speedisgood

Im thinking about buying a 12TR p t (turbo) so if anyone out there is racing one in 1/10th on road I would like to know how its going and how it is to tune.

Dexter

OS's are on of the easiest engines to tune and are generally very user frinedly. Performance wise if tuned well it could be competetive on a short to medium size track but it runs out of legs when compared to JP's and company on long straights.

bleach1

I upgraded from a OS 12tr to a JP not to long ago and on shorter tracks the lap times were very similar with the JP only ever so slightly ontop. The OS was still quick on a larger track but the difference was far more noticible between it and the JP.

speedisgood

hi bleach1
Is your 12tr the black turbo one? 1.3hp
the os would probly be closer to a novarossi s3 than a jp in top end?
did u wear out the os or just wanted more power?