We wouldn’t call this a ‘common problem’ so much as maintenance must-dos. Gaskets/Front Main Seal/Rear Main Seal/Clutch You’ll need feeler gauges and shims for this job, much like the old racing engines from the DTM glory days. Our Valve Adjustment Kit has everything you need. It is recommended that a valve adjustment is performed roughly every 60k miles to prevent any valves from falling outside of their operational tolerance. A ‘drawback’ of the high-revving engine is that the lifters were designed similarly to older racing engines that use shims to set engagement points with the valves for correct operation. While most modern cars, or even cars of the same era as the E46, don’t require this kind of service, the S54 is a different breed. Stay ahead of this catastrophe with our BMW E46 M3 Dual VANOS service kit and VAC camshaft hubs. In simple terms, tabs on the camshaft hubs have a tendency to break off and find themselves in the timing chain, which can spell disaster for your engine. It is important to perform the VANOS service if you suspect your VANOS is failing, but it is also critical that you ensure the VAC updated VANOS camshaft hubs are included in that service. VANOS units are a known issue for all BMWs of this era, but the S54 has a unique twist. VANOS, or basically BMW Vtech, is the variable valve timing system BMW uses to adjust cam and valve timing across the RPM range. If the service happened at 50k miles, and your potential car has 90k miles, you’ll still need to do those rod bearings in roughly 60k miles. It is definitely something you need to look for if you are purchasing an E46 M3, but note the mileage. While they may last longer than the 100k mile interval outlined by BMW’s technical service bulletin update, a 100k mile service is imperative to keep your S54 happy and healthy. Even the best options, like our WPC Treated Rod Bearing Service Kit, for your E46 M3 isn’t a lifetime part. The rod bearing service, while critical, isn’t a permanent solution. That’s the part most owners and enthusiasts tend to forget. Unfortunately, the solution is effectively 100k mile rod bearing service. In short, BMW did not spec the rod bearing sizes correctly, which causes premature wear and eventual failure. If you are looking for an E46 M3, you’ve probably heard about the rod bearing issue. This article will help you understand what you might expect as a new E46 M3 owner or if your M3 is climbing to higher mileage as you enjoy it and what E46 parts you need to keep it reliable. Fortunately, those issues are well documented by now and the solutions are readily available, but they are issues all the same. Despite all those positives, and the 333bhp S54 power plant under the hood, they do suffer from some common issues. With a celebrated history, massive enthusiast community, and astounding aftermarket support, it has maintained relevance and still commands a premium price, even for SMG-equipped examples.
#E46 m3 differential upgrade upgrade#
Lastly, there are some upgrade options that may be selected including ring and pinion polishing for reduced friction / lower temperatures, upgraded rear covers, as well as miscellaneous bolts and fluids.The E46 M3 is considered the last analog M3 and is still used today as the benchmark quintessential sports car. Take a look at our RPM / MPH chart in Technical Information to see how various ratio's may affect your cars performance. The higher the gear ratio, the more RPM's an engine must turn to keep your speed constant. The gear ratio determines the number of revolutions of the wheel for every revolution of the drive shaft. The first decision to make when buying a custom differential is to determine the gearing you want. We start by cleaning the differential housing, then select the industry's finest ring and pinion gears, apply the desired clutch packs and options, and finally carefully assemble the housing to be shipped to your door. To get the most performance on the track, we would recommend changing the gear ratio to 4.10 for the 6 speed cars and 3.85 for SMG option.ĭiffsonline builds a wide variety of BMW differentials in house to accommodate the several different differential housings used in modern BMW's.
We have found that using a 3 clutch limited slip with either the 35/60 or 30/90 ramp angles for a much longer life span and better all around performance. We can refresh the M variable limited slip for a stock rebuild. The E46 M3 came with the M Variable limited slip that is known for a relatively short life span (right around 80k miles).
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