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Location:
South Australia
Registered:
July 2002
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Re: Celica engines...
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Wed, 22 December 2004 13:47
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Stroking an engine will not reduce is rev-ability (per se). There are many possible factors, camshaft layout/design being the primary culprit in this case (imho). Also, Toyota didn't exactly over-engineer the conrod/piston design because they *knew* that the scissor gear camshaft layout would be limiting. So even if you do find some way of reducing the weakness in the camshaft layout, then you will have to start looking at the bottom end set-up too.
You will also find that the 3S-FE is as equally unrevable as the 5S-FE. In fact, some 5S-FEs are more revable (although less powerful) as they added balance shafts to reduce a vibration (or harmonics or free moments of inertia whatever you want to call it).
I'm not sure why your car has a 3SFE in it, because almost every celica ST184 in Australia came out with the 5S-FE.
As for turbo-ing the 3SFE...afaik one thing is that no GE intake manifold bolts up to the FE heads - so you won't be able to use a 3S-GTE intake manifold. I'm not certain, but I am going to *guess* that the exhaust manifold bolt pattern is the same between 3S-FE and 3S-GE engines, I wish I could confirm this. This means that if you can find an exhaust manifold from a 3S-GTE (pref. one from a ST185) you should be able to set up a CT26 fairly easily. CT26s are fairly common *however* they may be a little big considering what level of boost you would likely run on a 3S-FE engine, a CT20 or CT12 might even suffice, but I have no idea if you can actually bolt those up to a 3SGTE manifold (anyone know more?).
Further more, 3S-FE injectors are pretty weak - I think they are around 300cc or less - maybe 270? this is more than likely going to be a big issue. One thing, the 3S-FE runs at least 9.0:1 compression, your intake charge is going to be *hotter* than before (compressors tend to heat up the air rather than increase density of the air), so you can see how this is a tuning disaster waiting to happen. Also the combustion chamber/piston crown shape of the FE engine is probably not the best for turbocharging - I'm fairly sure that heat will tend to build up around the spark plug area due to the low speed of flamefront propagation (pent roof + dish piston = no squish <- my understanding here is limited at best so I'm sure others might know better). Even with decent intercooling the intake charge is just going to get hot, which means you want more inert matter to absorb the heat, rich mixtures will help (but to acheive this you will be pushing the limits of your injectors), water injection and decent exhaust gas management could also help.
Lastly, you've got the engine management to take care of  No mean feat, your options here are limited - either spend a fortune and get something programmable, DIY with a megasquirt, or try stuff like SAFCs ???
I can only really scratch the surface as a) I'm not a professional most of what I have learnt has been from hours of reading various crap on this forums and b) I have never done an NA turbo conversion before.
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| | Subject | Poster | Date |
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Celica engines...
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Blah_00 | Mon, 20 December 2004 15:39 |
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Re: Celica engines...
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stradlater | Tue, 21 December 2004 05:45 |
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Re: Celica engines...
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Intensevil | Tue, 21 December 2004 06:00 |
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Re: Celica engines...
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Blah_00 | Tue, 21 December 2004 14:02 |
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Re: Celica engines...
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RWDboy | Wed, 22 December 2004 13:47 |
