Alternative CSL MAP sensor
 

Given that some of you probably don’t venture over to m3forums often I thought I best repeat Map sensor thread here!!

If you didn’t already know the original CSL Map sensor is now NLA, in place BMW have released a replacement sensor hacked together from a French car. Aesthetically it is a disaster in my opinion. So I’ve come up with an alternative - and I am going to assert intellectual property over it (such does not extend to vehicle owners wanting to fashion their own, but only just to stop BMW from selling my idea and profiting from it) and just so I can take legal action against them if they do - sort of in the same fashion that they go after true enthusiast owners for no good reason.



As we all know the original CSL Map sensor is no longer available and the BMW new replacement sensor seems very hacked together. I have finally had time to test my other alternative sensor.

So I thought I'd start a thread in here to update the progress from this original thread:

http://www.m3forum.net/m3forum/showthread.php?t=589529

And a repost of what I wrote on page 2 of the above thread:


There is a little known fact that the CSL map sensor was actually just a generic Bosch item with a bespoked casing.

BMW actually removed the reference to its part number in later map sensor productions.
Original reproduction sensors with no correct Bosch part numbers
https://farm5.staticflickr.com/4441/...965aee97_z.jpg


Here is the original CSL Map sensor showing its part number 0 261 230 115
https://farm5.staticflickr.com/4384/...651aabc4_z.jpg

But it is actually just a Bosch 0 261 230 series sensor in Formula DS-S2 with 3 pin plug.

https://www.bosch-automotive-catalog...26autoLoad%3D1

If you search all Bosch map sensors in 0 261 230 form you get about 450 different variants but only about 40 in DS-S2 Formula form and even less in 3 pin configuration.

0 261 230 058 is one of those ones that appear.

But through my research I found another that I thought was a better fit aesthetically. It carried part number 0 261 230 101. This coincidentally was used in an Alfa 3.2l V6 engine. It seemed logical to me.

https://farm5.staticflickr.com/4437/...4ffb7b82_z.jpg

The dimentional drawings was also very similar to the CSL sensor. However upon receiving it I noticed whist it bolted up almost perfectly the sensor nose was little longer and needed to be spaced up by around 1.5mm and the O ring off the original CSL sensor to have a snug sealed fit. Easily enough done really and BMW could have easily used this sensor with the addition of an adapter plate.

https://farm5.staticflickr.com/4436/...aa39bf93_z.jpg
https://farm5.staticflickr.com/4410/...5d298828_z.jpg

I tested the sensor reading on the bench and it appears to confirm that the scaling was exactly the same as the Original CSL one.

I haven't however had time to test this on a car yet but I will do so when I get some time. But from what I have researched it will function exactly the same as the OEM CSL one without any need to change scaling in the DME software. The wiring is also made easy by adapter harness you can readily buy from BMW.

Plug end on the MAP sensor is just a generic Bosch 3 Pin common rail diesel injector plug part number 1928404072 or 1928300599 or 1 928 403 966 (Febi does one also and it's part number is 5000157024671)
https://farm5.staticflickr.com/4473/...15659f2a_c.jpg

The CSL plug harness adapter pigtail from BMW is part number 83300413582 (thanks to Terra!!)

Make your own with either the 101 sensor or the 058 sensor above and it'll cost less than what BMW charges for this MAP sensor. I left my pigtail quite long for testing purposes but in reality it can be cut down and you'd have a neat plug and play solution that looks better than the BMW replacement in my opinion.

So the 058 sensor that BMW now uses has these specs:

https://farm5.staticflickr.com/4466/...d15987ca_c.jpg

Which is identical to the 101 sensor above that I proposed on using.

https://farm5.staticflickr.com/4481/...34b13fcd_c.jpg

Installed on a CSL and on CSL air rail. I had a really long pigtail on this as I wasn't sure which car I was going to test this on. But this can be made much much shorter and neater of course to make it look completely original

https://farm5.staticflickr.com/4448/...37c74904_c.jpg

In order for this sensor to fit the CSL air rail, all that was needed was 0.5mm shaved off the nose inlet on the sensor with a craft knife (very easy to do) and then I purchased a Viton O-Ring size 8mm ID x 3mm cross section thickness (the original seal that came with the sensor is 8mm ID x 2.5mm cross section which was a little loose for my liking). It was a perfect fit. Everything bolted up like it was made for it.

Testing - identical to the original CSL map sensor readings (sorry the car was still in warm up stage so read a little higher.

No scaling change necessary like the other GM sensor. Same fast responding rate like the original CSL Map sensor.

engine off
https://farm5.staticflickr.com/4453/...ef5a5c9f_c.jpg

Engine on warm up phase
https://farm5.staticflickr.com/4506/...698158f4_c.jpg

Engine on post warm up but low oil temp still
https://farm5.staticflickr.com/4503/...93a0fe87_c.jpg

I took it out for a spin and it was exactly the same as the original sensor - I did a quick log around the block but didn't bother with any screenshots. Everything read as it should.

All together if you were to build this on your own it'd cost much less than the BMW purchased sensor and in my opinion fit much neater and cleaner.

Forgot to add the other good thing about it, the wiring is exactly the same as the original CSL sensor. So pin 1 = pin 1 and so on making the install idiot proof!

Just an update as quite a few people have pm me about the same thing

These part numbers above are BOSCH part numbers not BMW ones.

You can find the plugs on ebay or mouser I believe quite easily. Genuine Bosch is more expensive of course!

The 101 sensor or the 058 sensor can also be found easily on ebay just by searching the sensor part number itself.

This part number is from bmw motorcycle catalogue it is not available from cars parts catalogue.

Hope that helps!

Big thanks for posting.

Out of interest is the original sensor reliable, or is it best to prepare for the worst?

Just want to update this post as I finally got hold of the new BMW supplied MAP sensor from a friend who was updating his conversion.

And dear I say it, this sensor is TERRIBLE ... it doesn't even actually fit - vacuum leak galore. What an after thought. Terribly made and executed.

So as stated before, I shall sue if BMW adopts my sensor as a replacement.

https://farm5.staticflickr.com/4473/...f0f06f57_b.jpg

Thanks for posting this up mate.