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Drilling and slotting brake disks was done originally to improve the "bite" of the brakes. Any dust or crap under the pad would prevent all its area pressing against the disk, and so did the gas the comes out of the pad as it heats up. The gas and the dust and whatever else would quickly get...

Your gearbox has an input shaft and and output shaft connected together by a number of pairs of gears, one pair of which is meshed together at any one time depending on which gear you've selected. When you push the clutch pedal in the input shaft is disconnected from the engine, but the ouput...

Real race cars need dry sumps. Some cars need something if you're going out on the track in them. A lot of the V8s need them because at 1G side loading, which you can get on a good tyre, the oil ends up in the left or right bank cylinder head instead of the sump. But the solution is usually...

Been there. Done that. Ended up with a badly bent wheel nut wrench and a twisted ankle.

Most of the benefit from inflating with nitrogen is not from inflating with nitrogen but because bottled nitogen has no moisture in it. Dry air would provide most the benefit. The benefits that do occur either only occur in any measurably quantity in a highly loaded tyres, which isn't the case...

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I have mentioned before that I did some testing for an unrelated purpose, and I was surprised how long it took before other evidence showed the ECU had decided the car was warmed up. It was long after the water temperature guage showed normal.

The facts that something is true at some point in time doesn't continue to make it true. Yes it is a fact that early ABS-equipped cars had a worse crash record that the same models not fitted with ABS. But the technology has changed. Those early cars had single- or at best dual-channel...

The interesting things is not that they've done it. they're not the first. Its that they claim that it only uses a third as much power as an air conditioner. That's what's stopped the adoption of hydraulic active suspensions. That the amount of power it took to run them sapped the performance of...

I note that the cover on the steering wheel air bag in the Clio is labelled "SRP" on it, which indicates its only a "supplementary" system, and it may well have a minimum speed at which it can activate.

There is a concept in crash engineering called "aggressiveness". Because the severity of crashes goes up with the square of the speed they occur at crash structures and devices have to be designed for a speed at which they work best. If you design a crush structure to be stiff enough to collapse...

I just did a search for "HID" on www/ebay.co.uk Nearly all adverts offering "HID" globes were fraudulent. They are not HID globes, they are tungsten filament globes that use zenon as the halogen gas in the bulb. Some were fraudulently labelled on the packaging as HID. You can be sure any...

Wind deflector.

There are two possible results from changing the induction system. More power. And more noise. All we've seen so far from you is products that promise lots of the former but instead deliver only lots of the latter. How about products that do it the other way around?

Putting a racing grind camshaft in a road car. Not the Clio Sport ... a Honda Civic I had back when I was young and stupid. It was my day to day road car, but I also took it out on the track for a bit of fun every so often. It turned it into a dog on the road. Some is good, more isn't...

Whether there's some cams that the standard ECU can't be remapped to handle, its irrelevant. These guys on Australia have a problem. They know there's easy extra power available from a remap, but there's no-one they know of in Australia who can do a remap of the standard ECU. So they're faced...

Have you tried the Oz Renault forum to see if anyone knows of a suitable product there? http://www.ozrenaultsport.com/forum/ Replacing the car's standard ECU with a competition ECU would be one hell of a rewiring job, and it isn't going to be the cost effective way of getting a remap...

I'm not surprised it blew up. Nitrous is an oxidiser. Its more oxygen. You also need more fuel.

If you lower it significantly it shouldn't make the handling worse, well, not unless you lower it right down to the point where its sitting on the bump stops not letting the springs work. But any significantly lowered car isn't going to give you as strong a messages that its close to the limit...

I don't like Clarkson and I don't like Top Gear because its full of Paganis and Ferraris and Aston Martins, not real tests of real cars that real people buy. But I have to admit the core point in the review is a valid and good one. "fitting a 2 litre hatchback with all this pseudo-F1 stuff is...

Looks a bit odd that power keeps increasing right up to 7500+ rpm then disappears suddenly. Its the geometry of the intake and exhaust manifolds and the cam timing that determine the revs that maximum power is developed at, and you haven't changed any of those things, but somehow the maximum...

They don't say what what tyre, just the size! You could end up with any crap. And probably would because that's how they'd keep the price down. But then if its only appearance that matters to you, what's it matter.

Why, do you want to keep the fuel rail cover and swap engines?

No. The standard one isn't so small that its the problem. Not until you're looking for big horsepower.

Your wheels aren't 195, that's your tyre size. Your wheels are 7" wide. You can safely and legally fit 195, 205 or 215 tyres to 7" wide wheels. But wider than standard tyres stick out further each side of the rim and may rub when you turn the wheels to full lock. Since the later models came with...

Turbo engine fits. But the Clio's standard gearbox is made of chocolate and won't take the extra torque. And the turbo's gearbox is longer and doesn't fit, well, not without a lot of difficulty. As the previous poster said, if it was easy everyone would be doing it.

F1 cars are required by the rules to run 13" diameter wheels. Teams and tyre manufacturers are not allowed to fit anything else. It is one of a number of rules that now look silly and outdated that restrict the performance of F1 cars that the teams and in this case the tyre manufacturers are...

The companies concerned say they get large numbers of complaints from customers who haven't read the instructions on the container and just poured it in straight, or did that in the mistaken belief that if 60% is good then 100% is better. You'd think they'd just sell it in the right concentration.

To be honest we don't give a damn what you've got on your car.

Yeah, my father used to say that. That a heavy car sticks to the ground better than a light one. That must be why they make formula one cars as heavy as they're allowed to, so they corner better, right? And what you should do to make your Clio handle best is add ballast at both ends. None of...