I'm trying to figure out the differences between the JDM Integra siR-G and the USDM Integra GS-R. I know the siR-G c/r is 10.6:1 vs. the GS-Rs 10.0:1, but what makes the c/r different? Is it just timing? Is there a way to convert the GS-R motor to the siR-G motor? By that I mean just changing whatever so it'll have the extra 10hp?

Thanks in advance!!

 

Pistons? Timing does not make C/R higher.

 

Diff is the pistons I should think. WAY too much work for 10 hp ...

 

I researched this a while back and the answer I came up with was that the ONLY thing different is the pistons. The ECU is also different though. Aside from having a 120 mph speed limiter I also heard that the fuel maps are richer or something.

 

Yea way too much work for 10hp. Thanks guys.