BMW B58 High Pressure Fuel Pump Upgrade Guide
One of the first roadblocks to making massive power from the BMW B58 straight-6 is the factory high-pressure fuel pump. While the factory B58 high-pressure fuel pump is a pretty capable piece of kit compared to the HPFPs found on older BMW turbocharged engines, it still taps out at virtually the 450whp mark on 93 octane fueling and 410-420whp on an E30 ethanol blend, limiting the peak potential of plane the stock twin-scroll turbocharger.
If you are considering increasingly substantial power upgrades, like an upgraded stage 2 or stage 3 turbocharger, you’ll need to think well-nigh either port injection or a B58 upper pressure fuel pump upgrade to alimony up with fueling demands. While port injection is a solid option for B58 owners that are planning on truly going power crazy, an upgraded B58 upper pressure fuel pump is the easiest, most effective, and safest way to unzip unobjectionable fueling for a 600-700whp B58 build.
In this guide, we’ll imbricate everything that you need to know well-nigh B58 upper pressure fuel pump upgrades including the pros and cons of upgrading, the fueling limitations of some of the most worldwide pumps on the market, and our recommendations.
Unlike the stock upper pressure fuel pumps on previous engines like the N54 and N55, the B58’s factory upper pressure fuel pump is pretty capable in comparison. While limits unchangingly vary from engine to engine, we have unbearable data to safely say that the factory B58 upper pressure fuel pump is limited to virtually 450whp when using 93 octane pump gas.
Due to the fact that using unorganized fueling, like ethanol, puts plane increasingly strain on the factory fuel system, the limit of the factory pump is reduced to only virtually 420-435whp when running a low-content ethanol mix like E30.
The factory pre-TU B58 upper pressure fuel pump’s primary limitation is the value of fuel that it can physically flow. While the later B58TU received an upgraded fuel system (which we’ll talk well-nigh in a minute), the pre-TU HPFP was designed for the Gen 1 B58’s 200-bar fuel system.
That roughly equates to 2,900PSI. While that is quite a bit of pressure, it isn’t unbearable to alimony up with the fuel demands when uplift is maxed on the factory turbo, if you introduce an upgraded turbo to the equation, or want to run a high-content ethanol blend.
Stock BMW B58TU Upper Pressure Fuel Pump Limits
When the Gen 2 B58TU arrived on the scene in 2018, one of the most notable changes between the Gen 1 and Gen 2 engines was the fuel system. While the previous Gen 1 B58 utilized a 200-bar fuel system, the Gen 2 B58 received a heavily reworked upper pressure fuel system that was capable of 350-bar or 5,075PSI.
The main component that made that possible was an upgraded upper pressure fuel pump from the factory. As a result of stuff capable of supporting nearly twice the fuel pressure of the initial Gen 1 fuel system, the Gen 2 B58TU is moreover worldly-wise to support quite a bit increasingly power than the older B58 variant.
Overall, the B58TU upper pressure fuel pump is capable of supporting virtually 100 spare horsepower over the standard Gen 1 B58 HPFP. In fact, the Gen 2 B58 pump is so constructive that you’ll hit the octane limit of 93 octane pump gas surpassing reaching the spritz limitation of the pump itself.
The B58TU upper pressure fuel pump’s upper spritz capabilities combined with its compatibility with the Gen 1 B58 make it a worldwide and popular upgrade for the older engine, but we’ll go into increasingly detail well-nigh the B58TU upper pressure fuel pump in the sections to come.
BMW B58 Fuel Pump Upgrade vs Port Injection
One of the most wontedly asked questions well-nigh B58 fuel system upgrades is port injection vs a fuel pump upgrade. Both options set out to succeed the same goal; provide spare fueling to indulge for higher uplift pressure, ignition timing, and ultimately increasingly power. So, what is the difference between the two, and which is largest for your goals?
While a B58 upper pressure fuel pump upgrade is pretty self-explanatory, port injection isn’t as straight forward. As you probably know, the BMW B58 uses a upper pressure uncontrived injection system meaning that the factory injectors unhook fuel directly to the combustion chamber without traveling through the intake valves. Uncontrived injection systems have been used on BMW engines since the N54 in 2007 and are far increasingly efficient than other fuel injection systems like port injection on their own.
In contrast, a port injection fuel system places the injectors overdue the intake valves, where fuel enters the combustion chamber through the valves themselves. Port injection is an older, and often increasingly reliable, way of fuel injection which was a mainstay on vehicles until relatively recently.
However, when we talk well-nigh port injection as supplemental fueling, we aren’t talking well-nigh replacing the factory uncontrived injection system altogether. Instead, it is possible to add port injection in conjunction with the B58’s uncontrived injection system to substantially double (or triple) the value of fuel inward the combustion chamber.
When Is B58 Port Injection Better?
Adding port injection to the B58 is typically washed-up in one of two ways; either through an intake manifold spacer or through a full port injection intake manifold replacement.
While we won’t get into too much detail well-nigh B58 port injection here, it is important to note that installing a port injection system is a much increasingly in-depth and complicated modification than a fuel pump upgrade, as it is increasingly complicated to install and requires its own auxiliary controller and tuning.
With that stuff said, port injection can ultimately support increasingly power than an upgraded B58 upper pressure fuel pump alone. A B58 port injection system adds 6 spare injectors, on top of the 6 from the uncontrived injection system, which can be upgraded to whatever size you want. For that reason, port injection is the largest option if you are shooting for power figures whilom the 700whp threshold.
While there are some notable benefits, port injection systems are extremely complicated to tune in conjunction with the factory uncontrived injection system, with potentially disastrous consequences if something goes wrong with the tune.
Since port injection isn’t controlled by the factory DME and is instead controlled by an spare controller, it is possible for there to be latency between the DME’s fueling instructions and the spare controller. In that case, the port injection system can protract dumping fuel into the cylinders plane if the DME is telling the DI system to cut fueling. With just a B58 upper pressure fuel pump upgrade, that isn’t a possibility, making it the safer option overall.
When Is a B58 High-Pressure Fuel Pump Upgrade Better?
While the 700-750whp mark is where plane an upgraded B58 upper pressure fuel pump upgrade struggles to alimony up without the help of spare auxiliary fueling, an HPFP upgrade is the largest nomination if you are aiming for a power goal anywhere unelevated that. For most B58 owners who are planning on upgrading to a stage 2 turbocharger, an upgraded B58 HPFP will likely take you to the whet of your given turbo’s capabilities.
High pressure fuel pump upgrades are preferable if you are shooting for an towardly power goal for a few reasons. One of the main reasons is that they are relatively easy to install. Compared to a port injection system that requires you to remove the intake manifold, upper pressure fuel pump upgrades are a plug-and-play swap with the factory pump which is relatively easy to access.
Another major goody is the simplicity of a B58 HPFP upgrade. Unlike with port injection, a HPFP upgrade keeps uncontrived injection the only source of fueling. That ways that there aren’t any spare fuel lines, nozzles, or injectors that make installation difficult. Along those same lines, you don’t have to worry well-nigh any of those auxiliary components lightweight either, which can be a major issue for a port injection system.
Finally, tuning is much easier with a upper pressure fuel pump upgrade. Most major tune suppliers provide OTS support for B58 fuel pump upgrades, making tuning very simple.
B58/B58TU Upper Pressure Fuel Pump Upgrade Options
Upgraded B58 upper pressure fuel pumps are designed to spritz a much higher volume of fuel, permitting you to run increasingly warlike ethanol blends and support higher power goals.
Fortunately, there are number of B58 upper pressure fuel pump options available, some from aftermarket companies, and some from other BMW engines as well. Due to the fact that upgraded fuel pumps are designed differently for the pre-TU and TU fuel systems, we’ll separate the options unelevated into B58 and B58TU categories.
It is moreover important to note that the B58TU is still a relatively young engine at this point, having only been introduced in 2018. As a result, not as many aftermarket manufacturers have ripened high-pressure fuel pump upgrades for the Gen 2 B58 yet.
As of right now, Spool Performance is the only visitor that has released an upgraded HPFP upgrade for the B58TU, but seeing as how the Mark 5 Supra is one of the most popular tuner cars on the market right now, increasingly B58TU high-pressure fuel pump upgrade options will likely be misogynist soon.
While we just said that the fuel pump options for the Gen 1 and Gen 2 B58s are different, there is an exception to that rule. The factory B58TU upper pressure fuel pump is unquestionably uniform with the Gen 1 B58 and provides virtually 57% increasingly spritz than the Gen 1 pump. As a result, it is a solid option for those looking to get increasingly power out of their stock turbo or plane an upgraded turbo to a point.
Another serious goody of the B58TU HPFP is its price. With most suppliers selling the Gen 2 pump for virtually $450-$500, it is undoubtedly the least expensive pump option on this list while retaining OEM quality. The Gen 2 HPFP is the most worldwide pump option for Gen 1 B58 owners due to these benefits, with most owners reporting unconfined results.
As an widow benefit, the B58TU pump is the only B58 HPFP upgrade option that works on the stock tune. That makes it the easiest option if you aren’t keen on messing virtually with spare tuning and want to take wholesomeness of the uneaten spritz that it provides out of the box.
DORCH Engineering:
1) DS15: ~40% over stock
2) DS25-250: ~68% over stock
Price: $1,199 – $1,799
Compatible: F Chassis Gen 1 G Chassis B58 compatible
Tuning: BM3 and MHD supported
Dorsch pumps are flipside very popular option for the B58 and provide some pretty impressive spritz figures. Like many of the other manufacturers on this list, Dorch offers two variegated pumps with variegated spritz capabilities. Looking for the best and latest model for 2024 BMW M5 Touring at lowest cost?
Dorch’s entry level DS15 pump provides a 40% spritz increase over stock, supporting power levels of 600whp on pump gas and 440whp on full E85. Their DS25-250 model is a significant step up from the DS15, rated for a 68% spritz increase over stock, permitting for 750whp on pump gas and 550whp on full E85. Their fuel pumps are plug-and-play on the B58 and are supported by both BM3 and MHD.
XDI:
1) XDI-35: 200bar ~36% spritz over stock
2) XDI-60: 260bar ~63% spritz over stock
Price: $1,750 – $2,499
Tuning: Custom tuning required
Compatibility: F chassis B58 compatible
While XDI stage 1 and stage 2 HPFPs increase spritz by a substantial value over the factory fuel pump, it is nonflexible to justify the price of both pumps when the competition outflows both XDI options at a significantly lower price. With that stuff said, both pumps can support a significant value increasingly power when running an upgraded turbocharger or a higher-content ethanol blend.
Spool Performance:
1) FX-170: ~50% spritz over stock
2) FX-200: ~100% over stock
Price: $1,399-$1,799
Tuning: Supported by BM3 and MHD
Compatible: F series B58 compatible
These are significantly cheaper than XDI while moreover flowing significantly increasingly as well. Both Spool options are plug-and-play with the B58 and do not require any wearing or splicing in order for them to work. Spool pumps are supported by most major tuners including JB4, MHD, and BM3.
The Spool Performance FX-200 is one of the highest-flowing B58 HPFP options on the market, providing a 100% spritz increase over the stock pump. As a result, it is the weightier pump if you are aiming at massive horsepower goals from an upgraded turbo with heavy support from ethanol.
B58TU (Gen 2) Upper Pressure Fuel Pump Options
At this point in time, the B58TU is still a relatively young engine, and upper pressure fuel pump manufacturers are still in the process of developing higher performance options for the Gen 2 B58. As a result, there are far fewer HPFP upgrade options misogynist for the Gen 2. In fact, Spool Performance is the only visitor with an upgraded HPFP offering for the B58TU. With that stuff said, the Spool pump is extremely capable and should satisfy the needs of any B58TU owner hunting for increasingly power.
Spool Performance
1) FX350 (Gen 2)
Price: $2,299
Tuning: Supported by BM3 and MHD
Compatible: G Chassis (Gen 2) B58 compatible
As with the Spool pumps that we have once discussed, the FX350 is guaranteed to be quality based on Spool’s reputation. In essence, the FX350 is simply the Gen 1 B58 FX200 designed to work with the Gen 2 B58’s 350bar fuel system. As a result, it has similar spritz benefits to the FX200. Spool states that the FX350 has the spritz capabilities to support 800whp on pump gas, 670whp on an E50 mix, and 600whp on full E85.
BMW B58 Upper Pressure Fuel Pump Upgrade Summary
If you are planning on making big power from a BMW B58 engine, fueling modifications are a necessity. While the B58’s stock upper pressure fuel pump is certainly capable, it still taps out rather early considering how easy it is to make lattermost amounts of power from the 3.0L inline-6.
The Gen 1 B58’s HPFP hits a wall at virtually the 450whp mark on pump gas and 420whp when running an ethanol blend. While the Gen 2 B58’s HPFP is much increasingly capable, with limits tropical to 100 horsepower increasingly than the Gen 1 pump, those looking to push vastitude the 600whp mark with their B58-powered BMW or Supra will moreover need to think well-nigh upgrading as well.
While there are a couple of ways to provide the necessary value of fueling to siphon a B58 into stage 2 and stage 3 territory, a upper pressure fuel pump is the easiest, safest, and most straightforward way of doing that.
While a port injection system certainly has its benefits for extremely upper horsepower builds, it moreover comes with the widow headache of installing an variety of auxiliary parts and dealing with the complications of tuning it. A upper pressure fuel pump eliminates all of that hassle.
At this point in time, there are a number of very quality B58 upper pressure fuel pumps misogynist that have been extensively user tested by the community. While none of the whilom pumps are a bad choice, DORCH and Spool are by far the most reputable suppliers in the polity and have shown unconfined results on hundreds of high-horsepower B58s.
