New Set up and Hotter Temps?

[m3seb]

Just swapped my M3 over from completely stock to a secondary cat and resonator delete with no muffler and I noticed that the temps seem to run 10-15 degrees hotter than they did when it was stock. Used to run at ~195-200 cruising around but now its ~210. Is this normal and does anyone know why this is? Thanks!

[AYSchweiz]

Not sure why you might see a change, but mine ran 210 F both with and without cats. Reading other forum posts it looks like 210 F is pretty standard. I'm also in the bay area BTW so climate difference shouldn't be a contributing factor.

[m3seb]

Yeah don't think its climate based. My theory is that because there is reduced back pressure the engine is scavenging less efficiently and that is making it run a little bit hotter. Just a though

[RocketyMan]

Back-pressure is never desired in any ICE.

What is desired is exhaust scavenging and anti-reversion.

Having oil temps at 210F is perfect. Oil temps need to ideally be hot enough to boil water and cool enough to maintain viscosity. If there is question on excess oil temps, you can verify if your oil cooler t-stat is functioning by physically touching the oil cooler and determining if hot oil is flowing thru it via being hot to the touch.