Originally Posted by Sirio2127
Sirio engine in my exprence are among the fastest engines going the can be hard to tune but when they are tuned corectly there is not much that can stay with them. Regards Jeremy.
I feel there is quite a bit of conflicting information floating around, on what head clearance, glow plug and fuel to use with the .12 STI. I also think it depends on where in the power band you want the most power - either bottom end or top end.
At present, I find that the stock shims, 20% nitro and a Sirio 7 plug does not provide enough bottom end for the track I run on, with either the Sirio or Skyline pipes. Clutch nut on my RRR is 1.2mm and I'm using the stock gearing. It spools up nice and smoothly, but I want a lot more speed than it's giving me. Since I haven't had enough time to experiment with the engine yet, it's possible that I just haven't leaned the LSN enough, need to adjust the clutch or change my gearing.
In simpler terms, my CRF is currently faster than my STI.
