So it sounds like the governor should be 4,650, but the engine won't be able to make enough power to pull past 4,150 under full load due to the hp peak being at 4,000 and the power dropping off quickly thereafter.

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2012 Volkswagen Passat TDI - 103,000 miles
2004 Volkswagen Touareg V10 TDI - 160,000 miles
2003 Ford F-350 PowerStroke 6.0 -- sold
1987 Mercedes-Benz 300SDL -- 307,500 miles -- Retired
1991 VW Jetta GL ECOdiesel -- 429,531 miles -- RIP
2000 Volkswagen New Beetle TDI -- RIP
1987 Mercedes-Benz 190D 2.5 Turbo -- sold