high water temp?

[JFP in PA]

Originally Posted by Jaxonalden

Jhandy,
If that were true don't you think the mechanical engineers at Porsche would know this and install a 160 thermostat at the factory? They don't because for the engine to be "efficient" it needs to run at the OEM spec temp. I think Porsche has a little more knowledge in this field (almost 80 years) than most.

Are you referring to the "Almost 80 years" of experience that also gave us slipped cylinders in the 2.5L M96, rear main seal failures across the entire M96 line and IMS bearing issues leading to catastrophic engine failures?

[jmatta]

And prior to that; broken/pulled cylinder head bolts, magnesium case warpage, premature valve guide wear, exploding dual mass flywheels, faulty chain tensioners, faulty dual plug distributors, failing secondary air injection systems...should I go on?

Thank goodness the aftermarket stepped to provide fixes for many of the "factory" blunders.

[Jake Raby]

Today Porsche Engineers are trumped by Porsche Accountants.
Those who feel the Porsche Engineers do no wrong are learning on a near daily basis that they are incorrect in their assumptions.. This isn't the same company or same people who created the Porsche marque.

Why they didn't do it from the factory is the same question that can pertain to why they did the things that lead to the 15 different modes of failure that we have discovered related to the M96 engine, some of which occur at as little as 18,000 miles leaving the Owner of the Porsche with a pile of rubble thats called a "Catastrophic engine failure".

The low temp TSTAT works and I have data that proves this, its been my job to test the product in my lab and in the field for LN Engineering. EVERY engine I build gets one as standard equipment.

Porsche created it, the aftermarket is perfecting it and most of us aren't Engineers, just innovators with common sense.

[Jaxonalden]

What I was referring to was the engine efficacy at temperature and the expansion of all the different metals. There's also the tuning that goes with that through the ECU.

Comparing that with deficient material and design flaws is apples to oranges comparison. Of course you can fool the ECU into thinking the engine is still cold and then have it compensate by dumping extra gas to try to get it up to temp.

Is this considered a poor mans remapping?

[cnavarro]

There is no 'fooling' the ecu. The difference in temperature is still within target of what is considered an engine that is completely up to temperature. There is a threshold for warm up enrichment that if the engine is not to temp it will throw a code. Also if short or long term fuel trims are outside their allowed range of correction, that too will throw a Porsche specific code.

I don't have Porsche specific figures (I'm sure there is some person somewhere who knows this), but it would appear that cold start enrichment on a modern engine usually stops by 160F. The engines continue to operate at their target AFR, be that stoichiometric or not. OBD2 code P0128 is thrown if coolant does not reach 167F after a prescribed warm-up period. Even in sub-zero ambient air temps, with the low temperature thermostat, coolant stabilizes at 172F.