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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20 and N26 Turbo Engine / Drivetrain / Exhaust Modifications > Late production change to the N20?
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      02-07-2013, 09:02 PM   #1
Jamesons Viggen
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Late production change to the N20?

So I went to install my BMS stage 1 today.

I know it works on both N20 and N26.

From what I had read, at first all manuals were N20's. Then I read that later on in production N26's were replacing N20's, and so some people were seeing N26/6mts.

I was told the way to spot an N26 was the electric boost solenoid on top of the turbo.

So I got to do the install and the first sensor I am supposed to tap is not there. I take a few pics, figure I would send them to BMS. I looked at the pics and thought man, that is what the N26 solenoid is supposed to look like. WTF, do I have an N26?

Sure enough, Terry confirmed.

I either have an N26, or in my later production run of 7/12, they began using the N26 electronic solenoid on the N20.

When I looked up my VIN, it clearly states N20.

For those who don't know what to look for, see this pic, this is what your turbo will look like if you have the solenoid. If your VIN comes up N26, that's to be expected, but if you have an N20, then it might be interesting to share your build date.
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      02-08-2013, 03:10 AM   #2
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So did you end up installing the tune with all the connectors? Because mine doesn't work and i have not the time to contact BMS yet and I suspect mine is the same as yours. 7/2012 production.
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      02-08-2013, 09:57 AM   #3
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So did you end up installing the tune with all the connectors? Because mine doesn't work and i have not the time to contact BMS yet and I suspect mine is the same as yours. 7/2012 production.
Yeah, went in fine. All the other connectors are where they should be, it's just the first one you leave unplugged. Terry replied to my email in less than five minutes. Taking pictures helped.
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      02-08-2013, 10:57 AM   #4
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Mine was the same way, I have the N20 motor with electronic boost solenoid. My BMS works great!
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      02-08-2013, 11:42 AM   #5
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Will either of you guys test your cars on a dyno to see what the gains are?
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      02-08-2013, 12:28 PM   #6
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Will either of you guys test your cars on a dyno to see what the gains are?
Yep, I will redyno when the new exhaust is put on. There are some other dynos posted and they so far all support BMS's claims.
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      02-08-2013, 04:01 PM   #7
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Same here, believe they went to electronic wastegate on the N20 late in the summer.
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      02-08-2013, 07:18 PM   #8
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Quote:
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Yep, I will redyno when the new exhaust is put on.....
Cool. Looking forward to that!
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      02-10-2013, 09:36 AM   #9
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Any remaining differences?

Quote:
Originally Posted by Turbo00 View Post
Same here, believe they went to electronic wastegate on the N20 late in the summer.
If this is correct, what differences are there between N20 and N26? I thought that the wastegate was "it."
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      02-10-2013, 01:14 PM   #10
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Quote:
Originally Posted by Jamesons Viggen View Post
So I went to install my BMS stage 1 today.

I know it works on both N20 and N26.

From what I had read, at first all manuals were N20's. Then I read that later on in production N26's were replacing N20's, and so some people were seeing N26/6mts.

I was told the way to spot an N26 was the electric boost solenoid on top of the turbo.

So I got to do the install and the first sensor I am supposed to tap is not there. I take a few pics, figure I would send them to BMS. I looked at the pics and thought man, that is what the N26 solenoid is supposed to look like. WTF, do I have an N26?

Sure enough, Terry confirmed.

I either have an N26, or in my later production run of 7/12, they began using the N26 electronic solenoid on the N20.

When I looked up my VIN, it clearly states N20.

For those who don't know what to look for, see this pic, this is what your turbo will look like if you have the solenoid. If your VIN comes up N26, that's to be expected, but if you have an N20, then it might be interesting to share your build date.
So I just checked my car and I found the same thing! My vin says n20 I ordered at late 6/12 so I guess it would be the around the same production time as yours(7/12).
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      02-27-2013, 12:35 AM   #11
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Are we losing out on some of the tunes claimed gains if we dont have this connection?
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      02-27-2013, 10:58 AM   #12
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Are we losing out on some of the tunes claimed gains if we dont have this connection?
Nope.

They posted a dyno on an N26 and the numbers were as good if not better than the early N20 dyno.
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      02-27-2013, 01:33 PM   #13
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Quote:
Originally Posted by Jamesons Viggen View Post
Nope.

They posted a dyno on an N26 and the numbers were as good if not better than the early N20 dyno.
Oh ok cool
i just got my BMS tune yesterday
Dont know if anyone with xdrive has gotten it yet and posted up dyno numbers yet.
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      03-02-2013, 05:54 PM   #14
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Where in the VIN does it say which engine I have?
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      03-02-2013, 05:58 PM   #15
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Where in the VIN does it say which engine I have?
Put the last 7 digits of your vin into bmwvin.com
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      04-04-2013, 06:26 PM   #16
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Hey Jamesons Viggen what exhaust are you going with?
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      04-04-2013, 07:33 PM   #17
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Hey Jamesons Viggen what exhaust are you going with?
Rogue Engineering, but it's going to be another couple months.
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      04-05-2013, 12:53 PM   #18
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is it cat back or axle back?
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      04-05-2013, 01:01 PM   #19
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is it cat back or axle back?
Cat back. Will be under $1000, 15-20% lighter than stock and has a standard option to bypass the muffler or add an electric bypass for extra $$$.
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