Login
![]() |
![]() |
![]() |
![]() |
12-22-2012, 02:44 PM | #1 |
Lieutenant
![]() ![]() ![]() 87
Rep 563
Posts |
what is this...?
when i down shift to 2nd at 50mph the rpm at 5000,this is normal, but this week i notice the rpm at 50mph on 2nd about 5500 what could be the problem
![]() ![]() also when i hit the throttle 1/4 or 1/2 then take off my feet, i feel vibration under the driver seat, what's the problem?? |
12-22-2012, 02:48 PM | #2 |
European Editor
![]() 7598
Rep 22,235
Posts |
clutch slipping would be my best guess...
__________________
|
Appreciate
0
|
12-22-2012, 02:54 PM | #3 |
Lieutenant
![]() ![]() ![]() 87
Rep 563
Posts |
|
Appreciate
0
|
12-22-2012, 03:01 PM | #4 |
Just one more taste...
![]() 32
Rep 1,421
Posts |
Rpm is independent of speed. The speed your car is moving at and what gear you are in will determine the rpm your engine will be running at.
Did you change to snow tires recently? Or change wheels at all? It wouldn't surprise me that a small difference in speed in 2nd gear would equate to 500rpm difference, say, 3-5mph may be 500rpm worth. |
Appreciate
0
|
12-22-2012, 05:48 PM | #5 | |
Lieutenant
![]() ![]() ![]() 87
Rep 563
Posts |
Quote:
|
|
Appreciate
0
|
12-22-2012, 06:35 PM | #8 | |
Lieutenant
![]() ![]() ![]() 87
Rep 563
Posts |
Quote:
![]() |
|
Appreciate
0
|
12-22-2012, 07:36 PM | #9 |
Just one more taste...
![]() 32
Rep 1,421
Posts |
Is it making any sound? Or are the RPMs just higher? Find a decent incline hill and do a few 2nd gear pulls up it. If your clutch is shot, your RPMs should shoot up.
|
Appreciate
0
|
12-23-2012, 10:07 AM | #10 |
First Lieutenant
![]() ![]() 52
Rep 314
Posts |
any other problems?
shifting up\down from\to second? kickdowns no hooking up?
__________________
135i N55 / KW V3 / JB4 S2 + MHD Flash / CP-E 5" DP / CP-E charge pipe / CP-E 7" FMIC / M3 Subframe Bushings / Powerflex Diff and rear shock mount bushes / M3 front control arms / M3 Rear control arms / MFactory LSD / KW 28mm front antiroll / Eibach rear 15mm bar
![]() |
Appreciate
0
|
12-24-2012, 06:16 AM | #12 |
Private First Class
![]() 12
Rep 111
Posts |
|
Appreciate
0
|
01-01-2013, 10:20 AM | #13 |
Private
![]() ![]() 25
Rep 66
Posts |
I wouldn't be dropping into 2nd at 50mph as frequently as it seems you do. That's a huge strain on your trans. Do a pull In second and third and watch your rpms. If they populate faster than normal it's obv your clutch. A worn clutch usually slips under acceleration, not normal load. --- normally--- that's case by case.
|
Appreciate
0
|
01-01-2013, 05:51 PM | #14 | |
Captain
![]() ![]() ![]() ![]() -104
Rep 644
Posts |
Quote:
If its auto it is my understanding it would rev match on downshift, theoretically this wouldn't cause any extra strain on the transmission. And by your logic any gear at 5000rpm would be equally damaging. Please explain.
__________________
BSM 2008 135i
-VRSF 7" IC -VRSF DP's -n55 mids -BERK race -ER CP -TIAL BOV -BMS DCI -JB4 G5 ISO -ST coils -STOPTECH slotted rotors & pads -SLeK lip Follow me on instagram: wescuddles |
|
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|