Originally Posted by
rmdhawaii
Raced my stock .12 STI in my RRR for the 3rd time today and I have to say, that I'm pretty disappointed with it's low end performance. I must be doing something wrong.
First two times I raced it, it spooled up real nice, but it wasn't very fast. In the infield between turns, it seemed to take too long to spool up. It could keep up with other cars on the 250' straight, so the top end seemed fine.
Ranier:
Much probably, your engine isn't fully broken-in. Mine STi's were a PITA to break in and one needed almost 10 litres to wake up (now is a monster).
I don't see nothing bad on your setup (well... those Skyline pipe... haven't tried, but the stock pipe does wonders, so I stick to it). Switch to a #7 Sirio plug, tried the #6 and #7 and prefeer by far the #7.
For what you're telling it sounds me that your engine isn't fully broken-in and it cannot stretch their legs too. You don't say how much fuel has been thru the P/S but.. looks very plausible to me that still lacks break-in. When broken in, the low end needle on the Sirios needs to be a tad leaner than on a Nova milll or similar, they love to go with the LSN quite lean (how much? easy... if you were adjusting a Nova, the adjustment should be 'too lean' - they need a different approach to adjusting the needles).