I checked the tyre pressures on my gtr,whilst cold.ie prior to use,they were both low in pressure,I used two types of gauges.topped up to 42psi front & rear.when I was on my way I went through the options on the screen,it was reading 47psi front & rear.i pulled over & let a little air out,I know when the tyres warm up the psi increases.Which gauge would you go by.the gauges i used were a digital one & a dial one.i let the bike stand for an hour & set the front & rear at 41psi.
Stick to the proper guages. The handbook says not to rely on the TPS and only use it as a guide
Funnily enough mine did exactly the same today. A few days ago when it was quite cold I inflated my tyres to 43psi. I always do them 1psi over to allow for any loss of air taking the adapter off the valve. I only did a short distance today but as soon as I set off they were redaing 45psi and once I got onto a dual carriageway and sped up they were reading 46/47psi. Far too high is that.
I'm sure Asif did a tyre pressure guide depending on ambient temperature as to what you should inflate to, or am I dreaming? Either way if you inflate when its extremely cold expect your running pressures to be excessive.
Hi
I don't think the GTR suffers with tyre pressures that much, however.
I have three guages - a cheap dia guage, an expensive dial gauge and a digital tyre guage.
if I used either of the dial guages, the TPS always reads +1/+2 psi high on the TPS. However if I use the digital (freebee from fastbikes mag), It is spot on, so I use this when the tyres are cold.
If set on the low side of 42 (guesswork and experience - digital guage is also 0.5psi) the pressure stays pretty much correct all the time.
however, a couple of days later, I will loose 1-2psi, but nothing I'm too concerned about.
however, given all that, I run the Z750R at about 30-32psi - manufacturers recommends 36F 42R.... But I would like to think I know what I'm doing! :-)
Neil
i remember asifs tyre chart and noted that the changes in tyre pressure with ambient pressures to be pretty much on the mark.
when the handbook says check tyre pressure when cold they are referring to the tyre and not a freezing cold day . if its only 5 degrees outside then you will see an increase in 4 or so degrees when they warm up
last year i set my tyre pressures at at approx 18 degrees to 42 psi before i set off to europe and even in Italy when it was 35 dgress never saw the psi rise above 44
In my experience, the dash readings are always a bit higher than what the pressure actually is. What is more important for me is that the dash will indicate when you have a tyre that is low on pressure. It works ( as I found out recently ) and that is what I think the benefit is of the dash readout.
Deon
Quote from: Deon on March 04, 2013, 04:49:17 AM
In my experience, the dash readings are always a bit higher than what the pressure actually is. What is more important for me is that the dash will indicate when you have a tyre that is low on pressure. It works ( as I found out recently ) and that is what I think the benefit is of the dash readout.
Deon
:agree: use the dash reading as a guide only, I have a couple of gauges and TBH they all vary slightly, I like my tyres set at 42psi cold, they will inevitably warm up when the bike is on the move :yes:
I use a calibrated air gauge at work to 42 and the bike always shows 46/47
P1xV1/T1=P2xV2/T2 where P = pressure , V = volume and T = temperature in Kelvin,
So assuming the volume stays the same, or approximately the same, as it is dictated by the volume of the tyre carcass, then P1/T1=P2/T2
So if P1= 41psi, and T1 = 4 degrees centigrade or 277 K
then at 20 degrees centigrade or 293 K we have P2=( 41/277) x 293 =43 psi
So if you adjust your tyre pressure to 41psi at 4 centigrade, it will rise to 44 psi at 20 centigrade
Unavoidable, ladies and gents, it's combination of Boyles law and Charles' Law. Simple physics :innocent: :wink: :laugh:
- aiyayayaya !
:laugh:
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Just an interesting observation that some of you might find usefull. I was at a rally and the dash showed rear tyre low pressure warning ( 2.2 Bar ) - about 32 PSI. Not near a garage to inflate tyre so got out the puncture repair kit with the Co2 cannisters in. Instruction leaflet states that 1 cannister will inflate tyre to 3 Bar ( about 43 PSI ). Well, too cut a long story short, it took 2.5 cannisters to get my tyre to 2.8 Bar (41 PSI ) from 2.2 Bar.
As the kit only contains 3 cannisters, I was fortunate that it got me home OK. However, I have now bought 6 cannisters that I have put in the repair kit. If I had no pressure in the tyre to start with, 3 cannisters would not have been enough to inflate the tyre.
Useless info but might just make you go out and get some more cannisters in your kit !!
Deon
A few years ago I had the same issues with CO2 cannisters when I had the CBF1000. Puncture in rear tyre, which was then sealed and I tried inflating the tyre with C02 cannisters, it took 3 of them to get any where near a pressure I could ride to a garage to inflate the tyre properly.
These days I carry around a small tyre pump compressor in the pannier, which has come in hand a couple of times when friends have had punctures when out on a ride or on a tour.
Steve
- the experience of the above two gentlemen is the reason why i don't ever rely on CO2 canisters. Imagine being able to patch but not able to inflate the tyre ....
- a small electric pump (and a backup mini bicycle pump for long trips) is gold.
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While were on the subject of tps's, how much do the sensors cost to replace?
About £165 each before fitting costs :angry:
Quote from: KeVstrom on March 10, 2013, 06:42:09 PM
While were on the subject of tps's, how much do the sensors cost to replace?
Quote from: Burchy on March 10, 2013, 06:45:47 PM
About £165 each before fitting costs :angry:
Yeah, I was just going to say a :censored: fortune!
What duh! Im currently negotiating a deal on a 2010 GTR, i suspect due to the age that the batteries in the sensors will be just about depleted so i asked the price incase i need to mention that. Wasnt expecting that much. How long do they usually last?
You could find that in extreme cold conditions the display could flash a warning up saying 'LOW BATTERY' (front or rear) but it will normally go off after a few miles once the tyres warm up. I had this only the other week on my 11 plate GTR and I also had it on my older GTR 2007 plate. I called Kawasaki a couple of weeks ago re this and they said the battery should last 4 or 5 years which is the norm however this period can be decreased by frequent stop, starts whereby the sensors have to work more for that initial assessment.
If the battery dies during the warranty period Kawasaki will at their discretion replace the battery, 99% of the time they will replace. Is this bike still under warranty, (extended warranty). My advice would be to get the battery's replaced by the dealer, although its not a standard fix, it can be done. There are some on here who have sucessfully soldered in new battery's.
I have had the same situation as LW, warning coming on in the morning when its cold for the rear tps battery low. It also goes off after a short while but it is still annoying when you can't see anything on the screen.
Mentioned it to the dealer at 4k service but nothing done. For the 8k service I decided to replace the stock tyre with some PR3s and asked Mr K to replace the sensor under warranty whilst the tyre was off. The rear tps was replaced but the very next day the same warning came on. :sad: Mind you the difference the tyres made was fantastic. It was like a new bike - so much better. :yes:
The dealer called Mr K who said that maybe the tps had been on the shelf for a while so dispatched a brand new one.
Two days later, having just scrubbed the tyres in I got a low pressure warning to find a screw neatly embedded in my lovely new, unused tyre. :cry: It is the first time I have ever got a puncture and am slightly concerned that this might be the trade off with the stickier PR3s. Maybe I was just unlucky.
New rear tyre ordered which would be changed with a new tps. Went back to the dealer who had the wrong tyre delivered so decided to repair the puncture and wait for the proper tyre. Guess what? The NEW tps also came back with the same warning!! By which time I'm getting a little annoyed. Their replacement bikes were no where near the GTR!!
Mr K then said that maybe it's not a problem with the tps but with the sensor/ecu thingy so the dealer swapped the tps putting the 'dodgy' one in the front when the proper tyre arrived.
Sure enough the warning again comes on but this time for the front!! So maybe it is a dodgy brand new tps. I am now waiting to hear what they will do. On the bright side though at least I have not had to pay for the fitting of the tyre!!
Bloody hell Andrew, have you been kicking old ladies
It does seem like the tyre pressure sensors dont like cold weather, ignore em they will be fine when the sun comes out. :banana: :popcorn: