gt2871r .64 with external wastegate: Worthwile project or expensive mistake? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

codyace · 04-26-2005, 11:12 AM

I don't intend this to be a discussion of how each works, as I understand both pro and cons of each setup...

On my Altima, I run an external gate that is atmospherically dumped - which is fine by my standards for the altima...

HOWEVER

On my s14 project, I was planning on running with a gt2871r .64 trim turbocharger with an internal wastegate?

My question/concern deals with the reliablity of the aftermarket turbo's wastegate being 'up to snuff' with the rigors of 16 - 20 psi spirited driving...

Will I be better of researching and implementing an external gate into my setup, or should I be content with the internally gated 2871???

Any personal experience is more than welcomed!!

Pictures as well if there are any out there (on t 28 based setups...)

Thanks again!

wootwoot · 04-26-2005, 02:25 PM

An external wastegate can be modified onto the stock manifold. It is not that much harder and is the route I'm going for all of the pro's you allready know. If you do the whole internal wastegate thing there is some fabrication and extra parts needed for that so you might as well save it and get something better.

ultraDorksGarage · 04-26-2005, 02:58 PM

truth be told, the higher the boost, the less "wastegate" ull need.

the fact that if the actuator is sprung for too little boost might give your boost controller some minor inefficiencies, but really u should only think about the efficiency lost at the dump pipe, and seperated dump elbows are readily available.

why is this important? if u run enough boost, where integral wastegate doesnt allow boost creep, external wastegate on a crappy designed manifold will make u lose power. think of it this way, garrret/hks engineered that wastegate to flow evenly, with minimal change to flow directions of turbine flow, on a homemade external system, placement of gate will reverse or stall exhaust flow, causing crap boost response as well as less flow potential during wastegate operation.

another problem is u might drop one specific cylinder temp. if u pull a pulse out of a single cylinder rather than all four, ull get varying egt's, which is very hard to tune.

*fliprayzin240sx* · 04-26-2005, 09:02 PM

Doesnt the GT2871R come with adjustable HKS internal wastegate? As far as i know this is up par for this set up.

codyace · 04-27-2005, 01:04 PM

I'm not sure of the HKS internal wastegate coming with the turbo itself...Im not doubting, it's just somethign that I had never heard before (actually now i'm even more looking forward to having it on there if it's part of the setup!!)

Thanks for the responses guys...I never really took into account that a poorly designed exernal gate setup will obvioulsy lower performance, albiet slightly...I think I'll just keep what works well intact and use the internal gate!!

-Ace

04-26-2005, 11:12 AM	#1
codyace Post Whore! Join Date: Dec 2004 Location: Poconos, PA Age: 36 Posts: 8,030 Trader Rating: (58) Feedback Score: 58 reviews	gt2871r .64 with external wastegate: Worthwile project or expensive mistake? I don't intend this to be a discussion of how each works, as I understand both pro and cons of each setup... On my Altima, I run an external gate that is atmospherically dumped - which is fine by my standards for the altima... HOWEVER On my s14 project, I was planning on running with a gt2871r .64 trim turbocharger with an internal wastegate? My question/concern deals with the reliablity of the aftermarket turbo's wastegate being 'up to snuff' with the rigors of 16 - 20 psi spirited driving... Will I be better of researching and implementing an external gate into my setup, or should I be content with the internally gated 2871??? Any personal experience is more than welcomed!! Pictures as well if there are any out there (on t 28 based setups...) Thanks again! __________________ *Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20!* Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy

04-26-2005, 02:25 PM	#2
wootwoot Post Whore! Join Date: Jan 2004 Location: sarasota florida biatch Age: 35 Posts: 3,850 Trader Rating: (0) Feedback Score: 0 reviews	An external wastegate can be modified onto the stock manifold. It is not that much harder and is the route I'm going for all of the pro's you allready know. If you do the whole internal wastegate thing there is some fabrication and extra parts needed for that so you might as well save it and get something better. __________________ I'm from Florida so I'm probably a bit more strange than you

04-26-2005, 09:02 PM	#4
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	Doesnt the GT2871R come with adjustable HKS internal wastegate? As far as i know this is up par for this set up. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

04-27-2005, 01:04 PM	#5
codyace Post Whore! Join Date: Dec 2004 Location: Poconos, PA Age: 36 Posts: 8,030 Trader Rating: (58) Feedback Score: 58 reviews	I'm not sure of the HKS internal wastegate coming with the turbo itself...Im not doubting, it's just somethign that I had never heard before (actually now i'm even more looking forward to having it on there if it's part of the setup!!) Thanks for the responses guys...I never really took into account that a poorly designed exernal gate setup will obvioulsy lower performance, albiet slightly...I think I'll just keep what works well intact and use the internal gate!! -Ace __________________ *Want Air Conditioning in your SR20 Swapped car? Check out www.sr20acbrackets.com for more information! Quest Alternator Conversions for SR20!* Check my Group Buy! Tired of lousy internal gates? Go external wastegate with one of my manifolds, Check out my group buy

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04-26-2005, 02:58 PM	#3
ultraDorksGarage Zilvia Member Join Date: Mar 2005 Location: Hawaii Posts: 204 Trader Rating: (0) Feedback Score: 0 reviews	truth be told, the higher the boost, the less "wastegate" ull need. the fact that if the actuator is sprung for too little boost might give your boost controller some minor inefficiencies, but really u should only think about the efficiency lost at the dump pipe, and seperated dump elbows are readily available. why is this important? if u run enough boost, where integral wastegate doesnt allow boost creep, external wastegate on a crappy designed manifold will make u lose power. think of it this way, garrret/hks engineered that wastegate to flow evenly, with minimal change to flow directions of turbine flow, on a homemade external system, placement of gate will reverse or stall exhaust flow, causing crap boost response as well as less flow potential during wastegate operation. another problem is u might drop one specific cylinder temp. if u pull a pulse out of a single cylinder rather than all four, ull get varying egt's, which is very hard to tune.