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wagonist
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May 2002

Re: Toyota SC14 Supercharger pros/cons on small diesel	Tue, 02 November 2004 02:41

I'll try to supply some more info about my engine. Has a compression ratio of 24:1 Does not blow any black smoke. I run 20mL of injector cleaner with every refuel & this is evident by the lack of black residue on the back of my car (help when installed a dump pipe on the end of the exhaust instead of straight out) Yes, it runs a mechanical injector pump which has a crude manual adjustment for fuel, but also has a computer attached to control the advance & amount of fuel relative to the boost level. The turbo itself is not a problem. I don't know what turbo it is but it looks like the size of a CT20. It will however have different vane angles, etc. The biggest problem is the exhaust manifold. My engine is mounted east-west. Due to the size of the injector pump, it ,and the inlet manifold, is mounted on the front of the motor with the p/s pump above & A/C comp below. The turbo is a high mount on the back of the motor near the left end cylinder. Underneath the exhaust manifold & above the steering rack, the the oil filter (100mm dia, 150mm long) is mounted horizontally. The exhaust manifold itself is a log type with one side about 50mm away from the head. Therefore, no nice curves or merges. Just sharp right angles and T joints. And because of all the other things around it, a nice equal length smooth bended jobbie simply won't fit. The inlet manifold is log type as well, with no throttle body & a turn around the left end of the head to aim at the turbo outlet. I'm already running a 2.5" straight through exhaust, so that won't be an issue. Yes, fuel delivery will have to be tinkered with, but as the engine is already designed to pump in more fuel (to a point) with more boost, this will only be a crude adjustment. The main aim of the exercise is to have boost earlier to overcome the lag problem. I'm not interested in what happens past 4000rpm. If you've seen my torque curve, you'd see why. Exhaust temp is a critical part of tuning a diesel. This is an indication of how hot the combustion is (too hot & the fuel ignites too early) I'm already starting to look at how to fit a water-air intercooler in, plus engine oil cooler to help keep combustion temp down. [Report message to a moderator]

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