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Location:
Melbourne
Registered:
May 2002
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Wastegate(s)
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Sat, 03 January 2004 13:21
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Ok say one wanted the best of both worlds like a turbo that boosted quickly yet did not restrict flow higher in the rev range would an enlarged wastegate Help... or maybe even a 2nd wastegate?
Paul?, Jamie? any ideas guys?
Allan
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Location:
Brisbane
Registered:
October 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 00:42
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i cant see how a bigger WG would help with boost response, is would help with boost control,
maybe a "quicker" {if possible  } wastegate so it opens slightly later to let more gas go thru the exh housing b4 it opens up and lets the air by pass
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Location:
Melbourne
Registered:
May 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 01:39
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From what i understand the turbine becomes a restriction to exhaust flow higher up in the rev range, thus remove that restriction by flowing more gas around it rather then cliping the turbine and losing the ability to spool up at lower revs
Allan
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Registered:
May 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 01:51
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if your wastegate wasn't flowing all the excess gas (excess is all gas beyond what's needed to get your max boost) then the boost would creep beyond that piont.
maybe look at better plumbing in the wastegate line? to give iut a smoother path around the turbine?
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Location:
Brisbane
Registered:
October 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 02:50
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there was a guy on there who sold a booth controller that allowed quicker spooling time and more controlled boost.
it opened the gate a bit later so it doesnt "waste" gas
ie. it started opening at 7psi, and stopped at 10
instead of 5 and 10
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Location:
Sydney
Registered:
May 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 02:54
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you guys arent answering what he asked..
he wants to no if fitting a large wastegate(external) which will flow really well will help.. now in my mental thinking.. it should aslong as the boost control is gated so that the gate stays closed aslong as posible.
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Location:
Brisbane
Registered:
October 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 03:10
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| Quote: |
From what i understand the turbine becomes a restriction to exhaust flow higher up in the rev range, thus remove that restriction by flowing more gas around it rather then cliping the turbine and losing the ability to spool up at lower revs
Allan
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but if u made the gas go round, that would drop boost, if u have the problem of boost spiking/creep, then u have a wastegate problem, then yes a bigger wastegate would be better,
it MAY not help with the quicker boost response but beter control
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you guys arent answering what he asked..
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i was telling him about the controller cause he asked about quicker boost response, that is a way
i think its celicamad, or celica boy or comething like that
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Location:
Melbourne
Registered:
May 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 03:28
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the controller will be a Motec so thats not an issue 
What bugman said 
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Location:
Brisbane
Registered:
February 2003
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Re: Wastegate(s)
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Sun, 04 January 2004 03:34
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| Allan wrote on Sat, 03 January 2004 23:21 |
Ok say one wanted the best of both worlds like a turbo that boosted quickly yet did not restrict flow higher in the rev range would an enlarged wastegate Help... or maybe even a 2nd wastegate?
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ball bearing turbo with large external wastegate.
ensure waste gas is plumbed into dump pipe to join gas flow (instead of interrupt) via a suitablely angled join hat encourages spiral gas flow- or dump straight to atmo if not streetable.
i think most high-horsepower turbos have external wastegate, otherwise you have gas flow problems/issues inside the housing and dump pipe with an integral wastegate.
Also, a boost controller (aka ceclicamad's or similar) that provides positive boost control but lets your monster ball-bearing turbo spool up quickly.
IMHO: 2 x wastegates may not act synchonously and would only complicate plumbing/exhausts for a single turbo
But ... if you're after a wider rev range of usable boost then maybe two turbos would be better? 'cause a big turbo (suited for upper rev range) will be not spool up quickly at lower revs?
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Wastegate(s)
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Sun, 04 January 2004 05:20
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Generally if you use a reasonable sized (45+mm) external gate, on a decent manifold, you won't have any issues. However, sometimes factory internal gates CAN tend to allow excessive pressure to build up before the turbo, which in itself limits boost. So what Allan said DOES sometimes make sense/apply. But use a decent external gate and you won't have any issues 
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Location:
North Sydney
Registered:
May 2002
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Re: Wastegate(s)
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Mon, 05 January 2004 04:20
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Definitly a larger wastegate will help, especially at the top end. Once the turbo has spun to your boost preset say 10psi and it could actually spin easily to 15psi at max rpm there's no reason to restrict that gas flow, let it rip baby and get some decent flow happening and gain the benefits.
Run a hefty external gate, 45mm+ plus as they say and run it to atmosphere, mine is and its not that loud and is only loud when your above 10psi which is like 1/500th of the time your driving.
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