Originally Posted by MadMerv
This is how I was taught too.
I don't understand how coasting in gear can safe fuel. Not that I disagree, I just can't wrap my brain around it.
Smile
93' LE #1136 - FM II
250k miles
lostlorin
I came out of lurking because this is a safety issue. I could care less if you
wear out your clutch. I could give more explanations and formulas, but I am sure the answers are already well known. If you do not believe me, ask a clutch expert.
Back to Lurking
When coasting in gear, vacuum is at its highest. When the ECU sees high vacuum and the TPS shows closed, it will actually shut off the fuel injectors completely. I had heard this before but never really believed it until I got the LINK ECU. If you watch the keypad, you can actually see the fuel injector duty cycle going to zero.
But...but...but...you can't coast as far because there is drag from the engine.........
Besides, I don't think that is really coasting. As I said, I'm going to continue what is working :) We're going to TWS this weekend in the Kia. I will report back on the fuel economy next week. Of course, we're taking the dog so he run in the squirl cage!!!!!!
Glad you've gone back to lurking, whoever you are!
92 Sunny 214k, 95 Dimples, 93 James Bondo, 92 SM (Speedie Jr)
Shelley, Apex, Tigger, Max, Baby(cats), Fluffy, Spot, and Peanut (mini horses), Cinnamon & Bitsy(dawgs)
MSR #1001, SCCA #208822Let's go racin'
Merv you should meet him (lost216) he is a heck of a nice guy!
This is my thinking too......get out of my head Merv.
Thanks for the explanation Titus.
So I have to drive like thisto get better mpg???? Kidding.
Smile
93' LE #1136 - FM II
250k miles
+1
On the track, I am fearless.
If you were as slow as me, you wouldn't be afraid either.
1994 M Edition
CSP 67
If you're driving along and the light ahead turns red, you're better off leaving it in gear and "coasting" because the fuel injectors will shut off and you'll coast far enough to get to the light.
If you're at the top of a big hill and want to use the least gas to get the next mile or two down the road, I'd bet you're right - idling in neutral uses less gas. If you "coast" in gear down the big hill, you're right, you'll have to open the throttle and start burning gas again sooner.
I suppose Titus and his Link could log injector duty cycles or something to figure out whether which is better. Given that I can't keep from shifting well above 4000 rpms most of the time, I don't really care...
Have a great 4th, all!
'96 M-edition
Well 55mph isn't appreciated by all.
I was driving 55mph in the right lane when a big rig passed me and blared his air horns right at my ear.
BTW, the speed limit was 65mph but I was in the right lane. Most of the time I've had someone keeping a constant distance behind me but not today.
Eh I just need to learn that I don't have to be the first to the other side of the intersection to show how cool my little car is! That would greatly increase my gas milage (and decrease my chance of being hit by a red light runner). Sigh, growing up isn't very fun....
So you're the reason for the slow-downs in McKinney.Well 55mph isn't appreciated by all.
I was driving 55mph in the right lane when a big rig passed me and blared his air horns right at my ear.
BTW, the speed limit was 65mph but I was in the right lane. Most of the time I've had someone keeping a constant distance behind me but not today.
05 MX-5 Mazdaspeed #1024 Titanium Gray Mica
I think driving 55 on 75 takes more balls than driving 100 on it!
GL with the mileage though.
Chris
91 Miata (#3), Rattle Can Grey(previous owner), Greddy Turbo @7 PSI and Manifold (Only items remaining from the kit), TDR I/C, Godspeed Radiator, RM DP, 2.5 Enthuza Bipes, BEGI AFPR, ACT, Lightened Stock Flywheel, Yellow Konis, FCM on Stock Springs, HDM2S, MOMO Wheel, Ratsback Front CF Lip, Black Rota's on EcstaXS, Corrado Rotors & XP8's on Front w/ 1.8 rears.
http://austinmiata.com/
Wishlist: Megasquirt to run 12-13 PSI, White non-spray paint job, 8" 6UL's, RX7 LSD, Evans Waterless Coolant
The difference between 26 mpg and 32 mpg on premium fuel is $0.03 per mile. 100 mile trip $3.00 or 1 small Starbucks I will be finishing when you get there.
Don't let the terrorists win!
Stripe Das Sape
We are leading the world to democracy by example.
Don't get yer knickers in a twist, I's just jokin' wit ya.
BTW, "I got 29mpg on my trip to Tahlequah, OK today. Averaged 70mph+++.
05 MX-5 Mazdaspeed #1024 Titanium Gray Mica
New name for those people who try to squeeze every mile they can out of their gas...
Hypermiler!!!
http://www.dallasnews.com/sharedcont....35fa7769.html
Dallas hypermiler Chuck Thomas demonstrates his techniques
Mr. Thomas regularly putters along on the highway at 50 mph in his Honda Insight, swerves into turns rather than hitting the brakes, and, when nobody is looking, jumps from the car and pushes it into a parking space. (DMN-Video/editing by: Ian Hamilton)
July 8th, 2008
I walk to work.
Good thing they have showers...I walk to work.
Maybe 4 wheels aren't so bad after all... wickett.org
It only goes to show when people can no longer discriminate on the grounds of race, religion, or sexual orientation, they can improvise and still find someone to hate. - Dave Moulton
and a pool...
Filled up the Kia yesterday morning after the trip to College Station over the weekend: 35.34MPG with the AC on all the time and almost no coasting. Can't complain too much 'cause the SIX never got better than 26. Of course, I never used to drive under the speed limit..... :)
Will see if I can beat my 417 mile tank in Sunny tomorrow morning......
92 Sunny 214k, 95 Dimples, 93 James Bondo, 92 SM (Speedie Jr
Shelley
MSR #1001, SCCA #208822
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