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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > n53 or n55/n20 ignition coils on n52?



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      10-23-2012, 04:01 PM   #1
andrey_gta
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n53 or n55/n20 ignition coils on n52?

Noticed that the Direct injected n53 motor has different ignition coils.
Their shape looks to be the same, but n53 seems to have a bump near the bottom. If that bump is removed, it would fit n52.
  • n53/n42 uses a Bosch coil Part#: 12137594935
  • n55/n20 uses a Delphi coil Part#: 12137594596
  • n52 uses a Bosch ignition coil as n54, n63 part number 12137594937

Logic:
  • The Okada project coils are expensive and give a better spark: http://www.okadaprojects.com/usa/home.htm
  • Some race teams ran Okada
  • n52 guys in asia reported some effect
  • the BMW parts are cheaper then Okada parts.


Does it make sense to try this mod??
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      10-23-2012, 04:21 PM   #2
fravel
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But why? What are you hoping to gain?
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      10-23-2012, 04:35 PM   #3
andrey_gta
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just to avoid the cost of Okada products.

the gains are small ( better fuel econ & a bit HP/tq gain)
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128i Sport 6MT converted to Euro 130i spec, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: e36M lip Wishlist: //M front arm, coils, n55 eng mnt, headers, LSD, e60 finn diff


"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
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      10-23-2012, 05:19 PM   #4
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[quote=andrey_gta;12882902]just to avoid the cost of Okada products.

the gains are small ( better fuel econ & a bit HP/tq gain)[/QUOTE]

I doubt that.

Don't think it's really worth the hassle.
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