Engine/Transmission (1998.5 - 2002) Comp Pump wire connected...

[Gary - K7GLD]

For those out there curious about "real world" observable differences between using the Comp WITHOUT connecting the pump wire - and then connecting it - I found out!



The Comp makes a great difference from stock WITHOUT the wire attached - but I was seeing a max of about 28 psi boost, and a fast EGT rise to 1100 degrees WOT and empty. AFTER connecting the wire, and leaving the level at 1x5, boost went to 32 psi (blew the dang guage hose offa the fitting! ) - and EGT maxed out at around 950...



Able to make as much smoke as I want , and even at the SAME level 1 settings, definitely more power with the wire attached... And when you start going up the scale of settings, this dang thing starts pulling like an HO Cummins SHOULD pull!



Fuel pressure remains unchanged - even with the Comp on 5x5 at WOT, pressure at the VP44 never falls below 16 psi - thanks to the added Carter 4600 pusher pump...



Now to head for the hills with the trailer...

 

[RADdodge]

Bombs Away

Ah... To BOMB or not to BOMB? That's NOT a serious question. BOMBs away

 

[Whitmore]

Gary, did you have to buy an electrical adapter for the comp so it would fit the 02 , I am told one of the connections is different than the 01 ?



Kevin

 

[Gary - K7GLD]

NOPE - no "special" connector or adaptors required - my Comp box was clealy marked as being for a '02 dodge...



I didn't use a "Scotchlock" gizmo to connect to the VP44 pump wire - don't think there was enough slack to use one anyway - instead, I used a sharp awl to pierce the outer covering of the 2 inner wires, and then thru the insulation of the appropriate wire for the Comp. Then I threaded an insulated, tinned wire thru the opening I had made, crimped the wire securely, taped it (not easy in the space available!), and installed a nylon cable tie VERY tightly around the connection point to maintain tight contact. It looks neat, but I'll have to wait and see that the connection remains reliable - nothing serious can result even if it doesn't, and if necessary, I can always solder it - which is preferred anyway, but hard to do neatly at that point...



Seems like on my truck, they were REALLY trying to save on wire - the LP wire was barely long enough to reach the pump - VERY hard to connect my relay control wire to it in the space available - and the pump wire on my VP44 was also quite short and hard to work on - plus, it is VERY tightly contained with the other wire of the pair inside some sort of protective outer tubing - and to use conventional methods of connection, you'd have to strip most of that covering off somehow to fully expose the inner wires for attachment by the Comp - not an easy chore in the work space available, and IMPOSSIBLE to conceal for those who worry about warranty issues...



But man, does this baby RUN!

 

[nickg]

I also connected my wire to the pump but did not do anything to the turbo. I have the Pulse unit. I will be towing a 5ER 10,000lbs.

I am curious if anyone has done the same out there and what kind of performance did you get? I was going to start off with it in the 3rd highest of 4 settings. I don't know what this will do to the fuel pump that has been discussed, should I install the banjo bolts and a additional pump to help out the main pump.

I did feel like it has more power with the pump and ground wires connected. I don't know if it really inproved the torq though.

I have a dtt upgrade 89%t/c v/b etc. no boost gauge maybe i should get that to go with the egt&transmission temp.

 

[Oxjockey]

Do you get the elbow with the Comp like you do with the EZ?



Bryan

 

[tleclair]

Yes it does come with the elbow at least mine did. I just hooked mine up Friday. Didn't hook up the pump wire but after reading this thread maybe I will. I'll have to use some restraint not to put it in any other levels (1x5) or I know I'll start recking stuff. I also am getting a max Egt of 1100. Hopefully if I hook up the pump wire Egt's will go down and not up. P. S. Just the comp no pump wire connected is impressive by itself.

 

[Gary - K7GLD]

Nick - I think for lowest EGT's, you'll want to get the turbo boost as high as possible - meaning that installation of the boost elbow is probably a good idea...



Bryan, Yes, the Comp does come with the elbow - brings my boost from 20 psi to 32 psi...

 

[Red360]

Gary, I'm glad your steyup works as well as it does. My box arrived today, but I'm waiting for the VP-44 cover plate before I hook everything up.

 

[Sky]

About time you guys hooked up that dam pump wire! Oo.

 

[Steve St.Laurent]

Any time you add fuel to the engine (assuming the same boost numbers) you will raise your EGT's. You absolutely DO NOT want to run a pump wire fueling box without the boost elbow in the case of an HX35 or limiting the wastegate in some manner on the HY35 - your EGT's will go WAY up. More fuel+the same air=more power and WAY higher EGT's. More fuel+way more air can equal lower EGT's. Gary ran on 1x5 and 10 psi more boost. Gary - did you modify the wastegate actuator or elbow when you added the wire? If not then I'm sure that if conditions were the same as you had when you hit the 1100 that your EGT's will be higher. If you ajusted the elbow down or plugged it, etc at the same time then it would make sense that your EGT's went down. I just don't want someone to think that they are going to hook up the pump wire on a PE Comp box or add a fueling box like the blue chip or TST boxes and will see lower EGT's without doing something with the wastegate. Even with doing something with the wastegate if you run on the higher levels of the box you WILL see higher EGT's! With any of the hot boxes out there (pm3, blue chip, PE, etc) and an otherwise stock truck even with the wastegate disabled completely you can easily peg a 1500 degree gauge. JMHO

 

[nickg]

Yes I did get a elbow but cannot use it for my application,I have the hard line going to the wastegate actuator. I did not know which way to go with the turbo mod. there are so many +/- on permanently placing the turnbuckle on. I thought I read that the best thing to do was not to full with it. In the long run it would not hurt to operate it without modifying the wastegate and it would still work to its potential



tleclair how did you hook up your turbo did you go with the turnbuckle or the 22copper shell install as per EDGE? nickg

 

[Gary - K7GLD]

Steve - keep in mind my observations are VERY early in the game... While running the Comp WITHOUT the pump wire connected - and at 1x5 Comp setting - I was seeing 28 psi boost, and a rapid rise in EGT to 1100 at WOT - no smoke visible from the rearview mirror, and that was WITH the boost elbow installed.



After connecting the pump wire - no other changes - plenty of low RPM smoke, boost went to 32 psi and EGT hung at or slightly above 900 -again, at WOT... Of course, different readings are evident at other Comp settings - and this was in no way claimed as a scientific test - only same operating circumstances over the same travel route.



Connecting the wire provided noticeable power improvement over non-wire conditions, and reduced EGT while increasing boost - which SEEMS pretty much in line with what is claimed as reasonable and proper in diesels - more fuel at SAME boost = higher EGT, more fuel with MORE boost = lower EGT - I have no idea what other engine operating parameters may change with the connecting of the pump wire - perhaps MORE than simply fuel alone?



This weekend we'll be pulling the trailer up into the Sierras - I'll have a much better opportunity to do more testing and range adjustments then.

 

[Cummins Cowboy]

gary, have you run the box in 5x5 yet?? Do you think you will have any issue with the clutch?? I just got about the same truck as you last week, used to be a 1st genner like you

 

[Gary - K7GLD]

I've only run the Comp with the truck empty so far, no indication of clutch problems - will be towing the 5er this weekend, and will put the Comp thru it's paces - including 5x5!



If I'm not still walking home by the first of next week, I'll post results...