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

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 09-26-2010, 10:36 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Jul 2010
Location: Toronto, ON
Posts: 13

Jet - '99 Suzuki Swift Hatchback
Thanks: 0
Thanked 0 Times in 0 Posts
Tire Pressure Question

So...

My 1999 Suzuki Swift says in the manual to fill the tires too 32 psi, and my front tires have a max of 35 PSI and my rear are around 50 psi.

...What should I fill them too for better fuel economy?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 09-26-2010, 10:49 PM   #2 (permalink)
Wiki Mod
 
Weather Spotter's Avatar
 
Join Date: Nov 2009
Location: Midland MI, USA
Posts: 2,042

Max - '14 Ford C-Max SEL
Thanks: 228
Thanked 304 Times in 210 Posts
Welcome to the fourm!

I would start with 40-44PSI or max sidewall if they are lower than that.

For other mod ideas take a look at the wiki: Main Page - EcoModder
__________________
  Reply With Quote
Old 09-26-2010, 11:05 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Jul 2010
Location: Toronto, ON
Posts: 13

Jet - '99 Suzuki Swift Hatchback
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Weather Spotter View Post
Welcome to the fourm!

I would start with 40-44PSI or max sidewall if they are lower than that.
Thanks!

So I should go over the max stated on the front tires (35)?

Can I set the tires at different pressures (higher for the back, lower for the front)?

Also, is the max sidewall different from the max PSI listed on the tire?
  Reply With Quote
Old 09-26-2010, 11:09 PM   #4 (permalink)
Wiki Mod
 
Weather Spotter's Avatar
 
Join Date: Nov 2009
Location: Midland MI, USA
Posts: 2,042

Max - '14 Ford C-Max SEL
Thanks: 228
Thanked 304 Times in 210 Posts
What tire has a max side wall of only 35PSI? You can go higher but you run risks of handling issues, and tire wear. Try it and see if it helps. If the back is rated for higher I would try them all at 40PSI.
__________________
  Reply With Quote
Old 09-26-2010, 11:22 PM   #5 (permalink)
EcoModding Lurker
 
Join Date: Jul 2010
Location: Toronto, ON
Posts: 13

Jet - '99 Suzuki Swift Hatchback
Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by Weather Spotter View Post
What tire has a max side wall of only 35PSI? You can go higher but you run risks of handling issues, and tire wear. Try it and see if it helps. If the back is rated for higher I would try them all at 40PSI.
The fronts are rated at 35. I'll try them all at 35 first, and then try to bring them up too around 40.
  Reply With Quote
Old 09-27-2010, 05:48 AM   #6 (permalink)
Tire Geek
 
CapriRacer's Avatar
 
Join Date: May 2008
Location: Let's just say I'm in the US
Posts: 794
Thanks: 4
Thanked 388 Times in 237 Posts
As a Noob, you have not experienced the sometimes acrimonious discussions concerning inflation pressure in tires. Here's what we agree on:

Increasing inflation pressure:

1) Improves fuel economy
2) Hurts ride quality

Here's what we have disagreement on:

Increasing inflation pressure:

3) Hurts tire wear
4) Hurts traction (This can be subdivided into dry traction, wet traction, hydroplaning resistance, and snow traction)
5) Increases the risk of impact damage
6) Increases the risk of vehicle rollover

You should read the discussion threads so you get a sense of the degree of disagreement and why there is disagreement. That way you can make up your own mind.
  Reply With Quote
Old 09-27-2010, 08:53 AM   #7 (permalink)
EcoModding Lurker
 
Join Date: Sep 2010
Location: Puerto Rico
Posts: 28

Saber Rolla - '98 Toyota Corolla VE

White Yaris - '13 Toyota Yaris L
Thanks: 2
Thanked 1 Time in 1 Post
I've increased the tire pressure to 44psi and saw better mpgs
but once @ 50psi or so, bounces to much with **** on the road it actually hurt my mpgs
  Reply With Quote
Old 10-14-2010, 06:04 PM   #8 (permalink)
EcoModding Lurker
 
Join Date: Jul 2010
Location: Hampshire (the old one)
Posts: 29

Merc Estate - '01 Merc W210 E320CDi Estate Elegance
90 day: 37.56 mpg (US)
Thanks: 2
Thanked 1 Time in 1 Post
Quote:
Originally Posted by acropora1981 View Post
So...

My 1999 Suzuki Swift says in the manual to fill the tires too 32 psi, and my front tires have a max of 35 PSI and my rear are around 50 psi.

...What should I fill them too for better fuel economy?
Personally I would never go over the sidewall max. If you want to go over the 35psi you're sidewalls say is max, then get new sidewalls.

Secondly, while we're talking replacing front tyres, always put new tyres on the back (unless you're chaning all 4), regardless of wether the car is FWD, RWD or 4x4. Rear end skids can be fatal, front end skids are much much safer.. unless your name is michael schumacher.

Derek
(running 45psi all round on 50psi max sidewalls... oh and my owners manual for my merc says if you pump the tyres up for a max load, you can safely drive after unloading without dropping pressures.. max load pressure at rear is 50% higher than min pressure)
  Reply With Quote
Old 10-14-2010, 11:40 PM   #9 (permalink)
eco....something or other
 
Join Date: Jul 2009
Location: Colfax, WI
Posts: 719

wood hauler - '91 Ford F-250
Team Pontiac
90 day: 18.97 mpg (US)

Rav - '06 Toyota Rav4 Base
90 day: 26.52 mpg (US)
Thanks: 39
Thanked 61 Times in 46 Posts
put the front tires on the back and the backs on the front. The front should have more weight on it and would take the extra pressure better. I would swap tires and run 45 front and 35 rear.
__________________



1991 F-250:
4.9L, Mazda 5 speed, 4.10 10.25" rear
  Reply With Quote
Old 10-15-2010, 10:24 AM   #10 (permalink)
Hypermiler
 
PaleMelanesian's Avatar
 
Join Date: Dec 2007
Location: Texas
Posts: 2,321

PaleCivic (retired) - '96 Honda Civic DX Sedan
90 day: 69.2 mpg (US)

PaleFit - '09 Honda Fit Sport
Team Honda
Wagons
90 day: 44.06 mpg (US)
Thanks: 611
Thanked 433 Times in 283 Posts
Quote:
Originally Posted by IsaacCarlson View Post
put the front tires on the back and the backs on the front. The front should have more weight on it and would take the extra pressure better. I would swap tires and run 45 front and 35 rear.
I agree.

__________________



11-mile commute: 100 mpg - - - Tank: 90.2 mpg / 1191 miles
  Reply With Quote
Reply  Post New Thread


Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Top 5 most fuel efficient tires (Lowest Rolling resistance: LRR) blackjackel General Efficiency Discussion 144 01-25-2016 11:39 PM
Discussion on tire efficiency Ernie Rogers General Efficiency Discussion 69 12-27-2014 01:17 PM
"Inflation pressure does not affect grip": Autospeed article. orange4boy EcoModding Central 158 05-06-2010 03:29 PM
Need report refs for tire pressure benefits Ernie Rogers EcoModding Central 7 04-20-2010 01:31 PM
Tire pressure (of winter tires) tasdrouille General Efficiency Discussion 20 08-12-2009 01:38 AM



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