Yes your ground speed is down and your ability to lug is the biggest factor. When you put stiffer spring in it now takes more rpm to sling the wieghts out and advance the timming . The dyno shows that your initial timming is low making the peak torque lower after the spring change . It also shows that when the rpms get higher requiring less initial advance timming the the torque runs flatter and higher. typical of needing less timing to pull on the top end of rpm range. hope this helps
Re: farmall m update in reply to mlpankey, 11-20-2012 06:25:55
Well I guess I'm gonna have to get the timming light out and start recording some numbers.
So looking at what I have here, you think the low end rpm range needs more initinal timming? So in order to keep the same high end rpm timming I either need a stiffer spring yet or a distributor with less total advance.
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