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Spare Causes Front Diff Failure?

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Old 04-05-2004 | 03:10 PM
  #16  
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bemani
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Car Info: 02 WRX/05 Legacy
We're talking about the donut right? Which is not 205/55/16, but something like 135/70/16?
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Old 04-05-2004 | 03:37 PM
  #17  
ish's Avatar
ish
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From: Oakland, CA
Car Info: 2009 wrx & 2000 4runner
Originally posted by go go go
225/40/18 is 637mm diameter
205/55/16 is 631.9mm diameter
it's less than 1% difference in diameter though.
I doubt its enough to cause trouble.

but true, shouldnt have gone more than 50mph and shouldn't have driven 30miles

your symptoms seems similar to mine, I broke transmission by running low on oil (didnt notice the leak from transmission).
Maybe you should check transmission fluid.
yeah for one it is not the difference of a stock tire. its the donut. even if you have similar outer diameters, your contact patch and weights are going to be way off causing a lot more stress on your differentials. there is more to it than just the diameter. plus you should never go over 50mph on a donut and drive the shortest distance possible.
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Old 04-06-2004 | 12:05 PM
  #18  
pre-diddy
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Any difference in tire size will be significant. Even running a few psi difference in left and right tires can cause similar issues.
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Old 04-07-2004 | 06:16 PM
  #19  
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Vicore_Wrx
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Car Info: 2003 WRX, blue
I juat got a flat today
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Old 04-07-2004 | 08:04 PM
  #20  
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Mach5WRX
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Re: Spare Causes Front Diff Failure?
Originally posted by Almost_Stock
After a jaunt back on the freeway at 70 mph, about 30 miles
Are you serious?
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Old 04-08-2004 | 08:49 AM
  #21  
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Fantabulous
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i hope you put the fwd fuse in... otherwise the front diff will burn up.
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Old 04-08-2004 | 11:47 AM
  #22  
RacerZ22
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Originally posted by Fantabulous
i hope you put the fwd fuse in... otherwise the front diff will burn up.
The fuse is only on automatic transmission cars. If yours is a manual there is no way to take it out of AWD. So your spare better be the same size as the tires on the car or you will cause damage to your drive train.
Last edited by RacerZ22; 04-08-2004 at 12:06 PM.
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Old 04-10-2004 | 01:14 PM
  #23  
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Fantabulous
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racer.. didi you check your fuse box? i have a manual and i have it. and i dont understand why it would only be on the slowmatics.
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Old 04-10-2004 | 01:31 PM
  #24  
02silversuby
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I raced a integra on my spare took it up to about 95mph.

and i drove on the tire for a good two weeks.

-Adam
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Old 04-10-2004 | 04:46 PM
  #25  
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MO REX
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Car Info: 02 PSM WRX
Originally posted by 02silversuby
I raced a integra on my spare took it up to about 95mph.

and i drove on the tire for a good two weeks.

-Adam
That doesnt sound like a good idea. The od of the spare is 595.4mm and the factory tires are 631.9 mm (36.5 mm difference). I got a new spare that is 135/80/16 for free and that is 622.4 mm (9.5 mm difference) just incase I have to drive for a long time with the spare on a road trip or something.
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