GTM Performance Engineering: MHI Twin Turbo Official Release

Alstann · 06-01-2013, 10:04 PM

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

Baer383 · 06-01-2013, 10:07 PM

Quote:

Originally Posted by Alstann

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.

khanhvu411 · 06-02-2013, 01:18 PM

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 :-)

Dzel · 06-02-2013, 02:05 PM

With turbo applications the car is actually quieter

Sent with TapAhoe

COSMO · 06-02-2013, 02:12 PM

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..

Quote:

Originally Posted by Dzel

With turbo applications the car is actually quieter

Sent with TapAhoe

khanhvu411 · 06-02-2013, 11:20 PM

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.

Cell · 06-02-2013, 11:24 PM

Will there be a installation manual for installing this kit with the engine still in the bay?

plumber dude · 06-03-2013, 12:05 AM

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.

SPOHN · 06-03-2013, 06:44 AM

Quote:

Originally Posted by khanhvu411

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.

Quote:

Originally Posted by Cell

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.

Footloose301 · 06-03-2013, 07:50 AM

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.

SPOHN · 06-03-2013, 10:55 AM

Quote:

Originally Posted by Footloose301

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.

Sh0velMan · 06-03-2013, 10:58 AM

Quote:

Originally Posted by SPOHN

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)

SAM@GTM · 06-03-2013, 01:54 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, 01:58 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, 04:48 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

06-01-2013, 10:04 PM	#811 (permalink)
Alstann Track Member Join Date: Oct 2011 Location: South Florida Posts: 882 Drives: 12 PW 370z 6MT Sport Rep Power: 15	God bless Florida...at least we do cars right with no emissions or stupid car related laws. ^^ Footloose301 and elperuano like this. __________________ 2012 Pearl White 370Z GReddy Twin Turbo

06-02-2013, 02:05 PM	#814 (permalink)
Dzel A True Z Fanatic Join Date: May 2011 Location: Midland, TX Posts: 3,884 Drives: 11 370Z PW M6 Rep Power: 23	With turbo applications the car is actually quieter Sent with TapAhoe __________________ 10secWS6 IF YOU CAN'T SWING IT THEN DON'T BRING IT! Check out Domestic Performance C.C.

06-03-2013, 07:50 AM	#820 (permalink)
Footloose301 A True Z Fanatic Join Date: Apr 2010 Location: Naples, FL Posts: 2,659 Drives: 40th Rep Power: 21	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. __________________ 2010 40th Anniversary 370Z

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06-02-2013, 01:18 PM	#813 (permalink)
khanhvu411 Base Member Join Date: Sep 2012 Location: houston Posts: 144 Drives: 2010 370z Roadster Rep Power: 13	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 :-)

06-02-2013, 11:20 PM	#816 (permalink)
khanhvu411 Base Member Join Date: Sep 2012 Location: houston Posts: 144 Drives: 2010 370z Roadster Rep Power: 13	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.

06-02-2013, 11:24 PM	#817 (permalink)
Cell A True Z Fanatic Join Date: Jan 2010 Location: Chicago Posts: 1,449 Drives: A Garbage Truck Rep Power: 21	Will there be a installation manual for installing this kit with the engine still in the bay?

06-03-2013, 12:05 AM	#818 (permalink)
plumber dude Base Member Join Date: Sep 2012 Location: Lacey WA Posts: 57 Drives: 09 370z T/S Blk M6 Rep Power: 13	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.