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

The OP ha a R56.... No SC pulley...

Has it had the carbon build up dealt with correctly? Walnut blast? Not snake oil?

 

Best kit for the R56 is supplied by these folks....

http://howertonengineering.com/mini/

Are you using 92-93 octane now?

 

Cause you get about 30% less mpg due to the fact it has less BTU'S per gallon......so when you do the math...it is almost always more per MILE to run....then add the politics if burning food grown with oil based fertilizers and tractors, then trucked and barged multiple times (yes, ethanol is not compatible with the pipeline system_)....gives folks lots to debate....
Cars that are flex fuel have computers that can (on the fly) adjust for various mixes...oversized injectors to allow this, hardened valves and seats, and updated fuel pumps and hoses......
Just mixing it with e-10 to try to boost your octane is a dangerous path....
Sounds like the op's car is in need of a mechanical fix....not just a bandaid or a magical addaditive.......kinda of wonder if a meth system might be a bandaid for other issues if installed....hard knock (as opposed to ping) is a MAJOR issue.... Parts will come out pretty fast as the block "self ventilates" if it is not stopped pretty fast.......

 

1. Ummmm David.... He just had the valves cleaned (because he has a D.I. Engine)... He's working on the carbon on the pistons...

2. The OP reports some success with BK on the piston tops removing carbon...

3. OP wants to introduce BK into airstream going to the pistons to further clean piston tops...

4. Most D.I. Engines have this carbon issue. Not isolated to BMW...

5. The OP is from California.... Shortage of big number octane numbers from that strange country. He's stuck there...

 

I LIKE INDIAN FOOD...... Heh Heh

Does 102 - 104 make it hotter?

 

DOS used to offer a kit that would inject Seafoam into the intake ahead of the throttle body. This was upstream in the rigid ducting after the intercooler.... It operated at idle while the intake was under vacuum, so the fluid was drawn into the airflow going to the engine.... DOS is no longer in business...

It didn't seem like a complicated setup, and don't know if it removed carbon....

Drill a hole in the rigid pressure pipe, add one of those brass aquarium barbed airline hose fittings (cap it off when you aren't injecting cleaner)..... Add one of those brass flow valves so you can control the amount and the hose end simply goes into the elixir of your choice...

Make sense? Don't know if it will remove the carbon on the piston tops.... But that's where you need to report the results.... Estimated cost.... Probably around $20.00 or so....

 

My suggestion was to use the same method of introducing the elixir of your choice to the throttle body.... Hint: BG44K if this was providing some measure of success for removing the carbon from the pistons.... Never in my wildest imagination would I suggest using Swampfoam....

 

1. Aways run the highest octane fuel you can get. 91, 92, 93

2. BG will not clean your valves because you have a D.I. Engine.

3. Save for a Meth kit because it will spray after the throttle body and wash the back of your valves daily unlike your direct injection system. That's why you have a carbon problem no fuel is washing down the valves of carbon deposits.

4. Thank BMW for another flawed design.

 

no good gas here

there is NO 93 or 92 octane avail in Socal period. There are a few race gas pumps out there but we are currently paying 4.30-4.95 for the piss 91 we do have and the race stuff is 10 bucks a gallon. My R53 has a "safe" RMW tune with a 15% pulley (210 whp 15 lbs boost) and it has not been behaving as the op describes so I am thinking there is something amiss-or he has more boost from a17% pulley and/or a crank pulley. drive it easier till the weather breaks (maybe today but it's gonna be a long summer) or you could meet the melted piston scenario.

 

Could be a carbon deposit causing a hot spot.

 

Well he wants a relatively cheap solution, and the walnut blast option ain't cheap. If you are gonna do that, then just save up for the meth as it will clean up any carbon deposits.

 

Yeah.... If you are knocking as loud as you say.... You will destroy the pistons....

 

Meth feels like a cool 40 degree ish fall day every day your drive all year long.

 

Just get a meth kit and run 92 or 93 octane. Issue resolved.

 

Hmm, So you need something that is cheaper than Meth as a hold-me-over.
1. Try a different snake-oil: I have read that Lucas Octane booster is one of the few that really does increase the octane of the fuel in your tank.
2. Increase the quality of your fuel: Stick with Top tier fuels, like Chevron or Shell, and make sure you frequent a station that is really busy so that the fuel is fresh. DEfinitely stay with 93 Octane if possible.
3. Get a custom dyno tune. Many of us here, will swear by the work of RMW. Even if only a canned tune, Jane can ensure your car is running safely.
4. Review your mods/maintenance? Have you done something to significantly upset the AFR? Something to limit the fuel, or add tons more air? Even check things like the fuel filter. If this was in 1st gen I would say, make sure you are not running a SC pulley that is too small (e.g. 19%), but that does not apply here.
5. Get an oil cooler. Lowering oil temps by ~30-40deg is good for overall engine health and sure can't hurt combustion temps. Just make sure to warm the engine properly in cold temps before you take off.
6. Get a better Intercooler. There are several out there that are much better than OEM and will lower your IATs.

Good Luck and take it easy until remedied...

 

With what he spent on bg44k (5 bottles at about $35-45 each) he could have had the car walnut blasted at many shops....
Bg44k is great stuff....
But I am getting the feeling he does not understand that fuel is NOT sprayed onto the back of the intake valves to cool and clean them in a DI motor like in a traditional fuel injected motor....sure his injectors and piston tops are clean....but valves were NOT helped one bit with bg44k in a DI motor.....

 

I can not stress this enough.....NOOOOOOOOO!

It's cooling down this week in LA.