Dum-Dums Bianca GTi6

[Dum-Dum]

Surely it's a tiny bit more complicated than that? If the stock ECU can barely cope with changing the manifold how on earth is it going to deal with this? Or have I missed something?

The stock ecu can cope fine with changing manifolds its just that these bodies will flow twice the air at the same velocity as the standard one and thats alot.

The ECU wont notice the increase in fuel pressure as it will only be slight and the ECU dosent actually measure the pressure at any point so itll just keep assuming its putting in 3.5bar when actually itll be putting in nearer 4 bar. The lambda will adjust the mix a little bit. Heres a brief explanation off t' internet

An average ECU using a narrowband sensor will generally only use the lambda sensor's output during two specific conditions:- (a) during idle, ie. when the engine is under no load apart from keeping itself running, and (b) during part-load conditions (which we usually term 'cruising speed') where the engine is keeping the car at a constant speed. These two conditions account for the majority of the car's operating time.

A car equipped with a wideband sensor is able to usefully use the lambda signal over a wider range of operating conditions but it is still mostly utilised around stoichiometry or during lean-burn operation.

The ECU will generally ignore the lambda sensor's output during three further conditions:- © when the car is accelerating - the ECU will spent much of its time deliberately enriching the mixture to avoid hesitation and to provide extra power, and (d) when decelerating or 'engine braking' (which we usually term 'on the over-run'), when most ECU's will shut off the fuel completely to aid economy.

Finally condition (e) is a special case - that of cold starting, where the ECU deliberately runs the engine rich all the time to promote quick starting and ease cold-running. Once everything is up to temperature, normal operation will resume. Depending on manufacturer, a special type of Lambda sensor may be specified that has an extra quick heat-up time which means as soon as rich running is not needed anymore, the lambda is ready for operation.

Bet she's loud now!

That exhaust looks mint, almost OEM...! Pricey??

Not driven it yet, im hoping not terrible as my old mid box was ruined, Id blown several large cracks in the old mid box and this is why it sounded like it was blowing. Also the new single box is the same size as the old mid and back box put together.

I really like the look. It was £60 2nd hand off Scott.