Ok peeps, I'm no mechanic, so I need some general pointers. My Astra GSi starts first time every time, drives perfectly well, returns decent fuel economy, has no misfires or flatspots, but just simply doesn't accellerate like it should - i.e. your average 1.6 Golf/Focus seems easily able to keep up on a sprint from the lights!
The previous owner had it rolling road tested, and it was dyno'd at 130bhp at the crank - 20bhp less than it should be. That was with a de-cat pipe, and a ram-air induction kit fitted also.
Since then (due to my number of speeding fines and my need to keep my insurance down) I've re-fit the cat, and the original air box, and yet the performance does not appear to have suffered. So it seems that the engine is performing within itself, seeing as these things should have detrimentally affected the power output.
So far I have just tried feeding it injector cleaner, optimax, super plus unleaded, and also it has had a full service with new air filter and spk plugs, which don't seem to have made any difference. So I am wondering, is there any common things to look for - i.e. any valves or owt get clogged up easily which might affect performance? The car has done 140,000 miles if that's any help.
Can anyone recommend a performance vaux speciallist in or around Hampshire who could have a good look at it and come up with a quick diagnosis?
Any help would be appreciated. Whilst I don't wanna lose me license, I would like to put that 1.4 Fiesta to the slaughter next time I'm having a bit of fun at the lights!