enginespec for GP9 for passenger service

rgcx

Simply defeated
I enjoy VMD's gp9s, but the enginespec correctly keeps these geeps under 55mph. Can someone recommend a comparable enginespec to permiit these beauties run/maintain passenger speeds? I think 70-80mph would be a good match. I am running 2010. TIA

Copied these ratios from an official gp9 operators manual.

Gear Ratios and Maximum Speeds:

65/12 55 MPH
62/15 65 MPH
61/16 71 MPH
60/17 77 MPH
59/18 83 MPH
58/19 89 MPH
 
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