rb25240z

No the rx8 engine is not the same to fit as a series 4/5 engine. Some parts are similar but depends on how your planning the install. There is a couple of challenges. The renesis uses 3 stages of injection and the six port uses variable timing of secondary ports. On top of this the crank sensor is not a commonly used system. Because of this there is only a few ecus that will work in the stock configuration. The stock gearbox does not have a speedo drive as the stock computer collects information electronically. In saying that there is still options. The s1 engine the front cover can be changed to the earlier style front cover to allow a cosmo or s4/5 cas to be used. The dizzy drive gear needs to be swapped at the same time as the rx8 gear is reversed. This option would require an early sump re drilled to suit. The gearbox just use a s4/5 box or there are options for the speedo drive but there not cheap. Alternatively if its a race car the speedo wont be a problem. If you go ahead with the swap send me a pm with any questions. I swapped a 20b into a 240z nearly 10 years ago and am currently putting a bridge port renesis 13b into my rx4 using an electronic dizzy and 48ida weber.

Great looking car, I think your right thats its from a skyline. Do you know if you can use the cv conversion kit that modern motersport sells for the 300zx diffs? How did you fit your diff?

Hello I have purchased a R200 lsd with a 4.375 ratio I think(it has 35:8 stamped on the gear). Im trying to work out which cars its from so I can get parts to fit it into a 240z. It came with 4 bolt cv s that seem to be a bit shorter than the 240 half shafts. The whole rear assembly came from a jap import but the wrecker had know idea what car it was from. Think it might be from a 300zx but is there any numbers or marks to be sure? Thanks for your help.