Post by: i30Dave on July 05, 2008, 02:49:06
I was surprised to see they were at 37psi. The sticker in the
door trim says 32 for 17" wheels. I know some people on here
are using 34 - 36psi. What pressures are people using and what
psi would be the maximum you would put in safely.
Post by: Dazzler on July 05, 2008, 06:19:26
I checked my "Alloy" spare when cleaning out my baby yesterday and they had around 46PSI in it (dropped it back to 38PSI) I can understand allowing a bit for deflation over time but thought that was bit excessive.
Cheers,
Dazz
Post by: TheBunyip on July 05, 2008, 08:27:29
In these days of ever increasing fuel costs most drivers sooner or later encounter the advice that under inflated tyres can cost significant fuel consumption. Research in the EU has shown it to be quite a problem. http://www.greencarcongress.com/2007/03/study_underinfl.html
The subject of "Tyre Pressures" seems to be one that most ignore and a few get very very excited about. For most of my driving career I was one of the former. In my search for Automotive Engineering Wisdom (which I have but in very small measure :evil:
After reading some heated exchanges about Tyre Pressures on other Car Forums I decided to see what Car Bibles had to say. There is a very long article (and I do mean long) on Tyres on Car Bibles so I decided to work through it. http://www.carbibles.com/tire_bible.html
Wait for it... I am nearly there!! :(
Anyone else think he is on to something and fancy experimenting with raised Tyre pressures on their i30
Post by: Shambles on July 05, 2008, 10:31:29
Hey Bun, thanks for the Bible bashing links
Post by: Dazzler on July 05, 2008, 11:17:05
amd others I'm still thinking up....
Post by: Chemist on July 05, 2008, 11:29:01
I have 205/55 R16 (KUMHO SOLUS KH15) tires on my i30.
When I first checked the pressure, it was over maximum of
44 Psi in all 4 tires (46-47 Psi)! :?: :roll:
And I did like he said, but then front tires looked a bit deformed, like there
is not enough pressure (probably because of heavy diesel engine)...
So, what to do? Recommended tire pressure is obviously to low, especially when talking about front tires.
What do you think? Maximum -10% theory or what?
Post by: Dazzler on July 05, 2008, 11:33:42
I have Hankook 16" tyres which I believe to be the equivalent of yours... as I've said I find 36 PSI about right.. fills out the tyres nicely (firm but acceptable ride and handling)
My tyres were over inflated when I got my car in March (also over 40PSI from memory) and I found that too firm...
Rgds,
Dazz
Post by: eye30 on July 05, 2008, 12:34:26
Can't under or over tyre pressue sometimes be a contributory factor in causing accidents.
If the Police when examining the vehicle found that this may have contributed towards the accident, even if it wasn't your fault, then may be yours and the other parties car insurance company could refuse to deal with the claim and void the policy.
If no insurance then the only recourse would be to sue them/you.
Does anyone have any views?
Post by: i30manUK on July 05, 2008, 18:07:33
Post by: Hemmi on July 05, 2008, 19:48:13
Quote from: "i30manUK"
I'm currently running my tyres (18" wheels) at 35psi/2.4bar - This is a bit of a guess, because the handbook and door labels only give pressures for the smaller wheels. What pressure are you using, Hemmi?
I'm not sure, I'll check when I can.
Do you have a tyre pressure monitoring system TPMS on your Hyundai i30. I'm always getting the TPMS light and the dealer says that they've been having trouble with all the cars with it, it's to sensitive they say. I took my i30 to them last week and they calibrated it again but now the lights up again.
Post by: i30manUK on July 05, 2008, 20:05:05
Quote from: "Hemmi"
Quote from: "i30manUK"Do you have a tyre pressure monitoring system TPMS on your Hyundai i30.
Yes, I have TPMS - no problems with it so far. Start a new topic on the subject, so you can see if anyone else is having problems with it.
Post by: Thumper on July 06, 2008, 09:54:49
A bit harsh, but I go for outright economy, not comfort! :lol:
(I have to write up the sub install, HiD 3000k Golden yellow fog light install, LED light install, USB HD testing.)
Post by: ozsnowman on July 06, 2008, 13:54:17
Post by: davet on July 06, 2008, 14:11:08
Post by: eye30 on July 06, 2008, 16:25:11
Reading the postings of putting additional psi in tyres I can see the benefits, better ride, better mpg etc but I've always err'd on the side of caution.
Tyre manufacturers give psi when cold and this must be for a good reason - safe use of the tyre.
But question I have always wondered is why does the same tyre have different psi on different cars?
As the car travels the tyres warm up and therefore the psi increases.
If you are running at + psi when cold, then when warm you are increasing the psi signicicantly running the risk of tyre failure, or are you.
It may be worth members posting cold and hot psi's to see the increase and then compare to the tyre manufactures safe working limits.
Any views by others?
Post by: Lakes on July 06, 2008, 20:47:00
cheers
Eye 30, just read the last part of your post, they say always set your tyre pressure cold m8, low inflated tyres will increase the tyre pressure more to high inflated tyres as they will increase there temperature by a lot more. also with our strict speed limits and those limits being relatively slow, we don't have to worry too much here m8.but 40 psi is safe and less chance of tyre failure than low inflation
Also forgot to mention, have your tyre pressure test equipment checked regularly as the one's at service stations are not very accurate , i found the digital type to mostly be closest. i take my gauge to be tested every month. so i know what i really have in my tyres. ever tried helium gas?
.
Post by: 130MAN on June 07, 2009, 13:14:58
One question, Does the Hyundai i30's have a monitor sensor to tell you the tyres are low?
Post by: eye30 on June 07, 2009, 14:51:30
I check manually with a type pressure gauge every couple of weeks and run at 32 as stated on the sticker on the body you see when you open the drivers door.
Post by: Dazzler on June 07, 2009, 23:22:04
I don't have the model with Tyre Pressure Monitoring System (TPMS)
I check manually with a type pressure gauge every couple of weeks and run at 32 as stated on the sticker on the body you see when you open the drivers door.
Hi Eye, have you considered trying 34 or 36 psi... it doesn't seem to effect the ride but should improve your economy a little bit...
Post by: Pip on June 08, 2009, 02:07:31
Post by: Goldfish_8 on June 08, 2009, 14:13:41
Have to say that some of the pressures mentioned do seem to be rather high, I would have thought verging on over inflation, cause excess wear to the centre of the tyre, yes improving economy, as less tyre in contact with the road, but reducing the tread patch in contact with the road thus reducing grip and safe handling.
With the TPMS, it seems to warn when the pressure drops to about 25PSI.
Mark
Post by: Pip on June 08, 2009, 14:31:21
Personally, I don't think it is possible to over-inflate the (front) tyres in any sensible way.
Post by: Si on June 08, 2009, 14:32:57
Any ideas what is correct - the handbook or the sticker??!!
Thanks
Si
Post by: eye30 on June 08, 2009, 17:08:05
Any ideas what is correct - the handbook or the sticker??!!
I follow the sticker. Like you 32 no matter the loading.
I run at 32 (cold as don't forget the PSI will increases with heat from movement) because that's what is says on the sticker.
If I was involved in an accident the boys in blue may check settings etc as part of the road accident report and I may then be charged if they deem the car is unroad worthy due to psi above manufacturers stated psi. :exclaim:
Post by: Lakes on June 08, 2009, 20:24:22
i like 38 front 36 rear. my tyres are lasting too. you also need to have the gauge you use to test pressure checked for accuracy, a lot are in acurate. i just ask the tyre guy to check mine against what he is useing. check tyres every week .
how offten do you check yours Eye? and do you know if your gauge is accurate?
i've never seen a Cop here with a tyre pressure gauge yet :lol: just a breath test gauge.
Post by: freakzoide on June 09, 2009, 08:40:25
I use 2.5bar (~36PSi) on the front and 2.2bar (~32Psi) in the rear.
Post by: Phil №❶ on October 20, 2011, 22:21:58
Have just read this discussion and was looking for advice on pressured for our diesels. It seems everyone is doing / advising their own theories and I'm more confused than b4.
btw, if a tyre is 38 psi cold, how much would the pressure increase in highway cruising (summer) temps
There would have to be an argument for not over inflating if the car was in an accident & the cops took it to their yard for investigation. Where would we stand criminally & insurance wise. :scared:
Post by: beerman on October 21, 2011, 01:44:18
I run mine at 38 front and back, my reasons are;
1) Both my cars spend most of their time on the highway hence do not see the rougher side roads.
2) I did a care course where we absolutely drove the cars hard, multiple emergency stops, emergency lane changes, skid pan and the like. They ran their tyres at 42.
3) I do not notice much drop in ride quality.
4) If I (or more likely I don't get into the wives car for a while) am slack and don't check the tyres for a while, there is a good chance that the pressure will be ok.
5) I have run this pressure for a long time, and the tyres all wear flat, hence there is no hint of over inflation wear. In fact my tyres seem to last a long time (though again, this would no doubt be contributed to by highway milage, the last set on my EL lasted 80,000k).
I suspect the topic of tyre pressure is much like the topic of what tyre to use, many opinions abound, for every person who offers an opinion, there are two waiting to shout them down.
Post by: Surferdude on October 21, 2011, 10:05:33
surferdude
Have just read this discussion and was looking for advice on pressured for our diesels. It seems everyone is doing / advising their own theories and I'm more confused than b4.
btw, if a tyre is 38 psi cold, how much would the pressure increase in highway cruising (summer) temps
There would have to be an argument for not over inflating if the car was in an accident & the cops took it to their yard for investigation. Where would we stand criminally & insurance wise. :scared:
We pretty much covered all this here... https://www.i30ownersclub.com/forum/index.php?topic=11288.0 (https://www.i30ownersclub.com/forum/index.php?topic=11288.0)
Nothing's changed but the topic we are in now started back in 2008 I think. Even back then, lakes was advocating what Beerman and I are saying.
However, I can't tell you what pressure a tyre increases to when it warms up. I can tell you it varies in relation to the pressure at which it starts cold. It's irrelevant as long as it starts its day within range.
There are some "givens".
1/ Vehicle manufacturers are only concerned with ride quality. They don't want a new car owner thinking their car rides harshly, so they'll recommend the lower end of the acceptable range for any given tyre/rim/vehicle combination. If tcnhe tyre wears out rapidly or unevenly, they'll simply refer you to the tyre manufacturer.
2/ Tyre manufacturers are in an extremely competitive market. The only chance they have to impress you is with the tyre which come on your car. And they recognise that you'll base your replacement decisions on how you feel about their tyres at the end of their life. In other words, you won't necessarily remember that you thought they were a bit harsh when you drove out of the showroom 40 or so thousand klms ago.You will notice if they're worn down evenly, and they gave you good mileage. And how they handled in difficult or emergency situations. Pressures at the higher end of the scale will provide a better overall experience for you than those at the lower end of the scale.
3/ Every tyre has a "maximum allowable pressure" As long as you aren't exceeding that there can be no issue with your insurance or legalities. Just went through something similar with Qld Transport today. So it's a topical question.
I think you'll find it's around the low 40's (psi) for most car tyres. But it should be on it somewhere. I have never heard of a situation where "excess" tyre pressure became an issue in an accident or a vehicle inspection. Which is not to say someone, somewhere hasn't.
Post by: moxey on October 21, 2011, 16:37:41
Post by: baroudeur on October 21, 2011, 18:06:35
Personally, I don't think it is possible to over-inflate the (front) tyres in any sensible way.
Then perhaps you are living in cloud cuckoo land? Over inflation can lead to loss of grip earlier than a correctly inflated tyre.
Car and tyre manufacturers spend millions on research. Do you really think they do not know what they are doing?
In the event of a serious accident it may well be that an under or over inflated tyre may be considered a contributory factor.
Post by: Pip on October 22, 2011, 14:53:46
Interesting that you should wake this old thread but I stand by what I said.
Personally, I don't think it is possible to over-inflate the (front) tyres in any sensible way.
Then perhaps you are living in cloud cuckoo land? Over inflation can lead to loss of grip earlier than a correctly inflated tyre.
Car and tyre manufacturers spend millions on research. Do you really think they do not know what they are doing?
In the event of a serious accident it may well be that an under or over inflated tyre may be considered a contributory factor.
Underinflation (of the front tyres) is much more likely to be the cause of poor stopping distance in an emergency braking event: I expect overinflation would be negligible.
I'm not going to quote any supporting evidence (but I'm sure I could find it :wink:) partly because it's almost obvious that when you brake (really, really) hard the weight transfer to the front wheels is several times the normal load such that these tyres would ideally be inflated to maybe 50psi or even more. I'm happy to use 40psi.
It's a compromise between what (harshness) can be tolerated for normal driving and what needs to be available in an emergency.
Perhaps if the road is wet/icy the ability to generate sufficient friction to cause the weight transference is limited... but even so, if this were the case, then no tyres will grip well, no matter what the footprint.
Post by: Surferdude on October 22, 2011, 21:49:35
I wonder though, if in wet conditions, a bit less pressure wouldn't be more useful as the footprint would be spread out a bit more.
On sand for instance, 4WDs lower their pressures sometimes down around 15 psi to widen the footprint and give more traction (as well as help the tyres not to spin and dig holes)/
Post by: RamblinR on October 31, 2011, 09:18:05
Picked up my new car just under a week ago and decided to check the tyre pressure today.
Tyres were filled to 36psi by the dealer.
Post by: Surferdude on October 31, 2011, 10:17:25
New here but been reading a bit here and there.
Picked up my new car just under a week ago and decided to check the tyre pressure today.
Tyres were filled to 36psi by the dealer.
Sensible dealers up here on the Sunny Coast. :cool:
Post by: snakoil on November 03, 2011, 16:35:09
over here the i30 comes with hankook solus (Crappy soft tires) and Running 34psi would be no problem on 17"
however when I used to do lapping I would have real sport ire like Falken Azenis I would run 28 on the street and 45 on the track
(actually 45 only for the back to compensate the oversteer and weight distribution of a FWD car)
32 on the street with stiff sidewall was just not tolerable.
Post by: wardfam on November 16, 2011, 09:28:23
Post by: MGS on December 20, 2011, 23:14:32
After quite a bit of driving It seemed really noisy and bumpy especially on motorway trips, I'd heard this was mainly due to the Hancook tyres and assumed they were just rubbish. I had to do an emergency stop and the ABS kicked in really early and I travelled way further than I thought I should have and nearly collided with the other vehicle.
After this I did some more testing (emergency stops) at those pressures after checking on line and with my hand book and I wasn't happy with the grip or noise so I lowered to 34psi front 32 psi rear (I only drive myself in the car and don't carry any weight) I must say the noise has lowered to a more comfortable level and the grip is way better than before on stopping, cornering is also fine. The wet grip is excellent with the esp "on" as well, so maybe those Hancook tyres are not so bad after-all, Anyway I have settled on the above psi as a good compromise on those tyres on the i30 diesel. :)
Post by: tla on December 21, 2011, 02:04:38
Mine came with pressures at around 45psi. It felt like Fred Flintstone's granite-tyres. They're now at 38 front, 35 rear.
Post by: Surferdude on December 21, 2011, 02:45:59
I think Baradeur is right. I have an i30 Diesel 1.6, and it came with 42psi in the Hancook tyres when supplied new, and I'm convinced this is way too much pressure.
After quite a bit of driving It seemed really noisy and bumpy especially on motorway trips, I'd heard this was mainly due to the Hancook tyres and assumed they were just rubbish. I had to do an emergency stop and the ABS kicked in really early and I travelled way further than I thought I should have and nearly collided with the other vehicle.
After this I did some more testing (emergency stops) at those pressures after checking on line and with my hand book and I wasn't happy with the grip or noise so I lowered to 34psi front 32 psi rear (I only drive myself in the car and don't carry any weight) I must say the noise has lowered to a more comfortable level and the grip is way better than before on stopping, cornering is also fine. The wet grip is excellent with the esp "on" as well, so maybe those Hancook tyres are not so bad after-all, Anyway I have settled on the above psi as a good compromise on those tyres on the i30 diesel. :)
Baradeur is partly correct. 42 is at the very upper level of what is acceptable but then, 34 is at the very bottom of acceptable. Given others' issues on here with tyre wear on their diesels, I'd suggest that tla is pretty much spot on with 38 / 35
Sorry, I meant to clarify the "partly correct" comment. he says, Car and tyre manufacturers spend millions on research. Do you really think they do not know what they are doing?
The point here is that car and tyre manufacturers, despite all their millions spent on research, DO NOT AGREE on the optimum pressure. Which is why we're having this discussion. :whistler:
Post by: Asterix on December 21, 2011, 22:02:10
I have 2,5 bar / 36 psi in both front and rear tyres (15") all the time except when towing the caravan, than I increase rear to 40-42 psi.
We are 4 people in the car every day when driving to work, so most of my driving is with approx. 250 kgs extra weight.
Post by: druggist on May 24, 2012, 08:32:22
Great day and we both had a great refresher on the joys of ABS and ESP.
They were adamant that cars should be running at least 40psi for maximum grip, and also for best sidewall heat dispersion in the tyre.
BTW I wish this forum used Australian and not US spelling in it's spell checker.
Post by: Surferdude on May 24, 2012, 08:34:23
Just home from doing a defensive driving course with my wife, through Driver Dynamics http://www.driverdynamics.com/ (http://www.driverdynamics.com/)
Great day and we both had a great refresher on the joys of ABS and ESP.
They were adamant that cars should be running at least 40psi for maximum grip, and also for best firewall heat dispersion in the tyre.
BTW I wish this forum used Australian and not US spelling in it's spell checker.
Did you mean "sidewall"?
Post by: Shambles on May 24, 2012, 09:12:09
BTW I wish this forum used Australian and not US spelling in it's spell checker.I'll look into it, cobba
Post by: asathorny on May 24, 2012, 09:18:40
Just home from doing a defensive driving course with my wife, through Driver Dynamics http://www.driverdynamics.com/ (http://www.driverdynamics.com/)
Great day and we both had a great refresher on the joys of ABS and ESP.
They were adamant that cars should be running at least 40psi for maximum grip, and also for best sidewall heat dispersion in the tyre.
BTW I wish this forum used Australian and not US spelling in it's spell checker.
I think you meant to say *ENGLISH* :Shocked:...... and I agree with you :rofl: :rofl: :rofl: :rofl:
Post by: druggist on May 24, 2012, 09:29:31
Rippa Mate BeaudddddyBTW I wish this forum used Australian and not US spelling in it's spell checker.I'll look into it, cobba
Post by: bryanj86 on May 27, 2012, 01:10:36
Post by: Bitsumishi on May 28, 2012, 13:40:51
I did notice the car handled better with the extra 2psi which kinda surprised me!
Post by: snakoil on May 29, 2012, 12:28:52
I had my tires at 35psi and could not stand it, was thinking of changing the car as this was too harsh for all the bumps we have in the pavement.
Dropped it to 30psi and I can at least tolerate the suspension now.
This car is still more harsh than all the others I've owned before and weirdly it has the bigger wheel/fender gap I ever owned.
Post by: Bitsumishi on June 01, 2012, 09:38:01
Post by: kabukiman on July 01, 2012, 01:16:32
I checked my tyres today to see what pressure was in them.
I was surprised to see they were at 37psi. The sticker in the
door trim says 32 for 17" wheels. I know some people on here
are using 34 - 36psi. What pressures are people using and what
psi would be the maximum you would put in safely.
for my 205/55s on 16"s hyundai told me 35psi
the door says 32 but it does on nearly every new car. it will differ where you buy and drive your car.
35 has always worked for me on every car, except my old peugeot, I used to use 39 psi
Post by: komaterpillar on July 01, 2012, 04:38:23
37 psi in the front and 34 psi in the rear (cold)
Post by: Talking Hoarse on July 01, 2012, 07:59:51
Also .... very early days (daze?) yet and I will likely develop this furter on another more appropriate thread, but there has been a lot of banter about tyre noise of standard fit Hankook's fitted to the i30 - which I reckon is already quite a noisy car. Mine has just had a new steering column fitted to resolve the knocking noises, and I think it is now much quieter reavelling on motorway. If my memory serves me correctly the bush where the column passes through the bulkhead now has a great piece of (maybe) soundproofing around it, maybe makes the difference.
Post by: Dazzler on July 01, 2012, 08:45:57