[scott135i]

Originally Posted by Seattle335

Looked on the BMS site - I could not find anything about the Stage 2 for the N63 - is this still in beta? is Stage 2 just a download?

In beta for at least the next few weeks/months. More likely weeks...


It's a new control box and 8 new wires you need to install into the harness and into the actual ECU by removing the connectors... its a pin out install.

BMS has posted a video, go to N54tech for it.

[wzj519]

Originally Posted by scott135i

In beta for at least the next few weeks/months. More likely weeks...


It's a new control box and 8 new wires you need to install into the harness and into the actual ECU by removing the connectors... its a pin out install.

BMS has posted a video, go to N54tech for it.

Hey Scott, how is your n63tu engine with BMS tune going so far?
I am still waiting to put it on once spring comes to Canada.

BTW, since your car has identical tranny and engine as mine.
May I ask you do you have any jerky shift feeling when the car is cold?
Also what's your engine idle speed? Mine idles at 500RPM when A/C off, and it causes the vibrations of the the car.
Just want to know is my car performance normally. BTW, mine is a 13 650GC.

[badblack550xi]

Originally Posted by wzj519

Hey Scott, how is your n63tu engine with BMS tune going so far?
I am still waiting to put it on once spring comes to Canada.

BTW, since your car has identical tranny and engine as mine.
May I ask you do you have any jerky shift feeling when the car is cold?
Also what's your engine idle speed? Mine idles at 500RPM when A/C off, and it causes the vibrations of the the car.
Just want to know is my car performance normally. BTW, mine is a 13 650GC.

hes car is a N63 none TU

[scott135i]

Originally Posted by wzj519

Hey Scott, how is your n63tu engine with BMS tune going so far?
I am still waiting to put it on once spring comes to Canada.

BTW, since your car has identical tranny and engine as mine.
May I ask you do you have any jerky shift feeling when the car is cold?
Also what's your engine idle speed? Mine idles at 500RPM when A/C off, and it causes the vibrations of the the car.
Just want to know is my car performance normally. BTW, mine is a 13 650GC.

I have a 2013 550XI which has the older non-TU engine, so can't compare apples to apples. You'd need to compare with 2014+ 550s

[badblack550xi]

Originally Posted by combatbmw

racegas dont couunt. beeshboy

just an FYI i ran 12.1 on 93 and 11.9 with NOS octane booster ($9 at wall mart) no race gas.

[Deslypher]

Originally Posted by badblack550xi

just an FYI i ran 12.1 on 93 and 11.9 with NOS octane booster ($9 at wall mart) no race gas.

When mode are you in when you do your runs? Are you in Sport+ and shifter to the left? do you let the CPU autoshift for you or are you paddle shifting? Just curious to see what is the best way to run my car.

TIA! I know

[badblack550xi]

Originally Posted by Deslypher

When mode are you in when you do your runs? Are you in Sport+ and shifter to the left? do you let the CPU autoshift for you or are you paddle shifting? Just curious to see what is the best way to run my car.

TIA! I know

Sports + to the left... i let the car shift don't really make a difference down 1/4 60 foot is more important in our cars.

[Deslypher]

Originally Posted by badblack550xi

Sports + to the left... i let the car shift don't really make a difference down 1/4 60 foot is more important in our cars.

thanks

[doppelganger1]

I just happened on this thread so I'm way late to comment, but I believe I know the answer to the riddle of why the N63Tu motors lose hp/tq at higher rpm: The cause is the Valvetronic head, which is on the N63Tu but not the N63. The Valvetronic head has an additional cam and finger followers that modulate the intake valves to regulate throttle (fuel intake). This is a complex arrangement and at higher rpm wot the finger followers tend to "float" which reduces throttle response, increases fuel consumption and also increases CO and NOx emissions. There are two solutions: (1) increase the spring rating (tension) on the finger springs so they can keep up with the rpm; however, this adds friction which decreases hp/tq slightly, increases fuel consumption and increases engine wear, or (2) have the ECU reduce power (hp/tq) at higher rpm so the finger followers are less modulated and can keep up. BMW chose the latter (2) on the N63Tu motor as the lesser of two evils. The S63Tu also has Valvetronic, but the engine is much more powerful and of higher quality (wear resistant), so BMW used solution (1) which does not result in hp/tq dropoff at higher rpm.

[1320racer]

Originally Posted by doppelganger1

I just happened on this thread so I'm way late to comment, but I believe I know the answer to the riddle of why the N63Tu motors lose hp/tq at higher rpm: The cause is the Valvetronic head, which is on the N63Tu but not the N63. The Valvetronic head has an additional cam and finger followers that modulate the intake valves to regulate throttle (fuel intake). This is a complex arrangement and at higher rpm wot the finger followers tend to "float" which reduces throttle response, increases fuel consumption and also increases CO and NOx emissions. There are two solutions: (1) increase the spring rating (tension) on the finger springs so they can keep up with the rpm; however, this adds friction which decreases hp/tq slightly, increases fuel consumption and increases engine wear, or (2) have the ECU reduce power (hp/tq) at higher rpm so the finger followers are less modulated and can keep up. BMW chose the latter (2) on the N63Tu motor as the lesser of two evils. The S63Tu also has Valvetronic, but the engine is much more powerful and of higher quality (wear resistant), so BMW used solution (1) which does not result in hp/tq dropoff at higher rpm.

Has all of this info been confirmed?

[DuSh]

Originally Posted by 1320racer

Has all of this info been confirmed?

I asked a guy who fixes n63tu/s63tu engines and he said spring rates are same between the n63tu/s63tu engines, so I think it's a false assumption
He said due to high EGT power is reduced at high rpms, but I'm not sure if that's true either

[Thecastle]

Originally Posted by DuSh

I asked a guy who fixes n63tu/s63tu engines and he said spring rates are same between the n63tu/s63tu engines, so I think it's a false assumption
He said due to high EGT power is reduced at high rpms, but I'm not sure if that's true either

I know this is long dead, but from the dyno graphs it looks like small turbos reaching their peak airflow/ efficiency.