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Originally Posted by Richard L
...0.6mm: - we have got that far yet, you must be getting some exceptional response, based on the 0.3mm jet we tried.
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The power you're making is about 200-250bhp higher than what I'm working on, so my water/fuel ratio is even higher.
Also I am on *stock* turbos, that are outside their efficiency range from 1 bar upwards, so my gains could potentially be higher.
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almost all factory turbo cars run rich, so if pre-turbo is so effective to lean-off a/f ratio, then there is little tuning needed to gain power plus point is the in-built fail-safe mechanism?
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It all depends on HOW MUCH rich we're talking about.
Mine for example runs AFRs of 10.0 at 1.1 bar with stock fuelling.
Simply adding modest precomp WI (trigger at 14psi) on to this setup loses me 10bhp and 10lbft (around 3.5% loss). Boost also drops by 0.05~ 0.1bar with W.I.
If you're already running rich, W.I. makes things
worse
Running even richer (after an ECU reset) doesn't even stop it from detonating, mine pulled timing immediately despite the WI (at 8psi) and running rich as hell. Resetting the stock ECU also resets the timing advance to the max values, so first time round the ECU 'hunts' for det, which it found.
I was running 99RON fuel by the way, Tesco's finest, nowhere near race fuel --- I want realistic figures, without fancy FMICs, airfilters, open bonnets etc.