the unfiltered section might be a better location to mount this air temp sensor.

[elbert]

How are you guys checking the IAT values? INPA or a "hidden" OBC function?

Sorry for the noob level question

[digger]

to me the CSL sensor looks better as it would probably have a faster response time than the threaded brass one

[liam821]

https://www.bimmerworld.com/Intake-F...621725323.html

this the guy?

FCPEuro sells this one which is what I used: https://www.fcpeuro.com/products/bmw...or-13621739510 for $17. It's the same scale as the e46m3 CSL IAT sensor.

[marksae]

https://www.bimmerworld.com/Intake-F...621725323.html

this the guy?

Yep, that's the one.

[beyondm3]

https://www.bimmerworld.com/Intake-Fuel/Intake-Sensors/Air-Temperature-Sensor-E36-E34-E31-13621725323.html

this the guy?

[marksae]

Okay, I want to move mine to the area below the snorkel too. Looks like I will get the E34 or E36 sensor and rescale the sensor calibration using ECUWorx.

[siamkazi]

I relocated mine to the air duct below the snorkel/intake, it was after the one on the Turner box was heat soaking so Hassan recommended I relocate to around here. Has been pretty solid since:

[Cubieman]

What is the point of this instead of using the CSL IAT? Why not just relocate the original?

The other sensor is threaded/with a nut so mounting is easier and the sensor portion itself is less prone to breakage due to the difference in design.

[beyondm3]

Sorry, I should have worded my question a little better. I am currently running a CSL tune with the stock CSL IAT in its original location. I want to relocate the sensor using an e34 or e36 sensor. Will I need to recalibrate my ECU?

What is the point of this instead of using the CSL IAT? Why not just relocate the original?

[BMWfanz]

Sorry, I should have worded my question a little better. I am currently running a CSL tune with the stock CSL IAT in its original location. I want to relocate the sensor using an e34 or e36 sensor. Will I need to recalibrate my ECU?

Yea, you need to correct resistance calibration for your sensor. I think you can do it with MSS54 ecuworx software.