1000+ Horsepower / ZERO Fuel Starvation! The ULTIMATE FD RX-7 Fuel System Using the Factory Tank!

Anyone who takes their FD RX-7 to the track knows one the most annoying problems is fuel starvation! Take a fast turn with anything less than half a tank and there's a good chance exiting that turn your car falls flat on its face because all your fuel sloshed to one side of the tank and the fuel pump pickup sucked in air... Those track days are over with Radium Engineering's new Fuel Hanger Surge Tank for the FD Mazda RX7! The kit replaces the factory in-tank pump and top plate with provisions for 1, 2, or 3 aftermarket high pressure pumps and 1 lift pump in the stock Mazda FD RX7 fuel tank. A unique integrated 1.85L surge tank completely eliminates fuel starvation. No grinding, bending, or modification of the trunk floor sheet metal is required for a completely stock looking appearance! In this video we go over the entire system piece by piece and then install it into a customer car!
Parts Featured:
Radium Engineering Fuel Hanger Feed Kit - FD RX7 / Stainless Filter [PN 20-0455-03] bit.ly/2YOr5JR
Radium Engineering DIY Wiring Kit - Single Pump [PN 17-0031] bit.ly/2YOr5JR
AEM Alcohol Compatible High Flow In-Tank Fuel Pump [PN 50-1220] bit.ly/2GcFMPE
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[@bananahandsfc3s]

Another benefit I am seeing with the in-tank surge design is the surge overflow. Odd that I don't really see it mentioned anywhere (even on radium's website). On external surge tanks you need to return excess fuel from the rail and the lift pump back to the main tank. If you force all returning fuel from the rail to the surge tank with a passive return from the surge to the main tank, positive fuel pressure can develop in the surge tank depending on how well the passive return flows. This surge return pressure can even cause excess pressure at the rail that cannot be eliminated by adjusting the pressure regulator. A better solution for me in this case was to use a Y fitting on the return from the regulator flowing to both the surge and main tank. Fuel takes the path of least resistance eliminating excess pressure buildup and still helping ensure the surge is kept full. The passive surge return is still necessary to accommodate excess fuel supply from the lift pump. This is a complicated solution compared to the in-tank design. With the radium setup here, surge overflow literally just spills out into the main tank from the gaps at the top of the surge. Great benefit to this design that I think should also get highlighted.

[@11114jll]

You should ask Hert if he needs help with his street fd! Always glad to see a new MotoIQ video with Mike keep it up guys!🤙

[@RadDadisRad]

Awesome setup

[@noampitlik2332]

Is there a low PSI (10 or so) pump that fits in this set-up?

[@angryearl]

Silly question, but...does the fuel tank need to be empty/half full during install? My tank is pretty full, and not sure if this will be a problem when installing the lift pump and baffle. Does it just lower and "clip" over the OEM sub tank?

[@angryearl]

@@catwalkcool thanks!!!

[@C1AE86]

I wish they did something like that for the R32 GTR

[@supernice_auto]

they did

[@warrennewton8820]

I bought one like this and I'm struggling where to find the trigger +12v for the second fuel pump. Anyone knows which cable it is on RX7 FD3S?

[@motoiq]

since the FD has one fuel pump from the factory there isnt a trigger wire for a second pump. The stock wiring probably cant handle two pumps so you need to use a relay from the OEM pump trigger and power the second pump direct from the battery with the relay turning it on and off. If you want to stage it, you can do something like use a hobbs switch to make it boost depended or an MSD rpm switch to make it rpm dependent.

[@warrennewton8820]

@@motoiq thank you very much for your help.

[@gunnerhamilton8971]

What rear brace is that?

[@michaelmckay]

Is that a new shirt design?

[@ianp6829]

Mike McKay yes, and Martin has the only one lol