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byndbad914 |
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shoehorn and some butter - it fits ![]() ![]() ![]() Group: Members Posts: 1,547 Joined: 23-January 06 From: Broomfield, CO Member No.: 5,463 Region Association: None ![]() |
Took some video of an open track day this last Friday. There are three of my most consistent, fastest laps to date, all in the 1:55s. I ran one 1:55 the last time I went out with consistent 1:57s after I put some old radials I had laying around on the car from a couple years back, so I got the most out of them the last track day. This time they held on for about 4 laps in the morning, and then just got greasier and greasier as the track and the day warmed up.
So I have three clean laps back to back at the beginning, a slightly slower overall time lap as the fourth but there was some neat traffic so I left it in and it was my fastest shot down the bobsled to hell and sliding back up the hill, then some footage of traffic to see some cars, general bloopers and random chaos. And then I realized upon editing that I left the camera on when I finished, so I got a bunch of footage of various folks coming up and asking questions, talking about the car when they thought I couldn't hear which is always funny, but I threw in one snippet of a corner worker that worked down in that area I would go sliding through and the open wheeler spins. The springs are getting stiff enough that I know I have to get the right camber set on the car, some new radials, then monkey with tire pressures. I suspect that I am in the "1/2 psi makes a big difference" spring rate range. http://www.youtube.com/watch?v=lg8SkOZVLBs |
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strawman |
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Senior Member ![]() ![]() ![]() Group: Members Posts: 881 Joined: 25-January 08 From: Los Osos, CA Member No.: 8,624 Region Association: Central California ![]() ![]() |
I manage a fleet of 50 heavy-duty natural gas-powered and diesel-powered transit buses, and the cost difference of CNG vs. diesel is huge on a cost/mile basis. Realize, tho, that you'll give up some torque going to CNG from diesel and especially from gasoline. That especially hurts when climbing over mountain passes.
The other thing to consider is the price and weight/size of the high-pressure fuel tanks. In short, CNG has fewer BTUs per gallon equivalent of liquid fuels, so you'll have to pressurize it to at least 3200 psi (most go to 3600) and have an array of tanks to get any appreciable range. My buses have 10 tanks that are six feet long and about 24" in diameter to get the same range as a 120 gallon diesel tank. That extra weight eats tires and brakes so you'll need to factor that into your decision. Finally, the spun aluminum & fiberglass tanks have a 15- or 20-year life, after which they must be destroyed (some could be recertifiable, but I haven't heard of many agencies having much luck doing so). Considering that each tank costs about $2500, that affects the bottom line, too. |
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