Originally Posted by RoshDawg Nice that makes sense. Judging from your other posts I take it you're an engineer? If so, what kind? Oh and op, use 91 at least.
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03-31-2013, 10:14 PM | #16 (permalink) | |
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I also spent some time in mechanical maintenance, so have been around pumps, valves, flow, &c. I was always asking the engineers "Why'd ya do it that way?" and most of them LOVE to splain stuff to others. heehee
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03-31-2013, 10:44 PM | #19 (permalink) |
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To save on gas costs, I just siphon gas from my neighbors' lawnmowers that is, the neighbors I don't borrow gas from for my own lawnmower...
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04-01-2013, 01:04 AM | #20 (permalink) | |
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04-01-2013, 03:04 AM | #21 (permalink) | |
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04-01-2013, 08:27 AM | #22 (permalink) |
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That makes a little sense, the viscosity of oil would be affected by the temp, less so with a synthetic, but I think the temp changes would have to be fairly big to see a diff.
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04-01-2013, 09:11 AM | #23 (permalink) |
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Forced Induction. (in other words) SuperChargers or Turbos.
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04-01-2013, 09:18 AM | #24 (permalink) | |
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That being said, the heat energy is generated by fuel energy. You want to have more of that energy end up turning your crankshaft as opposed to going into the atmosphere as heat. Running hotter reduces the delta T in the combustion chamber allowing more of the heat to stay in as opposed to going into the coolant. (this is super basic overview). as a rule of thumb your fuel energy is 30% crankshaft power, 30% cooling losses, 30% exhaust, and 10% friction. What they are attempting to do with running hotter is take some of the cooling % and put it back into crankshaft power. We are talking very small amounts... but every bit helps to meet the future regulations.
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04-01-2013, 10:05 AM | #25 (permalink) | |
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It's not really something the average weekend mechanic wants to mess with as there are a lot of other variables involved. Changing the engine temp (eg, by installing higher/lower temp thermostat) can affect how the ECM reacts. Plus there are limits to how far you can go before pre-ignition becomes a problem - especially with a high-compression engine.
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04-02-2013, 09:49 AM | #29 (permalink) | |
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First off, max hp has very little to do with mpg's. There is no way in hell you're getting 16-17 mpg in a V8 Tundra at wide open throttle all the time for example. It all depends on driving habbits, and let's face it, you're more likely to want to hit the throttle a bit more driving a sports car. Basically, I've averaged anywhere from 30 mpg cruising on the highway, to 12 mpg with a stupid grin on my face. You're going to spend money on a car that has tires that last about 15k miles and cost about $1k to replace. The difference between using regular gas and premium gas is about $0.02 more per gallon....spending an extra $100-200 a year on premium fuel isn't something to really worry about. Just as an example, if you're driving a Civic and are on a budget & fuel savvy, premium fuel wouldn't have any real benefits for you since you're not really after the performance aspect. You're gonna drive that thing like a grandma to get the most mileage. The opposite is gonna be true (with me anyways), driving the Z. I always go with 93 octane and average 22-28mpg of mixed city and highway driving.
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04-02-2013, 06:41 PM | #30 (permalink) |
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Listen dude, get the Z. I drive an F150 all day at the Pool company I run. When I get done work and get in my NISMO, my bad day just disappears. You having a truck too so let me tell you there is nothing more satisfying to tear up a back road on the way home after driving a big cumbersome vehicle all day. I really appreciate the car more to feel the agility and speed of the car. I know the Tundra is quick for a truck, but believe me it doesn't have **** on the Z.
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