Does anyone know what is the firing order of the USDM sti motor? is it possible to change that order if a different header is installed?

 

Firing order for both the USDM STi 2.5 and 2.0 is 1-3-2-4.

I don't think it is possible to change the firing order unless a custom crankshaft is ground. The crankshaft throws are ground to position the pistons at top dead center in the firing order. The ECU must also be modified or a standalone system must be used. The factory selected the firing order for optimum balancing and minimum harmonics.

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0==WW==0
"…axles of evil…" - george w. bush

 

wow, thanks! also, does anyone know which wire is positive and which wire is negative on the avcs solonoid on the sti motor?