lowmac Posted September 21, 2013 Share Posted September 21, 2013 how do u get more speed out 96 rb 400 truck stops at 120km how do i make it go faster than that Quote Link to comment https://www.bigmacktrucks.com/topic/32858-need-more-speed/ Share on other sites More sharing options...
j_martell Posted September 21, 2013 Share Posted September 21, 2013 How much more do you need? I'm stuck at 105kmh, and I get by....... Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/32858-need-more-speed/#findComment-207436 Share on other sites More sharing options...
bobcotkg Posted September 21, 2013 Share Posted September 21, 2013 Turn up the RPM is the fastest way. Maybe not the best way.. I imagine the valves will float around 3200, so don't go that far! Higher gear ratio in rears, taller OD in transmission, bigger tires, or combination of all. Quote Link to comment https://www.bigmacktrucks.com/topic/32858-need-more-speed/#findComment-207437 Share on other sites More sharing options...
rsb502 Posted September 21, 2013 Share Posted September 21, 2013 96, so VMAC 1 E7 400, you can get the rpm up a little but youll end up hurting the engine running over 2000 for long periods, change the rears out, you can find a set of takeout carriers for about $1000-$2000 and get whatever gearing you want. if my math is right 120kmh is about 75mph, how fast do you need to run or are you trying to get the rpm down running 120, Im guessing your running 4.42 gears topping out about 75mph, go to 4.17's and youll get about about 80mph or 130kmh and your rpm will drop to about 1850 @120kmh. I am assuming 2000rpm @ 120kmh with a 42" tall tire and a .74 OD. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/32858-need-more-speed/#findComment-207440 Share on other sites More sharing options...
lowmac Posted September 22, 2013 Author Share Posted September 22, 2013 the diesel pedal is electric and truck automatically stops at 120km. do these hav a port where a computer plugs in to change that it runs now at 1800 rpm all i need to go 2000 rpm i agree anything higher is not good n wouldnt want to go higher Quote Link to comment https://www.bigmacktrucks.com/topic/32858-need-more-speed/#findComment-207764 Share on other sites More sharing options...
rsb502 Posted September 23, 2013 Share Posted September 23, 2013 You can turn off the max rpm limit on newer trucks don't know about vmac 1. I don't know what limit there is to set with vmac 1 it could be roadspeed and it could be engine rpm, either way you'll need to go to Mack or someone with Mack Software to check it and up it. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/32858-need-more-speed/#findComment-207973 Share on other sites More sharing options...
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