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Dash pot settings


Lotussuper7

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It seems this is quite variable in my experience, possibly depending on size of throttle and plenum volume etc.  I will attach a few example settings from cars I have tuned but you will notice they are hugely different.  The LS4 needs 7% dashpot throttle, whereas my evo needs no dash pot at all...

To tune it set up a time plot with RPM and idle target one the same plot like pic below.  The idea is you want the RPM to drop down to target as fast as possible without significant undershoot.  

Here is our LS4 race car with our default base map dash pot settings, notice the big dip under target then a big oscillation after the near stall:

4AVTrog.png

 

Now here it is after tuning:

lwnhG3t.png

 

LS4 race engine (E-throttle):

wk3WKLU.png

 

Subaru WRX (Ethrottle):

FPLWgUn.png

 

Evo7 (stepper motor):

qGU4FNe.png

 

FD RX7 (solenoid):

qyWSQg0.png

 

XR6 Turbo (Ethrottle):

cDDDXnD.png

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