[impossiblesrock]

OP, your engine is ok. I redline my car regularly (safely of course), and have had no problems. The N55 is a proven strong engine, and I am sure BMW has conducted thorough tests on it. I am sure even if you had it at or near redline for an extended period of time it would still be ok.

And for that douche in the VW, better luck next time

[Fille]

Originally Posted by impossiblesrock

OP, your engine is ok. I redline my car regularly (safely of course), and have had no problems. The N55 is a proven strong engine, and I am sure BMW has conducted thorough tests on it. I am sure even if you had it at or near redline for an extended period of time it would still be ok.

And for that douche in the VW, better luck next time

Nice... Remind me not to buy a car from you :P

Seriously. Redlining isn't catastrophic but it sure as hell isn't healthy either.

There is NO reason to redline an engine which makes peak power @5800 rpm and has a redline @7000 rpm. See what I mean?

[m6pwr]

I believe Fille is right. There's an old saying, "It's torque that gets you there, and it's horse power that keeps you there." It's torque that influences acceleration.

According to the torque curve for the N55 ( page 13 of the f30 training guide - http://f30.bimmerpost.com/forums/sho...d.php?t=858623), peak torque for the N55 is 300 foot pounds and the "curve" is dead flat all the way from 1200 to 5000 rpm. After 5000 rpm the torque falls off quickly - down to 240 foot pounds at 6500 rpm.

Most books on racing and high performance driving recommend shifting at or just after peak torque so that at the completion of the shift, the engine is in the fat part of the torque curve or just before peak torque. This gives you the best acceleration. Wind it out to the redline and at shift completion you'll be in the part of the torque curve that is already going south fast. All you're doing is beating up the engine.

My 335 with ZF 8 speed is on order so I don't have personal experience, but I wonder how the ecu is programmed in the auto sport or sport+ mode with your right foot planted, accelerating up through the gears? Is it redline or something less?

[Dan_335i]

Originally Posted by diablo2112

And this, folks, is why every single car I drive has a dashcam. Just try this stunt with me, I savor the day some idiot is this stupid. Of course, I'm not going to tell the idiot that pulls this stunt that he's on video. Quite happy to let him make his statement to the police and further incriminate himself with filing a false report.

I could say i braked hard because there was a animal ran in front of the car. It would not matter y i braked hard. Or i could say the vehicle in front of me braked hard so that would cause me to brake hard. It will be hard for u to prove i purposely braked hard. if u rear ended me u would have to be following to close. And this wont work on u if u dont tailgate in the first place. If people tried this stunt to u tht would mean ur tailgating.

[Carnook]

Originally Posted by Ali Shiralian

So after a few kilometres of this, wife said kick his ass.

I like your wife.

[nicknaz]

OP, you have absolutely nothing to worry about. Many people do track days in their car, and that is 20-30 minutes per session of full throttle, high RPM driving. I'm sure some German forum members have left their car on cruise control at 200km/h for long road trips as well.

One highway pull to 200km/h is a non issue.

[minn19]

Originally Posted by Fille

Nice... Remind me not to buy a car from you :P

Seriously. Redlining isn't catastrophic but it sure as hell isn't healthy either.

There is NO reason to redline an engine which makes peak power @5800 rpm and has a redline @7000 rpm. See what I mean?

Is there really that big of a difference in terms of engine wear between 5800-7000 rpm.

[minn19]

Originally Posted by nicknaz

OP, you have absolutely nothing to worry about. Many people do track days in their car, and that is 20-30 minutes per session of full throttle, high RPM driving. I'm sure some German forum members have left their car on cruise control at 200km/h for long road trips as well.

One highway pull to 200km/h is a non issue.

+1

OP, if you worried about one instance, than my car is ready for the crusher at 4500 miles. I don't think I beat on it, but I've definitely have had some fun with it. Why else buy a car like this?

[m6pwr]

Originally Posted by minn19

Is there really that big of a difference in terms of engine wear between 5800-7000 rpm.

No, but there's a pretty big difference in torque.

[m6pwr]

Originally Posted by minn19

Is there really that big of a difference in terms of engine wear between 5800-7000 rpm.

No, but there's a pretty big difference in torque, about 60 pound feet or more.

[nicknaz]

Originally Posted by m6pwr

My 335 with ZF 8 speed is on order so I don't have personal experience, but I wonder how the ecu is programmed in the auto sport or sport+ mode with your right foot planted, accelerating up through the gears? Is it redline or something less?

In sport+, with the gearbox in S mode, the computer will shift at the redline

If the gearbox is in "manual" mode, the engine will bounce off the fuel cutoff and hold the selected gear.

[minn19]

Originally Posted by m6pwr

No, but there's a pretty big difference in torque, about 60 pound feet or more.

Right, I get that, but we are not talking about optimal shift points. The poster seemed to infer there is more damage being done by revving it out to 7000 instead of short shifting at 5800. I was wondering if anybody had any real info on the that opinion.

[chiefneil]

Originally Posted by m6pwr

No, but there's a pretty big difference in torque, about 60 pound feet or more.

In an N20 or N55? The torque curve is pretty flat. The N20 makes 100% of it's torque between 3k - 4.5k rpm. It actually starts dropping off after 5k rpm. Even at 2k rpm it's making about 90% of it's torque (220 vs 250). The N55 is pretty similar.

If I had to offer an uneducated guess as to why there's high-rpm restrictions during break-in, it would be friction concerns. I believe the inside of the cylinder walls are lightly scored/textured to help with initial ring seating. That's why you usually get a little higher oil usage and lower gas mileage during break-in.

Think of it like sanding something delicate but rough, you want to start your power sander on low to medium, not crank it up to high immediately. You don't want the rings hammering away at the cylinder scoring too quickly as material is getting sanded away. The recommendation for varying rpm sorta makes sense in that context as well.

[ft1330]

Originally Posted by Fille

Nice... Remind me not to buy a car from you :P

Seriously. Redlining isn't catastrophic but it sure as hell isn't healthy either.

There is NO reason to redline an engine which makes peak power @5800 rpm and has a redline @7000 rpm. See what I mean?

When I floor it, and I have AT, I believe it goes all the way to red line. Why would the AT be programmed by BMW in a way that is "unhealthy" for the engine? And flooring a car is a pretty common occurrence.

[ft1330]

Originally Posted by m6pwr

I believe Fille is right. There's an old saying, "It's torque that gets you there, and it's horse power that keeps you there." It's torque that influences acceleration.

According to the torque curve for the N55 ( page 13 of the f30 training guide - http://f30.bimmerpost.com/forums/sho...d.php?t=858623), peak torque for the N55 is 300 foot pounds and the "curve" is dead flat all the way from 1200 to 5000 rpm. After 5000 rpm the torque falls off quickly - down to 240 foot pounds at 6500 rpm.

Most books on racing and high performance driving recommend shifting at or just after peak torque so that at the completion of the shift, the engine is in the fat part of the torque curve or just before peak torque. This gives you the best acceleration. Wind it out to the redline and at shift completion you'll be in the part of the torque curve that is already going south fast. All you're doing is beating up the engine.

My 335 with ZF 8 speed is on order so I don't have personal experience, but I wonder how the ecu is programmed in the auto sport or sport+ mode with your right foot planted, accelerating up through the gears? Is it redline or something less?

It's red line if you floor it in sport/sport+ (not even kickdown mode). It doesn't shift anywhere near 5k. I'm starting to think this AT sucks.

[m6pwr]

Originally Posted by ft1330

It's red line if you floor it in sport/sport+ (not even kickdown mode). It doesn't shift anywhere near 5k. I'm starting to think this AT sucks.

Thanks for the feedback. I trust in ZF and BMW, and I think the 8 speed is really slick. Remember too that the only tranny you can get in the BMW M235 Racing off-the-shelf race car is the ZF 8 speed. On reflection, maybe one reason BMW has the 8 speed wind to redline on shifts is because if it didn't the owner would immediately return the lemon for a refund. Also, I guess we need to keep in mind that the racing books I mentioned are geared toward the preparation and build of all out race cars with MT's, not production cars like the BMW.

To reiterate, here's what the book DRIVE TO WIN by Carroll Smith has to say on the subject:

"THE SHIFT POINT

Exactly the same parameters apply to the selection of the optimum rpm at which we should shift gears. This points to a couple of basic truths:

1) For maximum performance you always have to shift past the peak of the horsepower curve.

2) Depending on the shape of the curve and the gear splits, you don't have to go very far over the peak.

3) There is a point after which more rpm equates to less performance, not more."

On the other hand, there's the book GOING FASTER! MASTERING THE ART OF RACE DRIVING written by the staff of the Skip Barber Racing School. This book I think is more geared toward drivers of regular production cars like a BMW. With regard to shift points, the book says to forget about all the mumbo jumbo of optimum shift points and all the various gear splits; just keep you're right foot buried and shift at the redline.

So whether you've got the six speed or the ZF in sport manual with paddles, you can do whatever floats your boat.

[Fille]

Originally Posted by ft1330

When I floor it, and I have AT, I believe it goes all the way to red line. Why would the AT be programmed by BMW in a way that is "unhealthy" for the engine? And flooring a car is a pretty common occurrence.

If it does that then BMW have just been lazy when programming the AT for the driving modes. Just look at this picture and judge yourself. Maybe then you'll realize how dumb it is to redline...

[crono06]

OP, were you maintaining 120 in the left lane while everybody passed you? If that was the case, I can understand why some people would be upset.

The way I feel is that even if I'm going 120, 130, 140, whatever it may be, and I'm in the left lane, as soon as somebody comes up behind me, I should be moving to the right to let them go. The left lane is the fast/passing lane. Please don't be one of those people that feel entitled to drive in the left lane just because you're going over speed limit.

[Dan_335i]

Originally Posted by crono06

OP, were you maintaining 120 in the left lane while everybody passed you? If that was the case, I can understand why some people would be upset.

The way I feel is that even if I'm going 120, 130, 140, whatever it may be, and I'm in the left lane, as soon as somebody comes up behind me, I should be moving to the right to let them go. The left lane is the fast/passing lane. Please don't be one of those people that feel entitled to drive in the left lane just because you're going over speed limit.

I know

I see a lot of people stay in left lane while traveling slow. I get in front of them and left off the gas until i am at 60km ph. Then the guy honks or flashes high beams. Lol

[ft1330]

Originally Posted by Fille

If it does that then BMW have just been lazy when programming the AT for the driving modes. Just look at this picture and judge yourself. Maybe then you'll realize how dumb it is to redline...

Not sure why you're calling me dumb when it's not my fucking choice to shift at redline, but the AT's. Re-read my post and you'll see that I agree it should shift earlier when flooring it. Are you telling me I shouldn't floor it when trying to accelerate fast? Maybe you have a pedal stop behind your accelerator so it doesn't go to redline? lol... Oh no wait you have the 320d, do you even have a redline???

[InControl]

Surprised no one suggested this to you, CHANGE THE OIL!! premature break-in causes unnecessary friction between components, some junk, let's call it metallic flakes, can end up in the oil and if you don't flush-it may adversely affect the engine.

[E39hijinks]

No you did not ruin your car. You can run your engine to redline under full load for extended periods of time with the car fully weighed down under extremely hot weather. Basically you can do what you did x100. You came nowhere near harming your car. Not even the slightest whiff of the slighest hint. Silly concern.