CJM Stage 2 Return Fuel System
Updates; CJM is proud to offer the ONLY billet VQ35DE rails with on-board dampers. Over the years, we have found that some DE's experience ill side effects as a result of removing all the fuel pulsation dampers. What can occur are lean spots at specific RPMs that cause stuttering and hesitation, and no compensation through tuning appears to help. Our original fuel rails without damper provisions have been discontinued. The slight increase in system cost is due to several additional components related to installing the dampers.
Information; Hands down, the most complete and comprehensive solution for 350z's and G35's looking to get nothing short of the highest output available from a single fuel pump. We have had reports of vehicles approaching near 700rwhp with a Walbro 255lph pump and this system.
The trick is to eliminate every single restriction possible. Eliminating restrictions will reduce pressure drop across the system, giving the fuel rails the same pressure as just outside the fuel pump. Every bit of plumbing is as large as possible without going over the top, to make sure that your fuel doesnt hit any bottlenecks on its way to your engine.
Every hose in the kit has crimped fittings on Teflon hoses. By adding a stainless steel braiding to the hoses to increase pressure tolerance and protect the lines, and rubber coating on most lines to protect your vehicles components and wiring harness from the abrasion of stainless braiding, we have actually exceeded OEM quality.
The big hype of the stage 2 kit is the stainless hardpipe that completely replaces the factory 5/16 hardpipe. Our pipe is 1/2" diameter with -8 fittings. It clips into the factory fuel pipe support clips with minor modification of the clips.
Like our stage 1 kit, this kit also re-routes the fuel lines away from the sources of high heat; the exhaust manifolds and turbochargers on the TT vehicles. The fuel lines cross over to the transmission bellhousing and come up the rear of the engine straight into the rails.
This system was also the first RFS conversion to utilize a "return correction", which is a vital modification kit for the fuel pump assembly which allows you to convert to a RFS but still retain the factory venturi siphons. These siphons are absolutely required in order to use the entire volume of fuel in the tank (rather than half), and allow the swirl can to properly function.
The components in this kit will support later addition of our twin fuel pump assembly.
The CJM S2 Fuel Path; Your fuel pump assembly sends the fuel into our fuel pump output fitting. This fitting allows you to connect our pump-to-pipe hose which reaches around the front of the gas tank and hooks up the rear of the stainless hardpipe. The hardpipe follows the path of the factory hardpipe and ends under the passengers foot area. Couple the front of the pipe into a -8 hose (heat wrapped) over to the transmission bell-housing area. It goes up, into a Y fitting where it splits into pair of -6 hoses and into the rear of the fuel rails (fixed with beautiful SS bolts). Out the front of each fuel rail is a -6 hose that cross each others path and loop back along side the rails and into the fuel pressure regulator. From the regulator, the fuel enters the -6 return line, and goes back into the fuel pump assembly via the return correction.
Note; You may opt to disclude the Nissan dampers, o-rings, and clamp plates, if you have a discounted source for Nissan parts.