1HDT Tuning

[93Siro]

What's up my fellow 80'ers with the wrong engine lol

I just installed had my friend's 1HDT swapped FZJ80 less of a dog by installing a hybrid turbo setup and I/W intercooler. Overall i think the hardware is there and just when i thought i was done with his smokey rig, he trapped me to tune his rig. Now i'm cool with tuning, specially if it involves a standalone and some sort of handheld device or computer but this engine gives me none of that. Last night i rigged up a wideband and plan to hit the dyno by end of the week (just a side question for you guys, since it's a 2WD dyno, will transfer case play cool if i disconnect the front driveshaft and lock the center diff lock?) What is the ideal AFR range for these engines? I already messed with the boost reference screw and got it a whole lot better but still it's too rich i feel.

I would totally appreciate if someone sends me DIY link for tuning the pump. Please don't blast me with "search you a******"

Many thanks

 

[Rock40]

Why can't you do your own search again?

The Official 1HD-T/FT Fuel Pump Mod Tuning Thread

 

[mudgudgeon]

The thread linked above contains all the info you need for tuning. You could start reading at around page 40.

Well worth a read, particularly if you haven't done a lot of diesel tuning. (You don't really say).
There's a lot of trial and error and "feel" goes into it. Bit of a black art until you figure out how all the variables play together.

Boost gauge and EGT gauge can be helpful as well when tuning. I wouldn't rely on AFR only. And I wouldn't rely on a dunno tune only.
After a tune, load the rig up with a heavy trailer, and go and push it hard up some hills.
A safe tune would be one that delivers good power, but doesn't exceed safe EGTs (measured in the manifold, before the turbo) when pushed to the limit.



Removing the front shaft and locking the CDL is 100% ok.

 

[93Siro]

The thread linked above contains all the info you need for tuning. You could start reading at around page 40.

Much appreciated.

Well worth a read, particularly if you haven't done a lot of diesel tuning. (You don't really say).
There's a lot of trial and error and "feel" goes into it. Bit of a black art until you figure out how all the variables play together.

That's what i figured.

Boost gauge and EGT gauge can be helpful as well when tuning. I wouldn't rely on AFR only. And I wouldn't rely on a dunno tune only.
After a tune, load the rig up with a heavy trailer, and go and push it hard up some hills.

It's currently running 15 psi of boost.

Removing the front shaft and locking the CDL is 100% ok.

Thank you very much for your help