EZ and fuel rail pressure...

[Sarge]

Always curious about what is going on with my HPCR system, I went to see a fellow TDR member that is the diesel mechanic at my local Dodge dealer last week. He got one of his scanners and we went for a ride with him working the scanner. The EZ has 3 levels of power, 25-45-65 HP, and adds a max of 100 ft # of torque.



The pressure came on quick, but in checking all three power settings, the rail never read above #24,000. That was good news for me, as I get into the throttle pretty hard on the long grades with the 5ver, like Cajon Pass.



I still keep an eye on the EGT's, but it's nice to know that the rail pressure is still within limits. At the top end there was definitely a flattening of the power band, most likely the waste gate opening. The max boost I would see was about 32# before the waste gate opened.



I don't know exactly how fast I got up to speed, but when one of Buena Parks finest walked up to my window he said it was 66mph . Oops... .

 

[Matt400]

The pressure came on quick, but in checking all three power settings, the rail never read above #24,000. That was good news for me

Since the EZ fools the ECM into thinking it has low pressure so it will command more, I would expect what is read on any devise plugged into the ECM is fooled and not actual pressure.

 

[Tomeygun]

Since the EZ fools the ECM into thinking it has low pressure so it will command more, I would expect what is read on any devise plugged into the ECM is fooled and not actual pressure.

My thought exactly, The DRB was seeing a "fooled" value, I bet

 

[RockinJ]

EZ and True Rail Pressure

Yeah . . . but has anyone determined what rail pressure the EZ is really producing on an 04. 5+ in levels 1, 2 and 3?



Is it still within Cummins' tolerances for rail pressure?



RJ

 

[BHolm]

Yeah . . . but has anyone determined what rail pressure the EZ is really producing on an 04. 5+ in levels 1, 2 and 3?



Is it still within Cummins' tolerances for rail pressure?



RJ

That is the question I have as well. I would like to go with an EZ and Rokktech sensor but if I can not determine what Edge is doing with the EZ I will probably choose the VA box instead.

 

[JCleary]

you can tap into the rail pressure sensor with a voltage meter to see what the real pressures are, the conversion is listed somewhere in this forum or Products/Accessories Engine/Transmission forum.



Also SP Diesel (I think) is working on a pressure box with a display of actual rail pressure, not the fooled value. I think it will be a good alternative to the EZ, especially since it's an adjustable pressure box. It will also tell you if your rail is sucked dry.

 

[Buffalo]

Rail Preasure

Hi,



I, recently, read that it takes 1000lbs. of preasure to develop 13-15 HP. So, at the 13 HP level, it would take 5000lbs. of extra preasure to hit EZ's 65 HP level.

Does that sound about right, to you guys?



On my '03, HO, I've been thinking about going with a Van Aaken C 3. 2 (duration, only) box with the "Tone Ring Mod" to add a bit of timing. Does anyone know if you could stack a preasure box, like the EZ, with this combo? I've read that a small bit of preasure (15 HP) is beneficial, something like the EZ on it's low level.



Thanks.



Joe F. (Buffalo)

 

[JohnArnold]

I read on nwbombers that the EZ on higher levels will damage (erode) your injectors. You should look into it.

 

[Sarge]

That's true, and we discussed the fact that the EZ most likely has an electronic boost fooler built in, as we watched the numbers on scanner. However, with the manual boost gauge only showing a momentary peak pressure of 32#, it is doubtful that the rail pressure exceeded it's max perameters. Under heavy load (11,000+ pounds) pulling a 6% + grade in 5th gear at approx 2500 to 2700 RPM the boost is showing 28 to 29# steady.



I tow with the Edge set on the middle (45 HP) setting as recommended by Edge. In fact, the entire reason for buying the Edge was to replace the step I lost after having the TSB for reflash of the ECM performed earlier this year. Before the reflash I would see 32# of boost peak with no BOMBS what so ever.



Between the Rokteck sensor and the EZ, I have returned the truck to the original performance level before when it was new, and picked up 1 MPG while towing to boot. As indicated in an earlier post I had made, 4700 miles of towing over a month long period gave concrete proof of that. The combo of these two mods is ideal for a little extra punch while towing, while not dramaticly exceeding the specs of the stock parts of the motor, or clutch, IMO.

 

[JCleary]

I found what I was looking for! Here are the conversion values as copied from a post on this site (I think from Matt400):



To monitor rail pressure all you need is a good quality digital volt meter.

Connect pos to the center wire on the rail pressure sensor and neg. to ground.

If someone doesn't post the chart of voltage = pressure, I will edit this post and post it once I dig it up.



Edit-

0 psi = . 50 volts

5801 psi = 1. 39 volts

10153 psi = 2. 06 volts

14504 psi = 2. 72 volts

20305 psi = 3. 61 volts

23206 psi = 4. 06 volts

26107 psi = 4. 50 volts

26700 psi = 4. 56 volts



26700 is the max you can accurately view because that is the point the OE transducer gets saturated so even though it has a supply voltage of 5v the pressure calculations from 4. 57v to 5. 0v become questionable

 

[Matt400]

dan. poitras was the one who originally posted the chart off a Cummins wire diagram.



I added in one or two entries based on what I found using a sensor simulator and the original calculations.

 

[JasonCzerak]

Curious, when you stack these boxes. for example:



Hot Juice + Ez. (something I plan on doing down the line). when it comes to the map sensor on the Ez, do you still plug it in the map plug? and then the Attitude on top of that? Kinda like chirstmas lights. Wouldn't that "fool the first fooler?"



What about other plugs they may share?

 

[Tomeygun]

Curious, when you stack these boxes. for example:



Hot Juice + Ez. (something I plan on doing down the line). when it comes to the map sensor on the Ez, do you still plug it in the map plug? and then the Attitude on top of that? Kinda like chirstmas lights. Wouldn't that "fool the first fooler?"



What about other plugs they may share?

I always put the Big box first, on the engine map plug, Then the EZ on to thatm then lastly the output of the ez plugs into wire going back to the ECM

 

[JVolpe]

I ran the HOT Juice/Attitude with an EZ stacked. Juice MAP first, then EZ and then factory. Never any problems with that stack. Very consistent and smooth. Never threw a code of any kind even on Juice 5/5 & EZ on 3.

 

[GWoody]

I have a spa gauge that measures rail pressure before the ez fools the ecm. With the ez on the 65 hp setting it appears to raise rail pressure about 3000 psi. With the ez unhooked the max pressure I've seen is 23600. With it on the high setting I've seen 27000, but the factory sender is supposed to be good to only 26700.

 

[JCleary]

I have a spa gauge that measures rail pressure before the ez fools the ecm. With the ez on the 65 hp setting it appears to raise rail pressure about 3000 psi. With the ez unhooked the max pressure I've seen is 23600. With it on the high setting I've seen 27000, but the factory sender is supposed to be good to only 26700.

What do you see with your cruise control on?



I read in another thread (either here or DTR) where Quad did some tests with pressure boxes. He said that some boxes interpret the MAP and Rail readings differently, and some (I think he meant Edge) command up to 27,000+psi at cruise speeds on the highway with the cruise control set.



He claimed his box only raised rail pressure about 1000psi over stock pressure at cruise speeds.



If the fuel rail is running at 27k psi all the time, I would bet the relief valve, as well as the injectors will suffer the consequences before long...

 

[GWoody]

The Ez for the 04. 5 is in cab adjustable, 25, 45, 65, I stay on 25 unless I'm on it for some reason and the cruise set on 80 pressure reads 21000 to 22000 but if you change to the nesxt setting up, 45, it'll jump about 2000 psi, on 65 add about 2000 more so on the upper setting it'll hover over and under 26000. A freind of mine has an 03 and on his it cruises at a lot less pressure, 80 mph = 14000 psi, then when he gets on it it will go to 26000. Not sure if all 03 are this way but his is.

 

[Matt400]

One thing too to be careful with that I noted is a 2000 psi difference between 03 and 05 with no boxes. Probably good reason why the Juice adds no pressure on the later model, pretty high already.

 

[JStieger]

On my '03 with 100 HP injectors I see using the SPA:



->8,xxx psi right after starting it, which drops down to...

->5,300 psi at idle (Juice off, through level 1-5)

->12,000-13,000 psi at steady 75 mph cruise empty on level road (Juice off, through level 1-5)

->~15,000 psi at steady 75 mph cruise empty on 6% grade (Juice off, through level 1-5)

->~24,000 psi at WOT with the Juice off or level 1

->~27,000 psi at ~2100 rpm at WOT with the Juice on 5 - then pressure progressively drops to about 14,000-15,000 psi after 2100 rpm to 3200 rpm

 

[GWoody]

I'd sure like to know if all the 04. 5 reads as high as mine at idle, 6900!!!