Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-01-2014, 06:54 PM   #1 (permalink)
EcoModding Apprentice
 
SilverCrown9701's Avatar
 
Join Date: Aug 2014
Location: Texas
Posts: 140

SilverCrown - '01 Toyota Camry LE
Team Toyota
90 day: 35.32 mpg (US)
Thanks: 109
Thanked 11 Times in 9 Posts
Question DWL/Pulse and Glide/Torque Lockup in an Automatic vehicle

Hello,

I noticed recently from reading this forum that driving with load is more beneficial to automatics versus using cruise control in areas with rolling hills.

I'm curious as to actually how one drives with load to increase mileage...?
I drive 55 MPH on the highway as well...but I am really struggling to receive better fuel economy in 20-40 MPH zones in town.


DWL...

1.) Do you keep a constant pressure on the accelerator, allowing my speed to drop down to 45-50 MPH and then allow gravity to increase my speed up to 60 MPH keeping the same throttle pressure?...

OR...

2.) Do you keep a constant pressure on the accelerator on the way up the rolling hill, allowing my speed to drop down to 45-50 MPH and then take my foot off the accelerator and coast in gear with DFCO??...


Pulse and Glide...

1.) How do you pulse and glide in an automatic without damaging your transmission in city and highway driving??...


Torque Converter Lockup...

1.) Is it better to keep the transmission within the torque converter lockup range while performing EITHER technique or is it ok to allow my speed and gears to fall below this top gear/OD range??...

__________________
The name "Camry" is an Anglicized phonetic transcription of the Japanese word kanmuri meaning "crown".



  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-01-2014, 07:59 PM   #2 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,023 Times in 1,304 Posts
On hills of shallow grade I try to pulse uphill and coast downhill. In an auto tranny equipped car coast in neutral with the engine idling. In some cases when the grade is very slight, I'll pulse downhill to maintain a higher average speed. While coasting with the engine running is not as good as engine off, in most cars that coast will still yield mileage of over 100 MPG to as high as 400 MPG depending on your idle consumption amount and your coasting speed (example @ idle consumption .25 GPH, speed 60 MPH= 240 MPG).

My Sentra reengages without the toruqe converter locked up and I have done it without any issues at speeds as high as 70MPH. If your transmission does not like that type of reengagement then try rev matching with a little throttle "blip" when reengaging.

Pulse and glide is very effective when your average speed is lower that your torque converter lockup point, which in my Sentra is about 42 MPH. If your tranny really hates to reengage at the end of your glide then I would probably just not do it. It helps a lot if you have a tachometer which can tell you which gear the tranny is reengaging to. Typically it's a smooth operation and it was in the Toyotas I have owned (06 Corolla and 04 Scion XB).

It's always better to stay in lockup, but if your average speed is too low the P&G engine on. Never glide with the engine off in any auto transmission that requires the torque converter to be rotating for tranny lubrication. The potential for catastrophic transmission failure outweighs any possible benefit.

I accelerate very gradually, which cost very little in mileage, then coast in neutral and take advantage of the 100+ MPG coasting, particularly on downhills of almost any grade. If the grade is steep enough for your speed to increase significantly, then think backwards and reach the peak of the hill at a speed thatcresults in your speed at the bottom to not be so high as to risk a ticket. Of course all of this is done with respect for other vehicles which may react agressively to your driving with large speed variations. Adjust your technique to inconvenience others the least unitl their agressive driving becomes obnoxious and you feel compelled to let them know you do not appreciate it.

regards
Mech
  Reply With Quote
The Following 4 Users Say Thank You to user removed For This Useful Post:
Daox (09-04-2014), jeff88 (09-02-2014), Joggernot (09-02-2014), tyronasauras (09-01-2014)
Old 09-01-2014, 08:13 PM   #3 (permalink)
EcoModding Apprentice
 
SilverCrown9701's Avatar
 
Join Date: Aug 2014
Location: Texas
Posts: 140

SilverCrown - '01 Toyota Camry LE
Team Toyota
90 day: 35.32 mpg (US)
Thanks: 109
Thanked 11 Times in 9 Posts
Quote:
Originally Posted by Old Mechanic View Post
On hills of shallow grade I try to pulse uphill and coast downhill. In an auto tranny equipped car coast in neutral with the engine idling. In some cases when the grade is very slight, I'll pulse downhill to maintain a higher average speed. While coasting with the engine running is not as good as engine off, in most cars that coast will still yield mileage of over 100 MPG to as high as 400 MPG depending on your idle consumption amount and your coasting speed (example @ idle consumption .25 GPH, speed 60 MPH= 240 MPG).

My Sentra reengages without the toruqe converter locked up and I have done it without any issues at speeds as high as 70MPH. If your transmission does not like that type of reengagement then try rev matching with a little throttle "blip" when reengaging.

Pulse and glide is very effective when your average speed is lower that your torque converter lockup point, which in my Sentra is about 42 MPH. If your tranny really hates to reengage at the end of your glide then I would probably just not do it. It helps a lot if you have a tachometer which can tell you which gear the tranny is reengaging to. Typically it's a smooth operation and it was in the Toyotas I have owned (06 Corolla and 04 Scion XB).

It's always better to stay in lockup, but if your average speed is too low the P&G engine on. Never glide with the engine off in any auto transmission that requires the torque converter to be rotating for tranny lubrication. The potential for catastrophic transmission failure outweighs any possible benefit.

I accelerate very gradually, which cost very little in mileage, then coast in neutral and take advantage of the 100+ MPG coasting, particularly on downhills of almost any grade. If the grade is steep enough for your speed to increase significantly, then think backwards and reach the peak of the hill at a speed thatcresults in your speed at the bottom to not be so high as to risk a ticket. Of course all of this is done with respect for other vehicles which may react agressively to your driving with large speed variations. Adjust your technique to inconvenience others the least unitl their agressive driving becomes obnoxious and you feel compelled to let them know you do not appreciate it.

regards
Mech
Thank you for your reply!


I have a relative who owns a 2008 Nissan Sentra CVT, so I can relate to your post.

So far the way I have been testing DWL is keeping the pedal pressure consistent and allow my speed to lessen up a rolling hill then allowing gravity to accelerate my car back up to speed. On the highway, it varies between 45-60 MPH on rolling hills and 55 MPH on flat sections.

Sometimes if I notice that after cresting a hill, I still continue to slow down so I adjust my throttle slightly until I gradually begin accelerating to my desired speed.

I have only had luck coasting in gear down hills with medium steep grades until my speed tapers off when I have to reapply acceleration.
I am leery of constantly shifting my automatic into Neutral for coasting in fear of wearing out the gear box and transmission parts so I have not tried it much.
This is all without an UltraGauge.


Am I doing this wrong?
__________________
The name "Camry" is an Anglicized phonetic transcription of the Japanese word kanmuri meaning "crown".



  Reply With Quote
Old 09-01-2014, 08:32 PM   #4 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,023 Times in 1,304 Posts
I don't see anything wrong with your current technique and considering the cost of a transmission repair, if you are not comfortable with coasting in neutral then don't do it.

I have been doing it for a long time with no problems, but then I could probably get mine repaired fairly cheap.

regards
Mech
  Reply With Quote
Old 09-01-2014, 08:35 PM   #5 (permalink)
EcoModding Apprentice
 
SilverCrown9701's Avatar
 
Join Date: Aug 2014
Location: Texas
Posts: 140

SilverCrown - '01 Toyota Camry LE
Team Toyota
90 day: 35.32 mpg (US)
Thanks: 109
Thanked 11 Times in 9 Posts
Quote:
Originally Posted by Old Mechanic View Post
I don't see anything wrong with your current technique and considering the cost of a transmission repair, if you are not comfortable with coasting in neutral then don't do it.

I have been doing it for a long time with no problems, but then I could probably get mine repaired fairly cheap.

regards
Mech

Awesome!

So far I'm at 413 miles and my gas needle is halfway empty. If I used cruise control, it would be around the 285-300 mile mark on the odometer. It has an 18.5 gallon tank.
__________________
The name "Camry" is an Anglicized phonetic transcription of the Japanese word kanmuri meaning "crown".



  Reply With Quote
Old 09-01-2014, 10:28 PM   #6 (permalink)
XYZ
Banned
 
Join Date: Jan 2013
Location: nowhere
Posts: 533
Thanks: 31
Thanked 86 Times in 69 Posts
Quote:
Originally Posted by Old Mechanic View Post
I don't see anything wrong with your current technique and considering the cost of a transmission repair, if you are not comfortable with coasting in neutral then don't do it.

I have been doing it for a long time with no problems, but then I could probably get mine repaired fairly cheap.

regards
Mech
Nothing beats hearing an honest response here.

I'll add what I know: You can coast in neutral in virtually any car that has an automatic transmission. Any detriment to the transmission will only occur when shifting back into drive. However if you coast to a stop or a near stop (10 MPH or less) before shifting back into Drive, it won't harm your transmission. As far as I know this works with all automatics, no matter how old the vehicle is.
  Reply With Quote
Old 09-04-2014, 10:50 AM   #7 (permalink)
EcoModding Apprentice
 
SilverCrown9701's Avatar
 
Join Date: Aug 2014
Location: Texas
Posts: 140

SilverCrown - '01 Toyota Camry LE
Team Toyota
90 day: 35.32 mpg (US)
Thanks: 109
Thanked 11 Times in 9 Posts
I DID IT!

I drove 504 miles this past trip cycle in mixed traffic and averaged 37.4 MPG!!!

This is the most I've ever earned and I'm very proud of myself!

Excuse my excitement, I'll calm down lol. I just can't believe how well I did in such a big car as the Camry. WOOHOO! My biggest changes were implementing DWL and not using air conditioning. I've listed my fuel up in my garage along with what I did differently from my last trip cycle.

My new goal is to reach 40 MPG average
__________________
The name "Camry" is an Anglicized phonetic transcription of the Japanese word kanmuri meaning "crown".



  Reply With Quote
The Following User Says Thank You to SilverCrown9701 For This Useful Post:
mcrews (09-04-2014)
Old 09-04-2014, 11:40 AM   #8 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,180

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,479
Thanked 2,546 Times in 1,536 Posts
Woohoo, congrats!
__________________
Current project: A better alternator delete
  Reply With Quote
Old 09-04-2014, 11:58 AM   #9 (permalink)
Master EcoModder
 
mcrews's Avatar
 
Join Date: Oct 2009
Location: Texas
Posts: 3,523

The Q Sold - '02 Infiniti Q45 Sport
90 day: 23.08 mpg (US)

blackie - '14 nissan altima sv
Thanks: 2,203
Thanked 662 Times in 477 Posts
cant imagine the a/c would cost too much w a big V8

edited: cant imagine I confused this with the crown vic poster.....

edited#2: his screen name is "CROWN".....Come on....give me a vowel!!!!!
__________________
MetroMPG: "Get the MPG gauge - it turns driving into a fuel & money saving game."

ECO MODS PERFORMED:
First: ScangaugeII
http://ecomodder.com/forum/showthrea...eii-23306.html

Second: Grille Block
http://ecomodder.com/forum/showthrea...e-10912-2.html

Third: Full underbelly pan
http://ecomodder.com/forum/showthrea...q45-11402.html

Fourth: rear skirts and 30.4mpg on trip!
http://ecomodder.com/forum/showthrea...tml#post247938

Last edited by mcrews; 09-04-2014 at 12:11 PM..
  Reply With Quote
The Following User Says Thank You to mcrews For This Useful Post:
SilverCrown9701 (09-04-2014)
Old 09-04-2014, 12:03 PM   #10 (permalink)
Administrator
 
Daox's Avatar
 
Join Date: Dec 2007
Location: Germantown, WI
Posts: 11,180

CM400E - '81 Honda CM400E
90 day: 51.49 mpg (US)

Daox's Grey Prius - '04 Toyota Prius
Team Toyota
90 day: 49.53 mpg (US)

Daox's Insight - '00 Honda Insight
90 day: 64.33 mpg (US)

Swarthy - '14 Mitsubishi Mirage DE
Mitsubishi
90 day: 56.69 mpg (US)
Thanks: 2,479
Thanked 2,546 Times in 1,536 Posts
Hes running a 4 cylinder Camry.

__________________
Current project: A better alternator delete
  Reply With Quote
The Following 2 Users Say Thank You to Daox For This Useful Post:
mcrews (09-04-2014), SilverCrown9701 (09-04-2014)
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com