steveff
08-08-2016, 09:30 AM
What's up guys. Having a few issues with my RB (shocker, right?) and wanted some opinions because it's hard to find good information in my area and I'm not finding too much online. I search every day so I'm not being lazy.
Let me start by saying this IS a drift car. Sees street time but it's mainly just testing.
Issue #1:
Having crazy blow by issues with my motor. Running an rb25 turbo at 13psi. Street driving it's fine but at the track last event I was blowing by a liter of oil in 2 laps. Literally rigged a catch can to a catch can just so I can run it more than one lap at a time. Compression is perfect, dead nuts, on every single cylinder. No smoke out the exhaust of any kind or color. Every so often it blows oil out the dipstick too. Going to run a larger catch can with larger ports for more crank pressure release. And potentially just run a drain from the catch can to the sump unless I figure out the issue, if there is one.
Issue #2:
Every so often, when at 13psi I lose power after 5k. Feels like I lift up on the throttle almost like its retarding timing a shit ton. Doesn't sputter or fuel cut or surge. Just feels like I have 50hp. Octane booster helped the issue, made it only happen about 15% of my runs. But it still happened every once in a while. I'd be in 3rd pegging the limiter on one turn and bogging in 2nd, fighting to keep revs up around the next turn. (And no, I wasn't just bogging the motor, it was well in the normal power band)
Before octane booster it cuts power 80% of the time. After octane booster it cuts power 10-15% of the time. Only run Shell 93 v power nitro. And have a walbro 255 pump.
Tuned by RS Enthalpy. Have Splitfire coils so I doubt it's not getting enough spark up top. Putting new plugs in today. Switching from NGL BKR7 to NGK BCPR7 to see if it helps.
Also going to test voltage at fuel pump to see if it's dropping off, but air fuel ratio doesn't lean out when I have the drop in power. Battery voltage and boost pressure read the same as well. Holds 13psi just feels like it has no power.
Picture of my car for shits and giggles.
http://uploads.tapatalk-cdn.com/20160808/40d5b012a7ce176eabe74d030198fea6.jpg
Sent from my iPhone using Tapatalk
Let me start by saying this IS a drift car. Sees street time but it's mainly just testing.
Issue #1:
Having crazy blow by issues with my motor. Running an rb25 turbo at 13psi. Street driving it's fine but at the track last event I was blowing by a liter of oil in 2 laps. Literally rigged a catch can to a catch can just so I can run it more than one lap at a time. Compression is perfect, dead nuts, on every single cylinder. No smoke out the exhaust of any kind or color. Every so often it blows oil out the dipstick too. Going to run a larger catch can with larger ports for more crank pressure release. And potentially just run a drain from the catch can to the sump unless I figure out the issue, if there is one.
Issue #2:
Every so often, when at 13psi I lose power after 5k. Feels like I lift up on the throttle almost like its retarding timing a shit ton. Doesn't sputter or fuel cut or surge. Just feels like I have 50hp. Octane booster helped the issue, made it only happen about 15% of my runs. But it still happened every once in a while. I'd be in 3rd pegging the limiter on one turn and bogging in 2nd, fighting to keep revs up around the next turn. (And no, I wasn't just bogging the motor, it was well in the normal power band)
Before octane booster it cuts power 80% of the time. After octane booster it cuts power 10-15% of the time. Only run Shell 93 v power nitro. And have a walbro 255 pump.
Tuned by RS Enthalpy. Have Splitfire coils so I doubt it's not getting enough spark up top. Putting new plugs in today. Switching from NGL BKR7 to NGK BCPR7 to see if it helps.
Also going to test voltage at fuel pump to see if it's dropping off, but air fuel ratio doesn't lean out when I have the drop in power. Battery voltage and boost pressure read the same as well. Holds 13psi just feels like it has no power.
Picture of my car for shits and giggles.
http://uploads.tapatalk-cdn.com/20160808/40d5b012a7ce176eabe74d030198fea6.jpg
Sent from my iPhone using Tapatalk