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BMW B46 vs B48 Comparison

December 18, 2020 By bmwtuning Leave a Comment

B46 vs B48 – Are They The Same?

This post is going to feel a bit odd to write. We typically like to throw in some technical data and analysis. Nonetheless, there are some minor different between the B46 and B48 engines. Let’s dive in and discuss the BMW B46 vs B48.

B46 vs B48 Emissions

Emissions standards are really the only difference between the B46 and B48. For the consumer there are no important changes between the two engines. The B46 is a SULEV engine, and is the primary engine available in the US. Some other parts of the world also receive the B46. The B48 doesn’t meet the stricter emissions requirements.

It’s basically the same as the N20 vs N26 comparison we wrote about here. Unfortunately, we can’t track down the exact technical data of the B46 vs B48. However, we have a few reasonable assumptions.

What’s Likely Different

This is pure speculation and likely isn’t an exhasutive list. We do know the N20 and N26 make the same power and torque. That also applies to the B46 vs B48. If you’re leaving the car stock then the emissions stuff is pretty irrelevant as there isn’t a noticeable impact to performance. Anyways, we suspect a few differences include:

  • Sorted fuel injectors
  • Stainless steel fuel lines
  • Extra HC fleece filter
  • Minor software changes
  • Catalytic converter

Again, this is speculation and probably isn’t an exhaustive list. Point is – these updates are mostly irrelevant.

The stock B46 and B48 have the same power and torque output. If you’re modding the engines then downpipes, intakes, and software (tunes) are 3 of the best basic bolt-on mods. That addresses the primary differences of the engines that could potentially affect performance when modded.

B46 vs B48 Summary

The BMW B46 and B48 are basically the same engine. B46’s meet SULEV emissions standards and are the primary engines in the US market. We wish we had more technical data to share. However, B48 is the widely accepted engine code for the B46 and B48.

Power and torque from the two BMW engines are identical. The B46 likely has slightly more restrictive parts like catalytic conveters and air-boxes. However, these are among the best starting bolt-on mods regardless of whether it’s a B46 or B48.

Please feel free to drop a comment and share any technical data. Or just throw in any comment – we love to hear from our readers!

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Filed Under: B48

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BMW B48 Content List

Performance & Tuning

300whp B48 for $1,500

B48 BM3 Tuning Guide

Bolt-On Mods

B48 Intake Guide

B48 Downpipe Guide

B48 Charge Pipe Guide

Turbo Upgrades

B48 Upgraded Turbo Guide

Maintenance, Reliability, Engine Problems

Content Coming Soon!

General B48 Content

BMW N20 vs B48

BMW F30 Buyer’s Guide

B48 Stock Turbo Max Boost

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Our garage currently includes a 2008 135i, 2007 335i, and 2008 535i. You can say we are somewhat N54 fanatics. We are hoping to soon add an F80 M3 and F82 M4 GTS.

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