Man, it's looking good and I'm excited for you. I foresee you eventually relocating that oil filter 
. Welcome to the 60+psi club.
. Welcome to the 60+psi club.
Builds Moonshine - A Build Thread (8 Viewers)
- Thread starter GLTHFJ60
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I use a cobra head styled 90 to get a more compact 90 degree turn for my intake on the big turbo. It is tight but it does fit.
I like how the metal cobra head 90 you made for the big to small connection turned out. What are the plans for the outlet on the small to the intercooler? That's the boot I kept blowing up and where I eventually went to a v-band style connection.
I like how the metal cobra head 90 you made for the big to small connection turned out. What are the plans for the outlet on the small to the intercooler? That's the boot I kept blowing up and where I eventually went to a v-band style connection.
- Thread starter
- #4,163
I bought a cobra head but with how close the bottom outlet and top turbo are to the bottom turbo intake, the cobra head can only point straight out the side, which isn't ideal because it's pointing straight at my shock tower. There is some space for a 90* up, but not much. If my elbow plan doesn't work out I'll have to go that route.
For small to intercooler I just have boots. It's pictured in my last post. We'll see if it holds.
I see the last pic now on your last post. With the elbow being metal you will probably be ok. That double compressed air gets hot and was pretty much slicing through my silicone 90 degree elbows so having metal there already should keep you safe. Does your metal small to intercooler pipe have beads on them for those couplers to fasten against?
- Thread starter
- #4,165
Yup, everything has beads. Only point of concern is that the turbo outlet to intercooler isn't a straight shot, so the tube isn't sitting square in the couplers. The bead is behind the clamp with plenty of boot, but it's still not ideal. We'll see how it goes. I can fabricate a s-section intercooler pipe if I need to later.
- Thread starter
- #4,166
- Thread starter
- #4,167
Disappointing first drive. Secondary turbo isn't lighting at all. 25-27psi max off of (I assume) the primary turbo.
Secondary turbo drain is pissing oil too.
Not sure if the injectors aren't big enough to light the secondary, or if the slight exhaust leak at the back of the primary is enough, but *sigh*.
Took it apart this morning to adjust the secondary wastegate one turn off of full tight, but it didn't help.
She looks good though, and she drives as well as she did before, so at least I didn't lose any ground.
Secondary turbo drain is pissing oil too.
Not sure if the injectors aren't big enough to light the secondary, or if the slight exhaust leak at the back of the primary is enough, but *sigh*.
Took it apart this morning to adjust the secondary wastegate one turn off of full tight, but it didn't help.
She looks good though, and she drives as well as she did before, so at least I didn't lose any ground.
- Thread starter
- #4,168
Wondering if the injectors aren't big enough to light the big turbo. I still have stock injectors.
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How much do you have your pump turned up? New fuel pin? Stock fuel pump?
I'm sure its in your build before but I forgot.
Also are what are your exhaust housing sizes? 8&9?
I'm sure its in your build before but I forgot.
Also are what are your exhaust housing sizes? 8&9?
- Thread starter
- #4,170
Half turn from runaway. Denny t stage 2 pin. 6cm high pressure 9cm atmospheric.
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Do you have fuel coming back from your return line when running/making boost? or is it all getting sent into the cylinders?
If no fuel, you might just need to upgrade your fuel pump to a LPHV pump. If there is fuel, you probably need to increase the injector size.
If no fuel, you might just need to upgrade your fuel pump to a LPHV pump. If there is fuel, you probably need to increase the injector size.
- Thread starter
- #4,172
It's already a low pressure piston pump, maintaining 15psi (at the head) all the time.
How would you suggest verifying that the return circuit has fuel while under boost?
How would you suggest verifying that the return circuit has fuel while under boost?
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Since you have the pump already then the next step would be injectors. some 5x12s would probably be good for your 350-400 HP goal, I got some from 4btparts.com (used to be Dieseltuff) nice guy with good prices.
- Thread starter
- #4,174
Cool, thanks. Glad I'm thinking in the right direction.
- Thread starter
- #4,175
I love reading old forum posts.
Back in '15 @boots4 was working through injector selections. He found a 155* 5x012 vco injector for a first gen non-ic ve pumped 12v called a marine 370. I'm glad I remembered that discussion happening. I believe I've got the 155* pistons as well.
forum.ih8mud.com
Looks like I just found those injectors for a good price here:
Seems like that's the logical next step after I get some more gauges set up somehow.
Back in '15 @boots4 was working through injector selections. He found a 155* 5x012 vco injector for a first gen non-ic ve pumped 12v called a marine 370. I'm glad I remembered that discussion happening. I believe I've got the 155* pistons as well.
Builds - Family haulin'
Thanks for the response. My tendency to tinker has been spread out over several vehicles. I am realizing how much time it takes to do things while being a Family guy/ Dad/ Husband/ employee etc. Sometimes things are sacrificed that shouldn't be in my situation. Keep up the good work. I have a...
forum.ih8mud.com
Looks like I just found those injectors for a good price here:
89-93 Dodge 5.9L Dodge 12V VE Cummins DFI VCO 5x.012 Injectors
Ducky Fuel Injection DFI 89-93 5.9L 12V Cummins VCO 5x.012 Injectors
puredieselpower.com
Seems like that's the logical next step after I get some more gauges set up somehow.
Mine was able to get me 60psi with stock injectors. I only recently added larger marine ones. I also had a roughly 10 psi difference between the gauges on the overall boost and the large turbo.
I'm leaning towards a leak somewhere.
- Thread starter
- #4,177
Yours is an intercooled engine (originally) right? The "stock" injector size grew with the power rating. Mine are 4x.013 injectors, pretty small.
I think mine was intercooled originally. Hopefully it is a simple as needing larger injectors.
Even with your injector size you should be able to light both turbos with your fuel settings and get more boost than what you are seeing. You mentioned gauges, what gauges do you have right now and where are they hooked up? I think we should troubleshoot your current set up before adding in injectors.
Tuning... here we go, expect this to take plenty of trial and error and some time. Standard practice of doing one adjustment at a time to gain understanding on what each adjustment does in your set up. Ultimately one adjustment can impact another but this just takes time to get you data and feel the changes and usually means a test drive each time.
I would try to loosen the wastegate tension on your small turbo a turn at a time to see if you get results. This will help feed the big turbo more exhaust to get it to spool up.
I too agree with checking for boost leaks from big outlet to small, to intercooler to intake, etc. Did your vband deal come with an oring groove?
Tuning... here we go, expect this to take plenty of trial and error and some time. Standard practice of doing one adjustment at a time to gain understanding on what each adjustment does in your set up. Ultimately one adjustment can impact another but this just takes time to get you data and feel the changes and usually means a test drive each time.
I would try to loosen the wastegate tension on your small turbo a turn at a time to see if you get results. This will help feed the big turbo more exhaust to get it to spool up.
I too agree with checking for boost leaks from big outlet to small, to intercooler to intake, etc. Did your vband deal come with an oring groove?
- Thread starter
- #4,180
Two gauges right now, pyro in the exhaust manifold and boost on the manifold. Also have fuel pressure, but that's not really related. Plan is definitely to install some more monitoring equipment to see what's going on, just mulling over what exactly to add, and how nuts to go with it. Have spent too much money so far to just throw more money at it
Current thinking is an intermediate charge pipe boost reference, a manifold drive pressure reference, and a hot pipe pyrometer. Would also like a drive pressure reference on the hot pipe. @Zjohnsonua wants more sensors though
The vband on front of the high pressure turbo housing, that holds the intermediate charge pipe, has a sealing gasket, yes. The vband on the high pressure turbo compressor outlet also has a sealing o-ring. I'll check for boost leaks after I retorque the head again and check the valves again. I did order a gasket for the primary to hot-pipe connection, although there was no gasket on either of the HX30 turbos out of the box.
Fully expected to have to tune this for a while, I just expected to come out of the gate with a little more oomph
Current thinking is an intermediate charge pipe boost reference, a manifold drive pressure reference, and a hot pipe pyrometer. Would also like a drive pressure reference on the hot pipe. @Zjohnsonua wants more sensors though
The vband on front of the high pressure turbo housing, that holds the intermediate charge pipe, has a sealing gasket, yes. The vband on the high pressure turbo compressor outlet also has a sealing o-ring. I'll check for boost leaks after I retorque the head again and check the valves again. I did order a gasket for the primary to hot-pipe connection, although there was no gasket on either of the HX30 turbos out of the box.
Fully expected to have to tune this for a while, I just expected to come out of the gate with a little more oomph
