Righto, in need of some tips for young players!
Just towed the project car from Wodonga to Sydney for its IM240 test. It's an S13 with an RB25DET engine swap. Running stock injectors, a Walbro 255 fuel pump on 98 Octane at the moment. Close to stock turbo, APEXI Power FC computer and a 2.5 inch exhaust with 600 cell cat converter (new).
Had made sure to get the car tuned as emissions friendly as possible (or so I had thought) in preparation for the test. After driving the 6 hours to the testing centre, I bombed the test pretty badly namely the car was running rich at Idle but was passing the test at highway speeds. The testers suggested a better tune and maybe new oxygen sensor as it may be lagging. I'm also reading that switching to E85 and re-mapping may solve the issue. Is it as simple as that or will switching to E85 require major modifications to the engine etc?
Any advice of avoiding this debacle in the future?