Originally Posted by
GMartinez
Based that I have both motors the conrods are not the same you can use the Evo3 piston/sleeve/conrod in the Evo 4 but not mixed matched the sleeve is the same piston as well but the conrods are slightly different in height.
as for the Sirio power clutch it's all in driver preference the power clutch has the same feel for those that have tried the sp kyosho clutch or 2D/4D clutch set up is very similiar but the 3D to the power clutch settings are totally different. cranking down the spring tension on the sirio to 1.2 is to extreme the sirio spring height is taller than the kyosho spring & my spring collapsed very quickly I normally tighten it down from .5 -.8 range very smooth shifts spools up very quickly. Im very happy with it I also installed the Orion spring on the power clutch to make it a little more aggressive & shaved a 1/2 sec in lap times
GM, i did measure the sirio's spring but it is only 9.8mm compared to the kyosho's measured at 10mm some at 10.1mm. But there is a significant difference in the spring tension. Sirio's spring are much harder than the Kyosho's. On cranking the tension of the sirio's spring agree with you about the power it produces when tighthening more than 1.2mm. The power is too abrupt. My range is same as yours.