The Radium Engineering 20-0777 V2 FPD-XR is an extended range fuel pulse damper for high-performance and boosted fuel systems. Designed to absorb oscillating pressure pulses created by fuel injector opening and closing, the FPD-XR stabilises fuel rail pressure across the entire RPM range — correcting idle surge, erratic lean AFR spikes, and "stumbling" that are difficult to tune out, especially with high-flow injectors.
V2 Update: Even after tightening, the 8AN ORB damper (20-0777) swivels freely, allowing the vacuum reference port to be clocked 360° for easy routing in any installation.
What Makes Radium FPDs Unique?
Unlike basic fuel pulse dampers, Radium FPDs feature a vacuum/boost reference port that allows the damper to maintain correct performance even at elevated fuel pressures. This is essential for boosted applications running a 1:1 rising rate fuel pressure regulator, where fuel pressure rises with boost and a non-referenced damper would become ineffective.
FPD-R vs FPD-XR — Which Do I Choose?
Both dampers share the same function but have different base static fuel pressure operating ranges:
FPD-R (green top, 20-0776) — base static pressure: 40-70psi. Slightly shorter for space-constrained applications.
FPD-XR (black top, 20-0777) — base static pressure: 40-105psi. Extended range for higher base pressure applications.
Base pressure = fuel pressure measured with the pump running and no vacuum line connected to the regulator.
Important: The ranges above are base static pressures only. Dynamic pressure created by a rising-rate FPR outside this range is acceptable, provided the base static pressure is set within the specified range and the vacuum/boost reference line is connected.
Worked Examples
Example 1 — Mitsubishi EVO: OEM base static pressure 43.5psi, 30psi boost, rising rate FPR.
FPD-R: ✔ Yes — base pressure within 40-70psi range. Vacuum/boost reference line must be connected.
FPD-XR: ✔ Yes — max fuel pressure (73.5psi) does not exceed 105psi. Reference line not required but recommended.
Example 2 — BMW E46 M3: OEM base static pressure 72.5psi, 20psi boost, rising rate FPR.
FPD-R: ✘ No — base static pressure exceeds the 40-70psi range.
FPD-XR: ✔ Yes — max fuel pressure (92.5psi) does not exceed 105psi. Reference line not required but recommended.
Key Features
Extended range: 40-105psi base static pressure — suits a wide range of high-pressure fuel systems
Vacuum/boost reference port — maintains correct damper performance under boost with a rising rate FPR
360° swivel vacuum port — V2 design allows clocking after installation for easy routing
8AN ORB connection — Viton O-ring sealed, compatible with standard AN fuel rail fittings
3/8" NPT version also available — tapered pipe thread seal (see 20-0776 for FPD-R)
Mounts at any angle including upside down — flexible installation for any fuel rail layout
E85 and alcohol fuel safe — compatible with all fuel types
✔ Vacuum/boost reference port — industry-leading performance under boost
✔ V2 360° swivel vacuum port — easy installation in any orientation
✔ Trusted by professional motorsport teams and serious enthusiasts worldwide
✔ Exclusively distributed in Australia by Coore
Genuine Radium Engineering product. Stocked in Sydney for fast Australian delivery. Best mounted directly on the fuel rail. Download installation instructions for full setup guidance.
We endeavour to ship all regular and stocked items on same day, next day or within 5 business days of your order being placed
Custom orders may take longer than regular shipping times but will have information about shipping time on the listing
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All Items purchased from PRP are to be installed by a qualified mechanic at a licensed workshop
Modifying your vehicle is illegal in some states and territories, the customer acknowledges that it is their responsibility to abide by the law and take the appropriate measures to ensure that their vehicle is roadworthy
PRP assumes no responsibility for any work carried out, modifications made or parts supplied with regards to road use, as all our products are intended for track use only
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Effective September 2024, refunds will not be provided for change of mind, incorrect choice or custom ordered products.
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If items are damaged due to courier or otherwise neglect outside of your or PRP's control, you must notify PRP within 14 days of receipt or the claim is void.
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Anodizing is done in house with state of the art equipment and we hold stock of most popular colour's. We anodize generally within 48hrs. No refund nor partial will be provided if your request is inside the 48hr period and you require urgent parts however we will always do our best to meet your needs.
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Silicone Hose Kits: Please note that our silicone hoses have been designed and tested for the vehicle models mentioned. They may fit other vehicles with the same engine model, however the purchase and installation is at your own risk. Due to extensive model changes throughout the years, we are unable to supply or customize hoses in alternative lengths or sizes beyond what is offered. The kits might not contain every hose you want, but we have made every effort to include the series changes to cover the majority of needs. This means we might include hose/s that don't suit your series as a bonus. We strongly advise that you carefully review all photographs provided before making your purchase. PRP does not offer refunds or partial refunds for hoses that are not included in the kit unless they are explicitly shown in the photographs and missing from your delivery.
Warranty Policy
Warranty is for a full refund or exchange provided the item was purchased through PRP or one its approved resellers or workshops.
Warranty is void if you tamper with products or bring them back in a different state to which they were sold to you.
Warranty does NOT cover costs of shipping to and from in any circumstance.
All Items/Products/Services purchased from Platinum Racing Products are to be installed by a qualified mechanic at an approved workshop and ALL warranty claims are dependent on proof of appropriate installation and verification of failure.
Modifying your vehicle is illegal in some states and territories, the customer acknowledges that it is their responsibility to abide by the law and take the appropriate measures to ensure that their vehicle is roadworthy.
Platinum Racing Products assumes no responsibility for any work carried out, modifications made or parts supplied with regards to road use. All our products are sold and intended for track use only.
Lifetime warranty refers to certain Platinum Racing Products branded components and generally does not include 3rd party suppliers and their parts. Manufacturer warranty applies to items including but not limited to alternators, turbochargers, electrical sensors, ECUs and associated parts, tyres, etc.
Due to customer and external components not supplied by PRP, flat drive oil pumps and components are limited to 1 yr warranty with specific cases reviewed before honoring. Spline drive will remain to have lifetime warranty, but again only after specific review.
All refunds and warranty claims are based on back to base review and parts will need to be returned to HQ for assessment unless otherwise arranged.
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