IM-32-FK Posted May 23, 2020 Share Posted May 23, 2020 Hey all, since I bought my r34 way back in 2015 my car has always been running a rich. It’s just an unopened 25det neo with the stock op6 turbo running just above 12psi , with a blitz front mount, turbo back exhaust with cat, apexi intake, oil cooler and a power fc tune. the thing is the car runs without problems, but when you start revving it past 4500rpm hard and pretty much 12psi or close, it blows a lot of black smoke . So much so that I get soot everywhere on the back of my car and my bumper just above the exhaust is permanently stained . I know running rich means it’s using more fuel then needed but is there more to it? I regularly service my car and change spark plugs every service too (bcpr6es -8). There isn’t anything wrong with how the car runs. It actually runs perfect. No idle issues, no boost cuts, no pinging, no stuttering when climbing revs etc Is there anything I can do to reduce the black smoke? Or is it just the way it is? Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/ Share on other sites More sharing options...
niZmO_Man Posted May 23, 2020 Share Posted May 23, 2020 It's your tune. 1 Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7931506 Share on other sites More sharing options...
KiwiRS4T Posted May 23, 2020 Share Posted May 23, 2020 What do your plugs look like when you change them? Do you have a dyno chart of the afrs? Have you done a compression test? Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7931509 Share on other sites More sharing options...
IM-32-FK Posted May 23, 2020 Author Share Posted May 23, 2020 15 minutes ago, KiwiRS4T said: What do your plugs look like when you change them? Do you have a dyno chart of the afrs? Have you done a compression test? The tips are always white, and the thread on the spark plug is black going down about 10mm. Don’t have the dyno sheet or compression test sheet. Never did it since I bought it. Also, the engine is at 246,000km Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7931512 Share on other sites More sharing options...
Ben C34 Posted May 23, 2020 Share Posted May 23, 2020 Reading plugs doesn't count for much unless you put fresh plugs in, do a wot pull and shut it down straight away. I would put money on the tune is too rich in the boosted areas and lean/ok in the cruise areas Get it tuned Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7931513 Share on other sites More sharing options...
IM-32-FK Posted May 23, 2020 Author Share Posted May 23, 2020 14 minutes ago, Ben C34 said: Reading plugs doesn't count for much unless you put fresh plugs in, do a wot pull and shut it down straight away. I would put money on the tune is too rich in the boosted areas and lean/ok in the cruise areas Get it tuned No point now. I’m gonna go max hp without unopened motor, for rb25 it’s about 450hp right? New turbo with supporting mods such as fuel pump and reg, ffp, z32 afm injectors etc then I’ll even sack the power fc (because it has fuel cut) get it tuned with either a nistune or ems 6860 so I can get 2 step and anti lag. Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7931515 Share on other sites More sharing options...
GTSBoy Posted May 23, 2020 Share Posted May 23, 2020 15 minutes ago, IM-32-FK said: reg, ffp, z32 afm All of this is wrong. 16 minutes ago, IM-32-FK said: sack the power fc This is OK, but unnecessary, because 16 minutes ago, IM-32-FK said: because it has fuel cut This is wrong 16 minutes ago, IM-32-FK said: 2 step and anti lag Do you hate your driveline? Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7931518 Share on other sites More sharing options...
skylinecouple Posted June 2, 2020 Share Posted June 2, 2020 Jeepers, 8 range plugs ? Very cold. Should foul beautifully. Nothing wrong with power FC. I'm with GTSBOY, fuel cut ? Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7932148 Share on other sites More sharing options...
hardsteppa Posted June 2, 2020 Share Posted June 2, 2020 6 range. .8 gap. Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7932150 Share on other sites More sharing options...
djvoodoo Posted June 2, 2020 Share Posted June 2, 2020 1 1 Link to comment https://www.sau.com.au/forums/topic/480453-rb25det-always-blowing-black-smoke-at-high-boosthigh-revs/#findComment-7932159 Share on other sites More sharing options...
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