GAIN MORE POWER ASTRA J 2.0 CDTI ECOFLEX ELITE 165BHP

[tatters40]

Granted it will suck air in a little easier but the effect will be more of an increase in engine response as opposed to actually making more power.

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Why wouldn't I gain anything with a panel filter?
Also can you change the red colour dash bulbs to different colour?? If so where would I get them from.
Thanks

Hi Marcus



I could go into a huge amount of detail but i won't at this stage.

The volumetric efficiency (and power increase) can easily be adjusted within a petrol engine as the explosion is a direct side effect of the fuel/Air ratio, heat generated by compression is ignited by a spark. The more Air and Fuel (generally) that can be ignited the bigger the `bang`

A diesel engine is heated by compression of the air introduced early within the combustion chamber, the air becomes extremely hot due to continual compression, when diesel is introduced in a fine mist (under extreme pressure) it immediately ignites so no spark is required.

A panel air filter will likely just increase clatter

Nice write up.


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I used to have Astra F 1.6 which was a little sluggish after having had a Astra E 1.8 before that.

In my quest for more power I had a powerflow exhaust made up for the car. Curious to see what sort of power it was actually making I took it to a local tuner for a dyno run. The results were OK but still no more than a 5% improvement.

I then asked the tuner about K&n filters and if they improve power to which he replied hardly ever.  To demonstrate this he whipped out the air filter element completely and put the car back on the dyno.

The 2nd dyno run showed absolutely no increase in power but did show an extra 3lbft torque at a particular rev range. (Not peak)



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Standard petrol cars run very lean through the mid range, so much so that slight flat spots are created. This is purely to win the emission wars between manufacturers. When you `chip` or `map` a low powered car such as a 1.6ltr Astra or similar all the map does is take the fuelling back to where it should have been in the 1st place.

Fitting an air filter to such a car will not even help throttle response as sucking extra air in does nothing unless the correct amount of fuel is added, standard 1.6ltr cars will have a very slight amount of free play in the ECU/Injection system to richen the mixture slightly liberating approximately 2bhp on a standard 120BHP engine, this is the only time a panel filter and decent exhaust will help which may liberate a further 3-4 BHP, adding a panel filter in isolation will only increase intake noise. 

A turbo petrol engine is a different beast altogether as more air is forced into the engine allowing more fuel to be added, a decent panel filter and exhaust then makes a larger difference