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Hello, This will be a great engine to turbo, BUT there are a couple of items I'd like to pass along to you. I am like Ol Rob, I've been around a few years and back in the 70's I owned a turbocharging facility in Las Vegas. We contracted with Fletcher Jones Chevorlet to sell Turbo'ed Chevy's with a warranty!!
Anyway we had great luck with the V8s, but had a severe head gasket problem with the stock 1.8s.
1, First of all replace the stock head bolts with at least a grade 8 bolts, sometime you have to install extra washers to get just the right heighth, check with your local speed shop, perhaps you can find some from another engine that will work, this I don't know. The stock head bolts stretch under boost.
2. Be sure to torque the bolts down extra tight with the new bolts, at least 10 lbs over stock with clean well oiled threads.
3, Buy an adapter to use a "Pinto" upright type Weber 2300 model 2 bbl carburetor to use, the stock one just doesn't work well, you will doing away with most of the vacumn lines anyway.
When you get the Weber 2 bbl, this is a progressive linkage carb by the way, check with a carb guru and he should be able to show you the lead ball blocking off the power enrichment passage. Remove this lead ball, install a short piece of copper tubing in its place and route this line to a true engine vacumn-pressure source. (Behind the turbo) This is because you want the carb to get a true reading of how much air is going into the engine.
4. Also be sure to use a water injection system that will spray water, or better yet a alcohol-water mist when the engine is under boost.
There are several of these systems available, some work on a simple pressure switch that turns on a windshield washer pump connected to a bottle, others are compete computerized systems, check them out.
4. Use a waste gate, do not use an IMCO pressure reducer to control boost, if you want to go over 7 lbs, use an intercooler, you want to keep the intake air as cool as possible. And an IMCO type pressure reducer builds heat into the intake charge.
Just a final note, the Toyota 2.0-2.2 engines were really great engines to turbo, a stock 2.0 would put out about 85 HP to the wheels, while a turboed one with 6 lbs boost would easily put out 175 HP!!!
We actually were able to pull 345 HP from a Colt 1600 CC engine on a dyno! And we ran it for several hours with no problems! (With about 21 lbs of boost)
Most of the crossflowed engines like you have will respond quite well, with under 7 lbs boost, above that, ????
Remember a stock 1.8 will displace 1.8 CCs at sea level-14.7 psi pressure(assuming 100% volumn metric efficiency) while with 7 lbs boost you will have increased the volumn to approsimately 2.8 CCs!
Always work with absolute pressure-not just boost!
Know I got long winded, but hope this will help, don't hesitate to contact me if I can be of further assistance.
dusty scjconv
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