[Bours]

Originally Posted by Pladi

thanks man i know urs will be rebuilt so makes sense. I have a feeling ur engine has bent a rod. Mark my words. (more speculations lol)

Ok ill give you the answer shortly ! Well see if you are right ! Thoughts on forged pistons for cold climate ? Should i keep them oem but coat them to avoid slapping ?2

[Pladi]

Originally Posted by Bours

Ok ill give you the answer shortly ! Well see if you are right ! Thoughts on forged pistons for cold climate ? Should i keep them oem but coat them to avoid slapping ?2

I built a forged motor myself for a mazdaspeed 3. You have to be careful with piston wall clearance. Its tricky. Forged pistons have a higher coefficient of thermal expansion. They tend to expand and contract more. Which means at cold weather you might get some piston slap because of that larger space. You can buy pistons that do that less but have to have tighter clearance. But are not as strong(like OEM).

Its the balance between strength and expansion.. more strength also more expansion and vice versa.

[Bours]

Originally Posted by Pladi

I built a forged motor myself for a mazdaspeed 3. You have to be careful with piston wall clearance. Its tricky. Forged pistons have a higher coefficient of thermal expansion. They tend to expand and contract more. Which means at cold weather you might get some piston slap because of that larger space. You can buy pistons that do that less but have to have tighter clearance. But are not as strong(like OEM).

Its the balance between strength and expansion.. more strength also more expansion and vice versa.

Great info but im so confused ! Would you go forged or keep oem and coat them if it was your car ?

[Pladi]

Originally Posted by Bours

Great info but im so confused ! Would you go forged or keep oem and coat them if it was your car ?

For me ill tell you based on experience i would NOT get forged pistons. They are a thing of the past with hot rods when timing and fuel delivery was an issue. Today with a "live" motor where the DME adjusts on the fly for knock you dont need forged pistons unless ur racing the car only and its gonna be 1000 HP plus. Personally i dont think the N55 is THAT platform. The Toyota Supra YES. N55/N54 is not a good platform for power.

Go with OEM pistons if you can.(and the reason i say if is because sometimes after honing/boring the cylinders they have to go a size up and OEM might not work, but thats only if you have a worn cylinder wall..which you probably dont) So far i think the Pistons on this motor are not a weak link so dont change them because its tricky. Rods you can..

Thats my 2 cents.

[Bours]

Originally Posted by Pladi

For me ill tell you based on experience i would NOT get forged pistons. They are a thing of the past with hot rods when timing and fuel delivery was an issue. Today with a "live" motor where the DME adjusts on the fly for knock you dont need forged pistons unless ur racing the car only and its gonna be 1000 HP plus. Personally i dont think the N55 is THAT platform. The Toyota Supra YES. N55/N54 is not a good platform for power.

Go with OEM pistons if you can.(and the reason i say if is because sometimes after honing/boring the cylinders they have to go a size up and OEM might not work, but thats only if you have a worn cylinder wall..which you probably dont) So far i think the Pistons on this motor are not a weak link so dont change them because its tricky. Rods you can..

Thats my 2 cents.

Thank you buddy ! Final choice : Oem coated pistons + carillo forged rods

After research all you said makes a lot of sense

[xxMike61]

So in the past week or so I've noticed that my engine sounds louder than usual. Not the exhaust or anything related to that but I hear things spinning more I guess. Like the higher RPMs I go the louder it is (duh) but I haven't heard anything like this before. There's almost a rhythmic rock/ knock to it. I've taken logs and looked under the hood and all seems well. I am running Mobil 1 0w40 and I am about 5k into this oil run. Since I am very paranoid I will be changing the oil this week and sending in a sample wish me luck.

[maddmatth]

Originally Posted by xxMike61

So in the past week or so I've noticed that my engine sounds louder than usual. Not the exhaust or anything related to that but I hear things spinning more I guess. Like the higher RPMs I go the louder it is (duh) but I haven't heard anything like this before. There's almost a rhythmic rock/ knock to it. I've taken logs and looked under the hood and all seems well. I am running Mobil 1 0w40 and I am about 5k into this oil run. Since I am very paranoid I will be changing the oil this week and sending in a sample wish me luck.

Take it to a BMW specialist, or dealer if you have to, and have them listen to it. They should know right away if something is wrong.

[MTK24]

Oil was changed every 15k miles once the car was purchased in late 2011. After I purchased the car with 60k miles i've done oil changes every 5-7k miles.

I drive the car very hard and do a lot of pulls on the highway. This is after 6,000 miles on liqui moly 5w40. And after roughly 2 quarts of makeup oil added ( i had a ofhg leak).

I switched to liqui moly 5w30 and the car runs much better with less vibration. This engines are good, assuming you keep up with scheduled maintenance.

[Bours]

Originally Posted by Vampire335i

Oil was changed every 15k miles once the car was purchased in late 2011. After I purchased the car with 60k miles i've done oil changes every 5-7k miles.

I drive the car very hard and do a lot of pulls on the highway. This is after 6,000 miles on liqui moly 5w40. And after roughly 2 quarts of makeup oil added ( i had a ofhg leak).

I switched to liqui moly 5w30 and the car runs much better with less vibration. This engines are good, assuming you keep up with scheduled maintenance.

what are your mods ?do you use meth or E ? i use the same oil,

[Ozzie335i]

Ditto on the same oil. 5 - 30. 3 k in and no oil loss. With the BMW stuff the car drank it. I am running PI with all the goodies. Larger oil cooler, and thermostat bypass. 230 degrees max in DFW. Tuning with MHD, and happy with the results at 22 psi so far. Thank you for talking me out of going with 5 - 40 Vampire. Yeah, I noticed how the Liquid Moly was smoother (dare I say slipperier?) than the BMW stuff.

[Bours]

Originally Posted by Ozzie335i

Ditto on the same oil. 5 - 30. 3 k in and no oil loss. With the BMW stuff the car drank it. I am running PI with all the goodies. Larger oil cooler, and thermostat bypass. 230 degrees max in DFW. Tuning with MHD, and happy with the results at 22 psi so far. Thank you for talking me out of going with 5 - 40 Vampire. Yeah, I noticed how the Liquid Moly was smoother (dare I say slipperier?) than the BMW stuff.

I live in quebec which is very cold. Can i still use 5w 30 ??

[MTK24]

Originally Posted by Bours

what are your mods ?do you use meth or E ? i use the same oil,

Just JB4 and FBO.

An occasional E30 mix here and there. No meth yet, on stock turbos

[Ozzie335i]

I can't answer that Bours. I know about the cold up there. Was in Montreal when it was - 40. I'd leave my precious ride in the garage for the winter.

[Pladi]

Originally Posted by Bours

I live in quebec which is very cold. Can i still use 5w 30 ??

BMW now sells 0W-30 at all dealers i run that for winter. 5w-30 summer. BMW oil is top notch. You have to check the specs.

[xxMike61]

Originally Posted by xxMike61

So in the past week or so I've noticed that my engine sounds louder than usual. Not the exhaust or anything related to that but I hear things spinning more I guess. Like the higher RPMs I go the louder it is (duh) but I haven't heard anything like this before. There's almost a rhythmic rock/ knock to it. I've taken logs and looked under the hood and all seems well. I am running Mobil 1 0w40 and I am about 5k into this oil run. Since I am very paranoid I will be changing the oil this week and sending in a sample wish me luck.

So after going with castrol SAE 5w30 this knocking sound is still there. Little to no metal shavings in the oil. I suspect it's something to do with the spark plugs or coils. Took and sample and gonna send it in tomorrow.

[Pladi]

Originally Posted by xxMike61

So after going with castrol SAE 5w30 this knocking sound is still there. Little to no metal shavings in the oil. I suspect it's something to do with the spark plugs or coils. Took and sample and gonna send it in tomorrow.

You sound very paranoid. Calm down Post a video of the sound lets have a hear..

[Unklejoe]

Originally Posted by Bours

have you ever flushed tha at fluid ??? do you notice some jerky shifts or slip ? im at 100 k miles and wondering and i should change teh fluid....

I wouldn't worry about the transmission. I haven't touched the transmission fluid once, and I'm about to hit 200,000 miles this week. I'm sure my fluid is in poor shape, but in real life, it doesn't matter that much unless it's really burnt.

Some people recommend changing it every 30,000 miles, but those are the same people who consider a car with 80,000 miles to be "old".

My car isn't making _crazy_ torque, but it does have a Pure Stage 1+tune (and has for the last 100,000 miles), and I haven't noticed any slipping issues. It does have some jerky shifts occasionally, but I think that's due to a few rough areas in my custom trans map (xHP). I also think that running the Alpina flash since ~100,000 miles has helped prolong the life of the transmission by reducing the amount of slip during WOT shifts.

This sounds ridiculous, but my experience with automatic transmissions has been "don't mess with it if it's working, and don't expect a fluid change to fix any kind of issues you're having". This applies to differentials too.

Engine oil is a different story though.

[Unklejoe]

Just an update:

I'm at ~199,500 miles, and I finally decided it was time to replace my original HPFP.

The car was still running fine, but I noticed that it was taking longer and longer to crank. It's had a shadow code for the HPFP for the last 30,000+ miles, so I knew I was on borrowed time.

As a side note, changing the HPFP on a 2011 335i (N55) was a fairly easy job. There's no need to remove the intake manifold - just the throttle body.

It took about two hours total.

[Welcome to NBA Jam]

Originally Posted by Unklejoe

Just an update:

I'm at ~199,500 miles, and I finally decided it was time to replace my original HPFP.

The car was still running fine, but I noticed that it was taking longer and longer to crank. It's had a shadow code for the HPFP for the last 30,000+ miles, so I knew I was on borrowed time.

As a side note, changing the HPFP on a 2011 335i (N55) was a fairly easy job. There's no need to remove the intake manifold - just the throttle body.

It took about two hours total.

Great to know. Any DIY out there that you used?

[Jeyoller]

Originally Posted by Unklejoe

Just an update:

I'm at ~199,500 miles, and I finally decided it was time to replace my original HPFP.

The car was still running fine, but I noticed that it was taking longer and longer to crank. It's had a shadow code for the HPFP for the last 30,000+ miles, so I knew I was on borrowed time.

As a side note, changing the HPFP on a 2011 335i (N55) was a fairly easy job. There's no need to remove the intake manifold - just the throttle body.

It took about two hours total.

WOAHHHHHHH mind posting your maintenance so far? 200k miles is def my goal now

[xxMike61]

Originally Posted by Pladi

You sound very paranoid. Calm down Post a video of the sound lets have a hear..

https://streamable.com/4qidg
I was getting paranoid this past december and made a few videos like this and they sound similar. And i took those past videos before my oil results came in too. Maybe it's all in my head. Waiting on new oil results now

[Pladi]

Originally Posted by xxMike61

https://streamable.com/4qidg
I was getting paranoid this past december and made a few videos like this and they sound similar. And i took those past videos before my oil results came in too. Maybe it's all in my head. Waiting on new oil results now

just got a chance to listen to this i dont hear anything unusual at all..