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General E46 Forum
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Old 01-07-2014, 09:55 PM   #21
unevolved
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Quote:
Originally Posted by stefm5 View Post
what i'm saying is that pre cats are important because of the engine's management structure. which is all about emissions. mixture adaptation to keep lamda 14.7:1 constant has nothing to do with performance
I disagree. Controlling your AFR (air-to-fuel ratio, lambda is a single number with 1.0 being perfectly stoichiometric) is very, very important to get the most out of your engine. Whether your goal is emissions or performance doesn't matter. You can't get the most out of an engine if you don't know what's going on.
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Old 01-08-2014, 12:17 AM   #22
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On MS43 equipped cars Pre-cats are needed to control cruise mixture and everything in between outside of WOT.

The steps above turn off the Post cat 02 sensors allowing you to adjust idle mixture for emissions purposes via GT1 while retaining the Pre-cat 02 sensors.

MS45.1 have wideband 02's that also serve to control mixture at WOT. Main reason why those cars pull harder and self tune when mods are made. Whereas MS43 cars need a tune for max performance after certian mods. i.e headers in the WOT (full load) map.
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Old 01-08-2014, 06:22 AM   #23
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That's very interesting. So you're saying WOT is open loop on the MS43?

Also, I asked this question earlier, but didn't get a response. Do you know if the EU2 files posted will work for a 325i?
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Old 01-08-2014, 07:12 AM   #24
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Im doing EU2 tune and have some questions here.
I have removed SAP rellay but from this moment i cant connect to my dme via dis or sss. But then i put it back, everything gets normal. How it can be, it is just a rellay??

2nd qustion. Why we need to disconect EF4? This fuse works only for the heating of all four 02 sensors. Thats why i am getting errors 25 and 55 (heating 1 and 2 bank Pre-cat o2 sensors). I guess all we need to disconnect the both Post-cat sensors, thats all !??
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Old 01-08-2014, 12:46 PM   #25
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Originally Posted by new//M3fan View Post
On MS43 equipped cars Pre-cats are needed to control cruise mixture and everything in between outside of WOT.

The steps above turn off the Post cat 02 sensors allowing you to adjust idle mixture for emissions purposes via GT1 while retaining the Pre-cat 02 sensors.

MS45.1 have wideband 02's that also serve to control mixture at WOT. Main reason why those cars pull harder and self tune when mods are made. Whereas MS43 cars need a tune for max performance after certian mods. i.e headers in the WOT (full load) map.
thanks for making things clear. i still wonder for the choice of screw plugs instead of oxygen sensors for the catless cars.
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Old 01-08-2014, 12:53 PM   #26
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That's very interesting. So you're saying WOT is open loop on the MS43?

Also, I asked this question earlier, but didn't get a response. Do you know if the EU2 files posted will work for a 325i?
as long as your ecu is ms43 yes
software number 7564476
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Old 01-08-2014, 01:16 PM   #27
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as long as your ecu is ms43 yes
software number 7564476
Excellent, thank you.
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Old 02-27-2014, 04:45 PM   #28
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Originally Posted by unevolved View Post
That's very interesting. So you're saying WOT is open loop on the MS43?

Also, I asked this question earlier, but didn't get a response. Do you know if the EU2 files posted will work for a 325i?
That is correct.

You can use bmwfans.info to find the appropriate ZUSB numbers.
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Old 05-11-2014, 01:41 PM   #29
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What ZUSB code would I need for my car? It's a 2001 325xi manual (M54 engine) and I want EU3 emissions. Would it be any of these? The only one with EU3 also says Japan and Automatic...

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Old 05-11-2014, 06:41 PM   #30
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It would be the one ending in 474

Don't forget to clear your adaptations afterwards with the SAP pump and Valve unplugged.
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Old 02-29-2016, 03:04 PM   #31
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Hi, I have e39 with M54 engine, there is no EU3 variant available in realoem, maybe anymore? Only EU2 and EU4. I installed both, dumb data to files, edited and compared data. I can confirm that only difference is MIL light, SAP, cats and secondary lambdas are mandatory in EU4 and in EU2 DISA is not active in idle. I have read about EU2 that it has more torque, more stable idle, go to leaner etc. but I think that none of these is true. DISA can cause to that is go leaner, but in my test that has no effect! I end to install modified EU2 version, where I activated MIL and copy DISA map from EU4. Now all emission systems will work if they are installed, but I can remove any of them, clean adaptation and no MIL! I make also some minor tune adjustments to compensate ethanol gasoline poorer efficiency to prevent it to go lean adaptation (in E95 is 10% ethanol, so it will go 3% lean). I have think also to add more advance, change knock value 2->3 and maybe add injection time in full load to make it little bit more powerful.

Last edited by walopower; 02-29-2016 at 03:15 PM.
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Old 08-04-2016, 07:58 PM   #32
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Quote:
Originally Posted by new//M3fan View Post

EU2

Remove Secondary Air Pump relay.
*Remove fuse #4 (EF4) on the fuse holder inside the DME box.

Fuse Holder

EF4 = 30A, Oxygen sensors and oxygen sensor heater circuits

Final Step

After finishing the steps above go into INPA or GT1 and clear your adaptations ; that's it!

EU2 - Special Notes

Now through GT1 you will be able to access the test function "set idle mixture"
This will also tell you if the DME is in true EU2 mode as it typically throws an error if ran on the other variants.

----------------------------------------

State Inspection OBDII Reports

EU2 - SAP monitor N/A (not applicable) 02 sensors (? not yet tested) EOBD not on. FAIL

EU2 - the EU2 software will require the EOBD ( engine light on key on ) to be manually coded into the DME via tuning methods for it to pass)) that is depending on how the 02 sensor heaters show up i.e N/A will pass, not ready will not.

Flash file with EU2 EOBD turned on
http://forum.e46fanatics.com/showthr...0#post15766530

The reason EU2 works flawlessly on cars with cats is because it's running a hybrid setup
Which app do you to flash the EU2 EOBD turned on? Which file is it exactly?
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