CJM Road Race Fuel Pump, Production Round 4

phunk

References:
Conception to Production Round 1
Production Rounds 2 & 3
Ordering & Deposit Link

CJ Motorsports 370z Road Race Pump



With production underway, its time to make the 4th batch official.

The CJM 370z RRP functions as an in-tank fuel surge canister. It mounts inside the tank behind the driver's seat, and works in coordination with the factory fuel pump module (via in-tank hoses) that resides behind the passenger seat.

With over 50 produced and in-use, it is the only time-tested and proven bolt-in and reversible solution to fuel starvation in the 370z. It doesn't only reduce fuel starvation, it eliminates it. Until the fuel tank is so close to empty that fuel pick-up would no longer be a rational expectation, this product is customer proven to maintain fuel system pressure. Typical reports are that the vehicle can still be raced with the low-level-light active. While it is not entirely recommended to run the tank completely dry (since this will reduce the factory fuel pump's lifespan), you will now be given a choice to refill the fuel as you see fit.

The only component of the installation that remains outside of the fuel tank is the wiring to energize the fuel pump inside the Road Race Pump. There are no external fuel lines or canisters added to the vehicle with this solution.

The RRP, in standard configuration, holds a Walbro 255lph fuel pump. Its not a normal Walbro 255, it is a special model with a second stage. The second stage of this pump is a solid-state jet pump used for the RRP's self-filling feature. This means that, not only is the RRP surge canister fed by the standard fuel pump (on passenger side) as an ordinary surge canister is, but it also pulls in fuel itself from the driver's side of the tank.

A secondary function of the RRP is to over-flow surplus fuel back to the factory fuel pump module. This is to extend the pump life of the factory fuel pump by assisting in keeping it "wet" when it may otherwise be starving dry.

Please feel free to post any questions.

I expect to start shipping this batch by March. I included an ordering & deposit link at the top of this post. A reservation is required to *guarantee* a unit, but at this point it is unknown if the demand will be great enough to require the reservations. A full payment is also an option, but is not required until your order is ready to ship.

I would like to address a couple very common questions about the RRP.

Q: Is the RRP E85 compatible?
A: Yes. Like all fuel system components, the fuel pump within the RRP and the fuel lines added inside the tank to interface it, may experience a decrease in service life with E85 in some conditions. However, there is no need for exceptional/additional concern with the RRP.

Q: Is the RRP compatible with my Return Fuel System
A: Yes, the RRP is essentially irrelevant to a RFS conversion, and installation of a RFS and RRP have no overlap. However, take note that the RRP's 255 will be the pump sending fuel to the engine & rails, and whichever pump is in the factory module will only be sending fuel to the RRP canister.

Q: Can the RRP support high power?
A: Out of the box, the RRP will support around 500-550rwhp with gasoline, or 350-375rwhp with E85. A little more with a return-fuel system upgrade. The RRP includes an unused secondary fuel pump position for when the engines fuel needs are greater than the included 255 can support. This secondary position can accommodate another 255, or a 340, 450, or any other fuel pump with the same main diameter as a Walbro or direct-fit replacement. Once the RRP has been converted to a twin pump, it would be recommended to upgrade the factory fuel pump module with a 255 or perhaps even a 340.

Q: Can I change the RRP's 255 to another pump?
A: Maybe. The RRP was designed to perform as well as it does by depending on the included special model Walbro 255's integrated jet-pump to activate a self filling function. To replace this special version of the Walbro 255 will defeat the RRP's self-filling ability (other than a small gravity check valve also built in to it). It is, to the best of our knowledge, untested and unproven as to how well the RRP will perform with its self-filling defeated. However, should anyone wish to try it, they would need to know that the fuel pump position the 255 resides in will not fit the larger 400/450 fuel pumps, just the single diameter pumps like other 255s, or an Aeromotive 340, or AEM, or other same-diameter pumps. There is also a hole under this 255 that would need to be plugged.

Q: Can the RRP be installed to a G37?
A: Unfortunately it cannot. A G37 fuel tank is much shallower than a 370z fuel tank, and this product is much too tall to fit. A custom G37 unit could be produced one-off, but it would require some leg-work of the customer (providing us with some measurements).

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ban25

Reserved!

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Coyote

One quick question: is this special fuel pump thing new fire this batch or was that already in the previous ones?

Envoyé de mon Nexus 5 en utilisant Tapatalk

phunk

All previous batches as well!

Only a few cosmetic changes have occurred and in-tank hose construction has had a couple versions.

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BGTV8

PM sent

derraj06

Working on my build plan currently. I should be reserving one in the next week or two unless something changes.

street2soul

reserved

takjak2

4th round! I have been sporting this setup on track since the first batch. Even transferred it to a second car. Excellent product, excellent support from CJ. Give him your money!

Then buy a set of these. 3 Piece Long Reach Hose Grip Pliers

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TerribleONE

I really should get in on this.. Gonna have to talk to F.I. about labor for the install would be nice not having to cringe making a long right turn under half a tank.

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Spooler

I am in, reserve me one.

Spooler

Phunk, I need to call you so we can talk fuel for a turbo upgrade in the future. I am thinking about doing all my supporting mods first, then the Turbo upgrade a year later. I am thinking of doing a 3 step upgrade. Fuel, LSD, and clutch/flywheel first. Turbo upgrade next. Then a year later, rods, pistons, and exhaust cams. That way I don't have to pull all the money out my butt at once.

Felix 808

So as I read the above passage, it would seem that the RRP would provide fuel to the engine even if the factory pump failed, is this correct? Could you run the RRP as a stand alone pump with a Hydra mat setup to scavenge fuel from the entire tank?

Thanks

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phunk

I am working on a hardware kit to ease the RRP's high horsepower applications. I think I can put together a relatively inexpensive package to get it to function properly as a single pump with a Walbro 450/E85 pump in it so people can make it to 600-700hp without having to turn the RRP into a twin pump.

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phunk

The RRP is self-filling from the drivers side of the tank, much like how the factory pump is self-filling from the passenger side of the tank.

If the factory fuel pump was removed, the RRP would lose its supply of fuel from the passenger side. This would cause it to have its own starvation side effects as it would not have any supply of fuel from the passenger side.

The RRP is a mostly closed canister, very similar to an external surge canister only it resides inside the tank. Anything attached to the fuel pump would also be contained within this canister... so if anyone devised a way to attach a hydramat to the pump inside the RRP, it would not really serve a purpose as the hydramat would not be exposed to any fuel outside of the RRP canister.

The RRP in its intended layout has proven to resolve starvation to the fullest... so I cannot say I see any purpose in trying to increase its function with a hydramat, as it already outperforms one.

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Felix 808

Reserve payment sent

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