Using the emergency tyre...
#1
Using the emergency tyre...
Discovered a puncture this morning. A roofing nail had left its mark in the tread. Installed the dorky emergency tyre - checked the pressure - way too low. Noted it said inflate to 80psi (420kPa). Hauled out trusty emergency pump. Found runs out of puff at about 340kPa (49psi). Anyway, it seemed to be OK at 70kph on the way to the tyre repair guy. I think I need a compressor with more grunt, but on the upside, you can't accidentally over-inflate a normal tyre.
#3
u can uy a slime kit for about $60 from repco which has some slime and a compressor, which is much more capable.
While you're at repco, you may as well but buy some plugs (tyre repair kit) to fix that puncture...
While you're at repco, you may as well but buy some plugs (tyre repair kit) to fix that puncture...
#4
[QUOTEWhile you're at repco, you may as well but buy some plugs (tyre repair kit) to fix that puncture...[/QUOTE]
Good tip, but I don't have the capability to take of the tyre at home (let alone re-balance the wheel as well)
Good tip, but I don't have the capability to take of the tyre at home (let alone re-balance the wheel as well)
#5
Originally Posted by labrat
Hmm, I just googled 420kPa in psi and it came out to 61psi. Someone needs to check out their math!
#6
Hmmmm, digging the spare out and looking at it for the first time in 18 months made me notice something. The space saver isn't balanced. I assume no manufacturer balances them. Why would you bother??!!
#10
Originally Posted by Gomez
....without going back out into the shed, I think it is speed limited to 80Kph..?
How did you go finding another wheel, Andrew?
How did you go finding another wheel, Andrew?
Andrew
#12
Originally Posted by labrat
[QUOTEWhile you're at repco, you may as well but buy some plugs (tyre repair kit) to fix that puncture...
u don't need to take the tyre off the rim for this sort of repair.. nor would you need to rebalance it.. the additional weight of these things are negligable..
Check out the kit and you may surprise yourself ;-)
#13
Originally Posted by skc
Somewhere I picked up that you should not use the spare tire as a spare for the rear. Aparently it can have an harmful effect on the diff. This may be due to the different rim size.
skc
skc
yeah.. but it's only in emrgencies.. to get u to the nearest service sation.. not to be running around town for a week or two..
#15
Originally Posted by skc
Somewhere I picked up that you should not use the spare tire as a spare for the rear. Aparently it can have an harmful effect on the diff. This may be due to the different rim size.
skc
skc
I've never really understood the diff thing. Is this just a forum rumour based on somebody's nervous question, or is there really an issue here??
The difference in effective diameter would have the same effect as going round a corner - one wheel would do slightly more rotations than the other. Now this is exactly what diffs are there for - to allow this to happen - so what's the problem?
Our cars can spend the day going round a circuit all day - in one direction - without blowing up (well, usually anyway! ). They can even do 24 hour endurances on circuits. So what's the big deal about driving home for 40 or 50 ks?? I certainly had no problem when I did it.
I guess with a "limited slip" style of diff you are asking it to work slightly more in one direction than the other. But on a normal drive, there will be corners in either direction to help avoid any "winding up" situation, if that's considered to be the danger.
I would have thought that if you stick to the 80kph recommended speed the only problem would be the boredom and the feeling that it looks pretty stupid (as xxup says). That's all that happened to me anyway.
Why is diff damage or 'wind up' considered to be even a possibility? Is it based on any real feature of our diff, or something that's been brought up, based on potential difficulties with equipment or situations that don't really apply here?? Anybody know?
Cheers, Chris
Last edited by BVD; 12-08-2005 at 10:54 PM. Reason: Senility (word missing)
#16
I agree. Crikey, when you look at the handbook (and the wheel!) there are enough warnings about what not to do. I'm sure if there was a problem using it on the rear I am sure there would be some large red lettering somewhere.
(actually, I'd be more worried about using it on the front!)
(actually, I'd be more worried about using it on the front!)
#17
Actually there is a big warning (hard to spot amongst the other warnings) about using the spare on the rear!!
With old friction type LSD's a different size wheel on the rear would kill it in no time.
I believe the RX8 has a torsion LSD so it shouldn't fail, but you would be subjecting it to increased wear and heating. If it is a five minute drive I would live with it, but if you have to limp back from a jaunt in the country I would do a front rear swap.
Matt
With old friction type LSD's a different size wheel on the rear would kill it in no time.
I believe the RX8 has a torsion LSD so it shouldn't fail, but you would be subjecting it to increased wear and heating. If it is a five minute drive I would live with it, but if you have to limp back from a jaunt in the country I would do a front rear swap.
Matt
#18
Originally Posted by MattRX
Actually there is a big warning (hard to spot amongst the other warnings) about using the spare on the rear!!
I believe that these warnings are there to cover every eventuality, including some sort of bizarre situation caused by an exceptionally dumb driver with an outstandingly good lawyer. I.e. some bozo who leaves it on for weeks and also ignores the 80kph usage limit.
I believe the RX8 has a torsion LSD so it shouldn't fail, but you would be subjecting it to increased wear and heating. If it is a five minute drive I would live with it, but if you have to limp back from a jaunt in the country I would do a front rear swap.
Matt
Matt
If somebody has a genuine technical explanation of the alleged problem, rather than just generalised opinions then I'd be interested to read it. I don't mean that sarcastically, I'm genuinely interested. Don't worry about being technical, I've been qualified as a motor engineer for 35 years, so I should understand the details. And if I don't, I'm not afraid to keep asking questions.
I think that the potential for wear and/or failures has been rather blown out of proportion. If you drive slowly and with care (as you tend to with a spare like that on, believe me!) then I think you'll be just fine, and so will your diff. But, hey, if people prefer being very conservative with their vehicles that's fine too.
Cheers, Chris
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