jtd engine efficiency

[krisrt]

do the cats cause the engine to come up to temp quicker thus naking it more economical sooner?
iv been looking into removing my cats to gain more horses but i need my engine to come up to temp as soon as it possibly can as i dont live very far from work so want my engine to become economical as soon as possible.

cheers kris

[Kev Bassett]

Removing the cat will make the exhaust free flowing and will have a slight improvement on performance.

[krisrt]

Originally Posted by Kev Bassett

Removing the cat will make the exhaust free flowing and will have a slight improvement on performance.

This part I know what I'm wondering will it cause the engine to take longer to get upto temp?

[sussexa]

I would take a guess at yes, takes longer to warm up. Is it measurable?.
I have mostly short journeys also and some times I'm half way there before reaching
Mid point on gauge , egr disable would also make longer to warm up and also front mount intercooler.
I have all these and most significant thing on how fast it warms up is type/speed of driving, if I go downhill coasting 30mph takes a long while to warm up, if I go other direction I soon hve uphill section and into 50mph roads and car warms up very quickly as on boost from getgo.