new to this
 

is it possible to turn up the pump on a 98 6.5 td without the ecm?

no your going to have to get an upgraded ECM from companys like
this
Chevy & GMC 6.2L & 6.5L Turbo Diesel Performance Parts


http://www.dieselperformance.com/

SSDiesel Supply :: GM 6.5 TD Specialists, PMD failure, FSD heat sync kit.

http://www.kennedydiesel.com/

http://www.heathdiesel.com/