Engine/Transmission (1994 - 1998) need a diesel dynamics kit expert

[LVJUNIOR]

I purchased a 98 4X4 auto used. It has an upgraded turbo, Stage II injectors and "a pump kit" I am told the turbo is an hx40 and that the " pump kit" was a fuel plate. I have the 180 pump. Does any one know what plate was used in this kit. I can barely rev to 3000rpm, the truck builds a lot of heat, boost takes forever to come in and when it does it only runs to about 25psi unless you get into it really hard and at will get up to about 30psi. I have checked for boost leaks and it seams tight. I have 4" exhaust with an ats manifold and a cold air intake system. The star wheel is turned all the way to the smoky side and it will only puff off of the line. With this set up and the star wheel turned all the way up it shoul billow smoke (not my goal) I feel like there is a lot of power being left on the table some where I just dont know enough to find it. Any Ideas where to start would be greatly appriciated

 

[KLockliear]

As with any 12v, there are a ton of variables. First, does the cam plate say Diesel Dynamics on the top? If so, #2 or #5 - there were two different ones. Hopefully you have a #2.



Assuming the pump is working fine, try clamping off the hose going to the back of the aneroid and see if that makes any change to the power/performance - if not, the aneroid isn't working. Could be a leak in the line, hole in the aneroid diaphragm, etc.



If the truck didn't have a governor spring kit installed, it won't make power above about 2600-2700rpm. It might turn 3k, but won't make much power up there. Also, an HX-40 on a 180hp truck with only a cam plate and Stage 2's is a bit on the big side. I'd guess the truck should make in the 280-300hp range, and that turbo really doesn't start to work until around 400hp. The stock HX-35 or maybe a 35/40 hybrid would be a better fit at that power level.

 

[Cummins Thunder]

Timing sliped?

 

[Dave M]

My 97 5spd has a 215 HP pump. I would have thought the 98 would have 215 Hp to. Is it a 180 pump because it's an auto?



I believe my truck (I bought 5 years ago) is stock except for the 4 in exhaust and AFE Stage 1 air filter that I added. I have not had the AFC off to see if it's been modified. I get up to 28 psi and close to 3K RPM's but the power seems to fall after around 2700 RPM's.



I haven't added the #10 plate or 3K GSK that are on the shelf patiently waiting to be installed. I'm waiting to get the timing tools so I can bump timg to 16 degrees.

 

[KLockliear]

Yes, auto=180hp, manual=215hp

 

[LVJUNIOR]

klockliear I am going to have to plead ignorance here. Does the aneroid line go to the afc housing? I know I have to take the cover off of the AFC housing to check the plate (never done this is it as simple as removing 4 screws and reinstaling them) but is the number on top of the plate or do I have to remove it.



As to the timing slip, I had the timming set a couple of months ago at J&S diesel so I think it should still be good.



I realize that the hx40 is too much turbo for this truck because it is laggy as heck but that is what they sold him when he bought the injectors and plate kit and I can't afford a good turbo. is there anything I can do to make this turbo wake up faster?

 

[KLockliear]

Yes, the back part of the AFC housing is the aneroid. There is a square part with 4 screws that secures the aneroid diaphragm. There will be a line coming off the very back that goes to the manifold - that's the AFC boost reference line. Clamp that off (or unplug it and plug it up) and run the truck and see if there is a difference in power. If the aneroid is working now, the power will go down. If it's not working, there will be no difference.



If you're not planning on more power for the truck, consider finding someone who wants an HX-40 sized turbo and swap their HX-35 + cash for yours. You'll never be happy with that turbo and the power you have.



See the kit instructions below. The pictures/diagrams may be helpful to you.



DD Cam Plate Install Instructions

 

[LVJUNIOR]

Thanks for the help I am going to try to get to the aneroid line before the weekend.

 

[LVJUNIOR]

How do I verify what kind of turbo it is? I can not find hx anything on it. It says holset and on the compressor outlet there is a brass plate with a string of numbers with no letters I think it says 100525245 and appears to be hand stamped

 

[KLockliear]

Easiest thing to look at is where the downpipe connects to the turbo. Is it 3" or 4"? The stock outlet is 3", and has an elbow that turns down like 30-40*, then the downpipe connects with a 2-bolt flange. An HX40 will have a 4" downpipe that connects right at the back of the turbo with a v-band clamp.