F-Type R Lag at 4K RPM
#1
![Default](/forum/images/icons/icon1.gif)
Hey, guys - driving a ‘17 F-Type R (bone stock)
Noticing a lag at 4K rpm where the needle stops (maybe even drops a bit) before regaining momentum. Traction control light isn’t coming on, so doubt the car is cutting back my power. Could it be the choppy front wheel assist kicking in? (i.e., I haven’t lost traction but the rears need a hand and the pause/drop is the transfer of power to the fronts) Has anyone else experienced this?
Thanks,
Rick
Noticing a lag at 4K rpm where the needle stops (maybe even drops a bit) before regaining momentum. Traction control light isn’t coming on, so doubt the car is cutting back my power. Could it be the choppy front wheel assist kicking in? (i.e., I haven’t lost traction but the rears need a hand and the pause/drop is the transfer of power to the fronts) Has anyone else experienced this?
Thanks,
Rick
#2
Join Date: Nov 2019
Location: (Illinois) - Led by Gov. PRICKster
Posts: 1,498
Received 984 Likes
on
565 Posts
![Default](/forum/images/icons/icon1.gif)
Could be lots of things, and hard to tell with brief description. How many miles on your car? Any Error/warning lights?
You said "Traction control light isn’t coming on, so doubt the car is cutting back my power.", so why don't you turn off the traction control and verify that first?
Is it a hesitation? Sputtering? or just goes flat? 4-6K hesitation usually points to ignition (coil(s) or plug(s), depending on mileage. Some have also experienced a slipping Supercharger belt...tensioner pully or belt could be worn?
Do you still have a warranty? If so, dealer should be able to tell quickly.
DC
You said "Traction control light isn’t coming on, so doubt the car is cutting back my power.", so why don't you turn off the traction control and verify that first?
Is it a hesitation? Sputtering? or just goes flat? 4-6K hesitation usually points to ignition (coil(s) or plug(s), depending on mileage. Some have also experienced a slipping Supercharger belt...tensioner pully or belt could be worn?
Do you still have a warranty? If so, dealer should be able to tell quickly.
DC
#3
![Default](/forum/images/icons/icon1.gif)
Could be lots of things, and hard to tell with brief description. How many miles on your car? Any Error/warning lights?
You said "Traction control light isn’t coming on, so doubt the car is cutting back my power.", so why don't you turn off the traction control and verify that first?
Is it a hesitation? Sputtering? or just goes flat? 4-6K hesitation usually points to ignition (coil(s) or plug(s), depending on mileage. Some have also experienced a slipping Supercharger belt...tensioner pully or belt could be worn?
Do you still have a warranty? If so, dealer should be able to tell quickly.
DC
You said "Traction control light isn’t coming on, so doubt the car is cutting back my power.", so why don't you turn off the traction control and verify that first?
Is it a hesitation? Sputtering? or just goes flat? 4-6K hesitation usually points to ignition (coil(s) or plug(s), depending on mileage. Some have also experienced a slipping Supercharger belt...tensioner pully or belt could be worn?
Do you still have a warranty? If so, dealer should be able to tell quickly.
DC
#6
![Default](/forum/images/icons/icon1.gif)
File size is too big for the forum and unable to compress enough - do you have an email address I could send the video to / other ideas on sharing?
Trending Topics
#8
![Default](/forum/images/icons/icon1.gif)
Regarding the 4K lag, I’m starting to believe after some runs today that it may be the computer and nothing mechanical. My launch was in sport shifting but without paddle shifting activated - it could be that the computer started me in second (not 1st), then did a down shift at 4K into 1st to get better pull. Is anyone aware of the computer doing this? At a standstill puts or keeps you in second when slapping the shifter into sport mode rather than dropping you to first?
#9
Join Date: Nov 2019
Location: (Illinois) - Led by Gov. PRICKster
Posts: 1,498
Received 984 Likes
on
565 Posts
![Default](/forum/images/icons/icon1.gif)
Still working to post the video - I’ve got it on Google Drive, but sharing still requires permission.
Regarding the 4K lag, I’m starting to believe after some runs today that it may be the computer and nothing mechanical. My launch was in sport shifting but without paddle shifting activated - it could be that the computer started me in second (not 1st), then did a down shift at 4K into 1st to get better pull. Is anyone aware of the computer doing this? At a standstill puts or keeps you in second when slapping the shifter into sport mode rather than dropping you to first?
Regarding the 4K lag, I’m starting to believe after some runs today that it may be the computer and nothing mechanical. My launch was in sport shifting but without paddle shifting activated - it could be that the computer started me in second (not 1st), then did a down shift at 4K into 1st to get better pull. Is anyone aware of the computer doing this? At a standstill puts or keeps you in second when slapping the shifter into sport mode rather than dropping you to first?
DC
#10
![Default](/forum/images/icons/icon1.gif)
#11
![Default](/forum/images/icons/icon1.gif)
I know you can’t PM until you reach a minimum number of posts, but perhaps attachments and links are limited too?
#12
![Default](/forum/images/icons/icon1.gif)
Hey, guys - driving a ‘17 F-Type R (bone stock)
Noticing a lag at 4K rpm where the needle stops (maybe even drops a bit) before regaining momentum. Traction control light isn’t coming on, so doubt the car is cutting back my power. Could it be the choppy front wheel assist kicking in? (i.e., I haven’t lost traction but the rears need a hand and the pause/drop is the transfer of power to the fronts) Has anyone else experienced this?
Thanks,
Rick
Noticing a lag at 4K rpm where the needle stops (maybe even drops a bit) before regaining momentum. Traction control light isn’t coming on, so doubt the car is cutting back my power. Could it be the choppy front wheel assist kicking in? (i.e., I haven’t lost traction but the rears need a hand and the pause/drop is the transfer of power to the fronts) Has anyone else experienced this?
Thanks,
Rick
#13
![Default](/forum/images/icons/icon1.gif)
your recurrent solution of turning the belt inside out reminds me of the StarTrek remedy for any adverse situation: Reverse the polarity!
The following users liked this post:
BruceTheQuail (04-07-2020)
#14
![Default](/forum/images/icons/icon1.gif)
Problem will be car hitting limiter kicking in , next question
Last edited by George05; 03-28-2020 at 08:02 PM.
#15
Join Date: Feb 2014
Location: Adelaide, South Australia
Posts: 8,433
Received 3,209 Likes
on
2,366 Posts
![Default](/forum/images/icons/icon1.gif)
Eh?
The F-Type has a default rev limiter set at 4,000 rpm, but that is only while sitting still in either N or P.
A VAP tune (and I guess others) removes this.
No doubt the OP is NOT talking about this, he is talking about a flat spot at 4,000 RPM while driving.
The F-Type has a default rev limiter set at 4,000 rpm, but that is only while sitting still in either N or P.
A VAP tune (and I guess others) removes this.
No doubt the OP is NOT talking about this, he is talking about a flat spot at 4,000 RPM while driving.
#16
![Default](/forum/images/icons/icon1.gif)
Hi ozzie my bets still on the limiter , jaguar for some reason as you have pointed outy set that to 4000 revs go to top of the class and pour a cuppa tea or what ever you do in ozz . if You remember i had a race chip gs instaled in my xkr it would hit that limiter from a standing start IE. flooring it from 0. jaguar fitted this to stop the engine from exploding it is not a race car. over to you
#18
![Default](/forum/images/icons/icon1.gif)
Last edited by RacerX; 03-28-2020 at 09:57 PM.
#19
![Default](/forum/images/icons/icon1.gif)
Out of interest, what's your ratio of wins to losses for your bets?
#20
![Default](/forum/images/icons/icon1.gif)
If im reading this correctly, this only happens from a standing start not when accelerating in say 3rd, 4th etc.
Sounds like the car is starting you in 2nd, its supposed to unless you chose 1st and then when you accelerate hard it kicks you down into 1st.
Its definately not a rev limiter as others have said, why would you have a rev limiter at 4k lol
Sounds like the car is starting you in 2nd, its supposed to unless you chose 1st and then when you accelerate hard it kicks you down into 1st.
Its definately not a rev limiter as others have said, why would you have a rev limiter at 4k lol