Hi Guys,
I have owned the car for over a year now, Its a 2009 E92 from the UK - picked it up with around 24,000 Miles on the clock
Within a few short months, the car was FBO and I was doing monthly track days. I spent quite a bit doing preventive maintenance as I knew I was going to be pushing the car with DD and doing track days
Walnut blasting
Replaced all coilpacks and spark plugs and now running the NGK plugs
Oil change every 3000 Miles
Now the last 2 months I have had issues with car and bit of coin to get it all sorted.
Failed front turbo seal decided to replace both turbos as the car had done now 43,000 Miles
I had the workshop do an engine compression test as I was curious to see how the engine had been holding up since the tune/tracking etc
Results:
Compression was approx. 160 psi +/- 5psi (actually very even) on all cylinders on a cold engine.
After a month of replacing the turbos, I noticed that my whiteish smoke with a blue tinge was coming from the exhausts on deceleration.
Had the car sent back in to find out what was going on, and the shop came back with the following:
Check oil smoke coming out of exhaust, on overrun/back on throttle
Check oil level - ok, within min/max.
Check crankcase pressure - within tolerance at time of check.
Remove aftermarket oil catch can and check quantity of oil - very little at time of check, disconnect breather and run engine - no change.
Disconnect charge pipe from throttle body, check for oil - ok, run engine with charge pipe disconnected - no change.
Disconnect exhaust system at down-pipe connections and check for signs of oil at back of turbo's etc - ok at time of check.
Suspect that oil bypassing at valve stem seals - smoking occurs after (normal) vacuum present in manifold, then throttle opened again. Also, no smoking apparent when engine held at constant higher revs (part load).
So now it looks like I am going to need to replace the valve stem seals to fix the current issue
I was at the local BMW meet the other day and caught up with a new member who was commenting on how he had seen me on the track etc and how my car was spitting flames from the exhaust etc
So I was curious on why the valve steam seals had failed, as other people are pushing their cars way above my HP/tq etc
I then came across this video:
Which raised more questions :S
I noticed some comments on how backfires could damage valve steam seals etc not sure how true that tho!
These vids are with me running the OFT with a wedge map for e50 I have moved onto the JB4 recently havent done a video yet to see if the car still spits flames with the IJOES E85 backend + Map7, probably will do this weekend to test
You can hear the backfires:
Now I know those are def not the burble from the exhaust(23 secs into my vid):
So , is backfires normal on FBO 335is on E85?
would appreciated the advice
thanks
My mod list:
| Stacked JB4 + Flash Tune | FFTEC In-line Fuel Pump | AR Downpipes | Active Autowerke Bov | Active Autowerke Exhaust | Active Autowerke Race FMIC | Active Autowerke Strut | BMS Dual Cone Intake | BMS Oil Catch Can | BMS Thermostat | WaveTrac LSD | Evolution Racewerk Sport Oil Cooler | Michelin Pilot Super Sport tyres | Lux Angel eyes | KW V3 Coilovers | Vossen CV3 Wheels | DEFIV lockdown kit | Cyba Air Scoops | Arkym front lip | carbon side splitters | M3 Front & Rear Suspension Conversion | Apex EC-7 Wheels | Toyo R888 tyres | NGK 5992 Spark Plugs |
I have owned the car for over a year now, Its a 2009 E92 from the UK - picked it up with around 24,000 Miles on the clock
Within a few short months, the car was FBO and I was doing monthly track days. I spent quite a bit doing preventive maintenance as I knew I was going to be pushing the car with DD and doing track days
Walnut blasting
Replaced all coilpacks and spark plugs and now running the NGK plugs
Oil change every 3000 Miles
Now the last 2 months I have had issues with car and bit of coin to get it all sorted.
Failed front turbo seal decided to replace both turbos as the car had done now 43,000 Miles
I had the workshop do an engine compression test as I was curious to see how the engine had been holding up since the tune/tracking etc
Results:
Compression was approx. 160 psi +/- 5psi (actually very even) on all cylinders on a cold engine.
After a month of replacing the turbos, I noticed that my whiteish smoke with a blue tinge was coming from the exhausts on deceleration.
Had the car sent back in to find out what was going on, and the shop came back with the following:
Check oil smoke coming out of exhaust, on overrun/back on throttle
Check oil level - ok, within min/max.
Check crankcase pressure - within tolerance at time of check.
Remove aftermarket oil catch can and check quantity of oil - very little at time of check, disconnect breather and run engine - no change.
Disconnect charge pipe from throttle body, check for oil - ok, run engine with charge pipe disconnected - no change.
Disconnect exhaust system at down-pipe connections and check for signs of oil at back of turbo's etc - ok at time of check.
Suspect that oil bypassing at valve stem seals - smoking occurs after (normal) vacuum present in manifold, then throttle opened again. Also, no smoking apparent when engine held at constant higher revs (part load).
So now it looks like I am going to need to replace the valve stem seals to fix the current issue
I was at the local BMW meet the other day and caught up with a new member who was commenting on how he had seen me on the track etc and how my car was spitting flames from the exhaust etc
So I was curious on why the valve steam seals had failed, as other people are pushing their cars way above my HP/tq etc
I then came across this video:
Which raised more questions :S
I noticed some comments on how backfires could damage valve steam seals etc not sure how true that tho!
These vids are with me running the OFT with a wedge map for e50 I have moved onto the JB4 recently havent done a video yet to see if the car still spits flames with the IJOES E85 backend + Map7, probably will do this weekend to test
You can hear the backfires:
Now I know those are def not the burble from the exhaust(23 secs into my vid):
So , is backfires normal on FBO 335is on E85?
would appreciated the advice
thanks
My mod list:
| Stacked JB4 + Flash Tune | FFTEC In-line Fuel Pump | AR Downpipes | Active Autowerke Bov | Active Autowerke Exhaust | Active Autowerke Race FMIC | Active Autowerke Strut | BMS Dual Cone Intake | BMS Oil Catch Can | BMS Thermostat | WaveTrac LSD | Evolution Racewerk Sport Oil Cooler | Michelin Pilot Super Sport tyres | Lux Angel eyes | KW V3 Coilovers | Vossen CV3 Wheels | DEFIV lockdown kit | Cyba Air Scoops | Arkym front lip | carbon side splitters | M3 Front & Rear Suspension Conversion | Apex EC-7 Wheels | Toyo R888 tyres | NGK 5992 Spark Plugs |