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SpeedTech 991.2 GT3 Exhaust Development Thread

 
Old 01-20-2019, 06:25 PM
  #16  
Waxer
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If you are tracking a lot Ti is not the best option. Ti will crack under very hot temps and cooling cycles. Thatís why factory race cars use Inconel but VERY $$$$.

Stainless is the more more durable choice and it wonít make a bit of difference in your lap times.
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Old 01-20-2019, 06:47 PM
  #17  
ilovecarbs
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Originally Posted by Waxer View Post
If you are tracking a lot Ti is not the best option. Ti will crack under very hot temps and cooling cycles. Thatís why factory race cars use Inconel but VERY $$$$.

Stainless is the more more durable choice and it wonít make a bit of difference in your lap times.
Titanium definitely cracks (from personal experience), but if I remember correctly the 991 RSR uses inconel headers/titanium exhaust. But thatís a factory team with a seemingly unlimited budget. As a privateer, if I tracked a lot Iíd stick with SS, and this is coming from someone with a full titanium race pipe.
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Old 01-20-2019, 10:01 PM
  #18  
John D II
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Originally Posted by erik_plus8 View Post
If you come up with something that you can guarantee deletes the 1500-3500rpm drone/booming with the valves open - you have a customer. That particular offer doesn't seem to exist on the market yet...
That's our goal erik. We have been very successful eliminating drone on other challenging Porsche models, so we plan to employ what we have learned in the past and attempt to create a drone free design here...

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Old 01-20-2019, 10:06 PM
  #19  
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Iíd take a design like the JCR race pipe but in stainless steel
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Old 01-21-2019, 11:51 AM
  #20  
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Originally Posted by John D II View Post
We have been very successful eliminating drone on other challenging Porsche models, so we plan to employ what we have learned in the past and attempt to create a drone free design here...
Acoustic holography cameras/microphone arrays have come down in price quite a bit...
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