08-01-2011, 05:50 PM
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#11 (permalink)
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He's got a DeLorean and is holding out on us!
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 Today
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08-01-2011, 08:18 PM
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#12 (permalink)
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Master EcoModder
Join Date: Apr 2011
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I usually only skip 4th gear on down hill semi-suburban areas.
My '87 CRX seems very happy about it!
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08-02-2011, 12:34 AM
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#13 (permalink)
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Master EcoModder
Join Date: Jul 2008
Location: Cypress, TX
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Formula - '96 Firebird Formula/Trans-Am 90 day: 19.31 mpg (US)
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It's actually used to improve fuel economy for EPA testing on many cars.
Since the 90s, GM has used it on their 6spd muscle cars in the form of a forced 1-4 shift. Under light load conditions, when you shift from 1-2, a solenoid clicks in and the gate for 2nd slides you into 4th. It'll do this at light load and under 25 mph on my car.
It was to improve the fuel economy in EPA testing, and is used today to avoid the gas guzzler tax on many cars.
I found it annoying, since I skip shift into 3rd anyways. It locks out third as well. On the GM cars, it's easy to disable. It wasn't lugging the motor per say, but it wasn't always an optimal gear for what I was doing. You could hold the trans in N for a second and it would disable the skip shift, but that kills momentum.
Of course, big GM V8s have enough torque to drive just fine in 4th gear at 25-30mph.
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Lets see how far it can go
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08-02-2011, 12:54 AM
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#14 (permalink)
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Pokémoderator
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Frank -
Quote:
Originally Posted by Frank Lee
He's got a DeLorean and is holding out on us!
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Wellllll, there isn't a way to measure DPGe in the garage, so I figured, what's the point?
DPGe = Dimensions-Per-Gallon-Electric
CarloSW2 |
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08-02-2011, 08:43 AM
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#15 (permalink)
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Master EcoModder
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The 92 F150 has a very tall final drive ratio, 1550 RPMile in 5th gear. On a recent 860 mile trip, I started back on Interstate 20 in SC and accidently left it in 4th gear for 10 miles. It was dark outside and it took that long for me to realize my mistake.
Truck got 20 MPG at 70 MPH which worked out to 1800 RPM in 5th gear (.79 OD with a 2.73 rear, 28 inch diameter tires).
regards
badger
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08-03-2011, 04:03 AM
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#16 (permalink)
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Master EcoModder
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Formula - '96 Firebird Formula/Trans-Am 90 day: 19.31 mpg (US)
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Quote:
Originally Posted by Old Mechanic
The 92 F150 has a very tall final drive ratio, 1550 RPMile in 5th gear. On a recent 860 mile trip, I started back on Interstate 20 in SC and accidently left it in 4th gear for 10 miles. It was dark outside and it took that long for me to realize my mistake.
Truck got 20 MPG at 70 MPH which worked out to 1800 RPM in 5th gear (.79 OD with a 2.73 rear, 28 inch diameter tires).
regards
badger
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Just imagine if you could get a T56 in there.. .50 OD 
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"All I know about music is that not many people ever really hear it. [...] But the man who creates the music is hearing something else, is dealing with the roar rising from the void and imposing order on it as it hits the air. What is evoked in him, then, is of another order, more terrible because it has no words, and triumphant, too, for the same reason. And his triumph, when he triumphs, is ours." -Sonny's Blues
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08-03-2011, 05:02 AM
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#17 (permalink)
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Yeah, it would probably make fe worse. Or maybe I just drive it too damn slow? 
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