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Registered:
December 2002
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3T-GTEU / CT20
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Mon, 10 March 2003 13:33
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What should a standard 3t-gteu get on a compression test, in terms of PSI, The engine doesnt seem to be pulling like it used to. Does anyone know anything about the timing marks on the pulley, so i can check the timing/advance the timing a little?
any comments at all are appreciated.
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Registered:
May 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 07:22
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my 3tgte was running 110 on all cylinders, then i advanced the cam timing a notch or two and got it running 140 across all four. This is a fully rebuilt 3tgte, not yet run in, dry test, all plugs out and throttle fully open.
as for ignition timing, i'm not sure what the 3tgte stock timing is supposed to be. if it was me i would loosen the dizzy slightly and just very slowly adjust the timing until the engine revs smoother/free-er, or tighten it and take it for a spin, but i wouldn't recommend anyone who has never adjusted their timing before do it.
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Registered:
November 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 10:43
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Standard timing for a 3T GTE is 12 degrees before TDC. There are 2 marks on the main crank pulley. Looking from the front of the engine the one most anti clockwise is TDC and simply timing so the next mark (more clockwise) is in line with the pin thats mounted to the front timing chain cover and your done. That mark is 12 BTDC.
To adjust the timing, loosen the bolt under the dizzy, run the engine and slowly rotate the dizzy until the mark lines up. Do this with the vacuum line to the dizzy removed so the timign doesn't advance at all.
Obviously you need a timing light to do this. If you don't have a light, then dont mess with it.
Good luck,
Simon
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Registered:
December 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 11:11
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That timing info is GOLDEN, thanks.. Im a tad confused by the vacume, advancing tho, when i disconnect the vacume hose from the vacume diaphram on the dizzy, there is no suction, even if it pull the throttle, theres never any suction there, i thought that when you put your foot down, it advanced the timing a tad? my engine does seem very very slow till the turbo charges up, then it holds yer back in the chair.
and where does that vacume line come from? cant track it back goes right down to the sump somewhere [/edit]
[Updated on: Tue, 11 March 2003 11:20]
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Registered:
November 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 11:22
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Sounds like you could have a blocked vacuum line or even split somewhere. To check it out, do the following.
Leave it all connected, run the engine and put a timing light on the main crank pulley.
Rev the engine and check that the timing advances, if it stays still then there is a fault with your vacuum advance system.
Simon
http://users.senet.com.au/~mezz/stitle.htm
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Registered:
December 2002
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Registered:
November 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 11:35
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<TA22 GT = a man of much knowledge. >
Thanks...
No vacuum = poor performance.
Check the vacuum line. It can't be too complicated if there is no vacuum. There should be a small amount of vacuum even at idle.
Sounds like the advance on the dizzy is fine. You either have a split hose or maybe its disconnected or soemthing.
Fix that and you should be flying past N/A Celica's.
Simon
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Registered:
December 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 11:44
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What happens when boost comes on does it stay advanced or does it actaully retard timing? cause if it is still advanced when boost is on, then there could be a SHIT load of power being lost. advancing it without boost is one thing, but being advanced with boost = teh celica killer.. btw this was a 1995 celica 
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Registered:
December 2002
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Registered:
November 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 11:51
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The timing should stay advanced under boost. So yes, there will be much more power.
I have alot of info on my site, trouble is that there are hundreds of little things that can go wrong so its hard to cover it all.
Most of my info is about technical mods and how to do things rather than fixing the more basic problems.
Simon
http://users.senet.com.au/~mezz/stitle.htm
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Location:
Canberra
Registered:
May 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 11:55
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you should definately be able to hear/feel the vaccum in the line to the distributor diaphragm. if not, run a new line straight from the diaphragm into a fitting on the plenum that you can both blow & suck through. you may need to tap into one of the existing lines with a "T" piece. the fuel pressure regulator line is a good place to go.
without vacuum, the car will be pretty doggy off boost, particularly at part throttle acceleration (less than 5" manifold vacuum) BUT the bigger problem is that the distributor will not retard timing on boost!! THIS IS BAD as you will be much closer to detonation, & we all know how well the 3TGTE pistons go with just a little bit of pinging! goodbye ring lands 
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Registered:
November 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 12:01
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My mistake, the timing will retard under boost. Obvious since there is no vacuum and actually positive pressure.
Simon
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Registered:
December 2002
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Location:
Canberra
Registered:
May 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 12:14
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are you running the factory ECU & knock computer? This will retard timing when it senses knock.
another thing if you are using the knock computer, it may not work properly if you hook the dizzy up directly to the plenum as i mentioned earlier... I think it runs through a series of wierd valves/bypasses under the plenum in the factory setup..
No, it does not advance when you floor it, it advances more with INCREASING manifold vacuum, ie: when cruising, decelerating, or on light load. It will retard back to the base 12 degrees at zero manifold vacuum (accelerating before boost hits) plus whatever advance the mechanical weights in the base of the dizzy take it up to.
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Registered:
December 2002
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Location:
Canberra
Registered:
May 2002
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Re: 3T-GTEU / CT20
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Tue, 11 March 2003 12:24
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Then leave it disconnected if you feel its such a rocket right now 
if its taking you 11 seconds to 100kph, you got bigger dramas then worrying about the small handful of kilowatts that a few degrees of timing is going to make.
So do you run the factory ECU?
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Registered:
December 2002
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