WHY? does my 911&914 rune better with 1/4 tank Options

[yellow914]

I noticed when I had a 74 carrera 2.7 that at about 1/4 tank I'd get more H.P.'s and now that I have a 75 1.8 914 I get the same thing way better throttle response??? I doubt it's due to weight...any ideas?

[mightyohm]

The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.

(IMG:style_emoticons/default/blink.gif)

[yellow914]

The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.

(IMG:style_emoticons/default/blink.gif)

Awesome!...it was driving me nuts....I noticed like a 20% plus increase!

[ericread]

The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.

(IMG:style_emoticons/default/blink.gif)

(IMG:style_emoticons/default/bs.gif)

Sooooo, the gravitational pull of the fuel... I have posted some BS remarks before, but this tops the chart! Let's see now, gravitational pull of an object is directly proportional to it's mass. Therefore, the mass of the gasoline would be so significant as to exert it's gravitational pull over the Earth's gravity and other large objects...

(IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/av-943.gif)

A very entertaining explanation, but it just doesn't hold water... er, gas.
Let's see... A gallon of gas weighs about 6 pounds. So a 12 gallon tank would weigh about 72 pounds. For shits and giggles, let's say that the weight of a gallon of gasoline = about 0.45 Kilograms at 60 degrees F (temperature is actually an important variable here). Thus, you have a mass of about (72 pounds times .45) 32.4 Kilograms.

So the 32.4 Kilograms of mass (the gasoline) is interacting with a significant gravitational force. Let's see, the other really big gravitational force is the Earth, which has a Mass of about 6,600,000,000,000,000,000,000 (6.6 sextillion) short tons (6.0 sextillion metric tons), or 6.0 × 1024 kg.

So in a contest of gravitational forces between the Earth and the gas, the Earth clearly wins. In fact, if it were true that there was a significant gravitational pull of objects which have a minor mass, say like a 50 story building, then the gas would be pulled to the building rather than to the engine. In fact we would all be pulled to the building. Bummer.

Nope. But it was fun to dissect. I haven't done this math in about 25 years, since I taught astronomy at a planetarium, so I may be off by a decimal point or so.

But it really doesn't matter, the gravitational pull of non-significant objects (say, smaller than the moon) just don't have any measurable effect, and thus, doesn't asssit in your car's performance.

Let's do this again sometime (IMG:style_emoticons/default/bye1.gif)

[zymurgist]

The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.

(IMG:style_emoticons/default/blink.gif)

Agreed. Any astronomer will tell you that the more the universe expands, the faster that expansion is occurring. Therefore one can conclude that the emptier the vessel, the faster it goes, so your fuel tank will reach maximum velocity just before yout engine is starved for fuel.

[SGB]

(IMG:style_emoticons/default/av-943.gif)

The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.

(IMG:style_emoticons/default/blink.gif)

Agreed. Any astronomer will tell you that the more the universe expands, the faster that expansion is occurring. Therefore one can conclude that the emptier the vessel, the faster it goes, so your fuel tank will reach maximum velocity just before yout engine is starved for fuel.

(IMG:style_emoticons/default/chair.gif)

[ericread]

The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.

(IMG:style_emoticons/default/blink.gif)

Oh, I forgot to mention one other thing. Besides the gravitational pull thing, I need to mention the error in the statement "the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump".

Everybody knows that you can't turbo a 914... (IMG:style_emoticons/default/laugh.gif)

[DNHunt]

It seems to me it might have something to do with the choice of measuring instruments. Butt dynos are are notoriously inaccurate. It may be open for discussion but, my opinion is they may vary in the neighborhood of + or - 20%.

[purple]

Glad to see the sense of humor is still alive!

probably because gas weighs 8 pounds per gallon. less weight = more speed

[ericread]

I absolutely love the term "tiny turbocharger inside your fuel pump"!!!

It gives me visions of tiny exhaust pipes and wastegates! (IMG:style_emoticons/default/av-943.gif)

Whatever it is, I want one!!!

[ConeDodger]

You know, Randall recently did an experiment with something like this. He found that the car was definately faster with fuel in it than without. Unfortunately so did the rest of us. (IMG:style_emoticons/default/mad.gif)

[ericread]

You know, Randall recently did an experiment with something like this. He found that the car was definately faster with fuel in it than without. Unfortunately so did the rest of us. (IMG:style_emoticons/default/mad.gif)

(IMG:style_emoticons/default/av-943.gif)

[brer]

Octane settles over time so when you get to the bottom of the tank you get all the juicy bits.

[ericread]

Octane settles over time so when you get to the bottom of the tank you get all the juicy bits.

I have optimized my tank so that I only feed my engine from fuel the bottom quarter of the tank. No matter how full the tank is, my engine only receives gas from the bottom quarter. This allows me to always access the juicy Octane bits.

[purple]

OMG NO WAY! I DID THAT TOO! We Rock!

[brer]

How did you do that?
If someone makes a kit I'm buying.

[Heeltoe914]

The gravitational pull of the fuel in the tank counteracts the torque of the engine when the tank is full. At less than half a tank, the effect is reversed. The net effect is that with a nearly empty tank, the fuel is actually accelerated into the engine, like a tiny turbocharger inside your fuel pump.

(IMG:style_emoticons/default/blink.gif)

Thats deep WOW. good info (IMG:style_emoticons/default/chair.gif)

[ericread]

Let's face it. There are no quick fixes to milage or performance. You have to use the gas magments if you want significant increases.

[ConeDodger]

Let's face it. There are no quick fixes to mileage or performance. You have to use the gas magnets if you want significant increases.

Word! (after I made a little spelling correction)

I used one of those turbo devices in my intake once and my stocks went up by 70% I am now a believer. I religiously watch late night and day-time cable to find out the latest innovations. Billy Blanks is a God to me...

I hear the latest is to rub pickle juice on your tires to get more miles out of them. It is an incredible use for something that goes to the sink in most cases. The tire companies don't want you to know that. In fact they will probably buy this website and shut it down to keep this information under wraps... (IMG:style_emoticons/default/av-943.gif)

[purple]

Let's face it. There are no quick fixes to mileage or performance. You have to use the gas magnets if you want significant increases.

Word! (after I made a little spelling correction)

I used one of those turbo devices in my intake once and my stocks went up by 70% I am now a believer. I religiously watch late night and day-time cable to find out the latest innovations. Billy Blanks is a God to me...

I hear the latest is to rub pickle juice on your tires to get more miles out of them. It is an incredible use for something that goes to the sink in most cases. The tire companies don't want you to know that. In fact they will probably buy this website and shut it down to keep this information under wraps... (IMG:style_emoticons/default/av-943.gif)

See, my previous owner stapled bacon to my tires before selling the car to me... sadly, all it does is make the tires slippery...

I seriously want to change my forum name from purple to Bacon_Tires now.