Engine/Transmission (1998.5 - 2002) New 275RVs and new VP44...still a dog??

[SnoKing]

Also look under the dash at the top of the go pedal and then lift the pedal and see how much slack is in the cable. Split shot fishing weights on the cable will work to take the slack out of the cable.



I found this on may truck from post here and the fact that the CC had more power on the hills towing than my right foot. SNOKING

 

[steved]

I ordered a MAP ($53) and IAT ($46)... I think those prices are right as I don't have the paper in front of me. I'll post part numbers when I get them tomorrow.



I got a suggestion to remap the APPS voltage. Plus check for boost leaks... and the slack.



I got a lot of stuff tro check!

 

[2-ND TIME]

Rv-275's and new vp44

If your Dodge dealer has, still has the parts have them turn there DRB scanner into the osocilloscope. What this will do is be able to look at the voltage at the PDC and the harness to the vp44 you might have a bad voltage there?

 

[Huff N Puff]

Sounds to me like:

Granted my truck has almost 100 more HP, but this 99 of my folks is still doggish. Replacing the VP44 and the injectors helped some (mainly at high RPMs), but it still seems lacking. It doesn't smoke under WOT... not even a little, like its not getting enough fuel.



What sensors control the fuel delivery??? A 24-valve is not my strong point, sorta remember an IAT and maybe a mass air flow or manifold absolute pressure??? None of this has been touched in 270k...



The fuel filter and air filter have around 6k miles on them, and this condition predates both of them... lift pump is good, and pushing at least 7psi (we have a light) at WOT.



The turbo sounds healthy, just acts like its not getting enough fuel. The VP44 and injectors made a huge difference in the idle (not smoking now) and high RPM driving, but anything around 1500 RPM is pathetic (unloaded, it will lose ground in 5th pulling any moderate grade... it should be able to gain easily)



What am I missing??? What should I be looking for??

Your Turbo is spooling slow,could have a drag on it. You need to hookup a pressure guage to monitor both fuel pressure and boost,to help you solve this issue.

 

[slomodiesel]

Steved- have you considered a FASS style lift pump? I put one on mine and it starts at least 2 seconds faster, has 17 lbs pressure most of the time, and maybe the best part- you can drain water out of the filter that invariably gets in your tank somehow. I just drove to Houston and back (2200miles) round trip and had to drain water twice as engine died. Water in fuel is a major deal and a FASS style pump really helps, and will supply the fuel your new injectors and pump need. Good luck and hope this helps.

 

[slomodiesel]

Also - my cruise quit for over a year until I pressed really hard out of frustration on the stop button near the right thumb on the steering wheel and it starting working great now and has for over 2 years!?!

 

[steved]

Your Turbo is spooling slow,could have a drag on it. You need to hookup a pressure guage to monitor both fuel pressure and boost,to help you solve this issue.

I physically checked the turbo... no end play and spins quite free... we have a low pressure light, that's more than enough in this case...

If it was turbo not spooling, then it should smoke worse... if I'm thinking correctly.

 

[steved]

Steved- have you considered a FASS style lift pump? I put one on mine and it starts at least 2 seconds faster, has 17 lbs pressure most of the time, and maybe the best part- you can drain water out of the filter that invariably gets in your tank somehow. I just drove to Houston and back (2200miles) round trip and had to drain water twice as engine died. Water in fuel is a major deal and a FASS style pump really helps, and will supply the fuel your new injectors and pump need. Good luck and hope this helps.

Fuel supply to the VP44 is not the problem, we've already addressed this. The lift pump is almost new and working fine.

 

[2-ND TIME]

New 275's and still

That is interesting because I changed my fuel filter after ahhhh 145,+++ km's and there was no water in the filter and there was only ( What I have learned a few days ago is ) asphalteen's on the filter. A number of grains of sand and that was it. That isn't bad with 90,000 miles on the filter, buy clean fuel and your not likely to have problems. Do get your voltage checked by a scope or the DRB. Bad voltage will ruin the computors ability to think or calculate! Good luck.

 

[steved]

That is interesting because I changed my fuel filter after ahhhh 145,+++ km's and there was no water in the filter and there was only ( What I have learned a few days ago is ) asphalteen's on the filter. A number of grains of sand and that was it. That isn't bad with 90,000 miles on the filter, buy clean fuel and your not likely to have problems. Do get your voltage checked by a scope or the DRB. Bad voltage will ruin the computors ability to think or calculate! Good luck.

We're going to check the APPS ourselves... there's a write-up on checking the voltage and adjusting it...

 

[steved]

That is interesting because I changed my fuel filter after ahhhh 145,+++ km's and there was no water in the filter and there was only ( What I have learned a few days ago is ) asphalteen's on the filter. A number of grains of sand and that was it. That isn't bad with 90,000 miles on the filter, buy clean fuel and your not likely to have problems. Do get your voltage checked by a scope or the DRB. Bad voltage will ruin the computors ability to think or calculate! Good luck.

oh, and the water thing... pump water with fuel and it emulsifies, and it passes right through the filter media (water blocking or not!)... I drove 200k on my 99 and never saw a drop of water.



I installed a FASS on this 04. 5 of mine and drain several tablespoons of water out of every tank... the FASS runs the fuel/water through a water separator prior to hitting a pump.

 

[klaybus]

FYI-275s won't over boost. My lil bro has been running them for over a year pulling his 5vr. Good luck.



Clay

 

[JR2]

steved - Any update on your problem??

 

[Bob4x4]

FYI-275s won't over boost. My lil bro has been running them for over a year pulling his 5vr. Good luck.



Clay

That holds true in most cases,but I upgraded a fleet of very heavy 3500's

utility bed trucks with welders etc. on the grapevine at times they would set overboost and occaisionally derate if it was pushed hard enough after the light tripped. In all fairness the also had AFE air kits and exhaust so they did flow and run good

Add in the Edge EZ and of course no more overboost but the drivers would push the trucks so hard they would get the derate due to high coolant temps.

After doing a lil educating the drivers, all was good and they still flew up the grapevine



Bob

 

[VHolloway]

put a fass pump on it we get 20psi at idle and 17 and 18 on the road

it will help pep it upOo.

 

[Chief USA]

Granted my truck has almost 100 more HP, but this 99 of my folks is still doggish. Replacing the VP44 and the injectors helped some (mainly at high RPMs), but it still seems lacking. It doesn't smoke under WOT... not even a little, like its not getting enough fuel.



What sensors control the fuel delivery??? A 24-valve is not my strong point, sorta remember an IAT and maybe a mass air flow or manifold absolute pressure??? None of this has been touched in 270k...



The fuel filter and air filter have around 6k miles on them, and this condition predates both of them... lift pump is good, and pushing at least 7psi (we have a light) at WOT.



The turbo sounds healthy, just acts like its not getting enough fuel. The VP44 and injectors made a huge difference in the idle (not smoking now) and high RPM driving, but anything around 1500 RPM is pathetic (unloaded, it will lose ground in 5th pulling any moderate grade... it should be able to gain easily)



What am I missing??? What should I be looking for??

Steve,



As already mentioned, you need to install a boost elbow on the turbo charger to prevent it from dumping boost over 20 psi.



Secondly, try installing a boost fooler. This plugs into the harness at the MAP sensor and prevents the computer from sensing an over boost condition.



Dodge Turbo Boost Fooler 98-00 Round Map



or for auto trans. :



Turbo Boost Control Kit - 98. 5-02 Dodge 24V



Thirdly, install a BHAF with heat shield and Outterware pre-filter.



These 3 combined should allow your engine to benefit from the 275's minus the eventual installation of a 4 inch exhaust.



As already mentioned the Edge EZ will add extra fueling and timing as well as boost fooling. The Edge EZ will dump on the power much more radically as compared to just the 275's and the boost fooler. The Edge EZ comes with a boost elbow and if you buy a used Edge EZ, call Edge and they will send you a boost elbow free.



Be sure to check and clean ALL of the connector plugs and check the pins to be sure they are straight and undamaged.



I have run my truck with the injectors and the boost fooler and also with the Edge. With just the injectors and the boost fooler the increase in power was noticable but came on smoothly.



With the Edge EZ added the power delivery was much more sudden and fueling as well as boost started at a much lower rpm. The Edge made about 6 psi more boost than with just the injectors and boost fooler.

 

[steved]

I got the parts, just haven't had time to install...



The track seems to be continually learning the newer injectors and pump... the more they drive it, the better it runs.



I'm trying to stay away from anything aftermarket... and the point of this thread was the fact the truck was gutless BEFORE the new injectors and VP44 (which most agreed was probably injector related), so this is a pre-existing condition that affected power before the injectors and pump were installed.