GTM Performance Engineering: MHI Twin Turbo Official Release

Nixlimited · 05-31-2013, 10:37 AM

Here's what I don't get: how is it that all of these factory turbocharged performance cars have cats that do not burn up? Is the issue that the aftermarket just does not have access to the higher quality / more resilient cats, or is it a price prohibition, or what?

puckshaw · 05-31-2013, 11:10 AM

Quote:

Originally Posted by Nixlimited

Here's what I don't get: how is it that all of these factory turbocharged performance cars have cats that do not burn up? Is the issue that the aftermarket just does not have access to the higher quality / more resilient cats, or is it a price prohibition, or what?

I was curious about this too. I ran HFCs on my old STi and never heard anyone having a failure or even being concerned about it. Either way, I'm going with test pipes but I'd still like to know why it's an issue on this platform.

Chuck33079 · 05-31-2013, 11:11 AM

Quote:

Originally Posted by puckshaw

I was curious about this too. I ran HFCs on my old STi and never heard anyone having a failure or even being concerned about it. Either way, I'm going with test pipes but I'd still like to know why it's an issue on this platform.

The cats on the STI are a lot further down stream from the turbo than on the Z. Heat is the issue, and the additional distance makes a huge difference.

puckshaw · 05-31-2013, 11:18 AM

Quote:

Originally Posted by Chuck33079

The cats on the STI are a lot further down stream from the turbo than on the Z. Heat is the issue, and the additional distance makes a huge difference.

That was the only thing I could think of. I believe the FI 3" exhaust which is made for turbo applications even has HFCs in it but they're much farther down stream. I guess if someone is determined/required to run cats, that would be a good option. I may go that route later down the road if my inspections don't go as planned.

Chuck33079 · 05-31-2013, 11:39 AM

Quote:

Originally Posted by puckshaw

That was the only thing I could think of. I believe the FI 3" exhaust which is made for turbo applications even has HFCs in it but they're much farther down stream. I guess if someone is determined/required to run cats, that would be a good option. I may go that route later down the road if my inspections don't go as planned.

I've got the catted FI 3". The cats are several feet away from the turbos. They should hold up fine.

SAM@GTM · 06-03-2013, 12:54 PM

Quote:

Originally Posted by puckshaw

I was curious about this too. I ran HFCs on my old STi and never heard anyone having a failure or even being concerned about it. Either way, I'm going with test pipes but I'd still like to know why it's an issue on this platform.

Quote:

Originally Posted by Chuck33079

The cats on the STI are a lot further down stream from the turbo than on the Z. Heat is the issue, and the additional distance makes a huge difference.

The reason the aftermarket STi cats don't fail is quite simple. They are designed for the application. Mounting the cats farther away is actually a bad thing and shortens the life of the cat since it needs heat to do its job. The better Subaru Downpipes use correct cats and mount them in the factory location right after the turbo outlet. The HFC's currently on the market for this car are NOT designed to handle Forced Induction.

We will be offering high flow cats as part of our new modular downpipe design. These cats are designed specifically for high horsepower, forced induction applications. In fact, we are so confident in their performance that we will be offering a warranty against failure.

The HFC's we will be offering are for our 3" downpipes with external wastegates as an option. You can also swap to 3" test pipes for track days if you like since they are bolted pieces. This new option is a great way for people to go that want 500whp and still have clean exhaust. Also, these cats will keep emissions down just as well as the stock cats, but have more flow and stand up to higher exhaust temps with richer air/fuel mixtures.

Sam

Nixlimited · 06-03-2013, 12:58 PM

Quote:

Originally Posted by SAM@GTM

The reason the aftermarket STi cats don't fail is quite simple. They are designed for the application. Mounting the cats farther away is actually a bad thing and shortens the life of the cat since it needs heat to do its job. The better Subaru Downpipes use correct cats and mount them in the factory location right after the turbo outlet. The HFC's currently on the market for this car are NOT designed to handle Forced Induction.

We will be offering high flow cats as part of our new modular downpipe design. These cats are designed specifically for high horsepower, forced induction applications. In fact, we are so confident in their performance that we will be offering a warranty against failure.

The HFC's we will be offering are for our 3" downpipes with external wastegates as an option. You can also swap to 3" test pipes for track days if you like since they are bolted pieces. This new option is a great way for people to go that want 500whp and still have clean exhaust. Also, these cats will keep emissions down just as well as the stock cats, but have more flow and stand up to higher exhaust temps with richer air/fuel mixtures.

Sam

It makes sense to test these on my car

gbrettin · 06-03-2013, 03:48 PM

So... What you are saying is that everyone should run open dumps.

Quote:

Originally Posted by SAM@GTM

The reason the aftermarket STi cats don't fail is quite simple. They are designed for the application. Mounting the cats farther away is actually a bad thing and shortens the life of the cat since it needs heat to do its job. The better Subaru Downpipes use correct cats and mount them in the factory location right after the turbo outlet. The HFC's currently on the market for this car are NOT designed to handle Forced Induction.

We will be offering high flow cats as part of our new modular downpipe design. These cats are designed specifically for high horsepower, forced induction applications. In fact, we are so confident in their performance that we will be offering a warranty against failure.

The HFC's we will be offering are for our 3" downpipes with external wastegates as an option. You can also swap to 3" test pipes for track days if you like since they are bolted pieces. This new option is a great way for people to go that want 500whp and still have clean exhaust. Also, these cats will keep emissions down just as well as the stock cats, but have more flow and stand up to higher exhaust temps with richer air/fuel mixtures.

Sam

SPOHN · 06-03-2013, 03:59 PM

Quote:

Originally Posted by gbrettin

So... What you are saying is that everyone should run open dumps.

Real men do.

megalapagas · 06-03-2013, 04:36 PM

WOOO! i just sent my email to mike, Twin turbos You Shall be mine Pretty Soon!!

P.S: I have a F.I 2.5" Exhaust System with R.T.P on its way, can it be connected with this turbo kit?

conmam · 06-06-2013, 01:33 AM

Quote:

Originally Posted by SAM@GTM

The reason the aftermarket STi cats don't fail is quite simple. They are designed for the application. Mounting the cats farther away is actually a bad thing and shortens the life of the cat since it needs heat to do its job. The better Subaru Downpipes use correct cats and mount them in the factory location right after the turbo outlet. The HFC's currently on the market for this car are NOT designed to handle Forced Induction.

We will be offering high flow cats as part of our new modular downpipe design. These cats are designed specifically for high horsepower, forced induction applications. In fact, we are so confident in their performance that we will be offering a warranty against failure.

The HFC's we will be offering are for our 3" downpipes with external wastegates as an option. You can also swap to 3" test pipes for track days if you like since they are bolted pieces. This new option is a great way for people to go that want 500whp and still have clean exhaust. Also, these cats will keep emissions down just as well as the stock cats, but have more flow and stand up to higher exhaust temps with richer air/fuel mixtures.

Sam

Sam,

When will you offer these high power forced induction cats ( Without external wastegate ) ? I hope very soon.

05-31-2013, 10:37 AM	#1 (permalink)
Nixlimited A True Z Fanatic Join Date: Aug 2009 Location: San Diego Posts: 1,235 Drives: 15 GT-R / 11 Prius Rep Power: 26	Here's what I don't get: how is it that all of these factory turbocharged performance cars have cats that do not burn up? Is the issue that the aftermarket just does not have access to the higher quality / more resilient cats, or is it a price prohibition, or what? __________________ Car Sold! Pleasure being a part of the Z community. New ride: 2015 GT-R - 647 WHP / 641 WTQ (e85) & 543 WHP / 519 WTQ (91)

06-03-2013, 04:36 PM	#10 (permalink)
megalapagas Enthusiast Member Join Date: May 2013 Location: McAllen,TX Posts: 457 Drives: '10 370Z Tour A/T Rep Power: 12	WOOO! i just sent my email to mike, Twin turbos You Shall be mine Pretty Soon!! P.S: I have a F.I 2.5" Exhaust System with R.T.P on its way, can it be connected with this turbo kit? Last edited by megalapagas; 06-03-2013 at 04:38 PM.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
GTM Performance Engineering 370Z SUPERCHARGER KIT PRESS RELEASE	SAM@GTM	Forced Induction	1161	02-16-2014 08:21 PM
GTM Performance Engineering: Mild 7 A/T Twin Turbo Build	SAM@GTM	Forced Induction	37	12-11-2013 12:23 PM
GTM Performance Engineering: 370Z MHI Twin Turbo Pre-Release	SAM@GTM	Forced Induction	120	09-06-2013 06:21 PM
GTM Performance Engineering stage 2 600hp supercharger kits line-up press release	SAM@GTM	Forced Induction	305	09-27-2012 03:23 PM