HI guys.

I´ve a JDM spec engine with the 11.1:1 compression. What happens when I install a set of GSR pistons. HOw much would the cr lower. The GSR does have 10.1:1 and the combustion camber of the ITR is a bit higher. Where would my cr in fact be?

Thanks!

 

If they are US GSR pistons, you'll be around 9.6:1 or around there.

JDM GSR pistons and you'll be in the 10.1:1 area..

 

Is the piston design the same. I mean the floor of the piston is the correct one for the valves.