F30POST
F30POST
2012-2015 BMW 3-Series and 4-Series Forum
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read
BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > accidental red line
Post Reply
 
Thread Tools Search this Thread
      05-03-2013, 02:11 PM   #1
Boogalu
Enlisted Member
 
Drives: 328i
Join Date: Apr 2013
Location: United States

Posts: 46
iTrader: (0)

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
Boogalu is offline  
0
Reply With Quote
      05-03-2013, 02:13 PM   #2
BavarianFanatic
Too much is never enough
 
Drives: Too Many
Join Date: Mar 2008
Location: SE PA

Posts: 1,700
iTrader: (0)

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.
BavarianFanatic is offline   United_States
0
Reply With Quote
      05-03-2013, 02:21 PM   #3
itwasepic
Private
 
Drives: 335i
Join Date: Apr 2010
Location: The North

Posts: 89
iTrader: (0)

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.
itwasepic is offline   United_States
0
Reply With Quote
      05-03-2013, 02:25 PM   #4
rconti
Lieutenant
 
Drives: Z3 M Coupe, NB Miata
Join Date: Apr 2012
Location: SF Bay

Posts: 515
iTrader: (0)

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?
rconti is offline  
0
Reply With Quote
      05-03-2013, 04:07 PM   #5
doublevanosrc
Loves Runflats.
 
doublevanosrc's Avatar
 
Drives: 2013 VW GTi
Join Date: Jul 2009
Location: Austin. Tx

Posts: 1,860
iTrader: (1)

Garage List
2011 BMW  [0.00]
2011 BMW  [0.00]
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?
__________________
2011 135i M Sport
Gone and missed
doublevanosrc is offline   United_States
0
Reply With Quote
      05-03-2013, 04:50 PM   #6
pallymore
First Lieutenant
 
Drives: 335xi M Sport
Join Date: Jan 2013
Location: Boston, MA

Posts: 313
iTrader: (0)

Garage List
I think you should be fine.

I did the same thing yesterday on the highway.
__________________
2013 F30 335i xDrive M Sport Line

pallymore is offline  
0
Reply With Quote
      05-03-2013, 05:00 PM   #7
NOKAOI F30
Private First Class
 
Drives: 2012 AW F30 335I
Join Date: Sep 2012
Location: SoCal, Huntington Beach

Posts: 103
iTrader: (0)

Quote:
Originally Posted by doublevanosrc View Post
NOKAOI F30 is offline  
0
Reply With Quote
      05-03-2013, 05:15 PM   #8
HFW003
Major
 
HFW003's Avatar
 
Drives: Havana 328 Modern Line
Join Date: Apr 2013
Location: Newcastle, Australia

Posts: 1,141
iTrader: (0)

You'll know you've done some damage when a valve pops out through the bonnet

Ah, the good old days of valve bounce.

H
__________________
2013 Havana 328 Modern Line with Xenons,HK stereo, Sports seats, Sunroof, Pro Nav, VSS, adaptive suspension, 19" 401's and other bits and pieces.
HFW003 is offline   Australia
0
Reply With Quote
      05-03-2013, 05:16 PM   #9
Boogalu
Enlisted Member
 
Drives: 328i
Join Date: Apr 2013
Location: United States

Posts: 46
iTrader: (0)

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
Boogalu is offline  
0
Reply With Quote
      05-03-2013, 05:17 PM   #10
Boogalu
Enlisted Member
 
Drives: 328i
Join Date: Apr 2013
Location: United States

Posts: 46
iTrader: (0)

thanks for everyone else's help!! much appreciated!!!
Boogalu is offline  
0
Reply With Quote
      05-03-2013, 05:43 PM   #11
HFW003
Major
 
HFW003's Avatar
 
Drives: Havana 328 Modern Line
Join Date: Apr 2013
Location: Newcastle, Australia

Posts: 1,141
iTrader: (0)

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.

H
__________________
2013 Havana 328 Modern Line with Xenons,HK stereo, Sports seats, Sunroof, Pro Nav, VSS, adaptive suspension, 19" 401's and other bits and pieces.
HFW003 is offline   Australia
0
Reply With Quote
      05-03-2013, 05:47 PM   #12
dreamspeed
Major
 
dreamspeed's Avatar
 
Drives: 6MT
Join Date: Jul 2012
Location: Los Angeles

Posts: 1,036
iTrader: (0)

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
__________________
dreamspeed is offline   United_States
0
Reply With Quote
      05-03-2013, 05:52 PM   #13
infinitigor
Captain
 
Drives: 13' 335i
Join Date: Mar 2010
Location: NYC

Posts: 856
iTrader: (8)

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.
infinitigor is offline  
0
Reply With Quote
      05-03-2013, 10:31 PM   #14
Koer
Private First Class
 
Drives: 335i 2012 luxury line white
Join Date: Aug 2012
Location: Mexico

Posts: 141
iTrader: (0)

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.
Koer is offline  
0
Reply With Quote
      05-03-2013, 10:42 PM   #15
elistan
First Lieutenant
 
Drives: F30 328i, AP1 S2000
Join Date: Sep 2012
Location: Longmont, CO

Posts: 315
iTrader: (0)

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.
elistan is offline   United_States
0
Reply With Quote
      05-04-2013, 07:08 AM   #16
ft1338
Second Lieutenant
 
Drives: None
Join Date: Feb 2013
Location: None

Posts: 226
iTrader: (0)

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?
ft1338 is offline  
0
Reply With Quote
      05-04-2013, 11:27 AM   #17
Koer
Private First Class
 
Drives: 335i 2012 luxury line white
Join Date: Aug 2012
Location: Mexico

Posts: 141
iTrader: (0)

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.
Koer is offline  
0
Reply With Quote
      05-04-2013, 05:40 PM   #18
RPM90
Major General
 
Drives: 335i Msport w/sport AT
Join Date: Mar 2006
Location: Chicago

Posts: 6,095
iTrader: (1)

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
RPM90 is offline  
0
Reply With Quote
      05-04-2013, 07:42 PM   #19
bimmerjph
Lieutenant Colonel
 
bimmerjph's Avatar
 
Drives: 2002 BMW 325i
Join Date: Oct 2011
Location: Tennessee

Posts: 1,964
iTrader: (0)

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
bimmerjph is offline   United_States
0
Reply With Quote
      05-05-2013, 07:44 AM   #20
kevlartoronto
Private First Class
 
Drives: a4 3.2L avant 6spd
Join Date: Mar 2012
Location: toronto

Posts: 131
iTrader: (0)

change your engine. simple.
kevlartoronto is offline  
0
Reply With Quote
      05-05-2013, 08:16 PM   #21
rconti
Lieutenant
 
Drives: Z3 M Coupe, NB Miata
Join Date: Apr 2012
Location: SF Bay

Posts: 515
iTrader: (0)

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.
rconti is offline  
0
Reply With Quote
      05-05-2013, 09:03 PM   #22
RPM90
Major General
 
Drives: 335i Msport w/sport AT
Join Date: Mar 2006
Location: Chicago

Posts: 6,095
iTrader: (1)

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?
RPM90 is offline  
0
Reply With Quote
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 10:56 PM.




f30post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST