Delayed acceleration in D mode
#1
Delayed acceleration in D mode
Hi all,
I am a happy owner of an XK 4.2 x150.
While I'm generally very happy with the driving experience, I have noticed that when I fully press the throttle in Drive mode, there is a 1 second waiting before the car starts to accelerate.
I'm not sure why this is happening, although I could imagine it's a safety measure, given the amount of acceleration which follows!
My questions are:
1. Can anyone confirm this is the normal behaviour of the automatic D mode?
2. Has anyone thought of and/or tried to modify the response, making it slightly quicker? I imagine that might be quite complicated though...
Thanks a lot in advance!
I am a happy owner of an XK 4.2 x150.
While I'm generally very happy with the driving experience, I have noticed that when I fully press the throttle in Drive mode, there is a 1 second waiting before the car starts to accelerate.
I'm not sure why this is happening, although I could imagine it's a safety measure, given the amount of acceleration which follows!
My questions are:
1. Can anyone confirm this is the normal behaviour of the automatic D mode?
2. Has anyone thought of and/or tried to modify the response, making it slightly quicker? I imagine that might be quite complicated though...
Thanks a lot in advance!
#2
Mine does it sometimes. Seems the engine and trans fight deciding what to do and I wait for the trans to downshift. Usually when I'm just loping along and it's about time to up shift and I nail it that it'll act up. Other times just blip the throttle and it downshifts and is gone. Blaming it on the ghost of Lucas.
You can train the car to react quicker by driving it more aggressively. It will adapt to your driving habits and down shift earlier in the throttle application vs. lug like it does when pap pap drives.
You can train the car to react quicker by driving it more aggressively. It will adapt to your driving habits and down shift earlier in the throttle application vs. lug like it does when pap pap drives.
#3
I was told that from a standstill, when the car is in either D or S mode, the transmission actually starts in 2nd gear - and that to start in 1st gear - you have to activate the paddle shifter and manually shift the transmission with the paddle out of 2nd gear and into 1st gear. Is that right or wrong? Thanks.
#4
I was told that from a standstill, when the car is in either D or S mode, the transmission actually starts in 2nd gear - and that to start in 1st gear - you have to activate the paddle shifter and manually shift the transmission with the paddle out of 2nd gear and into 1st gear. Is that right or wrong? Thanks.
If in sport manual mode, it won't automatically downshift to 1st but will start from second unless you downshift to first.
In drive, there can be a small amount of time from when you come to a stop to when it shifts to first.
When not in manual mode, as you come to a stop it likely is in second, but once at a stop it goes to first.
Because it makes the shift to first with the lowest RPM difference, you don't feel it that much.
#5
Hi all,
I am a happy owner of an XK 4.2 x150.
While I'm generally very happy with the driving experience, I have noticed that when I fully press the throttle in Drive mode, there is a 1 second waiting before the car starts to accelerate.
I'm not sure why this is happening, although I could imagine it's a safety measure, given the amount of acceleration which follows!
My questions are:
1. Can anyone confirm this is the normal behaviour of the automatic D mode?
2. Has anyone thought of and/or tried to modify the response, making it slightly quicker? I imagine that might be quite complicated though...
Thanks a lot in advance!
I am a happy owner of an XK 4.2 x150.
While I'm generally very happy with the driving experience, I have noticed that when I fully press the throttle in Drive mode, there is a 1 second waiting before the car starts to accelerate.
I'm not sure why this is happening, although I could imagine it's a safety measure, given the amount of acceleration which follows!
My questions are:
1. Can anyone confirm this is the normal behaviour of the automatic D mode?
2. Has anyone thought of and/or tried to modify the response, making it slightly quicker? I imagine that might be quite complicated though...
Thanks a lot in advance!
Because of how I drove with the paddles, my car is reluctant to downshift when I hit the go pedal. I wish I could have a peppier program in drive all the time instead of the "adaptive" program I get.
Do you still get this delay in sport mode?
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#9
I roll into the throttle to keep it from spinning so I don't think I've ever felt the car downshift to first.
Rode the bike to work yesterday, 43` or so and this morning just about rear ended a car in the slow lane as I was getting on the interstate because this thing accelerated so quickly. Car always starts in 2nd unless I put it in first. Even in sport I need to paddle shift it down to first. If not and I paddle shift up (once moving) it goes to 3rd, not 2nd.
Rode the bike to work yesterday, 43` or so and this morning just about rear ended a car in the slow lane as I was getting on the interstate because this thing accelerated so quickly. Car always starts in 2nd unless I put it in first. Even in sport I need to paddle shift it down to first. If not and I paddle shift up (once moving) it goes to 3rd, not 2nd.
#10
There's even a video in this forum of someone doing exactly this at a moderate acceleration, and there are five upshifts.
#11
#12
You have a weird car, sir.
I found that old post:
https://www.jaguarforums.com/forum/x...r-stop-144987/
I found that old post:
That was indeed me and you can see it here:
Gears - YouTube
I have also used SDD on my car with the display gear metric showing and was able to watch it drop in to 1st when the car came to a halt so for me there is no question that the 4.2L XKR's will generally drop in to first in 'D' when at a standstill.
I say generally because as Ngarara mentioned he was told by Jaguar that under certain circumstances it may pull away in 2nd but I certainly didn't witness that when I was playing.
Gears - YouTube
I have also used SDD on my car with the display gear metric showing and was able to watch it drop in to 1st when the car came to a halt so for me there is no question that the 4.2L XKR's will generally drop in to first in 'D' when at a standstill.
I say generally because as Ngarara mentioned he was told by Jaguar that under certain circumstances it may pull away in 2nd but I certainly didn't witness that when I was playing.
Last edited by Cee Jay; 12-20-2017 at 09:26 PM.
#13
The only way you can really tell is to use SDD to monitor which gear you are in. I did that on both my old '07 XKR and current '10 XKR so can 100% confirm that is the case, at least on those two cars anyway.
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