N52/N51 FAQ
What is the link to the N52 Facebook group?
(Make sure to answer all of the questions, or the FB bot will auto-decline the join request)
What is the link for the Aliexpress headers?
If the link expires, look for a new listing with this photo by searching "328i headers" or "N52 headers". They frequently go out of stock. Be sure to order the ones with the o2 sensor bungs located after the merge, and use OEM gaskets linked below.
Always specify to the seller that you need the USA version and not the EURO version, regardless of the cars origin. You can use the photos below to confirm. The Euro version has fitment issues, incorrect head flange, and incorrect oxygen sensor placement.
USA version
We are not affiliated with the AliExpress seller. We cannot help with this product's availability or ordering. Always use PayPal for protection when buying from AliExpress.
What about headers for RHD?
We have seen lots of positive reviews for Gravity Performance Headers. We are not affiliated with this company.
Which 22RPD tune should I use?
For N51 and N52- Stage 1,2, and supercharger tunes have been consolidated into a single page linked below-
Should I upgrade my injectors or fuel pump?
You do not need to upgrade your injectors or fuel pump unless you are running E85 or boost.
E85 requires the following injectors plus the 22RPD Stage 2 tune
Boost will also require these injectors, and possibly a fuel pump past 400+ whp.
How do I install a catch can on my N52?
https://www.youtube.com/watch?v=lod-ZpPX6iU
(Use 3/4" hose, do NOT drop down in size or tee into evap hose like the video above, it does not flow enough.)
How do I make my N52 sound good?
Without headers:
135i N54 muffler + Resonator delete
With headers:
3" Exhaust merged at the transmission mount
How do I install a WOTBOX on my N52?
https://www.e90post.com/forums/attachment.php?attachmentid=1668680&d=1501783979
Common misfire/rough idle causes on N52/N51
-Broken CCV hose
-Ignition coils
-Spark plugs
-Vacuum leak
-Leaking valve cover gasket
How do I smoke test my N52?
https://www.youtube.com/watch?app=desktop&v=Xc0Owfkztbw
How do I install an N54 intake manifold? Is it plug and play?
OEM+ method-
Guide- https://www.e90post.com/forums/showthread.php?t=1902505
Hardware Kit(Coupon code- Raimund for 10% off)
Eccentric inserts(Coupon code- Raimund for 10% off)
(Thanks to Alphonse/Biginboca for the guide)
Easy method-
- Eccentric inserts (Coupon code- Raimund for 10% off)
- Catch can to delete CCV- https://amzn.to/3W1kPi6
- Catch can hoses included will not work, buy only 3/4" FUEL RATED hose and cut to fit.
- 3/4" hose must be used with no reduction in size. Doing so can cause excessive crankcase pressure and damage.
- Buy a used N54im throttle body to attach the fuel evap hose to as it has a port for it.
- 2006 models will require soldering an 07+ throttle body connector to run an n54 throttle body.
You will need a tune for the n54im intake manifold to run correctly and make good power.
Tune here- 22RPD N51 N52 Tune
What oil should I run in my N52?
Both Liqui-Moly High Tech 5W-40 and Rotella T6 5W-40 has tested well in my Blackstone oil analysis. I run 0W-40 below freezing.
What spark plugs and ignition coils should I run in my N52?
Eldor N54 Ignition coils (Some 2005 build dates will require snipping an alignment pin off)
I just bought an N52, what tools should I buy?
Bimmergeeks Protool + Android device + Bluetooth adapter
Ratchet set (More teeth = worth the $)
Do I have the 3 Stage Intake Manifold?
If you have the DISA valve shown in the circled photo below, you have the 3 stage intake manifold. (There is a second DISA on the lower inner portion under the runners.
Valve cover job trick-
Should I use a 3 stage intake manifold or n54 intake manifold?
- With a redline of 7500, at WOT you'll always be in the n54im's peak powerband which outperforms the 3si.
- N54im has no disa failure points which can kill an engine.
- N54im has a more linear powerband.
- 3si has more low end torque
- Weight reduction
- 3.73 or 3.91 rear differential (Both front and rear 3.91 diff if AWD)
- Straight through muffler
- XHP Stage 3 transmission flash for ZF6 auto trans. (Only 06 325/330 and 528i)
12 comments
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I have a e90 n51 and I’m planning on installing some headers with exhaust. But where I’m from emissions is a pain, will car less headers stop me from passing emissions or no?
Hello everyone, I have a 2007 328 with around 230k on both motor and trans, and I’m have some concerns on my transmission. Sometimes on take off I will get a lunge on 1-2 and sometimes 2-3. The fluid was supposedly changed by the previous owner 10k ish miles ago on the car, Mainly thinking the solenoids might be going out and this is the sign for it but not 100% sure. Had anyone had a similar problem and had a idea on the solution?