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Old 09-26-2010, 10:36 PM   #1 (permalink)
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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?

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Old 09-26-2010, 10:49 PM   #2 (permalink)
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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
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Old 09-26-2010, 11:05 PM   #3 (permalink)
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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?
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Old 09-26-2010, 11:09 PM   #4 (permalink)
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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.
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Old 09-26-2010, 11:22 PM   #5 (permalink)
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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.
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Old 09-27-2010, 05:48 AM   #6 (permalink)
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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.
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Old 09-27-2010, 08:53 AM   #7 (permalink)
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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
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Old 10-14-2010, 06:04 PM   #8 (permalink)
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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)
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Old 10-14-2010, 11:40 PM   #9 (permalink)
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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.
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Old 10-15-2010, 10:24 AM   #10 (permalink)
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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.

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