I have a 2001 24v (NV5600 not that it matters) and I'm curious what it takes to get the truck to turn 4,000 rpms? I know springs but I'm not sure? I'm getting a lift pump here in a little while (thinking a FASS 150). Before I get a programmer I want to know what it takes because if I'm going to get the truck to turn 4k, then that narrows down my programmer/tuner selection. Can someone tell me how this is done and what parts is takes and a rough guess as to what its going to cost me? Thanks everyone.

Also side question, how much power can a FASS 150 hold? My goal is eventually compounds with 500-600 hp with EGT's that are low (under 1,350*) no matter the load/hill (with in reason obviously).

 

HD pushrods and 110# valve springs

and there are 2 fueling boxes capable of it but one of the companies recently went out of business...

the one out of business but you can still find their boxes at some vendors is the quadzilla adrenaline 4k box

the other that is still in business is the redline box from blue chip.

both will wiretap fuel past the rev limiter to 4,000rpm.

If you want past that you need a p7100 with aftermarket gov springs.

 

Ok thank you, 4k is good for now, it's only a street truck. Is this going to be harder on the motor? Lastly how much is this going to cost? Approx?

 

oh yeah, think you need a new damper too..

cost of box + cost of push rods and valve springs + damper + labor if you don't do it yourself...

last I checked springs and rods are like $300 a set. (each) as in ~$600 for both.

no idea on dampers or the boxes though.

as for your PM question with my truck, No I don't have my truck modified to turn 4k. have no plans to either. I do plan on springs and pushrods though so I can run more boost. but that's it. I have no desire to over rev my engine. and I have seen no performance gains from it either. power starts to taper off before redline.

the extra RPM's are really only needed for drag racers needing that little extra rpm band for more speed. suppose sled pullers could use that extra rev too..

 

Oh ok, i thought it would make a little more power or atleast let you keep the turbo spooked up so after a shift your rpms will fall in the boost. If that makes sense. How come sled pullers go for 4k or some even upto 5400!!!

 

What's the max boost we can SAFELY push out of the stock holset 24v turbo? And is there a boost cooler or an Orphis I can put in the waste gate line to get a little more?

 

its different for those guys as they are not running a VP44. the VP44 is the limiting factor here. a modified 13mm p7100 can push fuel into the higher RPMs and make more power in those RPM's a VP44 simply just runs out of fuel.

hx35 can push 35psi before its out of its efficiency map. any more than 35psi is just over driving the turbo and causing excess drive pressure which can result in a blown head gasket.

you need a boost elbow to get the hx35 to push 35psi. without one the gate will open at 26psi. the elbow has an adjuster screw that limits the amount of boost the gate sees. you don't want to just plug the gate off as if you do that and add injectors later, you will blow the turbo because the gate will never open to dump the excess drive pressure.

 

Those guys running 4k+ are sled pulling or drag racing trucks with camshaft profiles and injection pumps (or dual pumps) and turbos made for pushing the kind of volume required to make serious power.

It takes a lot of power to yank a 40k+ pound sled across the clay and to be competitive in the upper classes.

 

Thanks Jig, All my cummins has done to it is a BHAF at the moment. I'm installing those ISSPRO gauges you talked me into this weekend. So the engine mods are basically non-existent. Can I just buy a boost elbow now like this one:

http://www.ebay.com/itm/150986602491...=p5197.c0.m619

now with these mods? Or will I starve the engine of fuel because of the added boost? or will it even produce extra boost? I guess my question is, can I do this now, or do I need to wait until I have a FASS 150 and Edge Comp?

 

That's how much those sleds weigh??? Holy hell! Explains a lot... Thanks for clarifying the different pumps up for me, big help! Yea, I'm gonna avoid spinning 4k. Plus if my pump holds out it will support my power goals fine..