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IMHO no way. If you're aware of the issue and take two basic precautions you should be in very good shape. First- stick within Porsche's recommended ride height range when on the stock wheels. Second- avoid curb surfing at the track and over big potholes on the street. If you can do those two things you'll almost certainly never have an issue, and worst case it's an insurance claim.
That said it's a shame Porsche didn't address the problem with a design change (ie longer jounce travel) and/ or a ride height warning given that they have known about this issue for a few years. Between GT4s and 991 GT3s we've seen half a dozen cars on this site with the issue? On the order of half a percent of the represented perhaps?
I'm pretty sure we've all hit a pothole we didn't see or have time to react to.
I'm pretty sure we've all hit a pothole we didn't see or have time to react to.
Yep. If it's too big (think taking a speed-bump at 40 mph) you're looking at an insurance claim. Almost certainly if you've lowered the car.
Porsche has been pulling bump travel out of the cars for decades. They took out nearly 10 mm from the 997 to 991, and the tire sidewall's being getting shorter at the same time. It's left less margin than there once was.
Hit a dead animal at 4AM doing 70mph.
Wiped out hood, bumper, radiator, etc.
Insurance covered the damage (thanks USAA) $30,000
Car gone for an 18
But it still has a clean Carfax
I'm going to go out on a limb here and say that this is not a common occurrence and Also not something that we need to worry about as a routine event.
I meant to say, this is a terrible design defect and everyone who has a configurable RS allocation needs to back out of the deal right away and let me know what dealership they were ordering from.
Hit a dead animal at 4AM doing 70mph.
Wiped out hood, bumper, radiator, etc.
Insurance covered the damage (thanks USAA) $30,000
Car gone for an 18
But it still has a clean Carfax
The car 2015 GT3
Broken strut tower mount
That's interesting that the tower shears off like that. And the part looks like it came out cleanly. It's almost like it's designed in so that the part is replaceable rather than destroying the whole front end. Maybe Porsche engineers are smarter than we are at designing cars....?
Mount replaced!
Bob Moore Collision is a authorized Porsche repair facility and they did a great job with the repair!
I'am in LA and this happened in Oklahoma.
Mount replaced!
Bob Moore Collision is a authorized Porsche repair facility and they did a great job with the repair!
I'am in LA and this happened in Oklahoma.
That's funny. I bought my car from Bob Moore. Good guys.
That's interesting that the tower shears off like that. And the part looks like it came out cleanly. It's almost like it's designed in so that the part is replaceable rather than destroying the whole front end. Maybe Porsche engineers are smarter than we are at designing cars....?
Part that’s designed fail and is easy and cheap to replace = smart. Bent rim, deformable strut, etc.
Part that’s designed to fail and costs $20k+ to replace + likely hood damage, etc = not so smart.
Part that’s designed fail and is easy and cheap to replace = smart. Bent rim, deformable strut, etc.
Part that’s designed to fail and costs $20k+ to replace + likely hood damage, etc = not so smart.
Agree but when you take out the front end by hitting an object and that includes the radiator and bumper, the cost to repair is gonna be high. It would be higher if, instead of the shock tower shearing off and hurting the hood, the impact caused the unibody to bend. Getting the car back to reasonable driving condition in that case would be much more difficult because bending a deformed unit body is a lot harder than replacing the shock mount. It seems to me that these shock towers shear at moments of significant impacts. Who knows what vector forces were at play but it seems to me that these were non standard impacts. The number of gt3's that aggressively attack curbing at the track is way higher than the number of these incidents that seem to have been reported. But I agree the data we have may be biased since not everyone who has an issue like this is a rennlist member. But many rennlist members track their cars.
sure hit pot hole or LS gators
but on 997 996 964, 993, 911 this doesnt blow up...
so what is going on?
is BMW engineers working at PAG now?
991 gt chassis is way more stiff than the 997,996,964,993, 911. More energy dissipates into the mount point as a result of less chassis flex. Price you pay for flat cornering.
The 991.2 RS and gt2 are Rose jointed so even more energy is going right to the shock tower mounts since the ball joints are solid without any rubber to absorb energy. I said it before- Everybody should give up their gt2 and .2 RS allocations now if you don't want this failure to happen to you.
That's interesting that the tower shears off like that. And the part looks like it came out cleanly. It's almost like it's designed in so that the part is replaceable rather than destroying the whole front end. Maybe Porsche engineers are smarter than we are at designing cars....?
I'm with you. I'm well aware of what I don't know.
If your 991 somehow suffers this issue you're covered under warranty. There's a known fix to this problem. Heck, Manthey even manufactures a reinforcement kit for their GT4 and Cup cars racing in VLN so you can strengthen your top mounts as a preventative measure.
05-24-2018, 06:06 PM
