Die$eL Posted March 27, 2021 Share Posted March 27, 2021 Hi all I'm fitting a RB25DET NEO into my S130 280ZX. I have the bare engine and box, no mounts or wiring harness etc. I'm planning on squeezing around 400-450hp out without opening the motor. First question: - Do I need to replace the solid fuel lines with larger ones or do i just replace the rubber hoses with larger ones? (I'm using the stock tank with a bosch in-line fuel pump) I have seen mention that the RB drops into the ZX using the stock mounts (not sure if it meant stock RB mounts or stock L28 mounts). Either way, from what I see, the stock L28 mounts wont work. I have a mechanic friend stopping by tomorrow and we will place the engine in the bay to see what needs to be done. WRT gearbox mounts, any advice there? I have the stock bits off the L28. Can any of that be reused? Quote Link to comment Share on other sites More sharing options...
Die$eL Posted April 7, 2021 Author Share Posted April 7, 2021 any advice? Quote Link to comment Share on other sites More sharing options...
grannyknot Posted April 7, 2021 Share Posted April 7, 2021 I believe to original hard fuel lines were 8mm or 5/16" they may be alright but probably better to go up to 3/8" just in case and replace all the flexible lines as well just for safety sake. Quote Link to comment Share on other sites More sharing options...
Die$eL Posted April 8, 2021 Author Share Posted April 8, 2021 cool. will do. Thanks. The plan is to upgrade the supply lines and use the current supply lines for the return as they are bigger than the existing return. Quote Link to comment Share on other sites More sharing options...
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