Tire pressure KDW2

merc123

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Jan 27, 2003

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#1

• Nov 21, 2006

• #1

I have 295/35/18's and I have 40 PSI. I seem to have some trouble keeping them hooked up and I'm thinking it's the tire pressure. What would I lower it to in order to get better traction and still keep highway stability?

 

Mustang5L5

That is…until I whipped out my Bissell

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Feb 18, 2001

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#2

• Nov 21, 2006

• #2

That's a lot of pressure.

Stock tire pressure is 30psi with a 245

With a 295, you could run a lower pressure since the footprint is larger but the cars weight has not changed. You'd have to experiment, but 27-30psi would be the range

 

merc123

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#3

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• #3

Oh, that could be why. I thought it was 38 stock.

 

Mustang5L5

That is…until I whipped out my Bissell

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#4

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• #4

merc123 said:

Oh, that could be why. I thought it was 38 stock.

Click to expand...

The tire pressure decal is behind the gas door. Don't ask my why Ford put it there

 

CobraRed_96_GT

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#5

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no KDWII's are diff, they have a max at 51psi ( to seat it at install) but average psi is like 39-42. I have my KDWII's fronts at 40 and my backs at 38-39

 

CobraRed_96_GT

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#6

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Mustang5L5 said:

The tire pressure decal is behind the gas door. Don't ask my why Ford put it there

Click to expand...

recomended psi for ford supplied tires..

 

merc123

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#7

• Nov 21, 2006

• #7

CobraRed_96_GT said:

no KDWII's are diff, they have a max at 51psi ( to seat it at install) but average psi is like 39-42. I have my KDWII's fronts at 40 and my backs at 38-39

Click to expand...

My KDW2's took 75 psi to seat. I have 38 in front and 40 in back.

 

CobraRed_96_GT

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#8

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• #8

merc123 said:

My KDW2's took 75 psi to seat. I have 38 in front and 40 in back.

Click to expand...

yeah mine took about 65 but they are all 275's, theres another thread in tech here about traction and he runs his w/ like 28, thats pretty low. Im pretty sure 36-39 is where you want to be for performance

 

merc123

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#9

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I'll play around with it. I'll drop it 2 PSI and see how it holds up. It seems like the "wear" on the tires is more is odd too. I get wear like this:
W = Wear
C = Center
--= Tread
| = Edge

|--W--C--W--|

 

Rickyll7

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Dec 16, 2005

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#10

• Nov 21, 2006

• #10

any psi over 32-36 is rediculous for a passenger sized car.

 

Mustang5L5

That is…until I whipped out my Bissell

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#11

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• #11

CobraRed_96_GT said:

no KDWII's are diff,

Click to expand...

WHy would they be any different?

 

Mustang5L5

That is…until I whipped out my Bissell

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#12

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• #12

merc123 said:

I'll play around with it. I'll drop it 2 PSI and see how it holds up. It seems like the "wear" on the tires is more is odd too. I get wear like this:
W = Wear
C = Center
--= Tread
| = Edge

|--W--C--W--|

Click to expand...

A really good way to check is buy one of those laser temp guns....an accurate one. Go drive your car for a while, get out and shoot the tires across the tread and check for equal temp.

If the center is hotter than the outsides, your pressure is high and you need to drop pressure. If the outsides are higher, then you need to add air.

If you are wearing more in the center now, that's a pretty good sign you need to decrease pressure as the tire is bulging out

 

drag0nfan's04GT

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#13

• Nov 21, 2006

• #13

Correct me if I'm wrong, but doesn't plus sizing your tires require you, or suggest that you, add a couple of PSIs? From my understanding, it has to do with the load index of the different sizes of tires. They talk about it briefly on Tire Rack and Discount Tire Direct in the info section.

That laser temp gun idea is cool. I think I need a new toy...I mean tool.

 

merc123

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Jan 27, 2003

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#14

• Nov 21, 2006

• #14

Mustang5L5 said:

A really good way to check is buy one of those laser temp guns....an accurate one. Go drive your car for a while, get out and shoot the tires across the tread and check for equal temp.

If the center is hotter than the outsides, your pressure is high and you need to drop pressure. If the outsides are higher, then you need to add air.

If you are wearing more in the center now, that's a pretty good sign you need to decrease pressure as the tire is bulging out

Click to expand...

It's not really wearing in the center. It's wearing in between the center and side. Here's a pic (the red is the wear)

 

Mustang5L5

That is…until I whipped out my Bissell

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#15

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• #15

That's weird. I don't have an answer for that type of wear

 

SaleenGT2001

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#16

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• #16

that is due to over inflation.
i work at a tire shop, and i'm sure you should NEVER run 40 psi in your tires!! the pressure on the sidewall is the MAX a tire can hold. it doesnt matter how much it takes to seat a tire. hell, i've put 120 psi in one to seat it, that doesnt mean you need 50 psi to run it.

just run 32 psi and you will be fine. anythiung over taht is just stupid. 40-50 psi is for 2500 series trucks! the size doesnt matter you can run a 215 or a 295 and they will still be the same PSI.

 

SaleenGT2001

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#17

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CobraRed_96_GT said:

no KDWII's are diff, they have a max at 51psi ( to seat it at install) but average psi is like 39-42. I have my KDWII's fronts at 40 and my backs at 38-39

Click to expand...

no they are not!!
you can run any brand or type of tire on the same car at the same PSI. as you said that is the MAX pressure. and you can excede that limit to seat them. trust me i have been doing low pro's for the past 4 years.

 

Rickyll7

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Dec 16, 2005

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Nov 21, 2006

#18

• Nov 21, 2006

• #18

SaleenGT2001 said:

that is due to over inflation.
i work at a tire shop, and i'm sure you should NEVER run 40 psi in your tires!! the pressure on the sidewall is the MAX a tire can hold. it doesnt matter how much it takes to seat a tire. hell, i've put 120 psi in one to seat it, that doesnt mean you need 50 psi to run it.

just run 32 psi and you will be fine. anythiung over taht is just stupid. 40-50 psi is for 2500 series trucks! the size doesnt matter you can run a 215 or a 295 and they will still be the same PSI.

Click to expand...

+1

 

Superhereaux

chicks make me feel inadequate

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#19

• Nov 21, 2006

• #19

i run 32 all around




easiest way to check if your over inflated is to leave two nice 20ft long tire tracks (up to you to decide how) and check the width of the markings you left behind

 

0

007

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#20

• Nov 21, 2006

• #20

40 psi is silly hard - no wonder you have no traction. I run my rears 275/35/18 at 32. Fronts a little higher because they have very little sidewall 265/35/18s, maybe 36 psi.