2nd Gen R56 Cooper S Most liked posts in thread: How to curb pre-ignition and detonation in this hot weather?

Sorry for my absence, been helping the mother out with her Colon Cancer!

Just for the record my engine doesn't knock per say, it has pre-ignition when ambient temperatures are 85-100 degrees low humidity in 3rd-4th gear above 3000 rpms under moderate to hard acceleration. Medium to high humidity I can do hard acceleration (like racing hard) with no issues or pre-ignition.

My Mini is running very strong, starts like a new engine, idles like a champ and oil consumption is low for an N14 engine. I've driven 2500 miles on this oil change and only had to add less than half a quart, so figure 1 quart oil added every 5000 mile oil change interval.

When I had the walnut blasting performed late last year it really wasn't that bad when compared with other members N14's, looked more like and N18 at 60k. Running 5 bottles of BG 44K Fuel System Cleaner in the past 5 months (1 per month) has greatly decreased pre-ignition to a point where it does not occur in cold weather anymore!

BG 44K Fuel System Cleaner has done a LOT of cleanup immediately around the spark plugs (silverish color now), if I install a hotter spark plug that would increase the heat in combustion chambers you would think it would remove more carbon with the added heat? That was more of a question.

Anyone recommend any procedure short of removing the head to clean ALL of the thin layer of carbon covering the outer half of my pistons? What's the most evasive chemical injection treatment (via throttle body) for removal of the rest of the carbon in combustion chambers?

Thank you all for sticking there!

 

I'm just trying to imagine the engine running of 100% chemical carbon cleaning solvent versus gas mixed with 11 ounces of carbon cleaning solvent...? I contacted a BG Service Center that would inject a mist like fog into the throttle body much like that of meth injection using pure cleaning solvent for 15-20 minutes.

They want $159.99 ($129.99 for AAA members) for the service which wouldn't be that bad if it made a difference, but I'm wanting feedback first from someone who has had this type of service before. Perhaps there's another company who can offer and even better service than BG, BG is the only company I have found in my research that offers such a service.

Feedback needed and wanted. :smile5:

 

Seafoam proved useless by many users, members using seafoam were surprised to see at that carbon still forming on the intake valves.

Thank you for the reply though. :wink:

 

That about sums it up! :lol:

I believe I have noticed something crazy, I have more power with the AC on Max! I drove extensively today with and without the AC on Max, my butt dyno is not wrong! :confused5:

 

This BG service center is starting to drive me away, tech told me after the service was performed I would need MINI to reprogram my throttle body! The I asked the tech is this service like a seafoam treatment, he said that it was a seafoam! I need to contact BG corporate.

Can anyone show me how a stealthy installation would look like? I'm will to take a chance voiding my warranty if it's stealthy enough to go almost unnoticed. The weather today was 64 degrees, sweet! :drool

I appreciate it!

 

I have an off topic question, I'm wanting to trouble shoot what I think is a flapping wastegate at 1750 rpms, it goes away before 2000 rpms. I want to unplug the vacuum line to the turbo actuator and then seal the vacuum line and drive it to see if that flapping noise is still present, will this harm my engine or turbo?

Thanks,
Systemlord.