Educate me on Carbon Airbox tunes

[Grke46m3]

I drive my m3 about 1k miles a year at this point. Same altitude. Would it be even worth it to get a map setup or just get a good alpha N tune.


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[Notan_S54]

I drive my m3 about 1k miles a year at this point. Same altitude. Would it be even worth it to get a map setup or just get a good alpha N tune.


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Hey, not sure if this input helps your question but my M3 was in the same boat. Driving around 2k miles a year and at the same altitude (sea level) and I had an alpha N tune that did well for me for the most part other than a hard throttle hesitation in first and second gear at low rpm.

[bigjae46]

A dumb question here...

I'm going alpha-N so getting prepared. For one, I need to install a SPAL fan to keep the engine from melting down on the dyno

But...for the IAT sensor...I have an aftermarket sensor that feeds a gauge in the car. Its a 2 wire 1/4" NPT brass sensor...can I use that to wire into the OE wiring? Or must I stick with an OE sensor?

Next dumb question...what's the best way to install an OE sensor if I have to use one? I have an aluminum intake so I can weld a bung if needed. Already have a 1/4" NPT and 1/8" NPT bung welded into the tube.

[Slideways]

A dumb question here...

I'm going alpha-N so getting prepared. For one, I need to install a SPAL fan to keep the engine from melting down on the dyno

But...for the IAT sensor...I have an aftermarket sensor that feeds a gauge in the car. Its a 2 wire 1/4" NPT brass sensor...can I use that to wire into the OE wiring? Or must I stick with an OE sensor?

Next dumb question...what's the best way to install an OE sensor if I have to use one? I have an aluminum intake so I can weld a bung if needed. Already have a 1/4" NPT and 1/8" NPT bung welded into the tube.

If you want to use your existing sensor, you will have to change the scaling in the tune to work with that sensor. Two of the common IAT sensors are the CSL sensor and the BERU E34 IAT sensor. They both use two wires as well. The E34 sensor is probably the easier one to use for your application because it is a threaded sensor. To use the CSL sensor, you have to buy the port that fits that sensor and attach it to your intake - the part number is in a BMW motorcycle parts catalog.

[01 Carbonragtop]

Question for the CSL intake crowd. I want the easiest CSL intake setup so that I can uninstall and reinstall the box every two years. This is due to CA smog reasons. Would that just be to get the CSL intake and the get an OTS alpha N tune? I also currently have a dinan stage 1 tune on my car and bought it that way. Would that be considered my base tune when flashing the new alpha N tune?

Interesting, this is some cool stuff

[Deen HK]

Question for the CSL intake crowd. I want the easiest CSL intake setup so that I can uninstall and reinstall the box every two years. This is due to CA smog reasons. Would that just be to get the CSL intake and the get an OTS alpha N tune? I also currently have a dinan stage 1 tune on my car and bought it that way. Would that be considered my base tune when flashing the new alpha N tune?

I had an OTS alpha n tune from active autowerkes and it was terrible. Hesitation through out the rev range and car felt severely underpowered for having no cats and a carbon airbox. Got an HTE dyno tune (still alpha n), and we found the car was running extremely lean. Dumped a bunch of fuel into it and got some other things cleaned up. It was a night and day difference, I definitely recommend a real dyno tune with AFR readings versus a simple OTS tune.

Yes the current tune on it now would essentially be your base tune

[4getr34]

Will I need a tune if my car is stock and have a MSS54HP DME with MAP conversion?

also for MAP convesion, there appears to be two kits:

https://www.ebay.com/itm/265984112446

https://www.kasselperformance.com/product/bmw-e46-m3-s54-csl-map-sensor-conversion-kit

anyone have experience can talk about either?

[SurgeSi]

does anyone have a part number for the CSL DME?

[SurgeSi]

or what DME I should be looking for.

[tnord]

I have the Kassel MAP kit. My car is a 2003.5, but it's an early one in the cycle and unexpectedly didn't have the HP DME. Since Kassel already had it they did the HP conversion and put their tune on it at the same time. I generally haven't had too many issues, though I'm lacking throttle response on downshifts around 3k RPM. I haven't definitively figured out what is causing it.

[zzyzx85]

or what DME I should be looking for.

Bosch MSS54HP

[Slideways]

Bosch MSS54HP

So close, Siemens

[zzyzx85]

So close, Siemens

ah damn. wrong German electronics manufacturer 😄