Go Back   EcoModder Forum > EcoModding > DIY / How-to
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-17-2010, 06:14 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Sep 2009
Location: North Carolina
Posts: 32
Thanks: 0
Thanked 3 Times in 2 Posts
RWD rear motor , regen braking

Is it legal to have in the REAR ONLY REGEN BRAKING.. While in the front still disc brakes.... Since depending on the weight distribution my design would have the rear brakes might not the be biggest impact on my stopping power since the weight shifts forward.


Also could regen braking be used with the brake pedal in conjunction with the front disc brakes EITHER , slight braking use regen while harder braking uses both...

Or braking period uses both...

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-17-2010, 09:17 PM   #2 (permalink)
Left Lane Ecodriver
 
RobertSmalls's Avatar
 
Join Date: Aug 2008
Location: Buffalo, NY, USA
Posts: 2,257

Prius C - '12 Toyota Prius C
Thanks: 79
Thanked 286 Times in 199 Posts
I don't see any legal issues with this, as long as you retain your hydraulic brakes at all four wheels and a mechanically operated emergency brake? Also, what kind of regen setup do you have, and how many g's of braking does it produce. If it's small/weak like most regen setups are, like the one in my Honda is, then your brake management system becomes simple, depress the pedal just enough to light up the brake lights and the regen kicks in at full strength which is never really too powerful... then you just press harder if you want the hydraulic brakes to kick in... Simple!
  Reply With Quote
Old 05-18-2010, 06:34 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Sep 2009
Location: North Carolina
Posts: 32
Thanks: 0
Thanked 3 Times in 2 Posts
Its a future project that hasnt been started I dont know how strong it would be. But would it be road legal to have only 2 wheel hydraulic brakes those being in the front and the only way of braking in the rear be regen braking.

But its nice to see that it would work that way , whether or not I could only use 2wheel hydraulics or not. If I had to I would just have to deal with 4 wheel.
  Reply With Quote
Old 05-28-2010, 07:05 PM   #4 (permalink)
Basjoos Wannabe
 
ShadeTreeMech's Avatar
 
Join Date: Apr 2009
Location: Arkansas
Posts: 870

The Van - '97 Mercury Villager gs
90 day: 19.8 mpg (US)

Lyle the Kindly Viking - '99 Volvo V70
90 day: 25.82 mpg (US)
Thanks: 174
Thanked 49 Times in 32 Posts
Irregardless of legality, it would be a bad idea to totally depend on a regen braking system as you've described without having the hydraulics there in case something goes wrong.

As mentioned above, you can set it up by making it kick in when the brake lights go on very easily, and I'd think it possible with the right gearing to make a good strong traction braking system to charge an onboard battery and reduce your dependance on the friction brakes. I've thought about doing something like this on my minvan (lots of space underneath and a dead axle anyway) but I would consider losing my brakes a bad idea.

FWIW locomotives have used this system for years for going down long gradients, but they don't use it as the sole means of stopping.
__________________
RIP Maxima 1997-2012


Quote:
Originally Posted by jamesqf View Post
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.

Last edited by ShadeTreeMech; 05-30-2010 at 05:48 PM..
  Reply With Quote
Old 05-28-2010, 10:56 PM   #5 (permalink)
Master EcoModder
 
NeilBlanchard's Avatar
 
Join Date: May 2008
Location: Maynard, MA Eaarth
Posts: 7,907

Mica Blue - '05 Scion xA RS 2.0
Team Toyota
90 day: 42.48 mpg (US)

Forest - '15 Nissan Leaf S
Team Nissan
90 day: 156.46 mpg (US)

Number 7 - '15 VW e-Golf SEL
TEAM VW AUDI Group
90 day: 155.81 mpg (US)
Thanks: 3,475
Thanked 2,950 Times in 1,844 Posts
In general, you get ~70% of the braking power from the front, and only ~30% from the rear. So braking distance would suffer badly with rear braking only.
__________________
Sincerely, Neil

http://neilblanchard.blogspot.com/
  Reply With Quote
Old 05-28-2010, 11:21 PM   #6 (permalink)
EcoModding Lurker
 
Join Date: Sep 2009
Location: North Carolina
Posts: 32
Thanks: 0
Thanked 3 Times in 2 Posts
Its a little bit more rear sides than 70-30 being a rear engine vehicle but true. I guess I can do with all wheel disc brakes , just doing best to minimize weight on design.
  Reply With Quote
Old 05-30-2010, 05:49 PM   #7 (permalink)
Basjoos Wannabe
 
ShadeTreeMech's Avatar
 
Join Date: Apr 2009
Location: Arkansas
Posts: 870

The Van - '97 Mercury Villager gs
90 day: 19.8 mpg (US)

Lyle the Kindly Viking - '99 Volvo V70
90 day: 25.82 mpg (US)
Thanks: 174
Thanked 49 Times in 32 Posts
I would consider your idea a good one, just keep the OEM brakes as is and add on the regen braking system to help out. And if you have ABS you can make the regen brake more aggressive than otherwise.

__________________
RIP Maxima 1997-2012


Quote:
Originally Posted by jamesqf View Post
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.

Last edited by ShadeTreeMech; 05-30-2010 at 06:08 PM..
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do Rear Spoilers / Wings Help Any? Jammer Aerodynamics 27 12-30-2021 10:56 AM
Tuft Testing - "Vortekz" vortex generators on 2003 Jetta Rear Window Deezler Aerodynamics 40 07-15-2017 01:56 AM
Dual Fuel, electric rear wheel drive, gasoline front wheel drive bucknmusky DIY / How-to 42 12-27-2012 01:59 AM
Aerodynamic lift- A real problem Hermie Aerodynamics 175 12-05-2010 07:56 PM
Rear Alignment: Drivability vs Economy Southcross EcoModding Central 11 04-22-2009 09:40 PM



Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com