Throttle lag at < 3mph - BMW Luxury Touring Community
 
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post #1 of 12 Old Apr 28th, 2014, 10:53 am Thread Starter
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Throttle lag at < 3mph

From a stop and/or at walking speed, the throttle response seems to be a little slow. I can't really describe it in terms of time or grip position, but I notice it most when I'm trying to do a tight u-turn or when doing a slow turn. In those cases when I only want a little gas, but I want it right now, I often don't get enough gas fast enough. Is that normal? Other bikes I have ridden have had much twitchier throttles and going over bumps sometimes would result in giving it a little blip. Is this "lag" normal? Is there a way to decrease it at all? Do I just have to practice more to figure out where the dead-space is when first applying the throttle?

Thanks for your input/feedback.

Chris W

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post #2 of 12 Old Apr 28th, 2014, 11:15 am
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Re: Throttle lag at < 3mph

Depends upon your rpms.

If you're coming from an HD it will take you time to get used to the LT.

Just look at the red line on the LT, yup its got a rev limiter. You can easily run her around 5K on twisty roads, crank her up and then cut her back before corners.

So, run your LT at higher rpms than you are used to with an HD

Bob

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post #3 of 12 Old Apr 28th, 2014, 11:26 am
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Re: Throttle lag at < 3mph

Sounds to me like your throttle cables need adjusted.

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post #4 of 12 Old Apr 28th, 2014, 1:26 pm
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Re: Throttle lag at < 3mph

Sounds to me like You're lugging the engine.
Use the clutch at low speeds like <3 mph (switch between coast & throttle engagement).

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post #5 of 12 Old Apr 28th, 2014, 1:54 pm Thread Starter
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Re: Throttle lag at < 3mph

Quote:
Originally Posted by BecketMa View Post
Depends upon your rpms.
This is only an issue for me at 3mph or less.

Quote:
Originally Posted by messenger13_ver2 View Post
Sounds to me like your throttle cables need adjusted.
Been looking through the threads on throttle cable adjustment. From what I can tell, there is an adjuster for one of the cables at the grip end and for both cables at the other end. Not looking forward to digging in that deep unless I know for sure I need to adjust them on that end. I don't know how to determine this. I have a Clymers at home. I'll take a look at that when I go home.


Quote:
Originally Posted by rhawk View Post
Sounds to me like You're lugging the engine.
Use the clutch at low speeds like <3 mph (switch between coast & throttle engagement).
I neglected to mention that I'm in first gear and in the friction zone. Combination of off/on clutch and off/on throttle. My complaint is when going from off or low throttle to more throttle, there's a perceptible lag between the time the grip turns and the time the engine responds.

Chris W

Current
'14 K1600 GTL

Previous
'09 HD Fat Bob
'07 K1200 LT (gf misses it)
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post #6 of 12 Old Apr 28th, 2014, 2:57 pm
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Re: Throttle lag at < 3mph

The only adjusters are at the grip and you want 1 to 1.5 mm of free play with a warm engine on both cables (one opens and the other closes). There is some slop but it should not slow you down. When doing slow work best to keep a fixed throttle rev (below 1500 rpm) and adjust power with the clutch and light rear brake only. That is just the way the LT is.

John
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post #7 of 12 Old Apr 28th, 2014, 6:45 pm Thread Starter
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Re: Throttle lag at < 3mph

Thanks John - I'll take a look and keep your suggestion in mind.

Chris W

Current
'14 K1600 GTL

Previous
'09 HD Fat Bob
'07 K1200 LT (gf misses it)
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post #8 of 12 Old Apr 28th, 2014, 8:42 pm
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Re: Throttle lag at < 3mph

Quote:
Originally Posted by cwarren View Post
From a stop and/or at walking speed, the throttle response seems to be a little slow. I can't really describe it in terms of time or grip position, but I notice it most when I'm trying to do a tight u-turn or when doing a slow turn. In those cases when I only want a little gas, but I want it right now, I often don't get enough gas fast enough. Is that normal? Other bikes I have ridden have had much twitchier throttles and going over bumps sometimes would result in giving it a little blip. Is this "lag" normal? Is there a way to decrease it at all? Do I just have to practice more to figure out where the dead-space is when first applying the throttle?

Thanks for your input/feedback.
My LT idles at 7 MPH in first gear. If you are really riding at 3 MPH, and aren't slipping the clutch, it is a wonder you have any throttle respond at all as that would be less than 500 RPM!

Hold a steady RPM and slip the clutch when making tight low speed turns.

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post #9 of 12 Old Apr 29th, 2014, 8:58 am Thread Starter
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Re: Throttle lag at < 3mph

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Originally Posted by Voyager View Post
My LT idles at 7 MPH in first gear. If you are really riding at 3 MPH, and aren't slipping the clutch, it is a wonder you have any throttle respond at all as that would be less than 500 RPM!

Hold a steady RPM and slip the clutch when making tight low speed turns.
I could have my facts wrong (wouldn't be the first time), but I believe now that what I should be doing is as you suggested. Sometimes I end up coasting (closed throttle) into a slow speed turn. Is that completely stupid? I'm thinking specifically of coming out of my townhome complex which is a series of about 5 mostly blind 90-deg turns with short straight stretches in between. Cars could be coming from many locations so I tend to stay pretty slow. After writing this, it seems the most immediate fix is to not coast into the slow turns, but when I do it, I always think "I'd be happier right now if my throttle was more responsive."

Thanks for the feedback.

Chris W

Current
'14 K1600 GTL

Previous
'09 HD Fat Bob
'07 K1200 LT (gf misses it)
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post #10 of 12 Old Apr 29th, 2014, 9:31 am
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Re: Throttle lag at < 3mph

Went for a ride yesterday & didn't notice the off idle issue.
I can blip the engine from closed throttle with no noticeable rpm hesitation.
I wonder if your idle rpm is low.... Mine idles at 1000 to 1200 rpm.

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post #11 of 12 Old Apr 29th, 2014, 11:16 am Thread Starter
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Re: Throttle lag at < 3mph

Quote:
Originally Posted by rhawk View Post
Went for a ride yesterday & didn't notice the off idle issue.
I can blip the engine from closed throttle with no noticeable rpm hesitation.
I wonder if your idle rpm is low.... Mine idles at 1000 to 1200 rpm.
I remember seeing mine usually at 800-1000. I can't say for sure if it ever is higher, but if it is it's not often enough for me to register it. I'd say most often I see it at 1000.

Chris W

Current
'14 K1600 GTL

Previous
'09 HD Fat Bob
'07 K1200 LT (gf misses it)
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post #12 of 12 Old Apr 29th, 2014, 11:21 am
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Re: Throttle lag at < 3mph

Quote:
Originally Posted by cwarren View Post
I remember seeing mine usually at 800-1000. I can't say for sure if it ever is higher, but if it is it's not often enough for me to register it. I'd say most often I see it at 1000.
Mine idles at 1,000 also with a dip to 950 every now and then. Idling on the level is 7.2 to 7.4 on the GPS. No way to go much slower with the clutch engaged.

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