hi guys, i have done all the research and i think i have read all
the threads on what one chip does and what the other does not.
so with out a bunch of dyno chart and rail pressure data, bottom
line,what is running 25000 psi going to do to the life span of my
305hp engine? i have tried several boxes on a trial basis and with out a doubt, the pred 3 is the best performer,imho. i have read that rail press relief valves may start to give out, i realize that if you play you pay, i just dont want my engine blowing up at 20.000 km for an extra 100hp.

 

Just curious,..did you measure the pressure and find it was 25k or did they (Predator) tell you it was 25K? From what I've read I don't think 25k is that high and I'm a bit surprised if it is only 25k,...unless I'm misremembering the threshold for the line pressure.

 

Doug has discussed all of these pressure level issues or concerns. It most likely makes more than 25000 psi to make 100 hp. Do a search...

 

yea, i think that it was around 25000 to 27000 psi, from what doug has said this is within the limits, my concern is that it seems to always be that high, he has mentioned that a stock engine
is running at around 12500 psi at 65mph vs 25000 psi with a pred 3, so even though it is within limits, will running it at the upper level, so to speak, hurt the rail and its componants over
a sustained period?

 

Just curious,..did you measure the pressure and find it was 25k or did they (Predator) tell you it was 25K? From what I've read I don't think 25k is that high and I'm a bit surprised if it is only 25k,...unless I'm misremembering the threshold for the line pressure.

 

The difference here is...Predator runs a higher rail pressure at lower horsepower levels...which effectively shorterns the durartion pulse. This was done seeking additional mileage benifits. So the peak output of the box is no different that other 100 hp pressure boxes...just higher at lower engine outputs. I would think that it might shorten the lifespan (to what degree is unknown) of the fuel system since it is working harder all of the time.

 

I think the peak HP for Predator may be higher than other "100HP boxes" because so far in my measurements, the predator acheives higher peak pressure than the others. They're at 27,000 psi and all the others are at 26,000 or 26,500.

As I play with more boxes, It looks like other aggressive pressure boxes (like volumizer, Quadzilla) also raise pressure to the 20K region at moderate boost levels, so at this point I don't see any real astonishing or distinguishing characteristic to the predator in that regard (that is, forcing duration down with an increase in pressure at nominal HP levels).

I'm not sure what to say about running nominally at 20,000, which is on the order of 5000-7000 higher than stock. I'm inclined to say 'whats the big deal' but we have no long term reliability studies either way. The injector seals (long term injector reliability) would be the issue there, and the only example I know of where injector seals failed was very early on in the 03 model year (could have been bad injectors) and the EZ on level 6 (too high rail pressure).

the rail itself can easily tolerate these pressures and higher. the weak point is the pressure relief valve. Edge tells us to avoid more pressure than their box makes, and I've measured that pressure at 26,500. The predator is higher than that, although not by much. EZ level six has already been verified to blow the valve.

 

great info guys, thanks again..... i bought the pred 3 today and am amazed at the results. I guess we will have to wait for the jury on this one, and hope that no major issues arise.......i guess the smart thing now is to install gauges.

 

doug

Does the Predator Stage II for 325/600 (fuel/boost) use the same processes as the Stage 3 in terms of rail pressure?

Should I have the same concerns about the Stage II as the Stage 3?

I am impressed with the Stage II so far. If I drive it normally I do see some, 1 - 1.5 mpg, milage improvement. It definitely increased the low end acceleration more than I expected.

 

I'm at a disadvantage (in answering this question) because I don't have a 600 and I haven't tried a stage 2 on the 555 yet either. But peak pressure PROBABLY corresponse to peak HP. I'd expect the stage 2 to have a similar (high nominal pressure) philosophy but not as high of a peak HP as the stage 3.