Go Back   EcoModder Forum > EcoModding > Hypermiling / EcoDriver's Ed
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 01-25-2012, 10:07 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jan 2012
Location: Denver
Posts: 4

Green Machine - '04 Saturn Ion Quad Coupe
90 day: 31.77 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
Trouble with "Pulse and Glide"

Hello everyone,

This is my first post and I am relatively new to hypermiling. In order to achieve the most efficiency from my vehicle I try to employ as many techniques as I can.

Two techniques which I would really like to use are "pulse and glide" as well as turning off my engine at stoplights, although, I am having some difficulty.

I drive a 2004 Saturn Ion1 with CVT. Here are the issues I am having with these techniques:

1. When starting my engine it will rev to ~2,500 RPM. I have to wait a moment for it to drop down to idle before I can begin moving. This is frustrating not only because it takes too long and I do not wish to hold up traffic but also because it seems that fuel is being wasted on startup.

2. After shutting the engine OFF I have no problem gliding for a while but it seems I cannot restart it until the vehicle is STOPPED and in PARK.

So my questions are: Is there a way to sefely restart the engine while the vehicle is still in motion? Possibly a way to rig a quick start up? Also, is there a way to avoid the initial "rev" when starting the engine up?

Thanks for the input!

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 01-25-2012, 10:13 PM   #2 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,018 Times in 1,302 Posts
Not a good idea to coast with the engine off with a CVT, you could seriously damage the transmission. Coast in neutral with the engine running. The transmission needs hydraulic pressure to work properly, even in neutral. You could be spending big bucks on a repair or replacement transmission, say $5000.

Best to leave the engine running in neutral when coasting. It should start in neutral if you shut it off at a light, but do that only when it has completely stopped and you will probably need your foot on the brakes (not sure about foot on the brakes).

regards
Mech
  Reply With Quote
Old 01-25-2012, 10:20 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Jan 2012
Location: Denver
Posts: 4

Green Machine - '04 Saturn Ion Quad Coupe
90 day: 31.77 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
Thanks,

I was not aware that shutting the engine off at speed could damage the transmission. "The more you know"

So once at a stop, I should put it in park, shut off the engine, hold the brakes, shift to neutral and restart my engine in time for the light to change?
  Reply With Quote
Old 01-25-2012, 10:30 PM   #4 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,018 Times in 1,302 Posts
Try to see if it will start in neutral. I think you need to have your foot on the brake for it to start, but if you do it should start in neutral. Then you can shut the engine of and start it in neutral at a light. I would not mess with it unless you know its going to be at least 15 seconds or more. If it revs up that high it's probably not worth it.

regards
Mech

Last edited by user removed; 01-25-2012 at 11:38 PM..
  Reply With Quote
The Following User Says Thank You to user removed For This Useful Post:
Scorched (01-25-2012)
Old 01-25-2012, 10:51 PM   #5 (permalink)
EcoModding Lurker
 
Join Date: Jan 2012
Location: Denver
Posts: 4

Green Machine - '04 Saturn Ion Quad Coupe
90 day: 31.77 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
Thanks for the valuable information. I will give it a shot next time I hit the road. Obviously some lights are a lot longer than others and it's not worth shutting the engine off if it is too short. Of course there are always thoes lights that seem to last forever as well.
  Reply With Quote
Old 01-25-2012, 10:57 PM   #6 (permalink)
GRU
Master EcoModder
 
GRU's Avatar
 
Join Date: Oct 2011
Location: Windsor ON Canada
Posts: 373

silver bullet - '00 Honda Civic
90 day: 34.41 mpg (US)
Thanks: 21
Thanked 36 Times in 31 Posts
Since your engine revs high when you start the car, i wouldn't even bother shuting it off at lights or when coasting. Shut if off only if you will be parked for at least 45 seconds.

The reason your engine revs high at startup might be because you have a bad Idle air control valve.
__________________

  Reply With Quote
Old 01-25-2012, 11:16 PM   #7 (permalink)
EcoModding Lurker
 
Join Date: Jan 2012
Location: Denver
Posts: 4

Green Machine - '04 Saturn Ion Quad Coupe
90 day: 31.77 mpg (US)
Thanks: 1
Thanked 0 Times in 0 Posts
GRU I will look into that.

I bought the vehicle at about 60,000 miles from my father who purchased it new. This behavior has been consistent since it came from the factory and is also exhibited in other Saturn models from my personal expierence. It has always bewildered me. Maybe a replacement part will fix the issue.

  Reply With Quote
Reply  Post New Thread


Tags
pulse and glide, stoplight

Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com