Car Not Start on Rainy Days

If I drove VW Polo everyday, it would start perfect and run perfect for months. But if I let the car sit for more than 24 hours, on the next day it would have lots of trouble to start the engine.

I’d have to wait for the sun to warm it a little and then It would turn on as if nothing was ever wrong with it.

The Cause:

It turns out that the rotor in the distributor had a huge hole in it.

So my dad cut a tiny piece of wire and put it inside the hole linking the 2 extremities of the hole. I think the inner stuff is graphite. He put it back in the car. And lo! It started despite the heavy rain! 😀

The Solution

But we decided to buy a new rotor in a car shop nearby for Rs 300. My car’s been great since. Noticed some performance improvement.

Take car of your car. Drive safe.

Changes to Road Traffic Act Mauritius

According to L’express, today the Ministers were supposed to discuss about changes to Road Traffic Act: Amendements à la Road Traffic Act: ce que risquent les chauffards

The article states:

“Conduite dangereuse entraînant la mort

Un individu qui a causé la mort d’une personne en se rendant coupable de conduite dangereuse sera passible, après condamnation, d’une amende variant entre Rs 25 000 et Rs 50 000 et d’une peine d’emprisonnement ne dépassant pas cinq ans.Actuellement, l’emprisonnement maximal est de trois ans pour ce délit…

Conduite imprudente en état d’ivresse

Un conducteur reconnu coupable d’avoir causé la mort d’une autre personne alors qu’il était en état d’ivresse sera passible d’une peine d’emprisonnement de cinq ans au maximum, au lieu de trois ans.”

Dunno actual the benefits caused by keeping someone in jail for 2 more years on the expense of Mauritian tax payers.

“En cas d’accident

Jusqu’à présent, le conducteur impliqué dans un accident a quatre heures pour le rapporter à la police. Ce délai sera ramené à une heure.”

Hmm. Purpose?

Le rôle d’un magistrat

Un magistrat aura désormais la possibilité de suspendre le permis d’un conducteur arrêté avec un taux d’alcool au-dessus de la limite autorisée, à la demande de la police et avant même qu’il ait été reconnu coupable en cour.

What? Can’t understand anything. What’s the difference between “reconnu coupable” and having higher alcohol level in blood? Either you broke the law or you did not. WTF?

Anyways, forget the Ministers and their shows. What do YOU think will really reduce accident on Mauritian roads?

My thoughts:

• Replace roundabouts by flyovers. Might cost a lot but much less than what the ministers spend abroad in 1 year alone.
• Remove humps on the roads to reduce stress fir drivers.
• Add more speed cameras but increase the speed limit so as to still make it drivable. Some places the speed limit is at 60km/h for no reason despite the car naturally wants to go at 80km/h.

Let Mauritian people afford new Tyres for less accidents!

Foreach Rs 2000 I earn over 21,923, Rs 300 will be deducted under the PAYE system [1]. The remaining Rs 1750,  Net Payment, which will be credited into my bank account. Should I decide to purchase let’s say 1 tyre for my car at Rs 1200 + VAT/Tax. I need to pay Rs 1380 (Rs 180 as VAT/Tax). But wait! Is that it?

Let’s see what the the MRA website says about Tyres [2].

What do I see there? There was already a 30% duty/custom charges on it. Meaning about Rs 277 was already Taxed upon it by Government.

In order to change 4 tyres on my car, I need to work for a whopping Rs 6494. PAYE will cut Rs 975 on my salary slip. I will pay 15% VAT for 4 tyres totaling Rs 720. 30% Duty/Custom Charges totaling Rs 1107. In reality, It would have costed only Rs 3692.

Do you find it OK to have to work for Rs 6494 to buy things which are priced at Rs 3692. And that thing happens to be primordial for road safety?

And it’s not over. I need to pay Rs 3500 yearly as Road Tax. Meaning I need to earn Rs 4117 (15% PAYE). Rs 1200 fitness for twice a year, need to work for Rs 1412. Not counting yearly insurance, levy on fuel and so on.

Hey Mr the Government. Instead of putting bullshit policies around, let the common people use their hard earned money to maintain their cars properly instead of paying you to use shitty roads. Buying new tyres is NOT a crime but rather should be encouraged for safer roads.

BTW, there is a petition to remove Custom Charges on new cars which have engines less than 1600 cc. Please sign here: https://www.change.org/p/mvda-pour-la-suppression-de-l-excise-duty-pour-les-v%C3%A9hicules-de-moins-de-1600cc

NOTE: I am not a financial expert. I am just a citizen of Mauritius browsing the internet.

[1] www.mra.mu/index.php/employers/paye

[2] http://www.mra.mu/index.php/importexport-a-others/travellers/88-customs-charges

Review: Firemax FM316 Tyres at Tiremaster LTD

Got my VW Polo (Mk3/6n) some new Tyres recently at Tiremaster LTD located at Curepipe. Very nice and professional service I must say.

Bought a set of 2 Tires of the size 155/70R13 for Rs 1668, i.e. Rs 834 each, including mounting and balancing. I’m not sure it was Nitrogen filled as per what the ad said. I simply forgot about it.

The advertisement also said “European Quality Tyres” but actually they are from China of the brand ‘Firemax’. I guess it’s only about the ‘standards’.

I love the new Tyres. The steering wheel feels much much lighter. I don’t have to stress that much so as to be able to park or do some quick maneuvers. I guess 155/70R13 tyres have smaller contact width that 155/80R13 ones. I remind you this car doesn’t has power steering. Now it feels like as if it did have PS 😛

I don’t feel any vibrations when going above 100km/h on the motorway. Driving on bumpy roads feels a bit more firm but it is still a very comfortable ride.

Are the tyres durable? Only time can tell. Rumour says typical tyres last about 2 years. We’ll see how they perform with time as they wear out.

Changing a Car Tyre

Dad noticed my car front tyres were different in size. Maybe one was flat or whatever? No, they were indeed of different size. Here’s there specs:

Front left  : 155/80 R13

Front right: 155/70 R13

As you can see the aspect ratio of the tyres are different. Here’s a diagram below explaining the tyre and wheels terminologies:

Let’s calculate the circumference of the 2 tyres

$$\text{tyre width}_{t1} = \frac{155mm}{1000} = 0.155m$$

$$\text{rim diameter}_{t1} = 13\text{inch} \times 0.0254 = 0.3302 m$$

$$\text{rim radius}_{t1} = \frac{0.3302m}{2} = 0.1651m$$

$$\text{tyre height}_{t1} = \text{tyre width} \times \text{aspect ratio} = 0.155m \times 80\% = 0.124m$$

$$\text{tire radius}_{t1} = \text{rim radius} + \text{tyre height} = 0.1651m + 0.124m = 0.2891$$

$$\text{tyre circumference} _{t1}= 2 \times \pi \times \text{tyre radius} = 2 \times \pi \times 0.2891 = 1.816m$$

Lemme try to write a function for getting the tyre diameter with variables w as tyre width, a as aspect ratio and r as rim diameter.

$$f(w,a,r) = 2 \times \pi \times (\frac{r \times 0.0254}{2} + \frac{w \times 80}{1000 \times 100})$$

Let’s calculate the diameter of the second tyre:

$$\text{tyre circumference}_{t2} = f(155,70,13) = 1.719m$$

The difference in diameter is about $$0.097m \text{ or } 9.7cm$$

Does it matter if the 2 tyres are of different sizes?

Most cars in Mauritius are front-wheel-drive (FWD) cars. My VW Polo MK3 is too. Distinction is made between Front-wheel-drive rear-wheel-drive (RWD) cars by which wheels are connected to the engine; the drivetrain to be more precise.

In RWD cars:
– The front tyres handle the steering part.
– The rear tyres are responsible to acceleration the vehicle.
– Braking is divided among front and rear tyres.

In FWD cars, all the roles are performed by the front-tyres only except for braking which both rear and front do. I am not going to discuss FWD vs RWD in this blog post.

Ok, I was situation that my 2 powered tyres happened to be of different size. The 2 wheels are designed in such a way that they do not spin in strict synchrony with each other. The reason is simple, imagine you are going through a corner, your inner tyres will need to cover less distance than the outer tyre. Remember our circumference equation above? If the wheels were made to rotate at the same speed, the inner wheel would slip causing loss of stability. Car’s are fitted with a differential to allow wheels to spin at different speeds while be able to power them. The disadvantage of this is that most power goes to the wheel with the least friction. If one of your drive tyre is in the air, the other drive tyre will remain still and the tyre in air will spin leaving you puzzled why the car is not moving. To solve this problem, engineers invented the limited slip differential. Think I’m going into too much details. Back to topic:

If the 2 FWD tyres are different, it shall not cause tyres to slip due to presence of an Open Differential. But the smaller tyre would be the one accelerating your car since it requires less torque to get spinning. Thus, only 1 wheel is responsible for power delivery on a total of 4 wheels. That’s kinda unfair. It is also going to have much more wear than the others. This can cause the car to tend to either left or right as i was experiencing.

Do make sure that the 2 tyres connected to the drivetrain are of the same size!

To upscale or downscale?
Ok, we got a bigger tyre and a smaller tyre. Do we replace the bigger one with a new smaller one or vice versa?

First advice, have a look at your owners manual. It will have best tyre size depending on your engine size.

Putting a bigger tyre than stock might give your car better looks and top speed but you lose in terms of acceleration and also fuel economy (rumour says).

Maintaining a car needs lots of time, money and research. Take care of your car as much as you can 🙂