Adding Boost Compensator to 1HZ

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PhrogsPhorever

PhrogsPhorever

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So, in a never ending quest to get the best out of my motor, I am thinking of adding a boost compensator to my turboed 1HZ. My current injection pump Does not have the HAC and I don't have enough experience with the pump and other models that ran the BC to know what I need to do in order to add it on. Saw a few threads on adding a BC to a pump that had a altitude compensator on it and have pawed through the FSMs, but am trying to figger out the needs for retrofitting it to a vanilla injection pump.

Thanks:cheers:

Sent from my interwebz doo-dad
 
Here is is, standard 1HZ pump with no HAC. Aside from replacing the governor top plate, I know that there are some plumbing differences, just not sure what they are.

image-302708994.webp

Sent from my interwebz doo-dad

image-302708994.webp
 
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Thanks for the pics, that is similar to what I have seen, just wanted to figure out where all the extra lines go to:grinpimp:

Is it possible to swap the governor cap with the pump still attached to the truck, or do you have to pull it and put it on the bench to do it?

Also, I would guess the rubber line coming off the top is off the intake manifold for boost, no?

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phrogg4evr said:
Thanks for the pics, that is similar to what I have seen, just wanted to figure out where all the extra lines go to:grinpimp: Is it possible to swap the governor cap with the pump still attached to the truck, or do you have to pull it and put it on the bench to do it? Also, I would guess the rubber line coming off the top is off the intake manifold for boost, no? Sent from my interwebz doo-dad
Click to expand...

I did it on the truck. Probably would have been easier but yet again it was far less work. Just really cramped.

I honestly recommend taking the intake manifold off changing those gaskets plus setting your pumps plunger stroke all in one shot. Frees up a ton of room. Yes that hose is from the factory cross pipe.

I made a thread about the issues I ran into. I suggest watching a few people fiddle with cummins pumps on youtube. You'll know what to expect. I also modified the fuel rod slightly as well as the cam plate to get sufficient travel for the rod. Pm me and I can send you some info on to what I exactly did.
 
That thread is very informative, especially for somebody who's not very knowledgeable when it comes to Diesel engines, injection systems and turbo related fuel adjustments and requirements.

I'm installing a boost compensator kit ( OEM # 22540-73100 ) on a turbo'd 1HZ right now.

Georg @ valley hybrids
 
Cool, post up some pics and how it went;) I have one on the way (OEM# 22540-17550) for my turboed 1HZ and may get to it this summer.
 
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PhrogsPhorever said:
Here is is, standard 1HZ pump with no HAC. Aside from replacing the governor top plate, I know that there are some plumbing differences, just not sure what they are.

View attachment 856125

Sent from my interwebz doo-dad

View attachment 856125
Click to expand...
I ordered a boost compensator 22540-17260 OEM GENUINE TOYOTA COMPENSATOR SUB-ASSY . Will it be adirect fit to my 1992 HZ77 injection pump?
 
Tony77 said:
I ordered a boost compensator 22540-17260 OEM GENUINE TOYOTA COMPENSATOR SUB-ASSY . Will it be adirect fit to my 1992 HZ77 injection pump?
Click to expand...

It fitted perfectly, but it does not seem to work, I feel no difference with the boost tube connected or not. My boost is 10 psi. Can somebody help me set it up right?
 
Found (what I think is) the correct EPC schematic … I see the gasket and bolts I need but do I need any other small parts in order to bolt this compensator (22540-17260) onto my injection pump (‘93 HZJ75)?

Injection pump body for Toyota Land Cruiser HDJ81V - Genuine parts

Injection pump body for Toyota Land Cruiser with HDJ81V
toyota.epc-data.com toyota.epc-data.com

Gasket (1): 22774-54270
Bolts (4): 22395-54010

Appreciate any insight! 🙌
 
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