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Nairaland Forum / Nairaland / General / Car Talk / Tyre Pressures: Save Yourself! (2237 Views)
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Tyre Pressures: Save Yourself! by Piyke: 7:33pm On Aug 03, 2020 |
A friend complained of issues with the TPMS (Tyre Pressure Monitoring System) on his Mercedes and I wanted to help. What I found was shocking.... |
Re: Tyre Pressures: Save Yourself! by Piyke: 7:42pm On Aug 03, 2020 |
The vehicle is a 2008 C class and he had just taken on a 12hr trip (6hrs each way). I hooked up my scanner, entered the TPMS service menu and pulled the sensor ID's from the TPMS ECU. The only abnormal thing at this point was a missing ID for the left rear tyre sensor. |
Re: Tyre Pressures: Save Yourself! by Piyke: 7:44pm On Aug 03, 2020 |
Next, I activated the tyre sensors and got the readings below. The correct pressures for this car are: Front - 30psi Rear - 35psi 1 Like
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Re: Tyre Pressures: Save Yourself! by GAZZUZZ(m): 7:48pm On Aug 03, 2020 |
Piyke: your friend is suicidal , I like your scan tool 1 Like |
Re: Tyre Pressures: Save Yourself! by Piyke: 7:48pm On Aug 03, 2020 |
Imagine having almost 56psi in a tyre that should have 35psi. I can't imagine the number of accidents that are caused by incorrect tyre pressures in this country. Do you know your tyre pressures? |
Re: Tyre Pressures: Save Yourself! by kingreign(m): 8:25pm On Aug 03, 2020 |
Piyke:Over time, when you drive, due to heat and colliding forces of the air molecules, the air pressure in the tyres increase. When you've parked and cooled sufficiently, the real cold PSI shows, usually in morning time. 3 Likes |
Re: Tyre Pressures: Save Yourself! by Nobody: 8:40pm On Aug 03, 2020 |
kingreign:But the temp reading looks normal. 1 Like |
Re: Tyre Pressures: Save Yourself! by Piyke: 8:47pm On Aug 03, 2020 |
GAZZUZZ: Thanks boss. Glad to have eliminated this safety issue for my friend. |
Re: Tyre Pressures: Save Yourself! by Piyke: 8:53pm On Aug 03, 2020 |
veeshock: Good catch on the temperature. The car was not driven today and Abuja has been having cool temperate weather of recent. |
Re: Tyre Pressures: Save Yourself! by thonyman: 9:42pm On Aug 03, 2020 |
Oga Pyke, Pls I need to reach you on the phone, please give me your contact. |
Re: Tyre Pressures: Save Yourself! by Piyke: 9:52pm On Aug 03, 2020 |
thonyman: PM replied |
Re: Tyre Pressures: Save Yourself! by Presegs(m): 10:10pm On Aug 03, 2020 |
Piyke: Nice one. This is my kind of scanner made by Autel! !! |
Re: Tyre Pressures: Save Yourself! by timifakay(m): 12:05am On Aug 04, 2020 |
Presegs: Calm down But do you know how to use it? When you use it, do you know how to interpret the results? Abeg, Nobody should quote me, I'm not around 11 Likes
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Re: Tyre Pressures: Save Yourself! by dgitrader(m): 4:12am On Aug 04, 2020 |
Piyke: Vulcanizers Ooooh. I once asked a roadside vocah what PSI my tyre needed, he said '50' like a boss, I was wowed! Asked why, he smiled and pointed to a spot in the tyre where it was written ''51psi max''. I simply told him to use 40psi and ran for my dear life. @gazzuzz If 35psi is recommended as in most cases, why does the tire look a bit visually deflated where strictly applied? Especially with not too new tires? |
Re: Tyre Pressures: Save Yourself! by AutoElectNG: 5:41am On Aug 04, 2020 |
Piyke: A while ago, I recall making a post that whenever I travel, I make a pit stop every 100 or 200 miles and do a tire pressure gauge, I either increase or deflate depending on the results, since instituting this program I have never suffered a blowout. This is especially important if you intend to run the vehicle at sustained high speeds. 1 Like
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Re: Tyre Pressures: Save Yourself! by Gazzuzzlogistic(m): 6:36am On Aug 04, 2020 |
dgitrader: as a child do you remember taking your ball to get it pumped ? When there's too much air it feels like a rock. There's a reason tyres are made out of rubber, 30-35psi works in most cases not for every vehicle though. 1 Like |
Re: Tyre Pressures: Save Yourself! by Gazzuzzlogistic(m): 6:38am On Aug 04, 2020 |
timifakay: Honourable member off your mic, pls off your mic, is ok is ok . 7 Likes
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Re: Tyre Pressures: Save Yourself! by Piyke: 8:33am On Aug 04, 2020 |
dgitrader: This seeming deflation is very important to maintain the ideal 'contact patch' of the tyre with the road. Overinflation reduces the size of the patch and lengthens the distance over which braking occurs. It also affects handling and traction. 3 Likes |
Re: Tyre Pressures: Save Yourself! by dgitrader(m): 9:00am On Aug 04, 2020 |
Most times I see cars with new tyres looking like the highlighted, I feel for the owners. But when u use the correct psi, yours appears underinflated, that's why I always use +5, And regularly check the pressure bi-weekly to make sure it doesn't decline below 35psi.
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Re: Tyre Pressures: Save Yourself! by Presegs(m): 10:29am On Aug 04, 2020 |
timifakay: Google.com will answer your dumb questions/assumptions dear OBD II 8,500 naira worth scanner owner! !! 2 Likes |
Re: Tyre Pressures: Save Yourself! by 9icetoo(m): 12:55pm On Aug 04, 2020 |
kingreign:That's shouldn't be the reason for a 56 psi reading. After a ten hour journey, my psi changed by only 4 units. I started off with 35 psi, I got to my destination and my tpms showed my tires were all 3 to 4 psi higher than when I started my journey. |
Re: Tyre Pressures: Save Yourself! by 9icetoo(m): 1:01pm On Aug 04, 2020 |
dgitrader: That's how they are supposed to look. We got used to seeing over inflated tyres and subconsciously assume that's how tyres should look. +3 to +5 psi isn't bad. What manufacturers give are just recommendations in an unloaded car. Pressures when loaded are sometimes also stated. Now for our uneven roads, adding 3 to 5 psi should give your side walls some added rigidity and prevent undue damage from bumps. However, never exceed the maximum recommended stated cold pressure from the tyre manufacturer. 2 Likes |
Re: Tyre Pressures: Save Yourself! by timifakay(m): 5:37pm On Aug 04, 2020 |
Presegs: Sorry sir 1 Like
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Re: Tyre Pressures: Save Yourself! by Presegs(m): 6:28pm On Aug 04, 2020 |
timifakay: E kpele buroda oponu! !! |
Re: Tyre Pressures: Save Yourself! by adanny01(m): 10:23pm On Aug 04, 2020 |
9icetoo: To add to this, most of our vulcanizers carry a pressure gauge that is uncalibrated, faulty or they simply don't know how to properly read the gauge. Most pen tire pressure gauge has 2 sides of readings one side is either Psi or lb/in² which are both same and the other side is in kg/cm². 30Psi=30lb/in²q=2.1kg/cm² So imaging this, how many volcanizers know which is correct? If you tell a volcanizer to pump your tire to 40, how will you know if he pumped 40Psi or 4.0kg/cm². If he did 40Psi you are safe. If he did 4.0kg/cm²=57Psi If he did 3.0kg/cm²=43Psi Besides, these readings are so small and require good training to avoid reading in error, especially parallax error (O'level physics/chemistry). Who has seen the coincidence with what Piyke has seen? Some vulcanizers are actually using the wrong side of their gauge. Also, no vulcanizer will pump less than 40Psi if you didn't limit him to 35Psi. What they go with is the maximum tire pressure written on the tire against the car specific tire pressure. I have tried to enlighten a good number of them but they all stick to their wrong training. 4 Likes |
Re: Tyre Pressures: Save Yourself! by 9icetoo(m): 10:37pm On Aug 04, 2020 |
adanny01:And they will tell you they have been doing this for donkey years. |
Re: Tyre Pressures: Save Yourself! by AutoElectNG: 9:33am On Aug 05, 2020 |
There is a scientific relationship between tire pressure and speed and tire pressure and load carrying capacity. The tire pressure recommended by the manufacturer is for normal cruising speeds, if you max out the speedo, the recommended tire pressure is no longer adequate. There is a formula for it: +6miles/h =Increase your pressure by 1.5psi but never exceed the maximum pressure rating on the tire sidewall The tire pressure recommended by the manufacturer does not account for overloading and maxing out the speedo at the same time There is a formula for it: +6miles/h = -5% load capacity So let's be properly guided 4 Likes |
Re: Tyre Pressures: Save Yourself! by Nobody: 1:26pm On Aug 05, 2020 |
AutoElectNG: True. I'll add that manufacturers also recommend tire pressures for high speed driving.
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Re: Tyre Pressures: Save Yourself! by Drcentrist: 6:46am On Aug 12, 2020 |
Piyke what do you pump a Toyota corolla written 30psi as recommended but tyre can take 44psi,I normally pump to 35psi,what's your suggestion? Piyke: |
Re: Tyre Pressures: Save Yourself! by Piyke: 6:54pm On Aug 12, 2020 |
Drcentrist: Go with what is written on the door jam area (30psi). What is written on the tyre is the maximum cold pressure which should not be exceeded. Take it as the design limit of the tyre. |
Re: Tyre Pressures: Save Yourself! by alphaNomega: 4:02pm On Sep 08, 2020 |
Piyke: Interesting |
Re: Tyre Pressures: Save Yourself! by alphaNomega: 4:03pm On Sep 08, 2020 |
dgitrader:40 psi is my magic number all round 1 Like |
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