Quote:
Originally Posted by GarethK
Making the car richer at lower rpm = cooler EGT = slower spool. If that's what you meant be 'increasing fuel air ratio' then I disagree it will makethe turbo spool quicker.
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I was meaning , going from 11:1 up to 13.5:1 or more. Leaning it out, increases the EGT temperature and you through putting more gas sooner as there is more air. This spools it faster (sooner). BUT the trade off is your acceleration in that RPM band could be slower and this tends to make the boost come at you all at once. There is a RPM point and this varies with each engine as to when to bring the fuel air ratio back down and control knock and to produce your HP. This has to be done by a talented tuner of which there are a few here on this form.