Originally Posted by
shrekair
Guys, I hate to say it, but I do believe the OS speed TZ has the evo 3 covered. we ran them back to back this weekend at the Latemodel summer nationals. we tried gearing, clutch set-ups, and pipes. in every conceivable configuration the Speed TZ was smoother through the power band, easier to tune and was able to run cooler temps and still rip harder down the straights. The skyline VR12+ is a great pipe on the evo 3 and likewise strong on the Speed TZ. If anyone has any ideas or anything they would like to see tested on a high grip dirt oval i'm all ears. Both motors tested were run on rocket science 30% fuel and both motors have had about 3/4 of a gallon of fuel through them.
I will go with you on the ease of tuning, and they are fast. But there is not a chance that the OS will run with any Picco based engine if tuned right. And also with the Skyline pipe that in itself chops the top off. The only other issue that I see as well asI have never seen a on road OS that will have a piston/sleeve set last as long as the Picco or Nova based engines. Try the same test with the Picco tuned and then run a 2607 or a 2617 pipe. And tell me if the results are a bit better. And we are speaking of the OS Speed right? One other thing is that the truth be known that when OS wants to come out with a fast engine they will. They have the ability to do so. They just choose not to at this point. They are focused now on the off road where for the most part they have dominated. Now they are dabbling in the on road to test the water.
Just my 2 cents though.