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oldcorollas
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Kita-Ku, Sapporo, Japan
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January 2003

Re: Toyota SC14 Supercharger pros/cons on small diesel

Wed, 03 November 2004 00:58

wagonist wrote on Wed, 03 November 2004 11:39

How does the supercharger's boost respond relative to it revs?

linear.

as it is a positive displacement pump, it will output 1.4L of room pressure air per revolution. this will become less volume as it's pressurised, and the higher the output pressure, the greater the temp rise at the outlet.

with an SC, you should get near max boost from idle upwards.. ther eis no lag. the only thign is that at low rpm, the cam profiles may be such that some of the intake charge is blown out the exhaust due to valve overlap.

if you think you can put in more fuel (or the motor already puts in enough fuel at these lower rpm) then using an SC will make boost much much earlier than the turbo...

onl;y problem i see is that your fuel economy will suffer.... particularly if the SC is pumping all the time, and that much air is not needed.. you could experiment with throttling the intake of the SC, such that on highway/cruise, you are not forcibly pumping so much air.. the turbo, running off "free" exhaust power, would usually increase highway economy...

a water to air IC will make a big difference to intake temps and is probably recommended...

i reckon just give it a go.. would be pretty cheap to set up, and you don't have to worry about AFR like the rest of us... at worst, if the pump doesn't supply thr fuel down low, you will just have a bit more parasitic drag from pumping air, but as soon as the fuel is available, the power will be made... will make an already torquey motor just that much more "stout"

Cya, Stewart

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