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basshead Profile
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Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: BlackThunda NSW Meet-up 12-07-2008


It also appears to be the exact same location on the bash-plate that has copped some damage as well.

You might want to check your flex pipe and/or the bend at the bottom of the pre-cat (where the exhaust does the 90 degree bend at the bottom of the engine bay) to see if there's any more significant damage done there. I suppose you'd know by now if there was, as engine performance could suffer.

I spent over an hour trying to get all the caked mud out from under the car with the gurney this afternoon, and giving the X-Trail a well-deserved wash. I didn't have time to polish it though. Thankfully I didn't notice any nasty scratches.


Re: the blue tyres. Probably should search/start a new thread - anyone got any ideas what causes it? I couldn't tell mine were blue due to all the mud on them. Now I've mostly cleaned them, they are blue. I have a feeling they may have overheated on the few short bitumen trips we did during the day, travelling up to 90kph with low pressures (rememeber I was running only about 22PSI). How long could you drive at speed on bitumen before damage is done to the tyres/overheating?



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Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_YokoGeoA/T-S_TBS_bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory.
19/Jul/2008, 6:34 pm Link to this post Send Email PM   Send Private Message MSN Yahoo Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: BlackThunda NSW Meet-up 12-07-2008


quote:

basshead wrote:
Re: the blue tyres. Probably should search/start a new thread - anyone got any ideas what causes it?



Here is an explanation...

When the tyre is underinflated, although it puts more rubber on the road, the carcass flexes more than it was designed to, the tread it supports overheats, the rubber wears out faster and you lose optimal grip. You can often spot an overheated tyre because the wearing surface goes a very lovely blue black colour



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19/Jul/2008, 7:09 pm Link to this post Send Private Message MSN Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6093
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Re: BlackThunda NSW Meet-up 12-07-2008


A few bike forums I have read mention that once the tyre starts to "blue" it means that the oil in the rubber has started to dry out and the rubber goes hard and looses grip. Not much after that the tyre usually needs replacing.
It is usually caused by too many hot/cold cycles in the tyres.

Keep an eye on them.

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Kev X450(c) T30 Guru
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19/Jul/2008, 10:25 pm Link to this post Send Email PM   Send Private Message Blog
 
basshead Profile
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Date Registered: 02-2004
Location: Panania, Sydney
TOTAL POSTS: 2852
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Re: BlackThunda NSW Meet-up 12-07-2008


quote:

jalalski wrote:

quote:

basshead wrote:
Re: the blue tyres. Probably should search/start a new thread - anyone got any ideas what causes it?



Here is an explanation...

When the tyre is underinflated, although it puts more rubber on the road, the carcass flexes more than it was designed to, the tread it supports overheats, the rubber wears out faster and you lose optimal grip. You can often spot an overheated tyre because the wearing surface goes a very lovely blue black colour




It's not the "wearing surface" that has gone blue, but the sidewalls. Still, that doesn't mean to say they haven't overheated. I should've jumped out and felt them after the few short bitumen stints.

Definitely time to move this discussion to a relevant thread, as I was going to add that I never got blue tyres from race days, evfen though the tyres got very hot, but then the pressures were normal, too.


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Rich. X-013(c)
'04 S2 ST Auto. Nudge_roofracks_tow_tints_Lightforce_GME_YokoGeoA/T-S_TBS_bashplate_50mm-spacer-lift
Click here to see >300MB of photos and videos All For His Glory.
20/Jul/2008, 8:25 am Link to this post Send Email PM   Send Private Message MSN Yahoo Blog
 
Naff Profile
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Date Registered: 09-2005
Location: QLD
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Re: BlackThunda NSW Meet-up 12-07-2008


When I last went on a more hard core-ish 4WD outing, the guys muddies went blue within half hour of being out in mud pools.

Are you sure it is due to wear Jalal?

I got the impression it is just a mineral in the mud that causes it. But then the whole drying out/no oil makes a lot of sense since mud would have that effect (hence the ladies have mud facials).

Another reason why I don't think it is wear... they don't stay blue. After a couple of weeks they were all back to normal.

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21/Jul/2008, 10:49 pm Link to this post Send Email PM   Send Private Message MSN
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094
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Re: BlackThunda NSW Meet-up 12-07-2008


quote:

Naff wrote:
Are you sure it is due to wear Jalal?



Overheating rather.



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21/Jul/2008, 11:26 pm Link to this post Send Private Message MSN Blog
 
Tony0 Profile
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Date Registered: 04-2006
Location: Coorparoo
TOTAL POSTS: 84
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Re: BlackThunda NSW Meet-up 12-07-2008


Last time we went off road (to Jimna State Forest on a camping trip), I didn't deflate the tyres, the track wasn't too extreme but it was muddy and wet in sections, but we came out the other end with blue tyres (sidewalls). My thought is it is something to do with the mud..... or maybe the pressure washer emoticon

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Tony
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22/Jul/2008, 10:31 pm Link to this post Send Email PM   Send Private Message
 


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