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, Wed, 20 Aug 2003 21:30:46
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There's a glitch with that one, however. Just for fun, I started playing with A/F ratios to see where you normally would start to -lose- power by further enrichening the mixture. So I went down from 12.5:1 in 0.5 increments and saw HP count go up with every increment. Even when I got as low as 9.0:1, the calculator still said I'd be making like 8-10 more hp than with the next higher (less rich) increment. Surely that cannot be right.
Other things I played with were IC efficiency (and as a result, intake temp drop) which did only lose a few hp going down from 75% to 65%, and IC pressure drop, where going from 0.5 to 1.3 to 1.7 psi only resulted in 1-2 hp less each time! OTOH injecting water at 100 ml/min netted like 10-15 hp, and another 15ish going from 100 to 200 ml/min, which was at least as good as 3 psi more boost! The hp numbers seemed bang on target, though. On 'my' virtual engine, (92x78mm) with no water injection, 70% turbo efficiency, 65% IC efficency, 1.7 psi pressure drop across IC, 11.5 or 12:1 A/F (I forgot which), 6,800 rpm and 75% VE (seems reasonable to me for a modernish oversquare 4-valve engine with cams and some porting) I was 'making' 256 hp or so at 14.5 psi, whilst something stupidly high like 23 psi only netted 32x hp... The set ups closest to how I actually planned to set the thing up all gave in the region of 280-300 hp. Hey, that was what I was projecting all along! Or is this some wicked kind of mind game that somehow gives you exactly that what you are thinking (making you subconciously 'pick' the numbers that give you the outcome you already have in the back of your mind)?...
Overall: big fun, thanks for posting that link, Kevin! :-)
posted by 213.116.150...
, Wed, 20 Aug 2003 22:18:11, Wed, 20 Aug 2003 21:30:46, Thu, 21 Aug 2003 12:31:20
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