err.
what will happen when i install powerfull fuel pump such as walbro, but no fuel regulator.
is it any problems can happen?
and another things with is better
walbro fuel pump
bosch, or sard for sr20det (stock engine)
Depends on what flow of pump you're using. If you're using the 190LPH walbro, you might be lucky to run better than the 255LPH walbro without the regulator. Running too big of a fuel pump without a fuel regulator means you are creating high pressure at the fuel rails, increasing the amount of fuel injected per opening. So running unnecessarily rich at idle too.
IMO, big fuel pump should be accompanied with A-FPR and a fuel management system. Anyway, increasing fuel pressure does not create a bigger explosion in the combustion chamber leading to power. Fuel Injectors has their working pressure, exceeding the working pressure makes it less efficient in their spray patterns. Instead of giving a good one, its jetting out a straight one..thats where you need to find a higher cc injector to feed your engine needs. Wide spray patterns increasing burning efficiency leading to power and not better explosion (detonation).