advise for 520i
- Thread starter keki
- Start date
calvin_lin
Well-Known Member
Re: advise for 520i
Just collected the car yesterday.
I find that the gearbox has this weird jerk when slowing down. It is like the car has very strong engine brake in 10-30km/hr region. A few questions...
Say normal cruise at 60km/hr, then from far you see the light turn red, you release the accelerator, the engine brake starts to kick in.
1. It is like you totally can't coast in "free" at all. Release the accelerator pedal and the car starts to apply its brake, perhaps kinda like a hybrid. Does your car coast freely when you release the accelerator?
2. As you slow down, the gearbox will start to shift gear, until around 20-30km/hr, then there will be this pretty violent and jerky downshift, kinda like in a manual car downshifting for engine brake by a newbie driver who still need a lot of clutch work/rev match practise. Very obvious when slowing down for traffic light. Normal? No right?
Acceleration gear change is very smooth though...
Just collected the car yesterday.
I find that the gearbox has this weird jerk when slowing down. It is like the car has very strong engine brake in 10-30km/hr region. A few questions...
Say normal cruise at 60km/hr, then from far you see the light turn red, you release the accelerator, the engine brake starts to kick in.
1. It is like you totally can't coast in "free" at all. Release the accelerator pedal and the car starts to apply its brake, perhaps kinda like a hybrid. Does your car coast freely when you release the accelerator?
2. As you slow down, the gearbox will start to shift gear, until around 20-30km/hr, then there will be this pretty violent and jerky downshift, kinda like in a manual car downshifting for engine brake by a newbie driver who still need a lot of clutch work/rev match practise. Very obvious when slowing down for traffic light. Normal? No right?
Acceleration gear change is very smooth though...
wobbles
Well-Known Member
Re: advise for 520i
Ok, mine is an F13, but it has the same 8 speed ZF auto tranny. And NO, it does NOT jerk the way you mentioned. There is a very slight engine braking effect, especially obvious when coasting, and when the Efficiency Dynamics is recharging the car battery, but no outright jerking.
Might have something to this being a brand new car - mine already has 1200km on the clock - and that the ECU needs time to 'adapt' to your driving style. I recommend running in the car on 'crawl' mode ie Eco Pro mode (minus the irritating start stop) for about 1000km or so, then BOV, WOT to clear carbon, and then see if the jerking persists? If it does, you may need to get the software looked at.
calvin_lin;810823 said:
Ok, mine is an F13, but it has the same 8 speed ZF auto tranny. And NO, it does NOT jerk the way you mentioned. There is a very slight engine braking effect, especially obvious when coasting, and when the Efficiency Dynamics is recharging the car battery, but no outright jerking.
Might have something to this being a brand new car - mine already has 1200km on the clock - and that the ECU needs time to 'adapt' to your driving style. I recommend running in the car on 'crawl' mode ie Eco Pro mode (minus the irritating start stop) for about 1000km or so, then BOV, WOT to clear carbon, and then see if the jerking persists? If it does, you may need to get the software looked at.
Re: advise for 520i
The new F10 has the BER (brake energy regeneration), so you might be feeling that effect.
There are some that are having jerkiness with the gearbox. Check out this thread:
http://www.bmw-sg.com/forums/5-series-owners/54561-f10-jerky-start-low-gear.html
Just surprised that the latest batch also have gearbox issues.
calvin_lin;810823 said:
The new F10 has the BER (brake energy regeneration), so you might be feeling that effect.
There are some that are having jerkiness with the gearbox. Check out this thread:
http://www.bmw-sg.com/forums/5-series-owners/54561-f10-jerky-start-low-gear.html
Just surprised that the latest batch also have gearbox issues.
calvin_lin
Well-Known Member
Re: advise for 520i
The problem is that it is very smooth on acceleration, just the coasting part is very jerky and losing a lot of speed very fast. It is like don't even need to step on brake much for the car to slow down...I don't know how to describe it, except it feels a bit like a manual car.
I have never driven a bmw before, but say you are at 40km/hr and release the pedal to coast to traffic light on a quiet morning...Does the car slow down more like:
1. a manual car in 3rd gear, then down shift to 2nd gear...you know just only need a little brake to stop on a lazy morning when you don't have to rush in front to close the gap between you and the car in front...
2.a manual car in 4th gear, doesn't really shift down at all, you just apply the brake to come to a stop.
Is yours more like case 1 or 2?
The problem is that it is very smooth on acceleration, just the coasting part is very jerky and losing a lot of speed very fast. It is like don't even need to step on brake much for the car to slow down...I don't know how to describe it, except it feels a bit like a manual car.
I have never driven a bmw before, but say you are at 40km/hr and release the pedal to coast to traffic light on a quiet morning...Does the car slow down more like:
1. a manual car in 3rd gear, then down shift to 2nd gear...you know just only need a little brake to stop on a lazy morning when you don't have to rush in front to close the gap between you and the car in front...
2.a manual car in 4th gear, doesn't really shift down at all, you just apply the brake to come to a stop.
Is yours more like case 1 or 2?
Re: advise for 520i
tats for sure...i tried already..quite shiok...hahaha
but at least in comfort mode we shld not feel this kind of respond (at least i dun feel it in my previous jap car which was a FD1A). i almost got into accident twice when i try to cut out into the next lane as i want to go straight but the lane i was in was straight and right turn. i see my side mirror there is car coming but was quite a distance. but when i step the accelerator the car NO respond for abt 1sec then suddently the engine rev up..by then the car was already so near me causing the other car to jam brake (fyi, i never even step hard on the throttle).
sometimes i dunno when the car will listen to my right foot. even now during stationary moving off, when i step the accelerator the car dun respond or sometimes jerky start off just like riding horse and when u step the accelerator harder the car like wanna die off. but after after abt 30km/h car will be normal. only happen sometimes not frequent but dun think we can accept this on a car whose price which is almost equilvalent to a new 3rom HDB flat.
fyi, i send into PML, they tell me car no problem. i suspect they took my car out to rev like no body business then in the late evening i go test car with technical manager, the car is smooth. i also test drive the demo 520. its even smoother coz i believe evey one test drive will keep their rpm almost till redline...
Rocky99;811104 said:
tats for sure...i tried already..quite shiok...hahaha
but at least in comfort mode we shld not feel this kind of respond (at least i dun feel it in my previous jap car which was a FD1A). i almost got into accident twice when i try to cut out into the next lane as i want to go straight but the lane i was in was straight and right turn. i see my side mirror there is car coming but was quite a distance. but when i step the accelerator the car NO respond for abt 1sec then suddently the engine rev up..by then the car was already so near me causing the other car to jam brake (fyi, i never even step hard on the throttle).
sometimes i dunno when the car will listen to my right foot. even now during stationary moving off, when i step the accelerator the car dun respond or sometimes jerky start off just like riding horse and when u step the accelerator harder the car like wanna die off. but after after abt 30km/h car will be normal. only happen sometimes not frequent but dun think we can accept this on a car whose price which is almost equilvalent to a new 3rom HDB flat.
fyi, i send into PML, they tell me car no problem. i suspect they took my car out to rev like no body business then in the late evening i go test car with technical manager, the car is smooth. i also test drive the demo 520. its even smoother coz i believe evey one test drive will keep their rpm almost till redline...
Re: advise for 520i
my previous E90 320 and E89 Z4 2.5l also had this 1 sec lag thing which can be quite annoying esp when i try and overtake others on the expressway. it's hard to predict when the power will kick in, in order to overtake at the right moment.
those 2 cars didn't have sports mode, so the way to get around it was using a sprint booster which made the engine much more responsive and predictable.
i suppose this is the way the throttle response is designed to be, not because they are really that underpowered.
my previous E90 320 and E89 Z4 2.5l also had this 1 sec lag thing which can be quite annoying esp when i try and overtake others on the expressway. it's hard to predict when the power will kick in, in order to overtake at the right moment.
those 2 cars didn't have sports mode, so the way to get around it was using a sprint booster which made the engine much more responsive and predictable.
i suppose this is the way the throttle response is designed to be, not because they are really that underpowered.
calvin_lin
Well-Known Member
Re: advise for 520i
Too poor to afford strawberry...
golilok;810969 said:
Too poor to afford strawberry...
