19-10-2014, 06:38 AM
150bhp is the realistic limit for low-cost tuning on both engines, unless you're a boss at doing stuff for cheaps. Anything more than that and you start to get issues with torque-holding, pressurising coolant, back-pressure, etc.
The economy doesn't suffer, if anything it'll improve when you're not using the power. Typically people will see a 5-10% increase in economy with a stage 1 map/pump tune if it's done well and they don't change their driving style. Reliability doesn't suffer either if done properly, there's a few simple precautions to avoid popping stuff, but beyond that they're still more reliable than most things.
The economy doesn't suffer, if anything it'll improve when you're not using the power. Typically people will see a 5-10% increase in economy with a stage 1 map/pump tune if it's done well and they don't change their driving style. Reliability doesn't suffer either if done properly, there's a few simple precautions to avoid popping stuff, but beyond that they're still more reliable than most things.