HX35's... How quickly do you build 5lbs boost? - Dodge Cummins Diesel Forum
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post #1 of 18 (permalink) Old 02-13-2019, 11:59 AM Thread Starter
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HX35's... How quickly do you build 5lbs boost?

Please list rpm range, altitude, modifications, etc.

I'm curious to see where I fall at with my tuning abilities and if I should continue tuning or not.

So far, I've stage 2 injectors, bigger fuel pump, adjusted valve lash, tuned afc.
4x4 dually 12v
4" turbo back
She hazes a little no matter
I don't like blowing smoke at all.
I am working on upgrading to an he351 to keep up with my fuel system and so I hopefully blow less smoke.
Thanks.

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post #2 of 18 (permalink) Old 02-13-2019, 12:04 PM
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I first have to ask... What are stage 2 injectors?

Please list hole count, size of holes, and spray angle.
If you dont know any of those parameters then that is the first place to look at for the source of your haze.

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post #3 of 18 (permalink) Old 02-13-2019, 12:20 PM Thread Starter
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Quote:
Originally Posted by hemirunner426 View Post
I first have to ask... What are stage 2 injectors?

Please list hole count, size of holes, and spray angle.
If you dont know any of those parameters then that is the first place to look at for the source of your haze.

Sent from my LG-H932 using Tapatalk
I dont know honestly. The previous owner told me they're aftermarket, bigger injectors. I haven't tore into it yet to determine what brand, hole count, etc. Same goes with the fuel pump.
I do know that it dumps if I turn up preboost
and turn starwheel out.
I also trust the previous owner as far as what parts are in there.

All I want to know is at what rpm range other hx35 owners are building 5lbs.
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post #4 of 18 (permalink) Old 02-13-2019, 12:28 PM Thread Starter
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hemirunner426, does your rig have an hx35 in it? What rpm range are you building 5lbs of boost?
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post #5 of 18 (permalink) Old 02-13-2019, 01:08 PM
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Building 5 psi of boost depends on how fast your going, on a level road, pulling or hauling a load. Driving on level road at 60 with light wind and about 1,700 rpm's I run between 4-5 psi of boost. Not sure of my altitude but i'm pretty much stock except for 4" exhaust and open center muffler, no 8 fuel plate and whatever 40 hp injectors are and auto trans.

The fuel pump has no say in how much your truck smokes, it will only put out the PSI that your OFV will let it.

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post #6 of 18 (permalink) Old 02-13-2019, 01:20 PM
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I want to know what a bigger fuel pump is. If the engine hazes the afc is not tuned.

97 3500, 2 WD, G56, slightly bombed, 1.3 million miles. Started the second million on 8/24/13
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post #7 of 18 (permalink) Old 02-13-2019, 02:03 PM
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Originally Posted by Dallyquad12er View Post
hemirunner426, does your rig have an hx35 in it? What rpm range are you building 5lbs of boost?
I ran an HX35 for a time before switching to a SXE362 at this power level. Overall it was very responsive as you would expect from a small turbo on this engine. There are a ton of factors at play to answer your question with any sort of accuracy... but I can say that on a level surface, empty truck, typical traffic acceleration it would build 5lbs of boost anywhere between 1300-1500rpm.

91.0 D250 A727 w/ 216k on the clock. i/p replaced 20k ago, lift pump 2k, 1 turn fuel, 2 turns smoke, ground & polished AFC pin, timing bump, 366 spring 94 2500 4x4, 49k miles, Farrell Diesel rebuilt 215 pump, PDD 5x12 SAC, SXE 362, built 47RH
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post #8 of 18 (permalink) Old 02-13-2019, 02:35 PM Thread Starter
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Quote:
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Quote:
Originally Posted by Dallyquad12er View Post
hemirunner426, does your rig have an hx35 in it? What rpm range are you building 5lbs of boost?
I ran an HX35 for a time before switching to a SXE362 at this power level. Overall it was very responsive as you would expect from a small turbo on this engine. There are a ton of factors at play to answer your question with any sort of accuracy... but I can say that on a level surface, empty truck, typical traffic acceleration it would build 5lbs of boost anywhere between 1300-1500rpm.
Very helpful thank you
In the same scenario I'd say I'm making 5lbs at around 1800 at a mile above sea level at full throttle 3rd gear.
The previous owner told me he had the largest injectors an hx35 could handle before having to upgrade to a larger turbo. What size injectors that is is beyond me. He said something about stage 2 so thought it was worth mentioning. Whether that's 75hp, 150hp or 40hp, I don't know.
I now know that I can continue playing with my afc with hope for better numbers.
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post #9 of 18 (permalink) Old 02-13-2019, 02:46 PM
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Whether that's 75hp, 150hp or 40hp, I don't know.
Those numbers are meaningless as well. Hole count, size of holes, and spray angle are the numbers you need to know. If you are accelerating in 3rd, WOT and only producing 5 psi of boost you have a problem, no matter if you are in Denver or Houston.

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post #10 of 18 (permalink) Old 02-13-2019, 04:21 PM
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Very helpful thank you
In the same scenario I'd say I'm making 5lbs at around 1800 at a mile above sea level at full throttle 3rd gear.
The previous owner told me he had the largest injectors an hx35 could handle before having to upgrade to a larger turbo. What size injectors that is is beyond me. He said something about stage 2 so thought it was worth mentioning. Whether that's 75hp, 150hp or 40hp, I don't know.
I now know that I can continue playing with my afc with hope for better numbers.
You should find out the hole count, size, and spray angle. It is super important for a good running engine.

DDP usually does the stage nomenclature on their injector. They never indicate size, hole count, or spray angle. As far as I know they are the only one's who don't. Most people choose to stay away from them for this reason.

Anyways, only 5lbs at 1800RPM at full throttle? You have another issue going on there entirely. Most likely the AFC configuration is not correct.

91.0 D250 A727 w/ 216k on the clock. i/p replaced 20k ago, lift pump 2k, 1 turn fuel, 2 turns smoke, ground & polished AFC pin, timing bump, 366 spring 94 2500 4x4, 49k miles, Farrell Diesel rebuilt 215 pump, PDD 5x12 SAC, SXE 362, built 47RH
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post #11 of 18 (permalink) Old 02-13-2019, 04:33 PM
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Full throttle in 3rd I'm at 21psi of boost flat ground empty

97 cummins 4x4 nv4500
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post #12 of 18 (permalink) Old 02-13-2019, 07:26 PM
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Sac nozzles are usually hazy at idle. Pull one of them out and find someone that can give you an idea what your running.

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