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Registered:
May 2002
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3TGTE running NA
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Wed, 15 January 2003 04:54
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I've almost finished rebuilding a 3TG, and been told that boost is bad for a recently rebuilt engine (at least untill 1000ks).
Can I run a stock standard 3TGTE without the turbo, just straight to the extractors? I'll run the AFM straight off the throttle, and block off the water and oil lines that go to and from the turbo. I'm also thinking of doing this until I get rego/brakes sorted so it may be awhile before I run boost with the engine. Will this kill my valves etc? I know the low compression would mean bad performance.
Also contemplating using a 4AGZE supercharger, will the standard computer need reprogramming?
Cheers
Robert
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Location:
Brisbane
Registered:
May 2002
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Re: 3TGTE running NA
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Wed, 15 January 2003 05:47
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Just wire the wastegate open and don't load up the engine too much; the turbo won't come on boost much if at all. Careful not to go too easy during the running-in period, otherwise the rings won't bed in properly.
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I supported Toymods
Location:
Perth, Western Australia
Registered:
December 2002
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Re: 3TGTE running NA
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Wed, 15 January 2003 11:06
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yep, you can run without the turbo. Block the oil line from the back of the thermostat housing, and water lines too. A standard 2T/3T exh manifold will bolt up.
The supercharger is an option I thought about for that motor, but location and fitment made me think twice about doing it!. The standard computer shouldn't need any "tinkering" as it simply reads boost and supplies more fuel above 0.5psi - doesn't matter where the boost comes in.
Clint!
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Registered:
May 2002
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Re: 3TGTE running NA
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Wed, 15 January 2003 13:30
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cheers fellas. I called someone who races them over here, he told me without the turbo on a 3TGTE to suck the air from my exhaust there would be too much backpressure, and the engine wouldn't idle and possibly kill my valves (same effect as a blown exhaust gasket on an NA engine). I think he must have been talking about a 3TGTE with lower compression, but he has got a point that the stock cams/valves/compression is setup for some suction from the turbo. He mentioned something about a blow off valve to release the pressure(??). Maybe if I replaced the exhaust cam with a standard 2TGEU cam????
I didn't want the turbo manifold on there at all as I doubt cops/rego would believe I have the turbo connected but not boosting 
good to hear about the blower, the 3TG block is close enough to a 2TGEU block to follow Tim Frosts air conditioner mount trick.
http://www.fortunecity.com/silverstone/toyota/80/t echnical/2t-gze.html
I would love to see how a supercharged 3TGTE would go like!
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Location:
Brisbane
Registered:
May 2002
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Re: 3TGTE running NA
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Thu, 16 January 2003 00:26
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Um, the turbo doesn't create "suction" in the exhaust at all. The bloke you were speaking to apparently doesn't understand how a turbo works!
The only difference in the engine itself is shorter duration cams and lower compression ratio; you're not going to cause any damage whatsoever running this engine without a turbo attached.
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Registered:
May 2002
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Re: 3TGTE running NA
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Thu, 16 January 2003 11:26
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no not suction, sorry about the poor explination. my head hurts from thinking how the shorter duration cam and exhaust setup creates more pressure for the turbo so i'll just leave it no-turbo=good. he did have me fooled that there would be too much pressure build-up in my exhaust. anyway i'll run it with extractors for now. thanks norbie.
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Location:
Brisbane
Registered:
May 2002
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Re: 3TGTE running NA
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Thu, 16 January 2003 13:37
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You're actually removing a restriction from the exhaust system (ie the turbine), so I can't see how this is going to cause a pressure build-up! In fact it will do the exact opposite.
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Registered:
June 2002
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Re: 3TGTE running NA
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Thu, 16 January 2003 22:24
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The engine came from the factory with a turbo in working order and was initally run in like this, why 20yrs later should this be any different, hang on it's not!! Cars still get run in with all the components attached!!
Just be sensible, ie. Don't start running 20psi 15km down the road.
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Location:
Ipswich
Registered:
May 2002
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Re: 3TGTE running NA
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Fri, 17 January 2003 04:19
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What are the legalities with running a turbo engine without the turbo? As far as emissions etc?
If I'm not mistaken if you run 3TC pistons in a 3TGTE engine you still retain the reasonable compression to run NA?
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Banned member
Location:
Brisbane
Registered:
May 2002
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Re: 3TGTE running NA
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Fri, 17 January 2003 04:26
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thats a good question ! 
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Club President
I supported Toymods
Location:
Sydney
Registered:
May 2002
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 Re: 3TGTE running NA
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Fri, 17 January 2003 04:37
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Dude,
There is nothing wrong with leaving the turbo on and running the engine in Just keep the boost pressure to a minimum.
Turbo = Bad just means your Mechanic = Idiot !
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Registered:
May 2002
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Re: 3TGTE running NA
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Sat, 18 January 2003 00:58
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I've taken the turbo off because of legal ramifications, not for running it in, anyway the CT20 wouldn't be boosting much while I keep the engine under 3500rpm.
Called engine modifications today, they wouldn't give me a straight answer. A 3T-C in a TA22 involves engine number swap, but since the 3TGTE is out of another car engineering is required. What if I went to the trouble of getting a 3T-C block and put the 3TGTE EFI and head on it without the turbo, in that case it would be an equivalent twin cam 3T-EU. Now how do they know the difference between a 3TC and 3TGTE block?
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Club President
I supported Toymods
Location:
Sydney
Registered:
May 2002
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Re: 3TGTE running NA
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Sat, 18 January 2003 02:18
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Dude,
I have no idea on the legals side of things for Adelaide but you may have some luck if you try this !
Firstly the 3T and 3TGTE blocks are numbered the same so it is unlikely they would know the difference. Just tell them its a 3T with a head swap
It still the sort of thing you really should get engineered tho !
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Location:
Brisbane
Registered:
January 2003
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Registered:
May 2002
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Re: 3TGTE running NA
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Sun, 19 January 2003 12:13
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I was thinking performance and fuel economy would be down, but didn't think about how retarded my timing would be when the turbo is supposed to kick in. It should be interesting how it runs with EFI, I'll give it a go and if the lack of power is too unbearable i'll think about engineering it.
BTW a mate has a letter from the SA rego office stating twin cam T series engines, including the 3TGTE don't require engineering if they are running naturally asperated. But I don't see why people would still engineer their 2TG if it legally didn't need it!?!
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Location:
Adelaide
Registered:
May 2002
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Re: 3TGTE running NA
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Mon, 20 January 2003 02:56
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| inferno wrote on Sun, 19 January 2003 22:43 |
But I don't see why people would still engineer their 2TG if it legally didn't need it!?!
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Insurance perhaps? Regency are a pain in the arse. Having said that, I replaced my 5ME with a 5MGE without needing it being checked, however I have to pay more in insurance for the pleasure.
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