HRVP doesn't like fueling boxes?
 

I've been told this several times and remained skeptical. Well I've dyno'd with the tst and I'm convinced. Peak numbers show a max gain of 39 hp/ 87 ft/lbs with the tst over just the smarty run. Overall numbers were short of my 500/1000 goal, but everybody was down on power so I'll try again before to long.

What the tst did do was stretch out the power band. The hp gain wasn't a spike, but stretched from around 2100 all the way past 3200. The nice thing is that power doesn't fall off as quickly with the tst, by 3200 it looks like 100 hp difference. Hp does start to creep down after 2800 a bit, but without the tst power falls off quickly after 2500. Comparing the graphs of my three times I've dyno'd, it looks like the cam really helped bring power in a couple hundred rpms sooner, then the tst stretches that power out several hundred rpms later.

Now here's the part that boggled my mind: spring fling 06- 492hp, spring fling 07 493 hp, Claremont 07 493 hp [verymad] My smarty run was down 39 hp from my previous runs and the tst added 39 hp so no more power when using uncorrected numbers :(

I was sitting in my truck idling while I'm waiting for my turn to dyno and decided to turn the tst up. When it goes into the competition levels it really gets a big cam type of sound to it, even at idle. So I turn the tst up to nine and within a few seconds I counted five people looking over to see what the heck that sound was [laugh] Too bad it doesn't fuel as hard as it makes the truck sound :(

And despite my truck's lackluster performance, I'm told it blew more smoke than all but a couple of the trucks at the event. I think Dave rolled into the throttle too quickly for sw9. I'm planning on trying sw3 next go around.

Anyone know the cure for BB syndrone? [laugh] K31? 200+ sticks maybe?

David, You have a great running truck, dude. We could meet up sometime and trade housings for a week or so. :)

Normally the TST makes best HP on level 6 or 7. Also for dynoing try and use an EZ and not the Smarty, the TST/EZ shows better dyno numbers than the TST Smarty stack. As for bigger sticks jumping above a mach 4 showed no gains...... We took a truck running mach 4's, HRVP, Edge Comp, and a Phat Shat 66 and made 605 RWHP, then changed out for Mach 6's and had no gain.

Doug

I swear I almost die when I hear this!

I too am on the lookout for someone who wants to swap an SO pump for a HRVP44 and see what kinda difference it makes. My TST is picking up roughly 80hp and about 150tq, and the setting on the TST doesnt matter, it makes the same on 3 as it does on 5, 7, and 9 and there is not much difference in the graphs, just alot more smoke on spool up.

I should add that my highest hp run was with the tst on 2, which Dave recommended trying. Highest torque was on tst 9.

when I dynoed my power really didn't change actually my highest HP was on 9

Oh and on an unrelated note, I installed a simflow fuel pressure regulator from Vulcan Performance today. 18 psi at idle and 20-22 at cruise. [guitar]

These numbers amaze me, alot of truck that i see on the forum running a similar setup minus the HRVP as mentioned are seeing 475-515 hp. Is the HRVP real adding that much more power?

The Smarty is a poor stack for big numbers. Use a timing box like the EZ or Power Puck for maximum performance.

You said it fell off after 3200 - Did you dyno with the competition TST with raised RPM?

It's a tst comp and it fuels to 3400. I asked the operator to run it to 3500, but my graphs all run out around 3300.

So ya'll think an ez or puck would be all that different from a smarty running sw3 which is just fuel/timing, not the catcher programming?

Those numbers amazed me as well. The question should be, is the PS66 adding that much more air? I think someones got a little bit of NO2 on the truck.[coffee]

I agree with you Mike D, Maybe Doug will chime in here with a little more info about that setup, it just sounds to easy to get that much power.[guitar]

Yes, the Smarty kills the upper rpm horsepower.

Has anyone proven more horsepower with a hot rod pump on a highly modded vp truck? Any back to back dyno runs? I am considering one, but I doubt it will give me any more power and don't want to waste my money.

I have heard this, and at this point I'm guessing its the fact that the rate limiter is eliminated in the catcher software so the power comes in too quickly. Good for the street, but the lower rpms the power will hit at means lower hp :( PErsonal theory only.

Not at the hp levels you're at. The monster vp44's that people are experimenting with now might be worth looking into though.

I dont notice much of a change from my juice off to kill mode, but i know the HRVP has more fuel not sure on the numbers but a so is something like 260cc and a hr is some where like 280cc(not sure on those numbers) but I do know the HR flows a tad more for a fact. My truck pulls alot harder in the top end with the box on but is about the same with the box off at lower speeds. One thing is my truck will not suck air with the HR and it didnt take much to suck air with the so pump.My truck doesnt like dynos 37s through the numbers off or something. I made 593 and 1009 on a dyno jet but only made 31lbs of boost with Hx40 and a so going south. In tulare with a usb and a hr I made 591 and 1290 on a mustang that was reading about 25% low but its just hard to state facts since I changed turbo and it was 2 diffrent dynos....

Doug, why would there be no gain in this case going from 4's to 6's? Are you already dumping all the fuel available into the cylinder so bigger injectors don't help? Or was he limited by the amount of airflow he had available?

I'm running a drag comp (5x4), smarty, HRVP44, and just went from M4's to M6's and am now considering M7's or bigger... Am I wasting my time?

I'd say once the pump dies go to an SO pump an jump to Mach 6's or 7's and you will have some big numbers. I made the dyno runs in my sig with my smarty on and TST on 9/9 for the first dyno and 3/9 for the second dyno. the biggest difference was twin trubo tunning. I have dynoed the TST on all setting from 5 up and I get my best dyno on setting 9. I found out that I only had a TST PM3 and sent it back and now have a TST Comp and need to get back on the dyno.

I think so. Don's told me that the mach 6 is making the most power with the hrvp currently. As far as I know the highest hp on a hrvp from regular posters in this room is Tiger Rag with 615 uncorrected with mach 6's and bd twins.

I put down 610 with a old piers hrvp, redline and a 40- ht4c set of twins and mach 7's a few years ago. This was on a Isaacs load dyno with 4.10 gears.

I did 696 uncorrected with an I.I. hrvp, SPS62, TST/EZ, and nitrous.

That's awesome.

Makes me want to put the old NOS kit in the garage to use.

Go for it, you have studs and o-rings. No reason not to ;)

This is an interesting thread.

The whole concept of a HRVP makes me wonder. From what I understand, it's basically an SO -27 B&P assembly with a more aggressive HO cam ring in most cases. This would change the rate of discharge curves.

I'm not sure that I think a HRVP is the answer--I mean, we saw Nathan take an SO pump to 700hp on fuel only with twins year ago (03? 04?). What does the HRVP do that the SO can't?

I think the HRVP is one of those things that needs more refinement to work well. For example, I'd say it probably needs a little higher pop-off on the injectors to work properly. I'd want to know exactly WHAT is done to make a pump a "HRVP" so that I could see how that would impact the rest of the system and correct for it.

We all know that HO pumps make more power from a given injector size up to their fueling limit. But maybe it's not JUST all from higher fuel discharge. What if a bigger injector is more optimal as part of the HO "system" as a whole? What if the rate-of-discharge from a bigger stick is better matched to the HO's pump?

What conclusions can we draw from the fact that a M6 won't make more power than an M4 with a HRVP? Perhaps that the rate-of-discharge of an M4 is more optimal with a HRVP? Perhaps it's atomization?

If nothing else, this surely seems to point to the M4 as a more *efficient* injector with the HRVP.

Yet we can turn around and drop that M6 into a standard SO pump and pick up 70hp or more over the M4. Perhaps the HRVP is actually a step backwards relative to making big power? I mean, we've seen a pretty fair amount of 650hp+ 24V trucks, and how many of them were running HRVPs?

Until someone shows me a dyno run where a HRVP of some kind increases fuel-only power with an M8 over an M6 over an M4, I'm not convinced they represent a step forward over an SO pump and a fueling box.

Personally, I'm suspecting that Quad's new race box and a plain old SO pump will be the new bar to meet over any stack for max fuel-only 24V power.

JMO

The more I think about it the more I think this II pump responds to bombs just like a HO pump, but has worse manners [verymad]

We just need a Smarty program to smooth out that horrible idle!!![yuk][yuk][yuk]

[QUOTE=CarcajouCummins;1583110]Yes, the Smarty kills the upper rpm horsepower.QUOTE]


The smarty does decreases high end HP but I wouldn't say it kills it. When I last dyno'd my 01 it wasn't even a 10rwhp diff between smarty and no smarty. What I did like about the smarty is the HP came on sooner in the RPM range. IMO, I'll loose 10 RWHP if the HP is coming on 300 rpm sooner.

There was some software tested, but it didn't help :(

If you turn the tst comp up all the way do you get a ticked off big block kind of idle? Btw who is nadp?

Until recently mine idled fine, but now I get a real choppy idle after the thermastat opens :confused: Started some time after I got the tst comp working good *smacks self in forehead*