Originally posted by Doohickie@Jul 5 2005, 09:02 PM Do you actually look at how much gas you pump, or do you always assume 14.5 gallons? My car has a 10 gallon tank, but when the gage reads Empty, I still have over 2 gallons left; I usually only pump about 7.5 gallons, and I get about 250 miles on a tankful. Now, if I assume the full 10 gallons, it looks like I'm getting 25.0 mpg. but if I divide by the actual amount of gas used (i.e., 7.5 gallons), I'm actually getting better than 33 mpg. You can't just divide by the capacity of the fuel tank; you have to divide by the amount of gas you actually used (i.e., how much you put in at fill up time).
I also still don't know what pulley y'all are talking about. People describe it: "ud pulley/ its a underweight pulley", but I honestly don't know where "THE" pulley is on the engine, nor what it's function is, based on what you guys are writing here.
yeah i always check that... like i said (not sure if its this post) i usualy drive 50 miles with the low fuel light on and still have 1-.5 gallon left in the tank i divid by what i actually used, not 14.5
Originally posted by Suzuki owner@Jul 5 2005, 03:52 PM lammas car is nice. but its not hard 2 do what he did suzki. why dont u not drive like a maniac 18 mpg is wack. when i race i think i get like 8 or 10 but i can get 29+ highway if i drive like im sane. do you have a fuel leak??? Check ur engine out. gaskets, fuel lines , bad ecu?
I dont see how you'd get your mpg from drag racing since they're 1/4mile tracks, you'd have to do 100drags to get 25 miles which you'd have to go straight to a gas station to find out exactly how much gas you used
Originally posted by Doohickie@Jul 6 2005, 12:02 AM Do you actually look at how much gas you pump, or do you always assume 14.5 gallons?* My car has a 10 gallon tank, but when the gage reads Empty, I still have over 2 gallons left; I usually only pump about 7.5 gallons, and I get about 250 miles on a tankful.* Now, if I assume the full 10 gallons, it looks like I'm getting 25.0 mpg.* but if I divide by the actual amount of gas used (i.e., 7.5 gallons), I'm actually getting better than 33 mpg.* You can't just divide by the capacity of the fuel tank; you have to divide by the amount of gas you actually used (i.e., how much you put in at fill up time).
I also still don't know what pulley y'all are talking about.* People describe it:* "ud pulley/ its a underweight pulley", but I honestly don't know where "THE" pulley is on the engine, nor what it's function is, based on what you guys are writing here.
As I said I drive my car till the gas light flashes many times...to the point it stays on...then I get gas. I do not do this all the time but when I am wanting to check fuel economy very closely for testing & in these cases it takes very close to 14.5 gallons. The fuel economy on these cars has been gone over in many threads before this one. Most do not get the best MPG, that does not mean they are horrible cars as I stated many pros/cons in my first reply.
Also I did mention use of AC from time to time. Some people live in cooler regions and of course fuel economy can change. My wife right now averages 27 MPG in her Neon and like myself drives 90% highway. We both buy 87 Octane fuel.
MAYBE SOME ONE COULD POST A PIC of our engine (side shot) and circle with paint which pulley is replaced so he can see what you guys are talking about.
Dog... I missed your last post; we must have been writing at the same time. Quick question: If you put a different pulley on there, do you need different belts? If the diameter is different, I would think that would affect required belt length. Also, it would seem that if you're not putting as much energy into the accessories because the pulley is a smaller diameter, you're running all your accessories at less than full power, especially at idle. I would expect this to be a problem especially for the a/c, since a/c at idle is already marginal for many cars. Thoughts?
And as for the whole pulley thing, you have to understand that not everyone is up on the practices used to squeeze every last bit of power out of an engine. When some mentions an air intake, that's pretty self explanatory. But until this board, I've never heard people casually discuss "the pulley" when talking cars. I don't hang out with motor heads (well, not any more, and the ones I did hang out with were big V8 guys that couldn't be bothered with little stuff like pulleys), so you have to write slow and use small words if you want me to understand.
heh, yeah, when I first read "lightened UD pulley" I was a little confuzzled too.
It's the main pulley on the engine. The one that turns everything else.
Lighter is better in that department. The stock one is 10lbs! Where the one available through 360 Dynamics weighs only 1lb.
I'd say kinkyllama can tell you more since he has it installed in his Forenza. As far as I've read about it, there are no problems by using it. Although I think I read somewhere that you do get less amperage from the alternator. It's not supposed to make much diff though, unless you're running a huge audio setup.
I really really want one, but I'm too chicken about my warranty..heh....Nice thing is though, it's an easy install/removal. So if I do get it and need to swap it back, it should be no prob.
Biscuit... Have you checked if it would void the warranty? I have a appt with my dealer next monday and I have a list full of questions to ask him regarding different things that could void the warranty... I will be sure to ask him about the pulley as well because this is something that I too am interested it!
If you missed it, this paragraph provides insight:
Quote:
Another perspective is that auto manufacturers such as Saturn are always trying to squeeze the last 1/10 of a MPG from their vehicle’s fuel economy estimates. Big dollars and big engineering budgets are dedicated to this task, and you can bet that if any component could be underdriven further (a potential plus for fuel economy) and still meet its performance and durability bogeys, it would have been already.
Horsepower and fuel management gains come from multiple modification and parts replacement. Going as light as possible on the accessory system will net results; however, that would tend to include also freeing up weight on all the other pulleys as well.
My position? I'm not trying to discredit, or be a nay-sayer; however, unless significant modifications are made to an engine, as a daily driver, just the crank pulley alone doesn't offer much. The site I posted is only one of many that produce real-world proof of that. I only chose to display it because you were very interested in as much information as possible.
Others here will perform multiple modifications over time, so it may be worth it to them, I have little doubt; however, for the grand majority of people, it's not worth it.
I neglected to mention that in most cases, a underdrive pulley is best for applications on Superchargers or Turbochargers, as the smaller diameter pulley will increase component spool rates, translating into higher air pressure for forced induction. THIS type of pulley is more effective.
I live in florida... and with the constant heat and humidity down here, the a/c us almost always on... Do you think that it would be wiser to stay with the stock pulley?
Linear Mode
