Inconel exhaust? $$$ - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Gardus@Supersprint · 11-22-2012, 07:55 AM

Hi guys, I was wondering if anybody here would be interested in an inconel system...
What about a -20 kg for the full exhaust, included headers?
Price would be around double/triple the current Supersprint price.

JDMenrique · 11-22-2012, 09:24 AM

Interested, but we'd have to see the final product.

Gardus@Supersprint · 11-22-2012, 09:32 AM

Inconel headers may be interesting. Lots of companies are launching titanium catback systems, but it's extremely hard to make reliable titanium headers.
A set of headers with the same design as our 304 S.s. ones, included the front decat pipe, would weight something around 5-6 kg, against 17.4 of the stock items (included the two cats), and the 10.2 of the steel Supersprint.
We could use thinner walls thanks to the strenght of the material, and it's also lighter.

I wonder who would spend $ 3000 for a set.

Klar · 11-22-2012, 12:24 PM

Inconel would only be useful for the header and up/over pipe for a turbo system. Beyond that the weight saving are not that great for the money.

nonicname · 11-22-2012, 12:26 PM

Quote:

Originally Posted by Gardus@Supersprint

I wonder who would spend $3000 for a set.

rich people and idiots.

chulooz · 11-22-2012, 03:59 PM

$3,000?! You wish it would cost $3000 for a full inconel system. No, not feasible for production.

There are already people here who scoff at Ti units.

ImAwesome · 11-22-2012, 04:07 PM

Quote:

Originally Posted by chulooz

$3,000?! You wish it would cost $3000 for a full inconel system. No, not feasible for production.

There are already people here who scoff at Ti units.

he is referring to just the header

xjohnx · 11-22-2012, 04:29 PM

Can i get one made out of unobtanium?

Seriously guys, there comes a point of diminishing returns.

dj petey · 11-22-2012, 04:40 PM

This is why he's gauging interest. No need to flame the guy for doing market research.

Dimman · 11-22-2012, 05:53 PM

Quote:

Originally Posted by Gardus@Supersprint

Inconel headers may be interesting. Lots of companies are launching titanium catback systems, but it's extremely hard to make reliable titanium headers.
A set of headers with the same design as our 304 S.s. ones, included the front decat pipe, would weight something around 5-6 kg, against 17.4 of the stock items (included the two cats), and the 10.2 of the steel Supersprint.
We could use thinner walls thanks to the strenght of the material, and it's also lighter.

I wonder who would spend $ 3000 for a set.

Inconel is slightly heavier than stainless (625 v 304). Way more nickel in it.

It's the thickness reduction that allows the weight loss.

Gardus@Supersprint · 11-23-2012, 03:35 AM

Yes, I meant the headers in Inconel would be lighter than the SS one, sorry for the misunderstanding.

Density (2°C) is 8.44 g/cm^3 vs 7.90 g/cm^3 of the Aisi 304 stainless steel we use.
Titanium is around 4,5

@ 500°C:
Tensile strength is 760 MPa vs 483 MPA
Yield point (Rp0,2) is 290 vs 167
Basically you could make a 0.7/1 mm walls headers and still get a very resistant components.

The obvious advantage is resistance to corrosion and oxidation, both compared to SS but much more compared to Ti.

I guess a full system composed of an Inconel front part and a Ti rear part would be the best in terms of lightness and reliability.

robispec · 11-23-2012, 04:21 AM

we made a 3.1 KG aluminum cat back for our race car and it survived 30 minute sessions quite well... 70 degree farenheit ambiant temps.
Engine out, SS header transision pipe (the header can be used for NA SC or Turbo apps) over pipe and catted section weighed in (with the alu rear) at 9.1 KG complete. engine back.. time will tell on the durability. We are a chassis shop so we made the lightest part possible. The time attack car weights in @ 2505 with the full interior.
you can just see the 2.5" aluminum muffler and tailpipe just peeking out i think
SO I throw in SS to Aluminum into the light weight battle.

rear view

Gardus@Supersprint · 11-23-2012, 05:52 AM

Aluminium is ok for catbacks if it doesn't need to last many years and loudness isn't much of an issue.
Thinner stainless steel is a bit heavier but still ok.
For road use (fit&forget, no drone etc) I stil would go for 1/1,5 mm s.s..

robispec · 11-23-2012, 06:29 AM

agreed..we went only for light weight as our primary concern.

11-22-2012, 07:55 AM	#1
Gardus@Supersprint Banned Join Date: Nov 2011 Drives: Clio TCE Location: Mantova - Italy Posts: 494 Thanks: 17 Thanked 154 Times in 70 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Inconel exhaust? $$$ Hi guys, I was wondering if anybody here would be interested in an inconel system... What about a -20 kg for the full exhaust, included headers? Price would be around double/triple the current Supersprint price.

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11-22-2012, 09:32 AM	#3
Gardus@Supersprint Banned Join Date: Nov 2011 Drives: Clio TCE Location: Mantova - Italy Posts: 494 Thanks: 17 Thanked 154 Times in 70 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Inconel headers may be interesting. Lots of companies are launching titanium catback systems, but it's extremely hard to make reliable titanium headers. A set of headers with the same design as our 304 S.s. ones, included the front decat pipe, would weight something around 5-6 kg, against 17.4 of the stock items (included the two cats), and the 10.2 of the steel Supersprint. We could use thinner walls thanks to the strenght of the material, and it's also lighter. I wonder who would spend $ 3000 for a set.

11-22-2012, 12:24 PM	#4
Klar Member Join Date: Sep 2012 Drives: 2013 FR-S Whiteout Location: Austin, TX Posts: 57 Thanks: 11 Thanked 13 Times in 8 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Inconel would only be useful for the header and up/over pipe for a turbo system. Beyond that the weight saving are not that great for the money.

11-22-2012, 03:59 PM	#6
chulooz Registered you sir Join Date: Feb 2010 Drives: 99 impreza coupe Location: DC / CT Posts: 1,666 Thanks: 259 Thanked 380 Times in 207 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	$3,000?! You wish it would cost $3000 for a full inconel system. No, not feasible for production. There are already people here who scoff at Ti units.

11-22-2012, 04:29 PM	#8
xjohnx Grip>Slip Join Date: Jun 2012 Drives: 13 SWP BRZ Ltd - Innovate Powered! Location: RVA Posts: 3,563 Thanks: 656 Thanked 1,717 Times in 1,031 Posts Mentioned: 45 Post(s) Tagged: 3 Thread(s)	Can i get one made out of unobtanium? Seriously guys, there comes a point of diminishing returns.

11-22-2012, 04:40 PM	#9
dj petey Senior Member Join Date: Oct 2012 Drives: 2013 FR-S Location: Canada Posts: 107 Thanks: 8 Thanked 58 Times in 24 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	This is why he's gauging interest. No need to flame the guy for doing market research.

11-23-2012, 03:35 AM	#11
Gardus@Supersprint Banned Join Date: Nov 2011 Drives: Clio TCE Location: Mantova - Italy Posts: 494 Thanks: 17 Thanked 154 Times in 70 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Yes, I meant the headers in Inconel would be lighter than the SS one, sorry for the misunderstanding. Density (2°C) is 8.44 g/cm^3 vs 7.90 g/cm^3 of the Aisi 304 stainless steel we use. Titanium is around 4,5 @ 500°C: Tensile strength is 760 MPa vs 483 MPA Yield point (Rp0,2) is 290 vs 167 Basically you could make a 0.7/1 mm walls headers and still get a very resistant components. The obvious advantage is resistance to corrosion and oxidation, both compared to SS but much more compared to Ti. I guess a full system composed of an Inconel front part and a Ti rear part would be the best in terms of lightness and reliability.

11-23-2012, 04:21 AM	#12
robispec Senior Member Join Date: Oct 2012 Drives: Black frs project Location: Socal Posts: 960 Thanks: 189 Thanked 886 Times in 381 Posts Mentioned: 190 Post(s) Tagged: 1 Thread(s)	we made a 3.1 KG aluminum cat back for our race car and it survived 30 minute sessions quite well... 70 degree farenheit ambiant temps. Engine out, SS header transision pipe (the header can be used for NA SC or Turbo apps) over pipe and catted section weighed in (with the alu rear) at 9.1 KG complete. engine back.. time will tell on the durability. We are a chassis shop so we made the lightest part possible. The time attack car weights in @ 2505 with the full interior. you can just see the 2.5" aluminum muffler and tailpipe just peeking out i think SO I throw in SS to Aluminum into the light weight battle. rear view

11-23-2012, 05:52 AM	#13
Gardus@Supersprint Banned Join Date: Nov 2011 Drives: Clio TCE Location: Mantova - Italy Posts: 494 Thanks: 17 Thanked 154 Times in 70 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Aluminium is ok for catbacks if it doesn't need to last many years and loudness isn't much of an issue. Thinner stainless steel is a bit heavier but still ok. For road use (fit&forget, no drone etc) I stil would go for 1/1,5 mm s.s..

11-23-2012, 06:29 AM	#14
robispec Senior Member Join Date: Oct 2012 Drives: Black frs project Location: Socal Posts: 960 Thanks: 189 Thanked 886 Times in 381 Posts Mentioned: 190 Post(s) Tagged: 1 Thread(s)	agreed..we went only for light weight as our primary concern.

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