View Full Version : Tyre Pressure
jay-bee'z
11-10-2004, 07:24 PM
Hey guys,
driving along this afternoon, It felt like the drivers side front tyre was very very low on air, so decided to pull over, but i think it might have been an overreaction because the others werent that much better, but still needed air of course, so i pulled into a servo, and the tyre said 144PSi (yokahamas) which to me sounds rediculously high, so i just started filling up the front drivers side tyre with air until it looked not so saggy, and i actually got to about 60psi before deciding to stop.
then for some reason i decided to open the drivers side door to see if it had anything written on a plate, and it did have a Kpa reading which works out to be around 34psi, but to me it still looks saggy on the walls of each tyre, their 15inch stocko honda teg mags, the tyres say radials. so is this correct yes or no, and how much do you put in your tyres ppl?
like is it mean't to have a noticible sag, or im i just being paranoid? and Now im worried that I might have done something to the tyre to which i filled up to 60psi in!, maybe i might of streched the tube or something i dont no, anyone got any helpful thourghts or comments?
Ta.
JB
60 psi is crazy man
how 'saggy' are your tyres man?
got a camera?
take a pic
jay-bee'z
11-10-2004, 07:42 PM
Yeah i no, well 60psi looked normal would u believe, sag disapeared looked nice and firm to me, but seen as thou when i saw it said 34psi, i put it back down to that, so it wasnt actually driven at 60psi, but it was at that level, do u reakon it would have hurt it at all?
yeah i guess i could take a pic, but i guess its just a lil sag, but i mean i spoke to a guy who said radials are mean't to have soft walls kinda thing, so im assuming its normal...but yeah im not sure
Javed
11-10-2004, 07:46 PM
60psi? jesus!
type one
11-10-2004, 08:00 PM
144psi or 14.4psi??
umm buy yourself a "proper" tyre pressure gauge... the one at the servo was probably busted.
If on inspection your tyres are "saggy" then they probably are :)
34psi cold... when the tyre is hot that number will increase... I'm not sure of how much...
Fill your tyres up when their cold... I wouldnt go more than 2psi higher than recommended. It is my understanding that to much psi can lead to serious tyre damage and even blow out when the tyre gets hot...
I've found shell digital tyre pressure gauages to be fairly accurate... try using them.
I should add to that, if you have changed to lower profile tyres... I believe your tyres will require more psi. It may provide the correct psi on the new tyre, if you have changed them to lower profile - it may not though.
Correct me if im wrong anyone =P
jay-bee'z
11-10-2004, 09:27 PM
actually it was at a shell servo/elec pump. and that 144psi figure is actually on the tyre! yokahama, dont no if it might be a US or Jap spec, cause yeah even i know 144 is crazy...but yeah i guess its just a low profile 15inch tyre on the honda mag, sags a little at the sides, when i say sag, its not heaps, but yeah im hoping wacking 60 in it didnt stretch the crap outta somethin within the tyre.
EH? it was 144psi when it looked saggy... but when it filled up it went to 60psi? Doesn't make sense.... make sure its not in KpA either....
Javed
12-10-2004, 06:13 PM
sounds morel ike 144 kPa
jay-bee'z
12-10-2004, 06:47 PM
ok upon closer inspection i read everylittle piece of writing on the tyre, and saw that is says 'Canadian & US Figures Only' or something similar to that. and on the tyre it clearly says 300 k.p.a. / 144psi, which ok thats US spec ive now realized. So inside the drivers door ive found a plate that has a lil bit of info saying, standard 15inch wheels tyre pressure max load 34psi...which ok thats aussie.
now to clear it up, it looked saggy (and it was 27psi), i then filled it up to 34 psi what it should be and it still looks a tiny bit saggy, and it feels soft (not rock hard, but soft). BUT what i did, and this is while i was at the servo, before i saw and knew all this info, i put in 60 psi, so i never actually put 144, but i did put 60psi into one tyre (to which it then looked normal) but then discovered the plate inside the drivers side door stating the 34psi / 230 k.p.a figure and let it back down to 34psi, which all tyres are all the same now what they should be (34psi) but, it still kinda looks a little down on pressure, but maybe this is because i heard somewhere that radials have soft walls in them, (being a little low profile of a tyre too). but when driving im not sure if its my sub-concious but it feels like the front drivers side wheel isn't filled up with air, but it is, so maybe it could be something in the suspension perhaps???
its due for a service so i might take it to honda, let them know.
(is that the best way to go? is honda gonna sting me millions of dollars, or does anyone know of a good place to goto in brisbane for honda servicing?)
SiR JDM
12-10-2004, 06:56 PM
I was told by 2 different mechanics (who i both respect alot) 32 psi and 40 psi
so i chuck mine on 36 :P
ECU-MAN
12-10-2004, 08:51 PM
60 PSi thats Crazy
im suprised teh tyre didnt blow, if you keep driving with 60 PSi in you r tyres you will get excessive tyre wear in the center of your tyre
Javed
12-10-2004, 10:16 PM
there is no difference between psi in aus and the US, its a universal measurement of pressure. Pound per square inch. Its a non-metric measurement, whilst kPa is the metric form.
00dc2
12-10-2004, 11:08 PM
its not this hard!!!
drive to your servo when the tyres are completely cold.. cold!!! and fill them to 34psi (if you have lower profile tyres try 2-4 more psi)
and then see how that feels driving around..
steve_civic
12-10-2004, 11:31 PM
not just that but buy a tire gauge. SOmetimes those servo pumps are dodgy. Also too much or too little air can affect tire wear, fuel economy and handling. Good luck
http://www.bobjane.com.au/pdf/Guide_To_Tyre_Care_And_Safety.pdf
Pretty good detail on tyres...
monstaR
13-10-2004, 08:22 AM
Hey guys,
driving along this afternoon, It felt like the drivers side front tyre was very very low on air, so decided to pull over, but i think it might have been an overreaction because the others werent that much better, but still needed air of course, so i pulled into a servo, and the tyre said 144PSi (yokahamas) which to me sounds rediculously high, so i just started filling up the front drivers side tyre with air until it looked not so saggy, and i actually got to about 60psi before deciding to stop.
then for some reason i decided to open the drivers side door to see if it had anything written on a plate, and it did have a Kpa reading which works out to be around 34psi, but to me it still looks saggy on the walls of each tyre, their 15inch stocko honda teg mags, the tyres say radials. so is this correct yes or no, and how much do you put in your tyres ppl?
like is it mean't to have a noticible sag, or im i just being paranoid? and Now im worried that I might have done something to the tyre to which i filled up to 60psi in!, maybe i might of streched the tube or something i dont no, anyone got any helpful thourghts or comments?
Ta.
JB
I am not sure but I would normally go for 32 psi......... :D
Black R
13-10-2004, 08:41 AM
I have low profile tyres and on the tyre it says MAX load is 50 psi..at the moment i fill it to 45 psi is that OK?
jay-bee'z
13-10-2004, 05:37 PM
not just that but buy a tire gauge. SOmetimes those servo pumps are dodgy. Also too much or too little air can affect tire wear, fuel economy and handling. Good luck
Yeah nice idea, i'll definatly do that. thnx
and Thnx to ATSE, that was a good PDF :)
and Javed, are you sure its the same for US & Aus, cause im 100% sure that my tyre indicates 144psi (and says US, candian figures only)...crazy yes, why, i have no idea.
but yeah all tyres are riding 34psi at the moment, and feels normal i guess. just to put your minds at rest for all those that are following my tyre pressure thread with immense anticipation on the outcome. :)
Thnx all. :honda:
I have low profile tyres and on the tyre it says MAX load is 50 psi..at the moment i fill it to 45 psi is that OK?
From my limited understanding, your tyres can increase by more than 5psi when hot... which would mean it excede 50...
Correct me if im wrong...
=)
ACTI0NMAN-1
13-10-2004, 10:55 PM
for my 15's i run on 37psi in winter and 33psi in summer.. i dont know if it makes a difference but thats just what i do
K3NstyL
13-10-2004, 11:21 PM
why the difference? ambient temperature isnt gonna make squat of a difference (well any noticable) if you drive the car hard, the sidewalls will still soak all the heat from the brakes.
Javed
13-10-2004, 11:36 PM
jay-bee'z : Yep im pretty damn sure. I reckon it says the US and canada thing because most of the rest of the world are on metric now, so as not to confuse you with kPa. It is interesting it says that on the tyre tho, that is a huge pressure rating. Hmmmm
jay-bee'z
14-10-2004, 06:31 PM
jay-bee'z : Yep im pretty damn sure. I reckon it says the US and canada thing because most of the rest of the world are on metric now, so as not to confuse you with kPa. It is interesting it says that on the tyre tho, that is a huge pressure rating. Hmmmm
Tis Indeed, imagne if some poor lady actually put 144psi in a set of 15's :confused: it would be like a scene out of die hard w/ a vengence when the bomb goes off in the train station...(well maybe not that bad, but it would definatly blow; u can quote me on that)
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