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Location:
Terrigal
Registered:
May 2002
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Tial 38mm external gate options?
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Wed, 27 July 2005 06:17
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Hi all, i'm just working out the last few bits n pieces I need to complete my 3sgte rwd build up.
I've been debating what turbo to run for awhile now and while not the optimum, i'm going to use a greddy/trust td05-16g I have laying around. Could be a bit on the small side (320hp turbo i've heard), but its quite cheap and easy to upgrade it to a 18g compressor wheel down the track.
Anyhow this turbo requires an external wastegate..
What do people think of the tial 38mm gates? They are only around $200 US. Is 38mm large enough?
Cheers
Joel
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Location:
Canberra
Registered:
June 2003
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Re: Tial 38mm external gate options?
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Wed, 27 July 2005 06:21
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38mm should be plenty. I ran a TIAL on my White GT4 and it performed fine.
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Registered:
July 2005
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Location:
Canberra
Registered:
June 2003
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Re: Tial 38mm external gate options?
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Wed, 27 July 2005 07:02
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It is definitely NOT just as simple as 'bigger is better' with an external gate.
Just think what happens on a smaller turbined turbo when all the exhaust gases go straight out a large WG.....you lose all your energy and boost drops off. WG shuts, boost spools up and then WG opens and you lose all boost etc etc etc. A viscious cycle that brings on the worst surging you have ever seen. I ran a 45mm TIAL gate on the GT4 and it surged so bad it nearly bucked the car right off the dyno. I had to do some mods to the WG valve seat to vent the exhaust gases initially in a more controllable fashion.
You are right that at top end gas flow, running unneeded exhaust gas thru the WG instead of the turbine will net you some gains but correct sizing and design is required.
A 38mm gate will be more than enough for your needs Joel and with good design of the WG return pipe it won't hurt your perf at all but will give good amd simple boost control.
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Registered:
July 2005
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Re: Tial 38mm external gate options?
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Wed, 27 July 2005 07:58
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true 
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I supported Toymods
Location:
melbourne
Registered:
June 2002
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Re: Tial 38mm external gate options?
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Wed, 27 July 2005 08:43
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if you can, plumb the waste gate pipe seperate to the turbo dump pipe, as it will give you better boost control.
and use a muffler, screamers sound terrible.
see if you can get hold of maximum boost, it has a fair few good rules of thumb for such things.
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Registered:
July 2005
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Location:
Terrigal
Registered:
May 2002
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Re: Tial 38mm external gate options?
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Wed, 27 July 2005 23:17
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Thanks all for ya help as always!
I've got that Max boost book will re-visit it this weekend.
Cheers
Joel
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