GTM Performance Engineering: MHI Twin Turbo Official Release

esfourteen · 10-09-2013, 12:02 AM

Quote:

Originally Posted by Chuck33079

Yep. Other than cost, external is always better.

Every factory turbocharged car in the world comes with internal wastegates, for the obvious reasons of: cost, weight, and clearance/space issues, so aside from those, I would say its a good idea to run externals just because internals have certain limitations.

Since the volumetric efficiency of our engine is so high, I would say if you have the extra money just go external so you avoid any boost creep issues with our engine. However, claiming that external wastegates are safer and give "better power" (whatever that means) and more power is just a joke.

The biggest problem typically encountered with internal wastegates is controlling higher amounts of boost (> 20psi). Theres 2 reasons for that, first most factory actuator springs are in the range of 7-14psi, so with an EBC solenoid at max duty cycle (about 90%) that would mean a maximum of 14-28psi. The second issue is the size of the wastegate openings. Internally gated turbos wastegate opening is limited by the size of the turbine housing itself, external wastegates do not have this limitation. This is why the .64 AR suffers from creep issues while the .86 does not.

I currently run 15psi and have no issues holding that to redline on internal gates with .86 housings.

megalapagas · 10-08-2013, 06:36 PM

Quote:

Originally Posted by G37sHKS

Go with external wastegate. my boost gauge was reading 8.8 PSI while the internal wastegate spring was 7 PSI.

1.8 PSI of boost creep is a lot if you ask me. Im not so sure if going with .86 housing will eliminate the boost creep or will just minimize it (which is still not good)

So just to be in safe side. go with external wastegate. you will have better boost response, better flow, more power, and last but not least, it will extend the life of turbo.

Yes you heard me right it will extend the life of turbo and will give better power and more power.

Please watch this video to learn more about external and internal

Thx now I'm SET FOR SURE.

showme99 · 10-08-2013, 07:42 PM

Quote:

Originally Posted by G37sHKS

Go with external wastegate. my boost gauge was reading 8.8 PSI while the internal wastegate spring was 7 PSI.

1.8 PSI of boost creep is a lot if you ask me. Im not so sure if going with .86 housing will eliminate the boost creep or will just minimize it (which is still not good)

So just to be in safe side. go with external wastegate. you will have better boost response, better flow, more power, and last but not least, it will extend the life of turbo.

Yes you heard me right it will extend the life of turbo and will give better power and more power.

Please watch this video to learn more about external and internal

Very informative video. Thanks for sharing.

Mr.Squeeze · 10-09-2013, 09:27 AM

Quote:

Originally Posted by G37sHKS

Go with external wastegate. my boost gauge was reading 8.8 PSI while the internal wastegate spring was 7 PSI.

1.8 PSI of boost creep is a lot if you ask me. Im not so sure if going with .86 housing will eliminate the boost creep or will just minimize it (which is still not good)

So just to be in safe side. go with external wastegate. you will have better boost response, better flow, more power, and last but not least, it will extend the life of turbo.

Yes you heard me right it will extend the life of turbo and will give better power and more power.

Please watch this video to learn more about external and internal

Nice video

For the amount of money that is spent on a turbo kit especially your going to upgrade down the line witch at some point we all do. It is just better to get the External Gates and not have to deal with the issue that come along with internal gates.

Chuck33079 · 10-09-2013, 09:30 AM

Quote:

Originally Posted by Mr.Squeeze

For the amount of money that is spent on a turbo kit especially your going to upgrade down the line witch at some point we all do. It is just better to get the External Gates and not have to deal with the issue that come along with internal gates.

Exactly. Don't paint yourself into a corner right off the bat.

Dzel · 10-08-2013, 09:56 PM

How much is it for external $400.00 more I'm guessing?

That video was very informative. Thanks x

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puckshaw · 10-10-2013, 07:55 PM

I talked to Mike today and he said not to worry about boost creep with the .84 A/R and internal wastegates. I'm sticking with that setup.

Dzel · 10-10-2013, 08:55 PM

Yeah but that's only if you want to stay under say 550 hp. Anything more and you ARE going to need to go external.

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puckshaw · 10-10-2013, 09:04 PM

Quote:

Originally Posted by Dzel

Yeah but that's only if you want to stay under say 550 hp. Anything more and you ARE going to need to go external.

Sent with TapAhoe now Free

Not necessarily but I won't be going for those power levels either way.

09nismo498 · 10-10-2013, 09:05 PM

im going internal wastegates as well. im staying around 500hp, then when the need for more speed comes about, ill buy a gtr

BlkNismo · 10-11-2013, 12:23 AM

Is the GTX2860 an upgradable option? Would this be a beneficial upgrade over the standard GT2860?

SPOHN · 10-11-2013, 05:59 AM

Quote:

Originally Posted by BlkNismo

Is the GTX2860 an upgradable option? Would this be a beneficial upgrade over the standard GT2860?

It would be for sure. I've thought about that too.

Alstann · 10-11-2013, 10:31 AM

Quote:

Originally Posted by SPOHN

It would be for sure. I've thought about that too.

If I'm right with my somewhat limited knowledge, I would think the GTX-series, especially at our low boost applications, wouldn't be a crazy huge upgrade. I think the GTX-series would improve transient response, but as for efficiency, we would probably see no difference at the 8-11psi range, really.

esfourteen · 10-13-2013, 01:22 PM

Quote:

Originally Posted by BlkNismo

Is the GTX2860 an upgradable option? Would this be a beneficial upgrade over the standard GT2860?

theres virtually no benefits in upgrading to the GTX on the stock engine, look at the compressor maps. the gt2860 is good for about 580-620whp @ 18-20psi on pump gas with our engine, you could run a bit more boost with meth or e85 but its starting to overspin the turbo and will shorten its life.

if you were planning on running more than 20psi, thats when the GTX really shines, on our engine you could easily run 25-28psi on those turbos without going past its efficiency range, they are good for about 650-680whp. its like getting the response of a gt2860 with the top end of a gt2871r.

Jayhovah · 10-13-2013, 10:08 AM

Is everyone going to go Uprev? I'd like to go ecutek just to save a couple bucks on EBC if I can. What are the rest of you turn-key customers going to choose?

Can't wait to see these kits coming out and getting installed! Going to be a flood of dyno charts coming on here when this thing starts shipping.

10-08-2013, 09:56 PM	#6 (permalink)
Dzel A True Z Fanatic Join Date: May 2011 Location: Midland, TX Posts: 3,884 Drives: 11 370Z PW M6 Rep Power: 25	How much is it for external $400.00 more I'm guessing? That video was very informative. Thanks x Sent with TapAhoe now Free __________________ 10secWS6 IF YOU CAN'T SWING IT THEN DON'T BRING IT! Check out Domestic Performance C.C.

10-10-2013, 08:55 PM	#8 (permalink)
Dzel A True Z Fanatic Join Date: May 2011 Location: Midland, TX Posts: 3,884 Drives: 11 370Z PW M6 Rep Power: 25	Yeah but that's only if you want to stay under say 550 hp. Anything more and you ARE going to need to go external. Sent with TapAhoe now Free __________________ 10secWS6 IF YOU CAN'T SWING IT THEN DON'T BRING IT! Check out Domestic Performance C.C.

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10-10-2013, 07:55 PM	#7 (permalink)
puckshaw Track Member Join Date: Nov 2009 Location: Charlotte, NC Posts: 620 Drives: 09 PW 370Z Touring Rep Power: 18	I talked to Mike today and he said not to worry about boost creep with the .84 A/R and internal wastegates. I'm sticking with that setup.

10-10-2013, 09:05 PM	#10 (permalink)
09nismo498 Base Member Join Date: Sep 2010 Location: Chicago burbs Posts: 207 Drives: 14 GTR Rep Power: 17	im going internal wastegates as well. im staying around 500hp, then when the need for more speed comes about, ill buy a gtr

10-11-2013, 12:23 AM	#11 (permalink)
BlkNismo Track Member Join Date: Sep 2011 Location: USA Posts: 614 Drives: Nismo Rep Power: 16	Is the GTX2860 an upgradable option? Would this be a beneficial upgrade over the standard GT2860?

10-13-2013, 10:08 AM	#15 (permalink)
Jayhovah Premium Member Join Date: May 2013 Location: St. Pete, FL Posts: 3,848 Drives: 520whp Fire Breather Rep Power: 86953	Is everyone going to go Uprev? I'd like to go ecutek just to save a couple bucks on EBC if I can. What are the rest of you turn-key customers going to choose? Can't wait to see these kits coming out and getting installed! Going to be a flood of dyno charts coming on here when this thing starts shipping.