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Old 05-07-2012, 03:02 PM   #1 (permalink)
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Shifting habits? mini P&G?

I got my MPGuino installed a couple days ago and using it has made me wonder about shifting. I can't help but notice the instant mpg shooting up while shifting. Has anyone tried spending more time between gears coasting as a sort of mini P&G?

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Old 05-07-2012, 03:34 PM   #2 (permalink)
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Quote:
Originally Posted by pfunk678 View Post
I got my MPGuino installed a couple days ago and using it has made me wonder about shifting. I can't help but notice the instant mpg shooting up while shifting. Has anyone tried spending more time between gears coasting as a sort of mini P&G?
It's only happening because you lift the throttle and the engine rpm drops ... as does the load on the engine (as it's going to idle).

At speed, you're obviously using less fuel when coasting than while accelerating.
If you want to continue accelerating, don't interrupt the process, as you'll lose speed again, and need to re-accelerate to make up for it.

Last edited by euromodder; 05-07-2012 at 03:40 PM..
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Old 05-07-2012, 03:34 PM   #3 (permalink)
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What you say does happen. If I am at high RPM and push in the clutch and take my foot off the gas, the overrun kicks in, and I have infinite MPG until the rpm gets down to idle speed. Then I am at normal engine on coasting.
I have found that engine on coasting MPG is very dependent on your speed. This is because you are using idle fuel. More speed means more miles while burning that fuel.
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Old 05-07-2012, 09:16 PM   #4 (permalink)
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Coasting in neutral my Altima got 60 MPG for every 16 MPH. 48 MPH was 180 MPG.
The Insight got 150 MPG at 16 MPH. 48 MPH was 450 MPG.

You can also calculate your coasting fuel consumption.
The Altima was just under .25 GPH 16/60 GPH
The Insight was right at .11 GPH 16/150 GPH

Coasting fuel consumption may be the same as idle consumption depending on the vehicle

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Old 10-04-2012, 11:11 AM   #5 (permalink)
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I saw the same thing when I hooked up mine. Every time you push in the clutch you get great mileage, I first thought "why not spend more time there?". But like Euromodder stated, you'll use all your fuel savings taking longer to accelerate to speed. Coasting downhill with my clutch in gets me around 120 - 150 mpg @ 55 - 65 mph. Downshifting is giving me an infinite reading. Does anyone know if the Ford Ranger cuts fuel when decelerating in gear or if this reading could be bogus?

Last edited by ChadB; 10-04-2012 at 12:27 PM..
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Old 10-04-2012, 11:20 AM   #6 (permalink)
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Yes, you'll have to re-accelerate through what you just did, but P&G is constantly reaccelerating. Don't worry about it.

When traffic and road conditions allow, I'll stretch those changes. I was going to be out of gear anyway so I might as well make it a glide.
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Old 10-04-2012, 12:20 PM   #7 (permalink)
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I do it when there is traffic in the way:
http://ecomodder.com/forum/showthrea...ift-17489.html
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Old 10-04-2012, 06:15 PM   #8 (permalink)
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I just concentrate on shifting smoothly until it gets to cruising speed. That way I can rev-match it and not have to blip the throttle before putting it back into gear.
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Old 10-04-2012, 06:37 PM   #9 (permalink)
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I try to rev match my cobalt, I tend to skip gears because the blasted thing cant be throttled to any paticular RPM (one of the big disadvantages of drive by wire) This means that I have to wait a relatively long time waiting for the RPMs to slowly hang and drop. I also would love to have an autotragic idle on the MT since to me its just a waste having it idle at 1k when the auto is usually around 600rpms.

I have often thought of buying an HP tuner for the 010 cobalt XFE just to force DFCO to happen instantly when gas pedal TPS=0 and RPMS are above some point. This would speed my shifting, reduce clutch wear (when I am forced to be in a hurry) and it would allow a mini P&G as I shift from 1->3->5.

Anyone have such a device there are a couple things I would love to tweek on the cobalt but I can't justify $500+ to attempt it.

Cheers
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Old 10-04-2012, 11:13 PM   #10 (permalink)
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Quote:
Originally Posted by rmay635703 View Post
I try to rev match my cobalt, I tend to skip gears because the blasted thing cant be throttled to any paticular RPM (one of the big disadvantages of drive by wire) This means that I have to wait a relatively long time waiting for the RPMs to slowly hang and drop. I also would love to have an autotragic idle on the MT since to me its just a waste having it idle at 1k when the auto is usually around 600rpms.

I have often thought of buying an HP tuner for the 010 cobalt XFE just to force DFCO to happen instantly when gas pedal TPS=0 and RPMS are above some point. This would speed my shifting, reduce clutch wear (when I am forced to be in a hurry) and it would allow a mini P&G as I shift from 1->3->5.

Anyone have such a device there are a couple things I would love to tweek on the cobalt but I can't justify $500+ to attempt it.

Cheers
Ryan
Hmmm Megasquirt 2 standalones are less than 500 but they don't have sequential injection...I think they might be able to control the throttle though. Obviously would be a lot of work to adapt.

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