Previously, we wrote a post about modding BMW N63 engines to make 500+whp on stock turbos. These are already impressive results. However, that’s simply not enough power for some N63 owners. That’s where N63 and N63tu upgraded turbos come into play. Although, upgrading N63 twin turbos does come with additional risks. In this guide, we’ll examine several upgraded twin turbo options along with the potential power and risks of each.
If you are looking for additional information about the BMW N63 engine including specs, common problems, and best performance mods, take a look at our dedicated BMW N63 Engine Page.
**BMW N63 Pure Stage 1 turbos pictured above
BMW N63 vs N63tu Upgraded Turbos
The turbos referenced in this guide will fit both the N63 and N63tu models. However, it’s important to note a few significant differences with the engines. We wrote an in depth post about the differences between the N63 and N63tu here. The main difference we want to focus on lies within the internals. The N63tu engine receives a forged crank and rods. Additionally, the N63tu features oil spray nozzles to help cool the piston crowns.
These differences make the N63tu a stronger engine overall. With proper supporting mods and tuning, the N63 and N63tu are capable of making similar power numbers. Though, the N63tu is better suited to handling higher horsepower. However, both engines have their limits. That leads us to our next paragraph. However, one more quick difference before we move on.
The N63 recently received flash tuning capabilities. Flash tunes are highly recommended to fully utilize upgraded twin turbos. As far as we are aware, N63’s must actually send in their DME’s for flash tuning. The N63tu is a much easier engine to flash tune. Bootmod3 N63 tunes are a great starting point, but you’ll need a custom flash to fully utilize the turbos.
N63 and N63tu Horsepower Limits
It’s tough to put upper limits on any engine. This is especially true with the N63 and N63tu where not many are pushed to 600-700+whp. Additionally, torque plays a bigger role in an engine’s upper limits when compared to horsepower. Keep in mind – the more power and torque you push, the more risk you are taking on a stock engine. In general, we believe the “safe” upper limits of the N63 and N63tu are as follows:
- N63 – 600wtq
- N63tu – 650wtq
There is, of course, still risk at these levels. Ultimately, it’s important to ensure you’re running a proper tune, fueling, and supporting mods. If you’re targeting 600+whp we highly recommend running meth, race gas, E85 mixtures, or a combination of those. Additionally, you may consider tuning to limit torque on the lower-end and mid-range unless you’re building your engine. You can still make big power by shifting the curve right. We won’t go any further into that in this post.
However, if you’re looking for more info check out our S55 upgraded twin turbo guide. If you scroll down a little bit you’ll see a section titled “S55 Top-End Power” followed by two dyno charts. The same basic concept applies to the N63 and N63tu, as well.
BMW N63 Upgraded Twin Turbo Options
Alright, it’s almost time to dive into the more exciting part. However, one more quick topic to discuss prior. We highly recommend opting for 1-step colder spark plugs (NGK 97506) for upgraded turbo N63’s. Additionally, you may consider replacing your ignition coils if that hasn’t been done in the past 50,000+ miles.
Depending on your power goals you may be able to get away with OEM N63 spark plugs. However, 1-step colder plugs assist in transferring more heat away from the spark plug tips. Many modded N54, N55, S55, N63, etc engines run the NGK 97506 plugs with great success. Anyways, let’s move on to the exciting stuff.
**Generally, we prefer to find multiple dynos and different cars running each set of turbos. However, information for N63’s and N63tu’s running upgraded turbos is limited. As such, some of the horsepower numbers we use below are estimates and/or are taken from the manufacturers recommendations. Additionally, the power numbers assume you have proper tuning, fueling, and supporting mods.
1. N63 Pure Stage 1 Turbo Upgrade (600-700whp)
Pure Turbo builds some awesome turbos not only for the N63, but also many other modern BMW engines. Many run these turbos with excellent results. They’re without a doubt one of the most popular turbo upgrade options for all modern, turbo BMW engines. It’s hard to argue with the quality, price, and results of these turbos.
There are multiple N63’s making over 600whp on pump gas and meth injection only. One managed and impressive 640whp and 680wtq with a JB4 on 91 octane and meth injection. Impressive numbers, but keep in mind that torque is likely pushing the upper limits of the N63 and N63tu. Another made 655whp and 582wtq on a flash tune with race gas and meth. This was also on a Mustang dyno so the actual power may be closer to 700whp on a dynojet. We reference this example because it’s a great ballpark to target with an unopened N63 engine. Peak power is impressive, however the torque of 582wtq indicates the owner likely tuned out a bit of torque in the mid-range. It’s a good way to play things a bit safer with a stock engine.
Overall, Pure Stage 1 turbos are an excellent option for the N63 and N63tu. These turbos are certainly capable of pushing the upper limits of the N63 engine. With proven results and a good price point it’s tough to go wrong.
2. N63 Vargas Turbo Tech Stage 1 Turbo Upgrade (650-750whp)
Vargas Turbo Technologies (VTT) is yet another popular option for many modern BMW engines. Based on their website, it appears they claim these turbos are good for up to 800whp. However, we weren’t able to find any examples of N63’s running these turbos. They’re a similar option to the Pure Stage 1 turbos mentioned above, so we suspect they’re also good for at least 700whp.
Again, as with Pure Turbos, the VTT stage 1 turbo upgrade is likely enough to push the upper limits of the N63 engine. This is a common theme for most aftermarket N63 turbo options.
3. N63Intake Stage 2 Turbo Upgrade (550-650whp)
We’re slightly guessing on the horsepower quoted above. There really isn’t much information about these upgraded stage 2 N63 turbos from N63intake.com. They show a few dynos on their site of the turbos making 580+whp and 600+wtq. However, that’s about all of the information we could find. It would be nice if we had some additional information such as fueling and supporting mods.
Again, the power numbers above are an estimate but we suspect with proper tuning and fueling these turbos are good for at least 600whp. Unfortunately, without additional info there isn’t much more to say. However, N63intake.com does make some popular products for N63 engines. We were unsure whether or not to include these turbos in our guide. However, there aren’t too many options out there so we ultimately decided to throw them in.
4. N63 Pure Stage 2 Turbo Upgrade (700-750+whp)
Moving onto yet another N63 upgraded twin turbo option that doesn’t have much data out there. They do provide the above dyno on their site, which is tough to see perfectly. However, it appears the run in black managed to eclipse 750whp and 750wtq. Definitely impressive results but we wish we knew more about the car, fueling, and supporting mods.
These turbos can push the N63 well past it’s safe upper limits. It doesn’t appear many N63 owners are building their engines to handle bigger power. That likely plays a role in these turbos not being as popular as the above Pure stage 1 option. Nonetheless, if you’re interested in exploring the limits of the N63 the Pure stage 2 turbos will definitely get you there. It’s definitely going to take a lot of supporting mods and proper fueling to support 700+whp. Additionally, that’s beginning to push well outside the limits of the factory automatic transmission.
N63 Upgraded Twin Turbo Summary
The N63 and N63tu are capable engines straight from the factory. BMW’s N63 has shown to make 500+whp on stock turbos while the N63tu has eclipsed 550whp. However, if those numbers don’t satisfy your goals then N63 upgraded twin turbos are the way to go. Unfortunately, it doesn’t seem many are really pushing the limits of this platform. As such, data and information on turbo upgrades is rather limited.
Pure stage 1 turbos seem to be the most popular option for N63 twin turbo upgrades. There are multiple examples being pushed north of 600whp, which are certainly impressive results. A few other options VTT, N63intake.com, and Pure’s stage 2 turbo upgrade. Keep in mind – all of these N63 upgraded twin turbos are capable of pushing the engine towards its upper limits. We recommend limiting torque below 600-650wtq and allowing the turbos to make their biggest results towards the top-end. Additionally, proper fueling such as race gas or E85 and meth injection are recommended. Nonetheless, if you’re looking to push your N63 or N63tu to the next level – look no further than upgraded twin turbos.
* We appreciate any feedback. Please feel free to drop a comment if you have any questions or think we missed something