What sets Nostrum apart:
- Stage 2 Injectors flow 66% more than stock
- 63% more HPFP flow than stock
- Direct fit, no harness or spacers required
- Comprehensive install solution - evreything you need is in the box!
- Ethanol compatible
- OEM equivalent spray pattern
- Every injector is tested statically and dynamically to ensure best quality product and set batching
- Optional pulse damper
- Includes detailed installation guide
Unlike the previous S55 with its dual pump setup from the factory, the B58’s are stuck with a single HPFP which is one of the biggest limiting factors keeping you from making more horsepower. This is where the Nostrum B58 Gen 1 Big Bore kit comes in! Flowing an astounding 63% more fuel than stock, the Nostrum HPFP’s will provide your engine with the additional fuel it so desperately craves. The Nostrum HPFP kit requires no permanent modifications, allowing you to revert your vehicle to stock in the future.
Our pumps are completely ethanol compatible, giving you the added benefit of being able to run e85 or blended ethanol fuel. Ethanol is wonderful on turbo cars, as it has a higher octane rating and is less prone to knock than 91/93 pump gas.
We have created the ultimate bolt-on fuel solution by bundling our HPFP kit with our Stage 2 injectors! Flowing 66% more fuel than the stock B58 Gen 1 injectors, our Stage 2 injectors allow for significant gains in peak horsepower, when properly tuned.
Every Nostrum manufactured part is backed by a limited lifetime warranty. Our products are comprehensive solutions that come complete with everything you need inside the box, including detailed installation instructions. Tuning guides are also available for your dealer or tuner. We have customer service and calibration engineers on staff to provide you with any support that you may need, from installation to tuning.
Frequently asked questions:
- Is this compatible with the Gen 2 B58?
The Gen 1 HPFP & injectors are compatible with the Gen 1 B58 only. The Gen 2 B58, like the one found in the A90 Supra, uses a 350 bar high pressure fuel system from the factory, where the Gen 1 engine uses a 250 bar system.
Be sure to follow our social media for all of our future B58 developments!
- Is the HPFP compatible with aftermarket camshafts?
Our Big Bore HPFP kit is intended to be used with the factory B58 Gen 1 camshaft. We cannot guarantee compatibility with aftermarket parts.
- I see a lot of mentions about OEM equivalent spray patterns. What does that mean and why is it important?
While increasing flow rate is critical to making more horsepower, there are other factors to consider when choosing fuel system upgrades. A bigger injector isn’t always a better injector! It can flow a large volume of fuel at WOT, but if the spray pattern is poor, you can expect poor idle quality, poor drivability, increased knock propensity, soot, NVH (noise vibration harshness,) and tuning difficulty. Additionally, the wrong spray pattern can result in liquid fuel impinging in the cylinder walls, causing oil dilution, which increases mechanical wear to internal engine components.
Nostrum has invested significant time and resources into acquiring the equipment and machinery necessary to deliver an OEM level of quality on our injectors. Our spray patternation and arc flash machines (images below) give us an unparalleled look at how an OEM injector is designed and how it operates. Our engineers design and develop injectors to optimally interact with engine air flow inside the combustion chamber to improve fuel evaporation and create a homogenous air-fuel mixture that results in a higher combustion quality. For you, this means that you can expect our injectors to perform at their absolute best regardless of what you are asking from them, from daily driver duty to setting new ¼ mile records.
Dyno graph sponsorship results:
Local sponsor with a modifed B58 was able to achieve 653 whp/602 lb/ft of torque with the Nostrum Stage 2 bundle! 
*Horsepower and Torque numbers are approximate and can vary significantly depending on numerous factors including what supporting upgrades are done to the vehicle, ambient temperature, elevation, road surface, tire selection & condition, fuel octane and quality, vehicle weight, and more. The advertised numbers herein are based on optimal conditions and utilizing proper supporting modifications. Your results may vary.
