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      05-03-2013, 02:11 PM   #1
Boogalu
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accidental red line

hey guys so I was driving around the other day and I wanted to play with my paddle shifters. . so while coming from an on ramp I forgot that I was in manual mode and floored the gas pedal and I didn't shift right away so it went into the red line for about 3 seconds.

that's not bad is it?

I was told by a mechanic who works at bmw that they red line each gear to make sure the engine is without malfunction, but then again.. he's just a mechanic haha

any opinions??

thanks
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      05-03-2013, 02:13 PM   #2
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Ummm, you have a rev limiter. You shouldn't have any issues. Especially with an automatic box. Downshifts are the bigger concern - but only if you have an manual.
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      05-03-2013, 02:21 PM   #3
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You should be just fine. I did the same thing years ago with a manual transmission - hit the red and was in it for a few seconds. I wouldn't worry about it.
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      05-03-2013, 02:25 PM   #4
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Can we have a sticky at the top of this forum that tells everyone with slushboxes not to worry, the computer won't let you hurt your car?
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      05-03-2013, 04:07 PM   #5
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Quote:
Originally Posted by rconti View Post
Can we have a sticky at the top of this forum that tells everyone with slushboxes not to worry, the computer won't let you hurt your car?
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      05-03-2013, 04:50 PM   #6
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I think you should be fine.

I did the same thing yesterday on the highway.
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      05-03-2013, 05:00 PM   #7
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      05-03-2013, 05:15 PM   #8
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You'll know you've done some damage when a valve pops out through the bonnet

Ah, the good old days of valve bounce.

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      05-03-2013, 05:16 PM   #9
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Quote:
Originally Posted by rconti View Post
Can we have a sticky at the top of this forum that tells everyone with slushboxes not to worry, the computer won't let you hurt your car?
dunno why it's a slushbox. I care about my car just as much as the next guy. I'm just a 24 year old kid who made a mistake. but thanks for your contribution
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      05-03-2013, 05:17 PM   #10
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thanks for everyone else's help!! much appreciated!!!
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      05-03-2013, 05:43 PM   #11
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Quote:
Originally Posted by Boogalu View Post
dunno why it's a slushbox. I care about my car just as much as the next guy. I'm just a 24 year old kid who made a mistake. but thanks for your contribution
"Slush box" is not a derogatory term mate.

It is an old fashioned slang term for an automatic gear box. In times gone by the shifting on these boxes was quite vague, hence the name.

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      05-03-2013, 05:47 PM   #12
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Even with a manual it would be pretty hard to cause any kind of noticeable damage to a car just from redlining it for a brief moment. That's why they have rev limiters
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      05-03-2013, 05:52 PM   #13
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the slush-box term definitely needs some modernizing- these things shift QUICK, esp the DCTs out there

Also, for those of you saying that a short red line is not dangerous, its not for a brief period.

But i bet if you red line the car for like 2min straight (huge exaggeration) i could bet you something will break in the car, unless the car just shuts itself off.
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      05-03-2013, 10:31 PM   #14
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Nothing will happen to it, your engine can go faster than the actual rev limiter allows it to go, thats why its there to stupid-proof the car ( no offense ) redline it for more than 5 minutes and it will overheat, causing it to go to limp mode. Preventing any real damage to be done.

It has so many failsafes onboard... Ever tried flooring it with a cold engine? It just wont go.

What i would be careful about though is letting the car put itslef into park by driving with the door open.. Its like an over-engineered suicide for the trans.
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      05-03-2013, 10:42 PM   #15
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Quote:
Originally Posted by Boogalu View Post
dunno why it's a slushbox. I care about my car just as much as the next guy. I'm just a 24 year old kid who made a mistake. but thanks for your contribution
It's a "slushbox" because its an automatic transmission with a torque converter.
Caring about your car is good.
You didn't make a mistake.
He was suggesting the sticky because this same question has been asked several times before, and is therefore by definition an FAQ.
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      05-04-2013, 07:08 AM   #16
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Quote:
Originally Posted by Koer View Post
What i would be careful about though is letting the car put itslef into park by driving with the door open.. Its like an over-engineered suicide for the trans.
Can you elaborate on this? What is this feature about?
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      05-04-2013, 11:27 AM   #17
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Quote:
Originally Posted by ft1338

Can you elaborate on this? What is this feature about?
Sure,

Open your door, put the car on drive or reverse, let go of the brake. At approx 5 km/h your transmission will think your car is actually running on its own and that you are outside the car, thus putting itself in anti-rollout mode, aka "Parking" brining it to a harsh stop.

No brakes, just the transmission taking your 1.3 ton car into full stop by crushing two pieces of metal together.

THIS is what i meant by over-engineered suicide.
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      05-04-2013, 05:40 PM   #18
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Quote:
Originally Posted by Boogalu View Post
hey guys so I was driving around the other day and I wanted to play with my paddle shifters. . so while coming from an on ramp I forgot that I was in manual mode and floored the gas pedal and I didn't shift right away so it went into the red line for about 3 seconds.

that's not bad is it?

I was told by a mechanic who works at bmw that they red line each gear to make sure the engine is without malfunction, but then again.. he's just a mechanic haha

any opinions??

thanks
AS others have stated, your car is fine.
With an automatic trans the computer will not allow you to shift into a gear that will cause your engine to 'over rev', meaning go beyond it's rev limit.
You are protected even when downshifting in manual mode.
For example, if your engine is near red line and you accidentally down shifted the computer will not allow the shift.
Also, every engine is equipped with an electronic 'rev limiter', which will stop the engine from accelerating beyond it's mechanical limit.
The engines mechanical limit is actually higher than it's electronically controlled rev limit or "red line". The computer can cut either spark or fuel or both to stop the engine from accelerating beyond it's limit.

With a manual trans if you accidentally downshifted while near red line, then you would have a mechanically caused over rev where the cars momentum will cause the engine to rev beyond it's mechanical limits.
The electronic rev limiter can't help you in that scenario because in that case the engine is not accelerating due to normal combustion, it i being accelerated by the cars momentum.
This is lovingly called a "money shift", as it will cost a lot of money to fix the engine
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      05-04-2013, 07:42 PM   #19
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Unless your engine was cold (your oil temp not at or near the 12 o'clock position) then your fine. If anything I know people that swear by the fact that BMW's need an occasional italian tune-up. And if it was cold when you did it, it would be pretty obvious. Because you wouldn't be asking if it hurt your engine, you would be bitching about BMW labor costs. LOL
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      05-05-2013, 07:44 AM   #20
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change your engine. simple.
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      05-05-2013, 08:16 PM   #21
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Quote:
Originally Posted by Koer View Post
Open your door, put the car on drive or reverse, let go of the brake. At approx 5 km/h your transmission will think your car is actually running on its own and that you are outside the car, thus putting itself in anti-rollout mode, aka "Parking" brining it to a harsh stop.
Ah. I saw this happen to an F30 at a car control clinic I was instructing this past weekend, and it slammed to a stop so abruptly, I assumed it was the car doing the braking and not the guy behind the wheel slamming on the breaks.

I didn't realize it threw itself into park -- that's even worse!

Though with these fancy new 8spd autos, what do I know, maybe if they design this "feature" they also design the parking pawl to handle it.
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      05-05-2013, 09:03 PM   #22
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Quote:
Originally Posted by rconti View Post
Ah. I saw this happen to an F30 at a car control clinic I was instructing this past weekend, and it slammed to a stop so abruptly, I assumed it was the car doing the braking and not the guy behind the wheel slamming on the breaks.

I didn't realize it threw itself into park -- that's even worse!

Though with these fancy new 8spd autos, what do I know, maybe if they design this "feature" they also design the parking pawl to handle it.
Wow. How in the world did BMW overlook that insane item?

How fast was the car going when it did this?
Who opened the door and why?
Did it feel like the car was auto braking, and then when stopped it put itself in park? Or did it really just slam into Park?
Is the trans still working along with the parking pawl?
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