Country boy, what kind of pressures are you seein with the tst rp on 4?

With mine on 3 I hit 27k real quick, I have rail option on my tst but I use the mp instead because I KNOW on my truck it is smoother and feels faster and is much nicer to drive and others with some trucks much more impressive than mine that have been doin this much longer say in the in the mp8 will yield more overall hp and the curve is flatter wich is why I think mine drives smoother.

But 95% of the time my mp8 is off.

 

The 03-04 engines use 2 ( pilot and main ) injection events VS. 3 ( pilot, main and main ) injection events on the 04.5-07 engines. The 03-04 engines use a pressure map that runs lower across the board throughout the RPM range VS the 04.5-07 engines.

Just off idle, cruising down the freeway, WOT, everywhere- the 04.5 and up engine rail pressure is much higher than its predecessor. Highway cruise may be up to 18,000 PSI on the 04.5 while the 03 is lumbering along at 13,500.

WOT blasts on both engines take time to build the factory MAX pressure though. Just before the 3rd gear shift into OD is about where you see a peak pressure spike and then it begins to settle back down.

Yes, both systems can run as high as 26K in stock form, but they are rarely in this range. Only for brief periods as explained earlier.

Adding a pressure box ( depending on how it is programmed and the settings ) changes this. Oftentimes this can be drastic, sometimes not. Typically a stock truck will have no problems with added pressure. Of course this depends on how fast the pressure is allowed to build by the new mapping.

Adding a modified pump to the mix only allows the pressure to build faster. Each stroke on the modified pump is more efficient and can fill the rail ( system ) faster with pressurized fuel. With the modified pump and a remapped pressure curve using a box, the pressure can get to the commanded pressure much quicker. This commanded pressure on some boxes is high enough that with rail caps that eliminate the pressure bypass valve, values as high as 39,000 PSI constant ( read: not peak ) have been measured with equipment from Honeywell.

Once you add the extra injection event to the 04.5 and up engines, you will have additional wear on all moving parts inside the injector. Coupled to pressure that is ramped faster and higher...it is easy to see how the injectors will fail faster. Everything from control chamber seats and nozzles can be affected.

If you have a modified CP3 and an aggressive box, keeping it turned off or down will help everything last longer.

Rail caps became needed with the modified CP3 as the factory valves fail rather quickly with the modded pumps. Keep in mind as well that your rail gage is only as good as the factory sensor. The factory sensor will drop out and become inaccurate around 28K. Since we measured 39K in an 03 engine with a pressure box, modified pump and rail cap...it is entirely possible many of you are doing the same or more as the pumps get more and more efficient with updates.

 

Hey Don,

On my truck, is there any downside to going with Flux 3's instead of Flux 2's? Will I be risking damaging anything or will I only notice the extra power!!!!

 

This is getting confusing, Floor It told me 20,000 is a good number for making power.
But does that mean I can run at 20,000 all day every day? Because thats what im pretty much seeing.
Smarty reduced timing & Sp on power 1 .
Almost all acceleration pressure is hanging around 20,000.

 

Flux 3's are fine D, especially in the winter (:

Doug, you have a rail gage from Dleno, the DiPricol one?

 

SWEEEEEEEEEEEEEEEET That's what I will want on mine then when I send them next week. You will probably get them Tuesday!

 

for lack of a better term: YEE HAWWW

 

1000HP here we come!! Now I just need my new twins (since I don't think these ATS's are gunna get me there), and we will see what we can do!

 

Yes, but I'm the only one having trouble with its readings.
sometimes it reads high & sometimes low.
The SP box also reads pressure & it has confirmed my findings. Its almost always off a little. And sometime reads 3000 at idle.
Not to get off the subject but. This whole electronic thing is irritating me . My 12 valve is hands down more predictable.

 

I wonder if your pressure sensor in the rail is faulty? If two gages are both acting funny, it makes me wonder. Since they get their signal from the stock sensor.

Typical idle pressure is 5200 on the 04.5 if my memory is serving me today.

 

My idle at start up is around 7-7.5 after warmin up it drops to a little above 5.

With my mp8 off and tst on 3/1 or 2/1 I am all over 15-24K and some times 25 but crusin is usually about 18-21.

 

I believe the SP is reading correctly, & with Smarty in the mix it might ramp up quicker. Ive had trouble with the Optix gauge from the get go. Ive seen it drop out to 3000 while the SP remained at 7.50. With no change in idle sound or feel.
Ive changed the power source & ground source with no improvement. And sent the gauge back for testing. Doug ran the gauge in his truck & it read about 5 to 10 percent off on one occasion,but it never dropped out to 3000. Doug Leno & Eric at Dannin have been trying to get this sorted out for months now.

 

Since the power comes on so much smoother is it easier on my little stock turbo. What i mean is with the MP-8 boost comes on in a much more controlled manner, would this make it easier for the stocker to survive. I know im gonna need a new turbo someday (its the slipping clutch thats keeping it alive no). Ive still got the stock boost elbow on and boost only peaks to about 32 and then falls back to around 27 or so, just wondering what you guy/gals think. Thanks Joel