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695 Posts
Does either programmer offer a 4,000 rpm tune like the Smarty does for the 5.9's? If not, are there planes to offer this in the future?
Posts by Rodram2002
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March's Cummins of the Month challenge is now open for entries!
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Joined
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695 Posts
I meant XRT
Joined
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695 Posts
Valve springs yes, stiffer rods? I have spun my VP 24valve to 4300rpm sever times sled pulling on a stock rotating assembly and my 12 valve has seen 4500rpm several times and they are doing great.
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