Chrisf

What I am thinking of doing is just installing some stage 2 or 3 injectors.... what would be the down side to this, everything on my truck is mostly stock. I was think that just new injectors would be a lot less stressfull on the VP-44 that a Edge box? .... any input?

Chris

j-fox

I've often thought that injectors was the place to start. But, you will get into max boost issues- it may go to max so fast it still sets a code. Any one else have feed-back? And then you may have heat issues.<br>D you have gauges?

rich

The order it was told to me was box then injectors. the edge adds fuel and a timing advancement. the injectors allow more fuel but only what is allowed from the stock fueling system . i believe its the lift pump that can hurt vp-44 not the boxes in my opinion.

Ruralmedic

Well, you've got a '98.5. From the posts I've read over time, it appears the early ISB's have a high failure rate of the VP44 when an aftermarket fueling box is added. Some have gone south in a matter of minutes when these were hooked up. That's what scares me about getting one, as I have a '98.5 as well.

Racer57

When you say &quot;Edge&quot; box, are you referring to the EZ or the Comp which taps, or can tap the pump wire? I wouldn't worry bout the EZ but with a 98.5, but I would worry bout tapping the pump wire with a Comp. EZ and DD2's are a fantastic package for the 24 valves if you address the drivetrain issues that are sure to arise. I see that you have already gone thru at least one VP44. The later VP44's seem to hold up better to tapping the wire. In any event, you roll the dice. My buddy lost his VP44 on a 2001.5, is replacing the pump and is gonna tap the wire again.

Chrisf

ya i am on my second VP-44 and I think going on a Third soon, thats why I was thinking Injectiors would be my route... I am not sure if the rebuilt ones are and better than the original 98.5 ones?

Racer57

Don't know the answer about the rebuilt verses new. Call Scott at J&amp;S Diesel in Las Vegas and ask him. He would know for sure.

cfar

Supposedly the early 98.5 vp44's had some internal clearance issues, if you bought a new or rebuilt one it should have the latest updates.<br><br>I put in III's without the elbow and had no problems with overboost. No boost fooler either.

DavidTD

[quote author=Chrisf link=board=7;threadid=16216;start=0#152274 date=1056338573]<br>ya i am on my second VP-44 and I think going on a Third soon, thats why I was thinking Injectiors would be my route... I am not sure if the rebuilt ones are and better than the original 98.5 ones?<br>[/quote]<br><br>Chris - how many miles are on your truck?<br><br>

Chrisf

138,000 replaced the VP44 &amp; lift pump at about 98,000. I think my new VP44 is also going out... its giving me a code 216 about once a week : I just replaced the lift pump again ( was droping down to around 5 psi wot ) Now it never gets below 10 psi, I haven't had the code yet but It only been about a week

Push Rod

Ack, I think I'd find out why you're going through so many VP44s before I thought about performance mods. The VP44 isn't as stone cold reliable as the P-pumps, but its also not a bad little critter either. Generally, VP44 failures can be linked directly back to lift pumps and poor fuel systems. Before you do anything like injectors or a box, I'd look after the fuel system integrity and also start running some fuel additive. You may have some poor diesel in your neck of the woods thats causing you undue grief.<br><br>On the wire tap causing injection pump failure, this is indeed an issue that you need to be aware of, however its also not as common as you'll read on the 'net. I've sold literally hundreds of wire tap boxes, and had 2 VP44 failures (1 98.5 and 1 2001). Its an issue, but in our case, its only been an issue less than .3% of the time.<br><br>Rod

Agades

I replaced a VP and didnt need to<br>now that really sucks<br>

DavidTD

I agree with Rod. My 98.5 has 149k on it. VP44 was replaced at 80k. Also replaced lift pump. My second one was doing fine when I parked it tonight. Tomorrow may be different you never know. <br><br>I'd have to look at a few more things that can lead to pump failures. Also don't forget, there can be mechanical and electronic failures with the VP44. Mechanical failures would be more related to the boxes than electronic.

Chrisf

What about adding just the Bosch RV275 injectors, I am not sure but will that give me 275 hp total and not add 275 Right??? (Dumb Question) all the other aftermarket Injectors are rated in how much they add and not what they produce over all ... seems like that would be a good start untell I upgrade my auto and the go for a box latter maybe???

Chrisf

[quote author=DavidTD link=board=7;threadid=16216;start=0#152604 date=1056421588]<br>I agree with Rod. My 98.5 has 149k on it. VP44 was replaced at 80k. Also replaced lift pump. My second one was doing fine when I parked it tonight. Tomorrow may be different you never know. <br><br>I'd have to look at a few more things that can lead to pump failures. Also don't forget, there can be mechanical and electronic failures with the VP44. Mechanical failures would be more related to the boxes than electronic.<br>[/quote]<br><br><br>ya my first one when out because of a bad lift pump : and the second is much of the same I think... you think I would have learned... Am installing guages soon