Coasting with an Auto - Page 5 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Reply
 
Thread Tools Display Modes
 
Old 08-21-2006, 09:42 AM   #41
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
So there's enough current to light an LED? I'm hoping the current draw won't screw with the pulse...
__________________

__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 08-21-2006, 09:44 AM   #42
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
My injector powering lit up my LED very well when I was messing around the other day. I doubt it'll mess with the pulse, I have my superMID hooked it to my #2 injector without issue.
__________________

SVOboy is offline   Reply With Quote
Old 08-21-2006, 09:51 AM   #43
Registered Member
 
omgwtfbyobbq's Avatar
 
Join Date: Jul 2006
Posts: 1,516
Country: United States
Sweet! Probably try this out on friday.
__________________
Quote:
Originally Posted by FormulaTwo
I think if i could get that type of FE i would have no problem driving a dildo shaped car.
omgwtfbyobbq is offline   Reply With Quote
Old 09-24-2006, 11:09 PM   #44
Supporting Member
 
cfg83's Avatar
 
Join Date: Sep 2006
Posts: 1,779
Country: United States
Compaq888 -

Quote:
Originally Posted by Compaq888
this is the reason I stopped coasting with engine off. It can kill the tranny easy, and starter. I hate auto.
I am not sure. Did you stop coasting with the engine off on your auto or your stick?

CarloSW2
__________________
Old School SW2 EPA ... New School Civic EPA :

What's your EPA MPG? http://www.fueleconomy.gov/feg/calculatorSelectYear.jsp
cfg83 is offline   Reply With Quote
Old 03-24-2007, 09:39 PM   #45
Registered Member
 
Traugbot's Avatar
 
Join Date: Mar 2007
Posts: 11
Country: United States
i had a tranny go out in my old car (not from n-bombing) and it is not fun. I got stuck in an intersection, so if n-bombing is bad for your tranny i wouldnt advise doing it
Traugbot is offline   Reply With Quote
Old 04-06-2007, 07:18 AM   #46
Registered Member
 
Join Date: Apr 2007
Posts: 290
Country: United States
Alright, so let's say that I am driving along at 40mph. I am coasting down a hill, and decide to put the car into neutral. I end up going about 50mph by the end of the hill, still in neutral. Without touching the gas, if I were to then, at 50mph, shift the car back into drive, would that hurt the transmission?
Erdrick is offline   Reply With Quote
Old 04-06-2007, 07:52 AM   #47
Registered Member
 
kickflipjr's Avatar
 
Join Date: Sep 2005
Posts: 933
Country: United States
Quote:
Originally Posted by Erdrick View Post
Alright, so let's say that I am driving along at 40mph. I am coasting down a hill, and decide to put the car into neutral. I end up going about 50mph by the end of the hill, still in neutral. Without touching the gas, if I were to then, at 50mph, shift the car back into drive, would that hurt the transmission?
well, you should rev up the RPM (while in neutral before you put it in drive) so they match what you would be at at 50mph (say 2,000rpm) and then put it in drive. Doing that will hurt your car less.

I really think costing with an auto may be more trouble then it is worth (unless you find a long gradual hill).
__________________
2008 EPA adjusted:


Distance traveled by bicycle in 2007= 1,830ish miles
Average commute speed=25mph (yes, that's in a car)
kickflipjr is offline   Reply With Quote
Old 04-06-2007, 08:07 AM   #48
Registered Member
 
Snax's Avatar
 
Join Date: Mar 2007
Posts: 758
Country: United States
The effectiveness of rev matching is probably going to vary by vehicle. Not only that, but torque converters absorb the bulk of it and likely mitigate much of the wear associated with shifting in and out of gear.

Play around with it. Whatever works the most smoothly is the way to do it.

If I were to try to reve-match in our truck, it will clunk aggressively into gear every time at highway speeds. It produces a virtually unnoticeable engagement by simply leaving it alone until the gears are engaged again.
__________________
LiberalImage.com

I think, therefore I doubt.
Snax is offline   Reply With Quote
Old 04-06-2007, 10:47 AM   #49
Registered Member
 
JanGeo's Avatar
 
Join Date: Jan 2006
Posts: 2,442
Country: United States
Send a message via Yahoo to JanGeo
May be that the higher speed of the engine produces a quicker shift from the increase in automatic hydralic pressure. I think unless there is a freewheeling action in the torque converter than rev matching is a good idea. The clutch in top gear would wear much less if the RPM of the engine is closer to the normal RPM for the car speed. I would think that there would not be that many times when you would have to coast at that high a speed - more likely at lower speed when you would be shifting back into drive at less than 30mph. The last thing you want to do going down a mountain is to rely on brakes to slow you down if the drop is big enough leaving it in gear may be a lot safer.
JanGeo is offline   Reply With Quote
Old 04-12-2007, 12:19 PM   #50
Registered Member
 
brucepick's Avatar
 
Join Date: Feb 2007
Posts: 722
Country: United States
Location: Connecticut
Quote:
Originally Posted by Compaq888 View Post
... Whenever you let your foot off the gas the tranny goes automatically into neutral...
As written elsewhere in this thread, I also think it varies with different cars. I put a tach into my car so I could see better what was going on with engine rpms.

My car has auto trans without lockup converter, so ymmv, as always.

Leavng it in D on a nice long downhill coast will see the rpms drop to 1500 and stay there.

Putting it in N for a similar nice long coast will see the rpms drop to about 800. Idling in N when not moving, rpms = 700-800.

My take on it is, coasting in D has the car's momentum spinning the engine via the tranny. It's not fully "engaged" as when your foot is on the gas, but those rpms have to be coming from somewhere. My foot is off the gas so I think it must be the car that's driving the engine. Those coasts seem to lose speed faster than the ones where tranny is in N. That always gives me the best coast. Oh yeah - electric rad fan, so the airflow is NOT driving the engine!

I drive Rte 9 in CT daily, it has loads of long up and down grades where I pulse to about 70-75 going down, and then glide the max possible till I need to help it get up the next hill.
__________________

__________________
Currently getting +/- 50 mpg in fall weather. EPA is 31/39 so not too shabby. WAI, fuel cutoff switch, full belly pan, smooth wheel covers.

Now driving '97 Civic HX; tires ~ 50 psi. '89 Volvo 240 = semi-retired.
brucepick is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuelly Moving to New Servers pb Fuelly Web Support and Community News 4 11-30-2011 10:31 PM
Fuelly Mobile horribly slow on iPhone 3G danielk Fuelly Web Support and Community News 7 07-04-2011 09:26 PM
More SMS Requests zbret Fuelly Web Support and Community News 16 02-03-2011 01:09 AM
long time MPG nut JanGeo Introduce Yourself - New member Welcome 8 01-23-2006 03:33 PM
Parking Brakes and Fuel Economy? Matt Timion Automotive News, Articles and Products 0 10-03-2005 02:23 PM

Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 06:30 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.