Thumping noise in rear passenger wheel

[ArticBoxster]

I got a 99' and the rims are AT Itailia Riva's 18X8.5 (forged 2-piece and not 3 my mistake). I got these rims from Tire Rack with different Kumho's from the ones I'm using now from Discount Tire. The tire reads 51psi max. These tires are Kuhmo Ecsta MX. Did the Fabspeed exhaust system, intake, and Brembo cross drill brakes with fire red Brembo calipers. I'll have the dealer look at it, just wanted to use the money on upgrades not a repair that maybe easy to do myself. I couldn't believe how much Porsche Barrier charged me for replacing the coolant resevoir, $1,600 bucks............ Thanks everyone!

[944boy]

Hey I just realized your in seattle area as well. If you want me to take a look (for free) I can maybe help diagnose it.

I would never take anything to Barrier unless it was under warranty. They can be good but also tend to take people to the cleaners for maintenance. Thats why I do all of my own work. I think you have some good advice from here for things to look at.

51psi is max you should be running considerably less. MX's are good tires however.

[Topless]

Originally Posted by ArticBoxster

I got a 99' and the rims are AT Itailia Riva's 18X8.5 (forged 2-piece and not 3 my mistake). I got these rims from Tire Rack with different Kumho's from the ones I'm using now from Discount Tire. The tire reads 51psi max. These tires are Kuhmo Ecsta MX. Did the Fabspeed exhaust system, intake, and Brembo cross drill brakes with fire red Brembo calipers. I'll have the dealer look at it, just wanted to use the money on upgrades not a repair that maybe easy to do myself. I couldn't believe how much Porsche Barrier charged me for replacing the coolant resevoir, $1,600 bucks............ Thanks everyone!

Factory tire pressures- 29F, 36R might ride and handle a lot better. FYI

[CJ_Boxster]

The 51psi marked on ur tire is the Maximum tire pressure not to be exceeded, it's not a pressure recommendation by the tire manufactor, take down the pressure to around 36-37 psi and fronts to 32psi.

For instance, when the tire says 51psi Max. That means 51psi=very high, 52psi - Up=danger of tire failure. The max isn't a pressure recommendation, it's just a warning not to exceed that pressure.

As for ur thump, set ur tires to our recommendations then go for another drive and check for noises again and let us know if it's still there

[ArticBoxster]

Thanks for the tire pressure info, but resetting it did not help. I set it to the recommendation off the Firestone Website for this wheel and tire size (http://www.firestonecompleteautocare.com/tires/pressure.jsp) and the sound is still there. Maybe I did bust a cord but I'll wait until this weekend for the mechanic to check....It just strange that this suddenly happen. I was saving up to replace my Boxster body parts with fiberglass to lighten up the car...but thanks for the tire PSI education...very informative

[renzop]

Slow down a bit. Did you read what the factory specs for tire pressure are? Set your tires to those pressures not what Firestone says.

Also since you drove around with 51psi you may have broken a belt in one of the tires. Just go to a tire shop and tell them you suspect that one tire might have a broken belt. See what they say. Stay away from the dealer because as you said they are expensive.

[FTD]

Let us know what resolves it! I keep thinking drop links....

[tommy986]

I keep thinking there is a rabbit in the trunk.