Slow accel performance but no codes.
#1
Slow accel performance but no codes.
2016 F-Type V6S RWD owner of about a year. I've never been wowed by the acceleration of this car, and I own a N/A 2007 XK with the 4.2 V8. That car has always felt like it pulled harder. Comparing the weight, horsepower, and torque figures, the F-Type S should be the faster car.
I just did a track event at VIR, which I have done with the XK before. I didn't come near the same top speeds of the (on paper) slower XK. The F-Type is far better handling/braking, etc., but the acceleration is disappointing. It feels like at 200-250hp car, which makes me thing something is wrong with it. However, there are no codes. It sounds strong, revs strong, and performed like a champ for 2 days on the track except for the slow accel. It was in the sport shifting mode, with Dynamic mode selected and the traction control off. One of my instructors drove the car and also agreed it doesn't accelerate anything like a 380hp car should, even considering the weight of the vehicle.
There must be something wrong here. Any advice or suggestions? Could the supercharger just not be working correctly? I've read quite a bit on these forums about supercharger coupling issues, etc.
My next plan is to take it to a dyno to see what it is actually putting out in terms of power. No "you should have bought a V8S or R":jokes, please. The car just isn't putting out anything close to the stock figures.
Thanks in advance for your help.
Peter
Winston-Salem, NC
I just did a track event at VIR, which I have done with the XK before. I didn't come near the same top speeds of the (on paper) slower XK. The F-Type is far better handling/braking, etc., but the acceleration is disappointing. It feels like at 200-250hp car, which makes me thing something is wrong with it. However, there are no codes. It sounds strong, revs strong, and performed like a champ for 2 days on the track except for the slow accel. It was in the sport shifting mode, with Dynamic mode selected and the traction control off. One of my instructors drove the car and also agreed it doesn't accelerate anything like a 380hp car should, even considering the weight of the vehicle.
There must be something wrong here. Any advice or suggestions? Could the supercharger just not be working correctly? I've read quite a bit on these forums about supercharger coupling issues, etc.
My next plan is to take it to a dyno to see what it is actually putting out in terms of power. No "you should have bought a V8S or R":jokes, please. The car just isn't putting out anything close to the stock figures.
Thanks in advance for your help.
Peter
Winston-Salem, NC
Last edited by winstonsalemncxk; 04-14-2022 at 04:30 PM.
#2
Peter, hello from Chapel Hill.
As a quick starting point, what does your 0-60 look like? It should be 4.2-4.4 sec's and roughly the same as a XKR.
If it's much over that, something's not right - like your supercharger isn't engaged, but I'd expect that would throw a code.
As a quick starting point, what does your 0-60 look like? It should be 4.2-4.4 sec's and roughly the same as a XKR.
If it's much over that, something's not right - like your supercharger isn't engaged, but I'd expect that would throw a code.
Last edited by uncheel; 04-14-2022 at 05:17 PM.
#3
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winstonsalemncxk (05-06-2022)
#5
Greetings, all. I will try to time and video a 0-60 run tomorrow. No smells at all. I haven't driven another F-Type for comparison, but this one is surely not putting out the power that it should. It still has all the theater (pops, bangs, and crackles!) but it isn't as fast as it sounds. I'm tempted to dyno it to see what it is putting out currently. Will keep this thread updated as I learn more and get it to a tech.
#6
From what you've described, I think the 0-60 will confirm a problem without having to go through a dyno run. There's only so much that can compromise your power that much while letting the car run OK - which is why I leaned toward the supercharger. It's hard to find mechanics (around here, anyway) that will work on the newer models. But you might check with Foreign Accents in Greensboro. He, at least, is a JLR factory trained master mechanic.
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winstonsalemncxk (04-14-2022)
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#8
Jaguny,
Thanks for your suggestion, but it is definitely in Dynamic Mode (not Snow/Rain). I also tried both with traction control off and Trac DSC settings, and the shifter is in sport. All settings set to maximize performance. I'm leaning toward a supercharger issue. Now to diagnose.
Thanks,
Peter
Thanks for your suggestion, but it is definitely in Dynamic Mode (not Snow/Rain). I also tried both with traction control off and Trac DSC settings, and the shifter is in sport. All settings set to maximize performance. I'm leaning toward a supercharger issue. Now to diagnose.
Thanks,
Peter
#9
Jaguny,
Thanks for your suggestion, but it is definitely in Dynamic Mode (not Snow/Rain). I also tried both with traction control off and Trac DSC settings, and the shifter is in sport. All settings set to maximize performance. I'm leaning toward a supercharger issue. Now to diagnose.
Thanks,
Peter
Thanks for your suggestion, but it is definitely in Dynamic Mode (not Snow/Rain). I also tried both with traction control off and Trac DSC settings, and the shifter is in sport. All settings set to maximize performance. I'm leaning toward a supercharger issue. Now to diagnose.
Thanks,
Peter
#10
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winstonsalemncxk (04-15-2022)
#17
Hey Peter, I would watch this video. Sal goes over a very similar problem with a slow boost on his 2015 V6S. I have the same car and I might honestly need to time my 0-60 to check mine as well.
https://www.youtube.com/watch?v=a819...
https://www.youtube.com/watch?v=a819...
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OzXFR (04-16-2022)
#18
Hey Peter, I would watch this video. Sal goes over a very similar problem with a slow boost on his 2015 V6S. I have the same car and I might honestly need to time my 0-60 to check mine as well.
https://www.youtube.com/watch?v=a819...
https://www.youtube.com/watch?v=a819...
This is really helpful. Mine isn't throwing a code, but this sounds like it matches the other symptoms. At the end of the video, when the supercharger puts out more boost on hard acceleration, you can really hear the supercharger whine. I don't hear this at all with my car.
Do you all normally hear the whine of the supercharger on hard acceleration? I'd heard it is quieter on the F-Type than on the XK, but I don't think I've ever heard it before. All signs are pointing to a supercharger system problem.
Thanks,
Peter
#19
Cwis,
This is really helpful. Mine isn't throwing a code, but this sounds like it matches the other symptoms. At the end of the video, when the supercharger puts out more boost on hard acceleration, you can really hear the supercharger whine. I don't hear this at all with my car.
Do you all normally hear the whine of the supercharger on hard acceleration? I'd heard it is quieter on the F-Type than on the XK, but I don't think I've ever heard it before. All signs are pointing to a supercharger system problem.
Thanks,
Peter
This is really helpful. Mine isn't throwing a code, but this sounds like it matches the other symptoms. At the end of the video, when the supercharger puts out more boost on hard acceleration, you can really hear the supercharger whine. I don't hear this at all with my car.
Do you all normally hear the whine of the supercharger on hard acceleration? I'd heard it is quieter on the F-Type than on the XK, but I don't think I've ever heard it before. All signs are pointing to a supercharger system problem.
Thanks,
Peter
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winstonsalemncxk (04-16-2022)
#20
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Cwis,
This is really helpful. Mine isn't throwing a code, but this sounds like it matches the other symptoms. At the end of the video, when the supercharger puts out more boost on hard acceleration, you can really hear the supercharger whine. I don't hear this at all with my car.
Do you all normally hear the whine of the supercharger on hard acceleration? I'd heard it is quieter on the F-Type than on the XK, but I don't think I've ever heard it before. All signs are pointing to a supercharger system problem.
Thanks,
Peter
This is really helpful. Mine isn't throwing a code, but this sounds like it matches the other symptoms. At the end of the video, when the supercharger puts out more boost on hard acceleration, you can really hear the supercharger whine. I don't hear this at all with my car.
Do you all normally hear the whine of the supercharger on hard acceleration? I'd heard it is quieter on the F-Type than on the XK, but I don't think I've ever heard it before. All signs are pointing to a supercharger system problem.
Thanks,
Peter
Two things boosted (terrible pun intended!) the SC whine on my V6S a lot, firstly the larger crank pulley with the associated tune (which alters how the SC bypass valve operates) and then the Mina Gallery lower intake system (which removes the baffles in the lower intakes).
I'm guessing the car in the vid has one or both of those things.
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winstonsalemncxk (04-16-2022)