Gonzogonzilla

I've blown four tires on my Pan Exec Hybrid/4 already. Two were Pirelli's that went out on a dirt road that was graded. I was pissed, so I had them all switched out to Michelin's. Then, last Friday, I was forced into these small jar-top looking things that they used to demark lanes in Arizona. Blew the front and wrecked the back tire.

None of this should have happened. All tires were blown through the sidewall and not the tread. Is it the weight of the car? The design of the tires? Bad luck and trouble? What?

Anyone?

skiracer

No blown tire issues for me in 30k miles of driving in all types of weather and road conditions, including a 3k mile winter road trip to Canada loaded to max weight. However, I do not drive my car off-road as I have an H2 for that. All of my PTT tires are Michelin's.

justabout

Does the hybrid require a special tire load rating relative to non-hybrids. I would verify the load rating is correct.

Gonzogonzilla

Very interesting. I’m wondering if Porsche, using low profile tires, have overloaded this chassis with electromotive and gasoline engines. That’s a pretty big mistake and a dangerous one, at that.

jnolan

the electric motor is inline with the engine and transmission (just 1 electric motor instead of the two that the 918 has) and the battery weighs around 500 lbs. All Porsche tires are N spec, made by the selected manufacturer to the specs of the vehicle. The load rating for the tires on this model are XL, which is just a hair under 2,000 lbs per tire. 5,500 lb car, dry, with 8,000 lbs of tire capacity.

Dirt roads are really tough on performance tires and you say you ran over road markers in the second case. You should have the tires inspected in the spirit of failure analysis but it does not sound like tire design is at fault. If you fail in the sidewall on a low profile tire after running over something, pinching is the likely cause. But someone who knows tires should analyze your failed tires to give you an anwser.

dabear

60k miles over 2 different PTTs and no tire issues. I don't think its a design/tire issue.

Mike Billings

For sure you need to know what the tire pressure was to get anywhere with the tire engineers.

Gonzogonzilla

I’m kind of a nut on having my tire pressures dead on, as I track my GT3’s. They were correct at the time of failure. I’m thinking that it’s just bad luck at this point.