38mm wastegate - rated HP??

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bazeng

Gday maaaate
Joined
Apr 2, 2005
Messages
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Location
Melbourne
hey guys
just wondering what the tial 38mm wastegate is actually rated at..
im getting major boost creep
not sure if its the manifold or wastegate size...
boost creeps from 1bar at 3000rpm to 1.8bar at 7500rpm...
controlled either by the electronic valve or by nothing it still results in the same thing...

thanks guys..
 
i can't find any info regarding the limits of the Tial gate, but the equivalent 38mm turbosmart gate is rated to 600hp, so I'm guessing the Tial would be the same.

Is it possible that because you're running the 0.63A/R housing that you are getting a lot more exhaust gas going through the wastegate compared to a 2.0L motor and it can't cope?
 
actually, i just read this:

taken from http://www.slowboyracing.com/more.php?id=2360&

Turbosmart has successfully used one Ultra-Gate on engines producing up to 600HP, however in applications where the turbo is not suitably matched to the engine, this figure may not be achievable. Customers have found however that the wastegate is very effective to 400 horsepower for the more normal application.
 
I remember reading that the Tial 38mm are rated to 550hp. From Turbonetics website as a comparison: External wastegates from Turbonetics are available from 32mm, 38mm, and 42mm or above. Depending on your engine output, there is a Turbonetics wastegate to suit. The 32mm Deltagate is good for 350+bhp; 35mm will flow up to 450bhp and 42mm Racegate will hold over 900bhp.
 
guess what? i can have a 38mm gate thats only rated to 200hp :? if its installed badly.

its not only the wastegates size that affects how much exhaust flow it can divert. the biggest most important bit, is where the gate is located, how it is installed.

i've seen friends using 45mm wastegates on stock evo manifolds and still experiencing creep.

mainly due to the fact stock manifold not providing any good locations to split the exhaust stream before the turbo.

usally they are mounted above the collector, think about the exhaust gases flowing into the turbo, the gases dont like making a 90deg turn to flow out the wastegate when its easier to flow through the compressor housing.

that reduces the effectiveness of the wastegate, requiring a larger sized wastegate to perform the same job.

i've also seen aftermarket manifolds that have questionable wastegate locations.

i dont know why i just wrote that, lol

p.s. i wouldnt mind that tial 8)
 
You cant actually determine a wastegates hp flow capability by its size.

I believe the problem you have here is first and foremost wastegate placement. The best place for the gate, if you plan on moving it, is directly off the turbine housing, but most people do not wish to cut/weld the housing, so thats usually out. Next best would be to collectively merge the gate from where all four pipes merge, and in the same direction as the exhaust flow. That way the exhausted gas does not take an easier route. While exhaust gas will flow to the gate side due the pressure differential regardless of placement, having it as efficient as possible for boost control requires it to be instream with exhaust flow.

A larger gate, offering a greater pressure differential will probably work in the same location, but this cannot be guaranteed.
 
off topic..
how much hp are stock td05 16g wastegates good for?
im gettin boost creep as well..
i don't know if it was my wastegate which was not secure before but since it has been secure and fixed i'm boosting more then i should with my avcr.. could that be the reason that my avcr was tuned with the loose wastegate thus now it boost more?
 
My 16G creept when all it had was a pod and 3" cat-back. So probably not much more than stock (unless your fine with running boost no lower than 1-1.1 bar :) )
 
like i said previously, i've got a manifold which has the gate placement on a pretty bad place (the 1st runner!!!).. and only the first runner...

i believe it could be that, but i spole to others with the same manifold and they seem to be able to be holding boost fine...

rob barac was able to hold at 25psi minimum with something like 330kw's at the wheels .., but we've discussed it and have come up with the problem probably due to the engine setup rather than the turbo..

i might try top tap another spot off the exhaust housing.. get 2 ports going to the wastegate instead...
 
they are quite good,

some people argue that they are one best places to put them.

my theory with MHI exhaust housings espeacially, is its not so much the wastegate size which is the issue, but the passage into the gate from the collector which is the biggest issue.

IF you do it, make sure they smooth the collector into th gate, makes the world of difference.

like in this picture, see the step into the gate in the top turbo compared to the standard turbo at the bottom

t-28portedwitht-25.jpg


speaking from personal expience.
 
EVO-00X said:
matress said:
what do you guys think about running the wastegate off the dump pipe?
Not the best as you want it to vent before the turbine wheel not after it.

it is before the turbine.

edit: i see what matress wrote, even though he said "dump pipe" im sure he was meaning, adding an external in the stock wastegate location.

well atleast thats what his link was about and thats the way i read it :wink:
 

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