Pre-ignition can be caused by too much spark advance or too
low octane gas.
Was told due to
low octane gas, this can happen and it happens often.
As higher temperature boost is added,
low octane gas will become problematic quickly.
High compression engines (performance cars) would cause
low octane gas to combust under the pressure alone rather than from the spark plug firing, resulting in knocking, which is very bad for the engine.
My view is: Try
lower octane gas, if you notice either knocking or decreased performance then you should stick with the higher octane fuel.
Try
lower octane gas, if you notice either knocking or decreased performance then you should stick with the higher octane fuel.
Not exact matches
Too add on I have a premium only car also, and when you put regular
gas in the knock sensors pick it up so the ecu can retard or advance timing to compensate for the knock that
lower octane fuel gives.
Premium fuel is actually slightly
lower in btus than regular, AV
gas, which is 110
Octane has 4 % less btus than regular
Both models run on the
lowest grade
octane gas.
Mixing race
gas and regular premium unleaded won't damage the V8, but the high -
octane mode won't engage if sensors detect the combined fuel
octane is too
low.
(
octane) / Capacity (gal): 91/25.4 SAE Peak Horsepower: 416 @ 5,250 rpm SAE Peak Torque (lb - ft): 450 @ 2,250 rpm Transmission Type: 7 - speed automatic transmission with steering wheel mounted shift paddles Model: 7G - Tronic Ratios: First: 4.38:1; Second: 2.86:1; Third: 1.92:1; Fourth: 1.37:1; Fifth: 1.00:1; Sixth: 0.82:1; Seventh: 0.73:1; Reverse 1: 3.42:1 Reverse 2:2.23:1 Transfer Case Type: 2 - speed transfer case, fulltime with locking center differential Model: N / A
Low - Range Ratio: N / A Axles Front Type: Solid Front Diff: manual locking Hubs: Automatic Rear Type: Solid Rear Diff: Manual locking Ratio: 4.38 Traction Aid: locking differentials (front and rear) and 4 - Wheel Electronic Traction System (4ETS) Suspension Front: Rigid Axle with longitudinal and transverse links, coil springs,
gas - pressurized shock absorbers, stabilizer bar Rear: Rigid Axle with longitudinal and transverse links, coil springs,
gas - pressurized shock absorbers Steering Type: Hydraulic assist recirculating ball box Lock - to - Lock: 3.25 Turning Circle (ft): 44.6 Wheels 7.5 J x 19 aluminum alloy Tires P275 / 55R19 Pirelli Scorpion Zero Brakes Front: Internally vented rotor 12.4 - inch discs Rear: Internally vented 10.7 - inch discs 60 - 0 mph As Tested (ft): 95 Acceleration 0 - 60 mph As Tested (sec): 7.92 Weight (lb) Curb Weight (As Tested): 5,900 Advertised GVWR: 7,056 Trailer Tow Capacity: 7,000 Mileage (mpg) EPA Estimate (city / hwy): 13/14 As Tested: 12.24 Dimensions (in) Wheelbase: 112 Overall Length: 188 1/2 Overall Width: 81 1/2 Overall Height: 77 1/2 Front, Rear Track: 59 3/4, 59 3/8 Front, Rear Overhang: 17 1/4, 27 Min.
6) Gasoline You can save hundreds of dollars a year by comparing prices at different stations, pumping
gas yourself, and using the
lowest -
octane called for in your owner's manual.
Buy
gas at the
lowest octane level for your car.
Unless you have a carbureted engine, avoid fueling up with
low -
octane gas.