Boost PSI while towing

[CToney]

Towed at max GVW the other day. It was windy as well my boost usually arounnd 20psi. My truck will do over 30 psi but only over 2500rpm. 2250rpm ~25psi and not much below 2000 rpm the boost starts falling off from 20psi and them once it hits 15 the truck quits pulling. I was curious on what other 12v ers tend to run as well as how the 24v's differ. I would like more power but don't want to break anything as I probably can't afford to fix it. My old '93 would hit approximately the same psi at 2000rpm but with a 16cm nongated housing(max was 26psi at 2400rpm). The getrag held together for 60,000 mi. I would think the NV 4500 would handle more power?



Free express your opinion and past experience.



Thanks

CR Toney

 

[surfbeetle]

Mine would only do 20psi max boost until I added the TST plate with its new fitting for the afc. Now it hits 30 psi boost max. My 5vr is about 11,000 lbs.

 

[MPerez]

My old 98 NV4500 ran at 35+ PSI max, when towing really heavy (5'er weighed 14,700), and it was a 12V. I had a lot of mods to it... Never exceeded 1,250 EGT, this pulling at 50 mph up a 6. 5 % slope. Normal flat towing was usually 10 to 15 PSI if fighting wind.

 

[CToney]

I assume that you were in 4th doing 50mph. I am thinking I should pull my plate and trim a little on the bottom slope of the #10 to give a bit more bottm end. I don't want to turn the gov arm screw out to much and lose it.