If you install a lower powered alt then it'll take longer to charge your battery once its voltage drops. The load on the engine will be smaller, but it'll stay on for a longer time. Similarly, installing an underpulley on the alternator to reduce its rpms, and therefore load on the engine, also takes longer to charge the battery. Take that into account if you decide to use a clutch pulley of a different/larger diameter.
What would be ideal is an alternator with a power output close to the max safe level that your battery can be charged, that way you'll get the most out of it when engine braking.
BTW:
Quote:
Originally Posted by G2TDI
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Groar isn't much worse - he's done
1900km on a single tank in his '97 Megane
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
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[Old] Piwoslaw's Peugeot 307sw modding thread