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Old 08-08-2017, 09:19 PM   #41 (permalink)
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Location: Australia
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Delivery 'Boy - '86 Suzuki Mighty Boy
90 day: 37.15 mpg (US)

SkipSwift - '13 Suzuki Swift GL
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Originally Posted by jonzobot View Post
My next plan is to increase the voltage to the ignition, injectors, and fuel pump to 15v or so. Theoretically they should spray better at higher voltage/pressure.
That... won't work. Your fuel pressure has nothing to do with your pump voltage (unless you have a pump that's too small), it's all your fuel pressure regulator. Even returnless systems have one, it's just 2" away from the in-tank pump, still inside the housing.

Increasing voltage to the injectors will decrease open time, improving flow linearity ever-so-slightly but ultimately injecting more fuel. However the air pressure over the course of the day will vary the mixtures more than this, so I wouldn't bother.

Increasing voltage to the ignition won't help much unless you are bordering on misfiring due to cylinder pressures or have a faulty coil. Side-gapping your plugs will improve burn ever-so-slightly though.


Originally Posted by Crazyrabbit
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