USDM EJ25 Firing order
06-12-2005, 02:12 PM
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USDM EJ25 Firing order
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?
06-12-2005, 04:37 PM
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Origami posted by dunnojack
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?
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?
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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