How to tune the digital thermostat?

[Bmj0yp]

I’ve found stinger’s torque map that manages torque by antifreeze temperatures. Maximum torque can be achieved if coolant temp is between 51 and 84C (from 124F to 184F).

But the digital thermostat keeps the coolant temperature at idle and cruising from 100 to 105C (212-221F) and when heated to 105C, it opens the thermostate.

If coolant around 110C/230F, it reduces torque almost twice (at stage 1). It’s good thing to protect the engine and tranny from damage.

BUT the torque is extrapolated by the map between 85 and 110C. For stinger 2.0 you get 350Nm (420Nm st1) torque at 84C (184F), but if the coolant is 95C (203F), the torque drops +-307-312Nm. At 110C the torque is fixed at 250Nm. Take a look to the map at the picture.

Stingers 3.3 have the same problem

So the question is: has anyone tried to change the thermostat configuration?

 

[oddball]

There are extremely few people doing tuning on their own - maybe only one - the guy that posted the quick guide and tools list?
It's really only the shops, and even then there's only a handful that are working on the Stinger ECU.

 

[Bmj0yp]

There are extremely few people doing tuning on their own - maybe only one - the guy that posted the quick guide and tools list?
It's really only the shops, and even then there's only a handful that are working on the Stinger ECU.

What a pity… bmw owners often work out around cold thermostat. Maybe stingers will have it someday too

 

[oddball]

What a pity… bmw owners often work out around cold thermostat. Maybe stingers will have it someday too

There was briefly optimism that someone would figure out OBD2 port tuning back in 2019, but that fell apart. So since it requires removing the ecu, cracking the lid and plugging straight in - you're already down to a very small group that's got the skill and interest to do it. And, frankly, that's not the Stinger customer community.

 

[Bmj0yp]

There was briefly optimism that someone would figure out OBD2 port tuning back in 2019, but that fell apart. So since it requires removing the ecu, cracking the lid and plugging straight in - you're already down to a very small group that's got the skill and interest to do it. And, frankly, that's not the Stinger customer community.

In my country the stingers are tuned through OBD2 port… It seems in the US most people just buy a JB4 or lap3 ecu?

And I didn’t got, what do you mean “it isn’t the stingers customers community”? I’m not a native english, so I can’t understand what you mean.

 

[5tinger]

Unless your doing track time, the coolant shouldn't be anywhere near as high as 110C?

For reference when monitoring the coolant temps of a Kia Forte 1.6t they range between 75-85 when cruising and peak at 98C during hot idling before dropping to around 88 following opening of the thermostat.

 

[Bmj0yp]

Unless your doing track time, the coolant shouldn't be anywhere near as high as 110C?

For reference when monitoring the coolant temps of a Kia Forte 1.6t they range between 75-85 when cruising and peak at 98C during hot idling before dropping to around 88 following opening of the thermostat.

If you’re cruising or staying in city traffic, coolant temp goes to 105C and drops down to 93-96. Then again. Its behaviour because of digital thermostat. If you drive fast, coolant temp never goes higher than 98C (it’s still too much, but much better).
And this temperature range I have in -10C and +20 both. The ecology for our money

 

[Devin]

And, frankly, that's not the Stinger customer community.

Yet. Once they get cheap and beat up there will be a second wind of modding and folks with less money than time will move things along.