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  #1  
Old 07-27-2004, 12:04 AM
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swchang swchang is offline
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1st gear accel/decel jerky

Has anyone else noticed jerkiness in 1st gear? In particular, I can think of two scenarios. One is if you're on the throttle in first and then you suddenly let off. The car doesn't smoothly slow to a crawl. The second is if you're on the throttle, let go, then step on the gas again (e.g. rolling stop through a stop sign or before turning onto a street from a service road).

Any ideas if this is normal, and if it is, why it happens? DBW?
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  #2  
Old 07-27-2004, 12:17 AM
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FenPhen FenPhen is offline
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I dunno about DBW, but aren't all manual cars like this in first gear? I'd guess it's due to the high gear ratio, which effectively magnifies the gas pedal input you give.
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  #3  
Old 07-27-2004, 12:39 AM
dingfwen dingfwen is offline
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Yup. Totally normal. In first gear, your engine has the most mechanical advantage over your wheels and in sixth gear, it has the least. You can think of gears like a lot of interlocking levers with different lengths. What this means is that in first gear, your engine spinning up or down will greatly influence your wheels due to the mechanical advantage, thus the jerkiness when you lift/put down the gas. In sixth, the engine has much less influence over the wheels, so it is "dragged" along by your wheels and the mass of your car, resulting in smoother acceleration and deceleration.

In case none of that made any sense, check out how gear and transmissions work at:
http://www.howstuffworks.com. It's a great site!
  #4  
Old 07-27-2004, 04:20 AM
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shizat63 shizat63 is offline
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Yep, mine is exactly like that. Kinda like it spools up and the car gets really jerky. You gotta just learn to compensate when in 1st gear
  #5  
Old 07-27-2004, 05:49 AM
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Quote:
Originally Posted by shizat63
Yep, mine is exactly like that. Kinda like it spools up and the car gets really jerky. You gotta just learn to compensate when in 1st gear

Exactly. In fact the instant on/off nature of the throttle with a manual tranny is one of the things I love about it.
  #6  
Old 07-27-2004, 06:18 AM
andy_thomas andy_thomas is offline
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Quote:
Originally Posted by swchang
Has anyone else noticed jerkiness in 1st gear? In particular, I can think of two scenarios. One is if you're on the throttle in first and then you suddenly let off. The car doesn't smoothly slow to a crawl. The second is if you're on the throttle, let go, then step on the gas again (e.g. rolling stop through a stop sign or before turning onto a street from a service road).

Any ideas if this is normal, and if it is, why it happens? DBW?
It's because it's a manual, not an e-z-e-ride slushmagic (which, unless you lock it in first gear, freewheels when you take your foot of the gas). Also manuals tend to be lower-geared than autos, especially in first.
  #7  
Old 07-27-2004, 10:19 AM
Bigerr19 Bigerr19 is offline
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My old E36 328is used to do the same thing, even more noticable when the air-conditioning was on.
  #8  
Old 07-27-2004, 05:38 PM
richard richard is offline
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I think the Bimmer is pretty good compared to other cars. I can creep along in stop and go traffic in 1st without having to use the clutch unless I'm coming to a complete stop. It's not near as jerky as my girlfriend's Honda del Sol. Her car needs judicious clutch use even in 2nd gear when accelerating and decelerationg.
  #9  
Old 07-27-2004, 06:05 PM
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swchang swchang is offline
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Okay, I figured the jerky decel was due to the manual transmission. What really gets my goat is the jerkiness upon accelerating after decelerating. I'm surprised I don't get whiplash after each episode. Anyway, how do I avoid it? Just ease more gently onto the throttle? Any other ways?
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  #10  
Old 07-27-2004, 06:12 PM
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Quote:
Originally Posted by swchang
Anyway, how do I avoid it? Just ease more gently onto the throttle? Any other ways?
Yes. Ease on the throttle and it won't jerk. Or, go to second. (You don't need to tool around a parking lot in first gear all the time if you can safely bring your speed up to maybe 15-20 mph.)
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  #11  
Old 07-27-2004, 07:12 PM
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operknockity operknockity is offline
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I had those problems when I first got the bimmer. It was the difference between a very loose and sloppy 16 year old Toyota vs the brand new and very stiff bimmer clutch.

I did notice that after they installed the software fix for the idle stall problem that whatever remapping of the idle rpm's and throttle response has made 1st a touch more finicky than it was even when brand new.
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  #12  
Old 07-27-2004, 07:34 PM
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A Buick with an automatic would solve the problem nicely
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  #13  
Old 07-27-2004, 07:43 PM
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Quote:
Originally Posted by swchang
Okay, I figured the jerky decel was due to the manual transmission. What really gets my goat is the jerkiness upon accelerating after decelerating. I'm surprised I don't get whiplash after each episode. Anyway, how do I avoid it? Just ease more gently onto the throttle? Any other ways?
You could try getting out of the car and pushing it for a smoother acceleration...
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  #14  
Old 07-27-2004, 08:30 PM
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Quote:
Originally Posted by doeboy
You could try getting out of the car and pushing it for a smoother acceleration...
How about I pay you to ride with me and get out and push when I want smooth acceleration? My offer is this: I'll jab my finger into your stomach to hear you giggle "hehe!" with delight for each usage of your services.
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  #15  
Old 07-27-2004, 08:34 PM
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doeboy doeboy is offline
DHP pwns ZHP :p
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Quote:
Originally Posted by swchang
How about I pay you to ride with me and get out and push when I want smooth acceleration? My offer is this: I'll jab my finger into your stomach to hear you giggle "hehe!" with delight for each usage of your services.
How 'bout.... "NO"
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  #16  
Old 07-27-2004, 08:42 PM
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Quote:
Originally Posted by doeboy
How 'bout.... "NO"
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  #17  
Old 07-27-2004, 09:12 PM
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doeboy doeboy is offline
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Quote:
Originally Posted by swchang
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  #18  
Old 07-27-2004, 09:52 PM
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Fast Bob Fast Bob is online now
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In first gear, you have a torque-multiplication factor of about 12 1/2 times....this is analogous to having a thousand-watt lightbulb hooked up to a quarter-turn dimmer switch.
Once you learn to modulate that right foot, you`ll be OK.

Regards,
Bob
  #19  
Old 07-27-2004, 10:11 PM
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Just like everything in life, there are pro's and con's. It's all about what you have to put up with (or adapt to) to enjoy what you want.
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  #20  
Old 07-27-2004, 10:17 PM
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yup, 1st can be touchy like that.
the lower the gear the greater the effect of engine braking.

DBW doesnt help it any...
  #21  
Old 07-27-2004, 11:38 PM
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Bavarian Bavarian is offline
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LOL well I'm sure many of you will say that the Steptronic does not count as an example, however my Step 330i is VERY jerky in 1st gear (exactly the same symptoms as you described). And it's been that way since day 1. You just gotta learn to tame the beast once you learn when it likes to be jerky.
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  #22  
Old 07-28-2004, 01:11 AM
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I use the clutch alot to get my car moving smoothly. I just depress the clutch while slowing down and slip it while taking off slowly. This is probably wearing the crap outta my clutch, but at least my head won't be bobbling around.
  #23  
Old 07-28-2004, 01:40 AM
armaq armaq is offline
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My M3's 1st is butter smooth

Drove a 5spd IS300 for a while. In that car even 3rd is jerky "nod your head!"
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  #24  
Old 07-28-2004, 04:17 PM
Jspeed Jspeed is offline
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Is this your first manual tranny?

I just naturally learned to hit the clutch when I have to suddenly let off the gas in 1st gear. I think most experienced drivers do that b/c they know the car WILL be jerky otherwise.
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  #25  
Old 07-28-2004, 04:51 PM
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operknockity operknockity is offline
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Quote:
Originally Posted by armaq
Drove a 5spd IS300 for a while. In that car even 3rd is jerky "nod your head!"
When I test drove one of those, I found the clutch to be very very stiff and the gas pedal to be very very soft (almost to the point where a feather would floor it), so I was constantly missing shifts in every gear and bucking down the road something fierce. Don't know whether that was just the one car they had available for test drives or it was just the way they made 'em. Never drove another one because I decided that the car was just too small, and the Sport Cross version, which I was more interested in than the sedan, was not available with a stick.
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Last edited by operknockity; 07-28-2004 at 09:59 PM.
 

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