When I drive pcar at high compartment temp( 93+ degrees ), I notice the response is worse.　I Can run pleasantly if temp is low even warm-up.
Does anyone know what DME5.2 does when compartment temp is high?
Though I think it retard ignition timing Corresponding to the water temperature, how many temp control begins?

Because I can control ignition timing or injector, etc by e-manage, I want to cope if reason is found out.

 

If your engine compartment temperture is 93C, you have some big problems with your cooling system. Also, your engine compartment fan should be running as well as your radiator fans when you reach temperatures of that level.

There is no reason to have an engine compartment temperture higher than about 15% higher than ambient temperatures. You should also be able to maintain coolant temperatures around 95C or less.

Things you should check:

Blockage of radiators.
Proper operation of radiator fans.
Proper operation of engine compartment fan.
Proper operation of coolant system flow.

 

Sorry, what I mentioned is maybe coolant temperture.
(I thought compartment and coolant temp is same)
The temperture was checked by diagnostics through AC controls, code "6c".

 

Then it appears you have no problem with engine temperature. 93C is well within Porsche's targeted temperature.

 

could it be the humidity? is the car in japan?

 

Thanks. If coolant temperature over 95C, DME does anyshing?

Yes, Summer becomes high temperature and humidity certainly in japan.