Hood moves around alot above 100 mph

[331GT]

I was driving in the rain and came to an area where there was a stream of water crossing the highway. The car hydroplaned and took a hard right across 3 lanes and hit a guardrail.

Dash cam video:

out of curiosity, what kind of tires? i ran PS4S on my 19 all summer and through fall and i really did not like the way the car felt in the rain, even at 60 or 65. i would feel the rear slipping around a lot more than i would have liked. yours seemed like it came out of nowhere, you can see the water in the video, but i probably would have been caught off guard by it as you were. sorry to see and hear, really sucks. gt500 no less.

Sponsored

 

[HKusp]

out of curiosity, what kind of tires? i ran PS4S on my 19 all summer and through fall and i really did not like the way the car felt in the rain, even at 60 or 65. i would feel the rear slipping around a lot more than i would have liked. yours seemed like it came out of nowhere, you can see the water in the video, but i probably would have been caught off guard by it as you were. sorry to see and hear, really sucks. gt500 no less.

I had Nitto 555G2's. They had probably 15k miles on them and certainly had lost some tread depth, but they weren't showing the wear bars or balding. It definitely was a shock when it broke loose. I saw the water and actually let off the gas too. It wasn't like the back tires were providing thrust at the moment where I crossed the water.

 

[331GT]

I had Nitto 555G2's. They had probably 15k miles on them and certainly had lost some tread depth, but they weren't showing the wear bars or balding. It definitely was a shock when it broke loose. I saw the water and actually let off the gas too. It wasn't like the back tires were providing thrust at the moment where I crossed the water.

gotcha. sucks. least you're back in a 2018 now.

 

[The Demon]

I had Nitto 555G2's. They had probably 15k miles on them and certainly had lost some tread depth, but they weren't showing the wear bars or balding. It definitely was a shock when it broke loose. I saw the water and actually let off the gas too. It wasn't like the back tires were providing thrust at the moment where I crossed the water.

Same as I have. From the looks of the slide the guard rail was going to end. That could have been much worse if the car flipped in the grass.

 

[Coastal-Mach]

I bet you were " Ready to kill a man" after that. Glad you are ok, I had my 03 Mach cross lanes with Nittos as well, when caught in a sudden storm. I was lucky and did not hit anything.

 

[HKusp]

Same as I have. From the looks of the slide the guard rail was going to end. That could have been much worse if the car flipped in the grass.

Yeah, I ride by that guardrail probably 10 times a week and admire the shiny new section. I have been looking at it like I may have not done as much damage if I had missed the guardrail, but you may be right, the car may have well flipped if it dug into the soft grass. Thanks for the perspective on that.

 

[Decosse]

TL;DR -Did you check your under-engine belly pan and air dam?

Living in the SW US, we have plenty of opportunities to run at speed with rural highways being posted 70-75-80 mph. Our Mustang group goes on monthly "runs", where we may go for miles at 80 with bursts a bit (ahem ) higher. My 16 initially had the high-speed flutter, but when someone at a car show backed into it (fortunately only the front fascia and crush panel), the body shop adjusted it during repairs.
So I was surprised a few weeks ago that on one of our runs it started fluttering at 80 and was so bad at 100 I slowed.
Turns out a few weeks before I had to straddle one of those chunks of truck tire and it had torn off the air diverter (dam) from the under-engine belly pan (splash shield). Not sure what the 2018s have, but the 15-17 used the same ones for most non-Shelby, non PP models.
Anyway, had it replaced a couple of weeks ago, and had a chance to test it- no flutter at all, and steady as a rock.

 

[dpAtlanta]

After reading this thread last week-end, I wondered if I would have a problem with hood vibration at high speeds....................... well, I had plenty to drink and didn't want to drive on public roads, so I used my driveway. It made perfect sense to me in my current state of mind to do the test safely while protecting the general public.

I needed a longer driveway:

SARSASM DISCLAIMER
Complete sarcasm and a stolen internet photo

 

[Decosse]

After reading this thread last week-end, I wondered if I would have a problem with hood vibration at high speeds....................... well, I had plenty to drink and didn't want to drive on public roads, so I used my driveway. It made perfect sense to me in my current state of mind to do the test safely while protecting the general public.

I needed a longer driveway:
SARSASM DISCLAIMER
Complete sarcasm and a stolen internet photo

Soooo...??? Did it flutter...?

 

[Andy13186]

The only time I noticed hood movement was when there was a very strong crosswind

 

[WildHorse]

The only time I noticed hood movement was when there was a very strong crosswind

Me as well, or when a bug truck is going the opposite way on a 2 laner. Otherwise, haven't noticed any 'flutter' at all.

BTW my tires never hydroplaned in the 3.5 years I had them. Then a few times last fall I noticed the rear was getting a bit squirrelly going through standing water. Time to replace them, so I replaced them, even though they 'looked' good.

 

[Johnny Rockit]

Is it enough to damage paint on the hood edges or fenders? Didn't notice it Friday but then again I wasn't looking for it either.

 

[DopamineQuest]

Even the 500's do it if you leave the rain tray in. Taking it out fixed it but yea it happens on all s550's lol

 

[AZlb5.0]

Is it enough to damage paint on the hood edges or fenders? Didn't notice it Friday but then again I wasn't looking for it either.

It just tends to move with the airflow and at speed it’s more noticiable. It happens to a lot of front latching hoods. It’s not as noticeable with rear latched hoods like on the Corvette or Viper

 

[Cory S]

Mine hood starts moving around by 60mph. The rear and the sides lift about 1/8-1/4” every few seconds. My eyes are always catching it. It’s up and down play in the rear pivots in the closed position.

Sponsored