Originally posted by jeffreylin
Thanks for all the info AFM. Greatly appreciated.
I have a couple of questions:
1. On Sirio's web site, it tells you that leaning the top and richen the bottom could damage your engine. Now I understand why not to lean the top too much but why would a rich bottom be bad for your engine? I have been running the bottom as rich as I can as long as I can make the run time just so that I have the bottom end pickup coming out of the corner. So how do I know it's too rich in the bottom?
2. WCR or wait for the Evo3?
Thanks again.
No problem Jeffry
1.- Yes if done simultaneously, because the main needle controls the total fuel that goes into the engine, so if you lean to much the incoming fuel, no matter how much you open the LSN your engine will suffer from over leaning. (read my explanation a couple of posts back about mid range needle).
Also keep in mind that once the HSN is properly set, the most critical adjustment is the LSN, because the engine relies on this adjustment for its temperature control when idling on the infield of the track. This is the zone in which the engine does 90% of its work.
If the top speed of your engine is good and the engine runs hot, you should generally richen the LSN. That is how you determine how rich to run your LSN........plus the run time, the 30 second idling, etc.etc.
2.- My sources tell me that the new T3 or Evo3 (not defined yet) has much more bottom power and the same top end as the Evo2 , WCR platform....which was the weak link in those engines, compared to the Nova based engines.
AFM