Bumpy ride
Hi all, My ride quality is pretty bumpy at the moment. Trying to figure out the cause. I took it to a tire shop and had two of my rims restraightened and two tires replaced. Still bumpy. I have some to-do items in my que including supercharger isolator spring service and addressing a brake booster/ vacuum pump issue, but I can’t see how that would be related to my ride quality. I think it may have started after I disconnected and reconnected the battery to reset my EPB. But not really sure. My indie confirmed my air suspension is working fine. Thinking the adaptive suspension module may need resetting (if that is even a thing), but that is a wild guess. Any thoughts? Thanks. BTW I only have a Blue Driver OBDII reader. Not sure which reader would list suspension issues. |
Nedoerr, what size rim are you running? In addition, what pressure are you running in your tires? The larger the rim you are running, the less the tire can flex to absorb the imperfections in the road and therefore results in more bumps inside the cabin. The same is true for running higher pressures in the tires. The higher the pressure, the less the tire can flex. Most people find that keeping the tires at say 38 psi front/35 psi rear is a pretty good spot to sit to keep the tire at a high enough pressure to get good tire wear but be soft enough for a nice ride.
I have noticed that sometimes I will get a suspension worning if I start the car when it is parked on an uneven surface. This will force the car into dynamic mode and stiffen up the suspension. Grnated, I normally get a light on the dash when this happens. |
Thanks for the reply. I have the 20” stock rims with the 380mm brakes in the front. I inflate to 32 PSI, as indicated on my door frame. I haven’t changed the rear tires yet, so that remains a possibility. Not sure how much bumpiness is normal, but it feels more than I expect. Don’t remember it being this bumpy when I first bought it. No warning lights illuminate. If tires and rims are the most likely, I could take them back in to make sure they were straightened properly the first time. |
Question, is your ride bumpy or bouncy?
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Does the current XJ still have CATS ? When there are any faults recorded that could affect handling or braking, CATS will default to 'Hard' thus giving a harder ride than normal.
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The ride is bumpy (firmer) not bouncy (softer). I think it has the adaptive damping system as opposed to the CATS system. But maybe it also defaults to hard/dynamic mode if there is a fault. Is there any way to check what mode it’s in? Thanks |
OK, so this may sound weird, but had the same issue once after a car wash. It fixed itself after I did the same maneuver that race car drivers do to heat up their tires by turning the steering wheel abruptly left and right and swerving the car, but in a tight line. This rocked the car and after that the suspension "softened up". Call me crazy but it worked for me.
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Originally Posted by XJsss
(Post 2039400)
OK, so this may sound weird, but had the same issue once after a car wash. It fixed itself after I did the same maneuver that race car drivers do to heat up their tires by turning the steering wheel abruptly left and right and swerving the car, but in a tight line. This rocked the car and after that the suspension "softened up". Call me crazy but it worked for me.
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You do not need to be driving fast. I did it @35mph within my lane on a local street outside my neighborhood
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CATS is an adaptive suspension. Computer Active Technology Suspension.
Not sure if they still call it that on the current XJ or not? . . . |
I read somewhere that the CATS name went away for our X351 model. |
Tried the race-car maneuver, but the bumpiness remains. So I think I'll take it back to the wheel repair shop to make sure the wheels are properly balanced and circular. Perhaps I will need to entertain the idea of downgrading my rim size if the bumpiness persists.
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This post is edited
I must have accidentally posted somehow. This was the equivalent of a but dial only it was a post here. |
I would get the wheels balanced on a Roadforce balancer. This actually measures runout under a simulated load, so is much better for detecting and compensating for wheels and tires that are out of round.
What kind of tires do you have? My experience with Pirelli P Zero All Seasons was terrible. Chronic balance issues that could never be totally fixed, and terrible for flat spotting when parked. The Dunlops on my new XJL also will flat spot, typically takes 5-10 miles on the highway to totally settle down. |
So it turns out I had another damaged rim (two cracks in the rear drivers side). Repaired it and now the car is much better. These rims are pretty pathetic IMHO.
Still would like to do a little more suspension work to get i”everything perfect. But I’m going to stay focused on the powertrain for now. Maybe next year I’ll revisit the suspension. Thanks everyone. |
Originally Posted by Nedoerr
(Post 2091401)
So it turns out I had another damaged rim (two cracks in the rear drivers side). Repaired it and now the car is much better. These rims are pretty pathetic IMHO.
Still would like to do a little more suspension work to get i”everything perfect. But I’m going to stay focused on the powertrain for now. Maybe next year I’ll revisit the suspension. Thanks everyone. |
Originally Posted by Supercharged Jag
(Post 2091439)
Well I now have 4 Wheels sitting in storage for the same reason they’re bent. I got new aftermarket ones installed. Jaguar uses cheap metals and their wheels suck.
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Originally Posted by Mark SF
(Post 2091448)
So far we might have established that Jaguar wheels can be damaged, what has not been established is that aftermarket ones cannot be damaged. So your statement might be a tad hasty.
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I think it depends on what wheels you have?
I have 20" forged alloys (Farallon) on my XJR and never had any bending or cracking despite hitting several pretty big pot holes and all the normal road hazards. I don't think the other 20" rims are forged? . . . |
Originally Posted by clubairth1
(Post 2091727)
I think it depends on what wheels you have?
I have 20" forged alloys (Farallon) on my XJR and never had any bending or cracking despite hitting several pretty big pot holes and all the normal road hazards. I don't think the other 20" rims are forged? . . . I understand the 19” rims are also pretty resistant to bending. Maybe others with 19” rims can comment on this. Really all 20” rims should have been forged or something to prevent easy bending. It’s understandable to not do this on the 19” rims because they have more tire to absorb the road. |
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