2010 RS titanium exhaust setup - Page 2 - 6SpeedOnline - Porsche Forum and Luxury Car Resource

#16

03-25-2010, 12:49 AM

mikymu

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Quote:

Originally Posted by JMD0977

And its just as restrictive as the one the non rs 997.2 GT3.

So why did Porsche spend more money on the titanium center mufflers when it has no performance benefit? The mystery deepens ...

Quote:

Originally Posted by champ_1

Porsche has been using Inconel alloy on some of their race car applications. The RSR full exhaust is made from inconel and the Grand AM GT cars as well.. Dont know for sure that they will change that to go with Titanium. Looking at the picture of the GT3R all the piping seems to be Inconel.

Inconel, what an interesting alloy. It's mostly compose of nickel and chromium with sprinkle of other elemental metals including titanium depends on desire properties. Inconel alloys are oxidation and corrosion resistance but it's ability to retains strength over a wide range of temperatures is what makes it attractive among aerospace and auto racing industries. Inconel alloy has a melting point around 2400F (depend on content of alloy) which is below pure titanium's 3034F but it's good enough to be used as skin covering X-15 experimental plane. I think most Inconel alloys are about 30% lighter than steel.

So why not just use titanium alloy since it has the highest strength-to-weight ratio (about 40-45% lighter than steel) with better heat resistance property? I think price may be the reason why Porsche used Inconel instead of titanium on the RSR.

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