Power gain calculator:

Play with your Tuning the Vauxhall Astra options below and see which mods give you the best power gain.


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if you want to calculate your 1/4 mile times from the bhp.

Tuning the Vauxhall Astra

When tuning your Astra it is important that you get it right so follow our Astra tuning overview and see which the best modifications are.

Available in standard form with power of upto 237bhp (depending on the year), so this goes to show the tuning potential of the Astra. From this you can increase the power from anywhere between 260.7bhp to 402.9bhp but this depends on how deep your pockets are and how much fairy dust you want to use! You will almost certainly need to look at turbo or supercharger mods to get near that maximum power figure and your engines internals would need to be a fair bit stronger!

The Car Tuning Guide suggest that if you have a lower powered version you should do an engine swap with a ‘237bhp Astra Sport Hatchs’. Looking at what Vauxhall have done with their top of the range Astras you get an idea for the tuning potential open to you. Top of your list for tuning mods will be a sports exhaust system, a fuel boost valve (for a snappy throttle response) and a good quality induction kit.

The modification that gives the biggest power gain on your car would be a fast road cam. Internal engine modifications that should be high up on your list would be polishing and porting the head.

The Astras come in various power levels right up to 237bhp as per the Astra Sport Hatch If you apply a few tuning mods to this model of Astra you will see power gains from anywhere between 260.7bhp to 402.9bhp. But this sort of power requires some pretty heavy investment and a hell of a lot of engine work. .

Vauxhall put together a nice package but the turbo Astra owners have a real tuners dream. A remap and Intercooler will add a lot of power to the engine and in some cases you can double your power. The most powerful Astra has a healthy 237 bhp. In a competition setting you may well, with some forced induction, reboring and other major work see power figures between 308.1 bhp to 450.3bhp with mods we have outlined above.) High on your list of mods for your Astra should be handling improvements. You shouldn’t really lower a car by more than 30-35mm.

Check back frequently for updates as we will be adding more detailed tuning guides to this site.

Here are some motoring links who provide some excellent resources on all aspects of car tuning and modifications:
Car Tuning Great guide on just about every car modification around.

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