Setting up EGT limits

[MichaelR32GTR]

I’m running a link g4+ fury with an ecumaster egt to can module with 6x Haltech k type egt thermocouples 

 

all is working great, as expected 

 

is there a way to setup safety limits for example a certain cylinder reads hotter then the engine will be limited to a certain rpm etc ?

[Adamw]

You could do a virtual aux like below so if any of them go above say 750°C you take action.  That action could be anything from flashing a warning light, add extra fuel, lower boost, or activate a GP limit, etc.

[MichaelR32GTR]

That’s fantastic !

 

in your opinion what would be the best action to come into affect once a cylinder does goes over say “750 degrees” ?

 

ive got fuel pressure and oil pressure and map limits currently but I want the egts to do there job 

[Qshot pilot]

Sorry to jack your post Michael but Adam I was wondering about something similar to this as well like doing a fuel trim table for each cylinder egt? What would be the best way on going about setting that up as I do have the ecumaster Can egt module as well.

[MichaelR32GTR]

Interested about the above aswell as my question 

 

thanks 

[Adamw]

I have never really used EGT's as a safety tool so dont have a lot of advice.  Adding fuel doesnt usually make much difference assuming you are already richer than stoich.  If you are leaner than stoich due to a fuel issue or something, then adding fuel actually increases EGT. 

Unless you are regularly exceeding what you think is a safe EGT then as a safety I would probably just do a limp mode type limiter if it were something I was worried about.  

 

11 hours ago, Qshot pilot said:

Sorry to jack your post Michael but Adam I was wondering about something similar to this as well like doing a fuel trim table for each cylinder egt? What would be the best way on going about setting that up as I do have the ecumaster Can egt module as well.

As above, fuel is not often useful to control excessive EGT.  But if you wanted to you would enable the individual cyl fuel trims, and make a table something like below for each cyl.  This example would add 20% fuel to cyl 1 if EGT 1 went above 749°C at high boost, and add 10% fuel if boost was below 100kpa.

[Qshot pilot]

Thanks Adam I was thinking along the same line but thought I would ask the experts before doing costly damage from my own experiments. So for instance if it wasn't a boosted application we could use Rpm or Tps% on the Y axis in order to try balancing the cylinders.

[Adamw]

46 minutes ago, Qshot pilot said:

So for instance if it wasn't a boosted application we could use Rpm or Tps% on the Y axis in order to try balancing the cylinders.

Yes.  

[Qshot pilot]

Thanks Adam

[MichaelR32GTR]

On 9/22/2020 at 8:54 PM, Adamw said:

You could do a virtual aux like below so if any of them go above say 750°C you take action.  That action could be anything from flashing a warning light, add extra fuel, lower boost, or activate a GP limit, etc.

Looking into setting this up, 

 

once the virtual aux 1 has been setup like urs above for example,

where and how do I go about setting an rpm limit table to Limit engine rpm once the egts reach desired temperature ?

 

 

 

[MichaelR32GTR]

On 9/22/2020 at 8:54 PM, Adamw said:

You could do a virtual aux like below so if any of them go above say 750°C you take action.  That action could be anything from flashing a warning light, add extra fuel, lower boost, or activate a GP limit, etc.

So I set up my virtual AUX 1 as shown above (just different egt temps)

 

how do I go about actualy setting up an rpm limit once they reach set temperature ?

[dx4picco]

GP rpm limit

Configure it similarly the the example available in the Help file for oil pressure, but replace the axis with your EGT and the threshold you want

[Adamw]

If you are doing it with a virtual aux then put the virtual aux on the axis of a GP limit or 3D RPM limit table.  With the virtual auxes "1" means off and "2" means on.

Example below I have set the main RPM limit table to 3D, virtual aux 1 on the y axis.  I have a 8000RPM limit when VA1 is off, and a 4000RPM limit when VA1 is on.

[MichaelR32GTR]

Awesome thanks 

[MichaelR32GTR]

On 10/9/2020 at 7:43 AM, Adamw said:

If you are doing it with a virtual aux then put the virtual aux on the axis of a GP limit or 3D RPM limit table.  With the virtual auxes "1" means off and "2" means on.

Example below I have set the main RPM limit table to 3D, virtual aux 1 on the y axis.  I have a 8000RPM limit when VA1 is off, and a 4000RPM limit when VA1 is on.

Sorry one last question, I already have two “RPM GP limits” setup, one for Lambda and one for Oil pressure,

 

how can I setup a 3rd GP rpm limit so I can setup the above 

[Adamw]

Set your RPM limit to 3D like my example above.

[MichaelR32GTR]

My rpm limit currently is in 2D table mode and advanced mode is ON

 

will switching to 3D table and advanced mode off as you say, make me loose all my rpm cut settings ?

[Adamw]

You don’t need to turn advanced mode off.  The limiter settings will remain, just the table will need to be set up.