The new 997 GT2 advertises titanium exhaust. What is the advantage of titanium over stainless steel? Is it weight only? What about durability, sound quality, and performance? Does anyone recommend any 99TT titanium exhaust, if so, which brand? Thank you for any advice.

 

Temperature, it leads to cracking. Jets and some rocket engines have used it for years. F1 racing have also used it. Check out some of the F1 engine runs on youtube. They are amazing.

 

Kreissieg:

titanium

 

Designtek's system is very popular in the UK.

http://www.designtek.eu/pages/produc...6ttitanum.aspx

Great sound and big weight saving.

C.

 

I have just removed a design tek, it is extremely light.

Sounds ok but after I had it fitted a while it started to bring CEL on, they wanted to change some settings within the ECU to allow it to work correctly.

not a great service from them if I am honest.

Changed for a Milltek now, sounds a great deal better and and it feels quicker.

 

Isn't Milltek a stainless steel system?

 

I can see the advantage in regards to weight and stiffness, as Ti is approximately half that of SS. What would concern me more is clorine fatigue. When Ti is exposed to element clorine (the same stuff in water), and then thermal cycled,
it has a propensity to develope cracks. This was first uncovered during the early 60's with the SR71 Blackbird which was being developed at Skunkworks. They found that the high concentration of clorine in the Burbank water system was causing fatigue cracking. Ti exhaust's should come with a plackard that reads "use deionized water when washing"...LOL

 

Basically... from what I am reading into this, stainless stell Europipe is probably still best.

 

IF I had 5k to spend on an exhaust...EP. My 2c.

JB

 

I remember an instructor that said even graphite from a pencil traced on a jet nozzel would make a cut into the titanium during a high tempature run...

 

The titanium exhaust system of the 997 gt2 is made by akrapovic, they also fabricate a lot of aftermarket exhausts for motorbikes. I`m looking for a very light titanium system for my 996 tt with low backpressure. I want to have a quiet exhaust sound, if possible. I know of 3 fabricators...does anybody know which one is the quietest of them?

JIC:

http://www.vividracing.com/catalog/p...ducts_id/21241

Design Tek:

http://www.designtek.eu/pages/produc...6ttitanum.aspx

Kreissieg:

http://www.vividracing.com/catalog/p...oducts_id/8145

Which will not crack on the autobahn when running 200 mph for one hour :-) ?

 

The designtek looks great! The one with the bypasses is pretty cool also. I would say which ever one doesn't throw codes!

I wonder how bad the cabin resonance is?

Seth

 

Alot of misinformation in this thread...sad. Ti is light, very anti-corrosive, and should last longer than your chasis. EVERYTHING comes down to the grade of Ti used and if the welders are experienced and use the proper shielding technique/gas (usually Argon).
GM made the C5Z06 exhaust out of Ti...absolutely beautiful and unbelieveably light...I've never heard of one cracking...ever. And when I had bypass pipes welded on my exhaust, my welder took the appropriate steps to assure integrity. It is a phenomenal material, but very expensive and requires special technique.

If you really want to know the properties of Titanuim...go here and read-up...
http://www.titanium.org/index.cfm


Corrosion Resistance and Mechanical Properties of Ti-Ni-Pd-Ru-Cr Alloy
SKU: 1995-2624


Corrosion Resistance and Mechanical Properties of Ti-Ni-Pd-Ru-Cr Alloy
Yashiki, T.: Titanium Technology Department, KOBE STEEL, LTD. 3-1, Shinhama, 2-chome, Arai-cho, Takasago, HYOGO 676, JAPAN; Sugizaki, Y.; Satoh, H.: Materials Research Laboratory, KOBE STEEL, LTD., 5-5, Takatsukadai, 1-chome, Nishi-ku, Kobe, HYOGO 651-22, JAPAN; Mori, K.; Yano, H.: Steel Casting & Forging Plant Takasago, KOBE STEEL, LTD. 3-1, Shinhama, 2-chome, Arai-cho, Takasago, HYOGO 676, JAPAN; Ito, Y.: Titanium Technology Department, KOBE STEEL, LTD. 1-3, Bigo-cho, 4-chome, Chuo-ku, Osaka, OSAKA 541, JAPAN; Ishimoto, H.: Engineering Design & Technical Service Center, IDEMITSU ENGIEERING CO., LTD. 37-24, Shinden-cho, Chuo-ku, Chiba 260, Japan; Tomoyasu, Y.: Inspection Section, IDEMITSU ENGINEERING CO., LTD. 1-1, Miyamae-cho, Tokuyama, YAMAGUCHI 745, Japan

Titanium '95 Science and Technology
First Published by The Institute of Materials
Proceedings of the 8th World Conference on Titanium Held at the International Convention Centre, Birmingham, UK October 22-26, 1995
Severe crevice corrosion in condensed chloride media at high temperature limits for the practical application of commercially pure titanium. In order to develop a new titanium alloy that has excellent resistance to crevice attack, we have carried out the development program, which has resulted in the development of Ti-Ni-Ru-Pd-Cr alloy. The compositions of alloying elements leading to high cost or degradation of workability are kept low in the alloy. This paper reviews the evaluation studies for corrosion resistance and mechanical properties of the alloy. Some mill products of the alloy were manufactured in the industrial process used for unalloyed titanium. The corrosion resistance and mechanical properties were evaluated using the products. From the corrosion test, it is found that co-addition of chromium with nickel and noble metals considerably improves general and crevice corrosion resistance of titanium. The resistance to crevice corrosion appears to be almost equivalent to that of Ti-Pd alloy in condensed chlorine solutions at elevated temperatures. The mechanical properties of this alloy were examined by measurement of Young’s modulus and tensile strength. The results indicate that small amount additions of the alloying elements don’t influence the mechanical properties, which are comparable to unalloyed titanium. The welded tubes and seamless tubes were successfully manufactures in the same way as unalloyed titanium. These results suggest that this alloy can extended the application of titanium to more sever environments in offshore structures, oil refining and petrochemical plants.

 

I have run a JIC Titanium Full Exhaust for over a year now...they dont crack.

 

What is the weight of the JIC exhaust? Could not find it in your description? Shipping to germany possible? Perhaps you could make an offer, shipped to ger. master@turbodruck.com