I don't need to go 225 MPH, lower gears maybe?
#22
03-27-2015, 10:25 AM
Are you sure? From experience with the XK, people get confused because in manual mode the car will automatically drop to 2nd when you come to a halt, rather than 1st if you don't touch the paddles. It will then pull away in 2nd so they assume it always does.
In auto mode though the XK actually always pulls away in 1st so I wouldn't be surprised if the F-Type does as well. I recorded a video of my 07 XKR to demonstrate it and have also plugged in my SDD and watched the gear changes so I know for certain mine does.
The documentation I can find for the F-Type implies that it only pulls away in 2nd in snow mode.
The documentation for the Dynamic Launch mode on the F-Type says to put it in D or S as part of the process and explains that in Dynamic Launch the engine’s torque is not lowered during the gear change compared to sports mode.
"This delivers maximum through-gear vehicle acceleration, through 1st and 2nd and then through 3rd and 4th gear changes. This allows the car to accelerate more quickly than when in ‘conventional’ Sport Mode."
0.3 seconds quicker apparently but that shows that in D or S it will use 1st gear. Under light acceleration it will change from 1st to 2nd very quickly so may feel like it pulls away in 2nd.
In auto mode though the XK actually always pulls away in 1st so I wouldn't be surprised if the F-Type does as well. I recorded a video of my 07 XKR to demonstrate it and have also plugged in my SDD and watched the gear changes so I know for certain mine does.
The documentation I can find for the F-Type implies that it only pulls away in 2nd in snow mode.
The documentation for the Dynamic Launch mode on the F-Type says to put it in D or S as part of the process and explains that in Dynamic Launch the engine’s torque is not lowered during the gear change compared to sports mode.
"This delivers maximum through-gear vehicle acceleration, through 1st and 2nd and then through 3rd and 4th gear changes. This allows the car to accelerate more quickly than when in ‘conventional’ Sport Mode."
0.3 seconds quicker apparently but that shows that in D or S it will use 1st gear. Under light acceleration it will change from 1st to 2nd very quickly so may feel like it pulls away in 2nd.
#23
03-27-2015, 06:19 PM
Veteran Member
I checked mine, and under acceleration in 'D' from rest up to highway speed, it changed gear 5 times. That means it used all 6 gears, so it must have started in 1st.
However, I think the real answer is: it depends. I specifically asked Jaguar:
Their response:
So, basically, the TCM will decide what gear to start from depending on how hard you stand on the throttle.
However, I think the real answer is: it depends. I specifically asked Jaguar:
In 'D' mode, does an XK/XKR normally select 2nd gear when accelerating moderately (i.e. not full throttle) from a standstill?
This can happen depending on how enthusiastic the driver is, This is to provide better torque and acceleration.
#24
03-27-2015, 08:45 PM
#25
03-28-2015, 03:41 AM
Veteran Member
#26
03-28-2015, 04:25 AM
#28
03-28-2015, 06:32 AM
Veteran Member
The 8-speed will have a different set of TCM logic & maps. Interestingly, I was told by a ZF transmission specialist that the 8-speed doesn't confer any major performance benefit, but it helps fuel economy. That would fit with it starting in 2nd unless you really need some stump-pulling torque.
#29
03-28-2015, 03:52 PM
Veteran Member
It would be interesting if someone did the same in the 5.0L XK's and F-Types then we could confirm for sure.
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