How to tune your petrol car for more performance

Every enthusiast has thought about this at some point or the other. How to extract more performance out of a regular road-going car? CarToq takes you through common performance modifications you can do to your car.

When you decide to modify your car for more performance, be warned that many of these modifications can affect your warranty, so preferably don’t do some of these modifications with a new car. And also, please don’t do these: The most useless modifications for your car

Performance mods for your diesel car here

Once you’ve decided to increase performance from your car let’s take it step by step.

How to tune your petrol car for more performance

High-flow air filter

You can get high flow air-filters from K&N or Green Cotton. These come in two kinds. Stock replacement filters fit directly into the air filter slot in your car. These are oil-coated mesh filters that allow more air into your engine, allowing the car to “breathe” better. Other universal cold air intake kits are more expensive and need some plumbing. Stock replacement filters cost between Rs. 3000-Rs.7000, while universal filters will cost between Rs. 10,000 and Rs. 15,000.

Free-flow exhaust

With a car that breathes better, it needs to let the gases out equally fast. Modifying the exhaust to a free-flow exhaust allows for more gases to escape faster. A free flow exhaust needs to be fitted in entirety from the “headers” or exhaust manifold that comes out of the engine head, to the muffler and tail-pipe. Some will only add a muffler that makes more noise but gives not significant performance gains. The catalytic converter may have to be removed for full performance gains, but then your car won’t meet emission norms. This modification will cost between Rs. 10,000 and Rs. 30,000.

Engine oil

If you plan to increase performance of your car, it will likely see a lot of high-rpm driving. In which case it would be better to switch to a synthetic engine oil instead of a mineral oil. This will allow for better lubrication and longer engine life. Synthetic oil will cost you about Rs. 900-Rs. 1000 a litre. Also read: Synthetic oil vs Mineral oil

Tyres and wheels

One of the most important factors in extracting maximum performance from your car is to upgrade the tyres and wheels. Go in for low-rolling resistance tyres and light-weight alloy wheels. If possible you can widen the tyre size a little, but reduce the profile height accordingly. Also read: Guide to alloy wheels


Performance spark plugs

For constant high-rpm driving and better tolerance to heat build up, you will need to replace your spark plugs with performance plugs (iridium tipped plugs). These spark plugs will cost between Rs. 1000-Rs.4000 a set.

High-voltage plug wires

To ensure there is no loss of current it would help to upgrade the plug wires to a performance wiring set. This will ensure you get the best possible spark at all times, without misfiring. This will cost about Rs. 2,500-Rs.3000.

Suspension upgrade

The car’s suspension will need to be stiffened for performance driving. One of the easiest ways to do this is to install high-performance shock absorbers such as Bilstein or Koni kits that will add that extra stiffness to the suspension. These cost about Rs. 12,000-Rs.15,000 a piece.

Strut braces

To add more rigidity to a car’s body you will need to add strut braces. This is a bar that connects the two suspension struts across the top and prevents the car’s body from flexing (especially in monocoque designs), adding rigidity and giving better handling. This mod will cost about Rs. 5000-Rs.6000

Roll cage

Once you’ve got most of your performance upgrades done, it is a good idea to consider additional safety for your car. Installing a roll cage (like a rally car) will ensure that in the event of a crash you are more likely to step out unharmed. A roll-cage will cost about Rs. 50,000 and will require extensive body work (cutting and refitting of the body).

Performance brakes

Keeping safety in mind, another very important performance modification is the braking system. If you give your car 20% more power, you will need 20% more stopping power as well. You will need to upgrade the disc size and the brake pads and calipers. A brake upgrade can be expensive, with cost ranging from Rs. 8000-Rs.50,000.

Tuning chips

Diesel tuning boxes are now a common performance modification for diesel cars. There are tuning boxes available for petrol cars as well, which function in the same way. They “piggyback” with the car’s ECU and modify some engine parameters to fool the car’s ECU into injecting more fuel for a given rpm range. Tuning boxes cost between Rs. 20,000 to Rs. 35,000.

Clutch upgrade

If you plan to use your car for rallying, it would be a good idea to upgrade the clutch as well, as constant high-rpm driving will involve a lot of clutch wear. Upgrading the clutch, however, can affect day-to-day running of your car as it won’t be as smooth as you want it and will respond only to rough use. This will cost between Rs. 15,000 to Rs. 50,000 to upgrade.

Upgraded camshaft

The camshaft is what controls the opening and closing of the intake and exhaust valves in the car. Upgrading this to a performance (or high-lift) camshaft will allow the engine to breathe better and take in more fuel. However, day-to-day drivability will be affected. Camshaft kits from Piper etc, cost about Rs.30,000-Rs.45,000.

Polishing heads

Polishing the cylinder head will add a little more breathability to the engine as the ports for the intake and exhaust valves become bigger. This is not a task for the fainthearted, as it involves opening up the engine and refitting it. This will cost between Rs. 12,000-Rs.20,000 depending on the car.


Normal petrol cars can also be turbo-charged to make them even more powerful. Installing a turbo-charger would also mean changing the other parameters in the car. The cost of turbo-charging a car can vary between Rs.1 lakh to Rs. 2.5 lakh depending on the kind of turbocharger used.

The list of modifications that you can carry out to your car are endless. Eventually, it boils down to replacing your stock engine with a higher capacity engine and building on from there as well. However, if you are on a budget and want some modifications to increase performance, here are some ideas: Performance modifications for your car under Rs. 50,000

Share more modification ideas you have with the CarToq community.