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GTM Performance Engineering: MHI Twin Turbo Official Release

God bless Florida...at least we do cars right with no emissions or stupid car related laws. ^^

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Old 06-01-2013, 10:04 PM   #811 (permalink)
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God bless Florida...at least we do cars right with no emissions or stupid car related laws. ^^
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Old 06-01-2013, 10:07 PM   #812 (permalink)
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God bless Florida...at least we do cars right with no emissions or stupid car related laws. ^^
Yeah but you have to deal with all the retired old bags driving around your pretty car.
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Old 06-02-2013, 01:18 PM   #813 (permalink)
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Look like I will have to sell my HFC, get a TP and hoping it wont be too loud with the turbos. I wound not want to wake my neighbors when I go to work at 5am every morning :-)
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Old 06-02-2013, 02:05 PM   #814 (permalink)
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With turbo applications the car is actually quieter

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Old 06-02-2013, 02:12 PM   #815 (permalink)
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He's right it will if fact be ALOT quieter. Im running the gtm 3' test pipes with the stillen exhaust and it completely took the noise away other just a deep sounding tone..


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With turbo applications the car is actually quieter

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Old 06-02-2013, 11:20 PM   #816 (permalink)
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Thats good to kniw. Now I am just waiting for the installation manual to see if I can do it in my garage with jack stands.
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Old 06-02-2013, 11:24 PM   #817 (permalink)
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Will there be a installation manual for installing this kit with the engine still in the bay?
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Old 06-03-2013, 12:05 AM   #818 (permalink)
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Hey Mike or Sam, how long until the test results on Nxlimited's car? His car has the 16G with EWG ? I like the results from the GTM TT TDO5 with the IWG but think the EWG will be better, and will be a better fit for me later if I want to urgrade to Garrett Turbos.
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Old 06-03-2013, 06:44 AM   #819 (permalink)
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Thats good to kniw. Now I am just waiting for the installation manual to see if I can do it in my garage with jack stands.
It can be done for there a several guys here that have.
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Will there be a installation manual for installing this kit with the engine still in the bay?
I think it will be done with a engine out. This way it clearly shows what you have to do. Course it going to be a little harder and more compact in the engine bay. The hardest part IMO with the engine still in the car is going to be mounting the turbo.
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Old 06-03-2013, 07:50 AM   #820 (permalink)
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Anybody know if we can unbolt the header from the top/bottom and pull it out thru the top? If it must come thru the bottom then we'll probably have to disassemble some of the front suspension I'm guessing.
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Old 06-03-2013, 10:55 AM   #821 (permalink)
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Anybody know if we can unbolt the header from the top/bottom and pull it out thru the top? If it must come thru the bottom then we'll probably have to disassemble some of the front suspension I'm guessing.
It will have to come out threw the bottom. On the drivers side you wil have to unbolt the steering knuckle.
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Old 06-03-2013, 10:58 AM   #822 (permalink)
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It will have to come out threw the bottom. On the drivers side you wil have to unbolt the steering knuckle.
Yeah, it's one bolt then you can slide the steering shaft up towards the firewall, it'll collapse in on itself and stay out of the way until you're ready to re-attach it.

Oh, and be sure not to turn your steering wheel while it is detached. You'll mess up your steering position sensor's reference range and have to detach the shaft again and re-set it to centered.

(Gutted folks like Spohn and I don't need to worry about this as we've already ditched that sensor)
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Old 06-03-2013, 01:54 PM   #823 (permalink)
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Originally Posted by puckshaw View Post
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.
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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
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Old 06-03-2013, 01:58 PM   #824 (permalink)
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Originally Posted by SAM@GTM View Post
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
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Old 06-03-2013, 04:48 PM   #825 (permalink)
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So... What you are saying is that everyone should run open dumps.

Quote:
Originally Posted by SAM@GTM View Post
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
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