Pressure Box's and codes.

[fencebuilders]

With all the talk of pressure box's exceeding manufactures maximum fuel rail pressure,has anyone ever thrown code P00088? This is the "Fuel rail pressure too high" code. I have never heard of this code being set. Has anyone?

 

[MUDDY]

i only know of 1 on an idaho truck running the b-dog fp box on the 90hp setting

 

[Prairie Dog]

The TST doesn't raise pressures beyond stock - just raises them sooner. I guess the others must only raise it to a point just before the code snivels.

 

[SRadke]

TST does not actually raise the pressure. It adjusts timeing and lengthens the pulses.



-Scott

 

[DLeno]

Originally posted by fencebuilders

With all the talk of pressure box's exceeding manufactures maximum fuel rail pressure,has anyone ever thrown code P00088? This is the "Fuel rail pressure too high" code. I have never heard of this code being set. Has anyone?

Have you seen this one fencebuilders?

Unless I'm mistaken, by definition a pressure box is not capable of setting this code without a box malfunction. thats because the ECM sees a fooled analog pressure signal provided by the box and does not measure actual rail pressure.



If actual rail pressure was visible to the ECM every pressure box on the planet would set this code. Except for Dr. performance that is.

 

[fencebuilders]

Not yet Doug I downloaded a code sheet and saw this code listed. It kinda piqued my curiousity,especially with all the pressure talk lately. Hope i never see it either.

 

[OT-OF-HERE!!]

Originally posted by SRadke

TST does not actually raise the pressure. It adjusts timeing and lengthens the pulses.



-Scott

Is the TST a plug and play? Is it easily removable like the EDGE and if it is,... . is there any indication you had a box on your truck if you had to take it in to the dealer for service. Appreciate the input.

 

[SRadke]

It is plug and play. I'm not going to say it is "easily removable" because there is an in cab remote and depending how you routed it it may take a little doing. That being said I installed mine (having never seen one before) in about an hour. I already had the pyro probe in the manifold so I just switched the wires for that. There is a total of 6 plugs, one ground wire (unless yours is a very early model), two power wires that use fuse taps, and the remote.



-Scott

 

[hotram03]

Service guy I know well at the local dealer said there is a tattle tale in the ecm system to register a electronic box, he said dc and cummins can find this out, dunno if its true or not, anyone else ever hear of this?

 

[DLeno]

In my opinion, it would take someone very experienced and very passionate about trying to prove that a box had been connected. First of all, note that the way all currenly marketed boxes operate is to let the ECM do all the work -- analog inputs are fooled and the ECM just reacts to those inputs. All inputs are within factory maximums and the ECM thinks it is operating within those limits. If that were not the case, boxes would set codes.



I still say that the most compelling evidence of a box is physical (connectors, velcro, dust patterns, whatever). the only way an experienced and passionate engineer would know is for the ECM to keep a long history of analog input values (not likely, there's not enough RAM to keep more than a few seconds -- just my opinion here). Assuming that the ECM keeps enough history they could look at:



1. boost history. repeated maximum boost levels of precisely and exactly the same value would suggest electronic boost fooling.



2. low fuel pressure readings and trends inconsistent with high boost. pressure boxes tell the ECM that fuel pressure is low so that the ECM will raise pressure.





thats all I can think of at the moment. maybe timing signals from cam or crank.



I just don't think the ECM is capable of retaining that much data. and even if it were, as I say it would take a very experienced and very passionate individual motivated and suspicous that a box had been present.