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Location:
Adelaide
Registered:
May 2002
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which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 04:01
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ok, I am thinking about turbo-ing a 2tg, I currently have a 3t/2tg hybrid engine, with very high c/r so boosting that would not be too good an idea...I already have the efi side of things taken care of, I am already using 2tg EFI manifold with 3tgte injectors and Microtech MT-4 ECU...
which series or model number/head number woiuld be the ideal 2tg to use to run approx. 10-15psi boost using this efi and CT20 turbo ?! ideas and thoughts ?!
Brendon
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Club President
I supported Toymods
Location:
Sydney
Registered:
May 2002
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 Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 07:04
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Brendon,
Any 2TG head will be ok as long as you keep things low on boost as compression increases. Being EFI you will want an 88260 or 88261 head. (The 88262 head needs special piston considerations and is a real unknown as to its flow capabilities)
Personally I am useing the 88261 head as it was the later of the 2 readily known EFI heads.
Compression levels were taken care of by the pistons so it doesn't realy mater what the stock compression was of the head you end up with.
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Registered:
May 2002
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Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 07:38
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Rod, not sure if you would be able to tell me but just out of curiousity with a C/R of about 8.4:1 how much more boost could be run reliably if i were to use a thick (80thou) copper head gasket? just wondering if they are all they are cracked up to be.
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Location:
Adelaide
Registered:
May 2002
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Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 08:19
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wouldn't any 2tg head be able to put efi on it ?! just have to "file" out some injector relief thingies ?!
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Location:
Adelaide
Registered:
May 2002
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Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 08:21
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Don't HiJack my post there young fella..... ! haha
so you going to give me the copper gasket too ?!
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Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 10:51
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I have a 3tgt exhaust manifold in the shed if you want it.
$180 and its yours. (Supposedly woth over 200)
Matt
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Location:
Hornsby, N.S.W
Registered:
September 2002
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Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 12:40
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mat you can get a ct26 and manifold for $500
justin 
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Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 13:07
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ct26 and manifold for what ??
it was Rod who told me that value, I only had it offered at half that before.
open to offers. atm its just taking up space in my small shed.
Matt
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Location:
Perth
Registered:
May 2003
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Re: which 2TG model to use to TURBO ?! ATTN - ROD TRY ?!
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Tue, 17 June 2003 14:24
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Sorry bout hijacking ur post again Snyper.
But in reply to inferno,
If you already know you comp ratio with the original gasket (say 40thou = 1mm) and you know the displacement (2TG?) then you can work out the current combustion chamber and head gasket volume and use this to recalculate the new comp ratio.
comp ratio = cylinder volume / (combustion chamber volume + head gasket volume)
The amount of reliable boost depends on intercooling and fuel richness levels among other things. Given that the engine is prevented from detonating, you should be able to run high boost (inexcess of 15PSI). Most toyota motors have a strong bottom end.
Decreasing comp by using copper head gaskets is not a good thing, better using dished pistons. Not only does the increased thickness expose more copper to the combustion process you are also playing with something called the squish height. The squish height is determined by the difference from the top of the piston at TDC to the bottom of the head face. It should be kept at a certain height (differs upon application) in order to work correctly. This is because squish greatly affects at what point the engine begins to detonate.
The copper gaskets will hold up ok provided you prevent detonation.
Snyper,
I have only seen a couple of different heads, the 88222 and 88261. The 88261 offers a better combustion chamber design that should promote increased swirl (more complete combustion). What power differences this would produce, I don't know.
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