Sprint TOR Map, no CAT and SAI fitted.

I want to know why you have to change the map just for an exhaust upgrade. Never have to do it for cars so why bikes?

Could you tell me how much different the bike sounds with the off road system? Is it much louder? I'm interested myself but was thinking of fabricating my own system up with an old car sports backbox

Ryan

 

Hello XTB, you are certainly not the first person wanting to change their exhaust without removing the SAI system.

On a general point if you haven't changed anything on the inlet side of the engine i.e. removal/modification of the airbox; foam free-flow air filter; then the need to remap is not really very strong for a TOR exhaust. This exhaust is only slightly more free-flowing than the original one so will have little effect on the engine.

Have you still got your O² sensor in place? It'll be installed on the exhaust downpipe.

 

Hi Ryan, so you would like to know why re-mapping is sometimes necessary on a bike? It's all about the configuration of the engine matching to the fuelling parameters of the map in the ECU. If changes are made to inlet and exhaust sides, then the engines configuration no longer matches the fuelling parameters so the engine will not run to it's optimum.

This also applies to all fuel-injected engines it's just that with bike engines the changes have a more direct impact.

Any changes that allow an engine to 'breath' better, will affect the fuelling, but with 3-way cat systems (as used in most modern cars) they have a more sophisticated sensor array (before and after cat sensors) so they can cope better with changes.