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Old 01-19-2001, 08:45 AM   #1
CRZ_MSL
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Member#: 1610
Join Date: Jun 2000
Talking Tire pressure

FOr the entire time I have owned my SVX I ran my tires at 32psi/32psi. Then while doing a pressure check I noticed that the current tires have a max psi rating of 45, so I bumpred the pressure up to 42psi all around (to allow wiggle room due to thermal expansion)

WOW!!!! It was SCARY-FUN how fast I could dive into those curves with my foot on the gas. This simple mod (does it count as a mod?) did so much to change the handling of the car.

Naturally, the ride is quite bumpy, but any passengers who don't like it can walk.
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Old 01-19-2001, 11:43 AM   #2
kastle
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Member#: 1457
Join Date: May 2000
Chapter/Region: SWIC
Location: Phoenix, AZ
Vehicle:
1999 Outback Sport
Steel Blue Mica

Post

What brand and size are you running?
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Old 01-19-2001, 08:24 PM   #3
CRZ_MSL
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Smile

I think they are Goodyears, unidirectonal V-rated.

I have head that Subaru changed the factory spec air pressure for the later year cars. I have run equal pressure front/back for most of the time I have owned my SVX. I think the original pressure specs were made with comfort/ride quality in mind, not handling-- sort of like the borderline underinflated Firestones on the Ford SUVs. Higher pressure = better response, but harsher ride.
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Old 01-20-2001, 12:02 AM   #4
immortal_suby
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Member#: 1711
Join Date: Jun 2000
Chapter/Region: South East
Location: Greenville, SC
Vehicle:
140 rogue points!
2013 GBS BRZ Limited 6MT

Post

How does this affect the rolling circumference? Factory spec is 33/29, when my tire pressure is off I notice a slight rumble strip effect at high speeds, feels like the front and rear are fighting eachother. I figured it was the speed sensors showing a difference in speed front to rear due to the different rolling circumference caused by low tire pressure. This is my warning that the tires are getting low. It goes away instantly when I air them back up to specs.
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Old 01-20-2001, 07:12 PM   #5
glenstiles
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Member#: 2827
Join Date: Nov 2000
Location: Woodland, CA
Vehicle:
2002 WRX wagon
Silver, baby, silver

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What is factory tire pressure spec for the later SVXs? I run what the door sill plate says- I think its 33/29. This is on 225/50/16 tires. While we are talking tire tech... Anyone think of running a slightly smaller aspect ratio like 215/50/16 or 225/45/16 to help acceleration on our tall-geared cars? Just a thought...

Glen
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Old 01-20-2001, 11:45 PM   #6
CRZ_MSL
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Post

It would likely help acceleration, and be much cheaper than a gearset change.

The down side is this: Your SVX will sit closer to the ground. I think my SVX sits a bit too low to the ground to begin with. I't VERY irritating to park next to a curb, and find myself unable to open the passenger side door because the door sill is lower than the curb is tall.
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Old 01-21-2001, 07:18 AM   #7
immortal_suby
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Member#: 1711
Join Date: Jun 2000
Chapter/Region: South East
Location: Greenville, SC
Vehicle:
140 rogue points!
2013 GBS BRZ Limited 6MT

Post

The 97 svx stock tire size was 215/55. changing to this size is a 1.8% difference. there's a cool toy at this website to calculate tire sizes and their effect -
http://www.miata.net/garage/tirecalc.html
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Old 01-22-2001, 09:50 PM   #8
glenstiles
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Member#: 2827
Join Date: Nov 2000
Location: Woodland, CA
Vehicle:
2002 WRX wagon
Silver, baby, silver

Post

When my tires wear out, I'm gonna try Kumhos in size 225/45/16. This is a little shorter than stock by 3.5%, and the sidewall is about half an inch shorter. I figure that the pros of slightly better acceleration and less sidewall flex would offset the lowering affect and having the speedo read a little high. 225/40/16 is also available in the Kumhos but may lower the car too much, ie. lowrider look...

Glen
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