Injection pump tuning question

[SteveOWorldwide]

I’m sorry to ask this question that’s been asked a million times but I’ve used the search function and I think at this point I just have information overload. First I will cover my mods. It’s a 1991 80 series with the 1HDT engine with 175,000 kms. I have recently installed a G turbo G333 titan, upgraded down pipe and it’s getting a 3 inch exhaust, PDI front mount intercooler, custom 4 inch intake pipe and filter. I have yet to touch the fuel pump. I’ve been through the big fuel pump thread but it’s too much for me. I need a more compressed “instruction manual” to tune the pump. I did just order the tillix #2 fuel pin and heavy duty spring since I’m planning on running 24psi. While that’s being shipped I’ll finishing installing my EGT, AFR, and boost gauges. Does a simple tuning thread exist?
Mechanical Diesel Engine Tuning - https://www.tillix.com.au/learn/mechanical-diesel-engine-tuning/#h-standard-non-compensated-pump-fueling-on-a-naturally-aspirated-diesel

That’s the best thing I could find but it’s a Nissan pump.

 

[mudgudgeon]

There's a lot of irrelevant info to add through in that tillix link.

Go back to the fuel pump tuning thread in the diesel section ( I assume this tuning thread is what you are referring to? )
Start reading around page 40.
A few guys shared their experience tuning for the first time starting around page 40.
There's a lot to read, but all the information you could possibly need is in that thread


There's a couple of YouTube links in that thread to videos by an aussie guy who put together a fairly good guide on tuning these.

Or,
Go to the RESOURCES section in the main forum menu. I posted the G-Turbo guide to tuning.

All these are guides only, choose one guide and start tinkering. None of them give a 100% clear or foolproof guide. It will take a bunch of trial and error, and head scratching, but if you persevere, and ask questions in the tuning thread, people will respond.
It will make sense bit by bit as you see the result of your adjustments

 

[mudgudgeon]

https://forum.ih8mud.com/resources/...-pump-and-boost-compensator-tuning-guide.149/

 

[Delta VS]

I’m sorry to ask this question that’s been asked a million times but I’ve used the search function and I think at this point I just have information overload. First I will cover my mods. It’s a 1991 80 series with the 1HDT engine with 175,000 kms. I have recently installed a G turbo G333 titan, upgraded down pipe and it’s getting a 3 inch exhaust, PDI front mount intercooler, custom 4 inch intake pipe and filter. I have yet to touch the fuel pump. I’ve been through the big fuel pump thread but it’s too much for me. I need a more compressed “instruction manual” to tune the pump. I did just order the tillix #2 fuel pin and heavy duty spring since I’m planning on running 24psi. While that’s being shipped I’ll finishing installing my EGT, AFR, and boost gauges. Does a simple tuning thread exist?
Mechanical Diesel Engine Tuning - https://www.tillix.com.au/learn/mechanical-diesel-engine-tuning/#h-standard-non-compensated-pump-fueling-on-a-naturally-aspirated-diesel

That’s the best thing I could find but it’s a Nissan pump.

Since @mudgudgeon's linked info associates Cummins VE, Denso, VW, etc injection pumps, can add that for a Bosch VE pump:

The basic adjustments you have are:
1. smoke screw
2. star wheel
3. timing
4. power screw
(once you get to step 4 you will start over to fine tune things)

For modifications:
A. governor spring
B. allow more movement of the timing pin (fig 3 of page 31 in attached pdf)
C. grinding the fuel pin (but sounds like you purchased a pre-ground one)
(once you get to step B you will start over at step 1 to fine tune things again)

For advanced modifications:
Swap head/rotor, really should have a pump shop to do this so it can be correctly calibrated once done

HIGHLY recommend reading these "theory" documents to understand how the things you are changing effect what is happening. Can answer questions about Bosch VE pumps but they may only be generally applicable to Toyota pumps.

on edit: also, be careful, you can very easily get a "runaway engine" situation when playing with fuel delivery. that is the fastest way to get your pistons out of your block in preparation for an engine rebuild.