Mort's 76 FJ55

Joined
Mar 23, 2007
Messages
782
Location
Moab Utah
 
 
My other question is could the fuel screw be too far out? I haven't touched it so it's where the rebuilder put it.
 
Joined
Mar 23, 2007
Messages
782
Location
Moab Utah
 
 
I got to messing with the fuel screw to see if I could get rid of the smoke. I turned it counter clockwise 2 turns and it wouldn't start. I went back to 1 and it ran but rough. Then 1/2 turn was still a little rough so I put it back to where I started. I guess my next step is to get some injectors.
 
Joined
Jun 12, 2007
Messages
3,197
Location
Portland OR
 
 
Finished reading through your thread and first off nice build, your rig looks beautiful. For my preference I'd want decent all around bumper/slider protection living out in Moab with all those tempting trails nearby, unless you've got some other rig for trail duty than this one can stay clean. I missed what gear ratio is in your diffs?

As for smoke I'll echo what I shared in my PM. The 5x.014s are too big and likely your biggest culprit to all the smoke. The other reason it may seem more smokey now is probably due to the elevation difference from where you were to where you are now. When I ran a set of 5x.014s I just couldn't get them to clean up enough for my liking. For me a puff of black on hard acceleration to a light haze is acceptable for me. Playing the sizing game I currently play with 5x.012 in both the SAC and VCO tips. Running bigger injectors cleanly (that's relative since there will always be a haze with the older mechanical diesels and that's normal) is about tuning and driving style. It means adding throttle as you accelerate and not just smashing it to the floor. I would not run anything bigger for a 4bt driven daily on the street than 5x.012. I echo @J Mack in that the next injector set up would be smaller in the 5x.010 or 5x.011 size range. I've got more full power screw left on my pump to recover some power lost by going to a smaller injector. The smaller hole size would theoretically atomize a little better for a cleaner burn and a little better mileage (again that varies on the right foot).

There are a whole host of different adjustments possible on the VE. The main ones are the ones you are playing with: full power screw, smoke screw, star wheel, timing. I too have found that I can back out the full power screw too far where it won't start and drivability really suffers (becomes a turd). Do you know what kind of fuel pin (brand/model) is in the AFC housing? The fuel pin slope determines how fuel gets added depending on the boost generated. Some fuel too much too soon and that causes black smoke since the turbo can't create boost fast enough to clean up the fuel.

For timing, the best way is to use a dial indicator to get a reading. That's the only way you'll really know where you are at. Once you get a baseline reading on the timing you can accurately adjust as needed. For me, even running higher timing (18 degrees static setting) it would not clean up those bigger injectors.
 
Last edited:
Joined
Mar 23, 2007
Messages
782
Location
Moab Utah
 
 
I'm running 4:10 gears but when I get home from work next time I have 3:73s waiting to go in. Plus I'm thinking about doing the over and under gears for the transfer case which will get me 8% overdrive I think.
I think it's the original fuel pin but turned to the side with the bigger slope.
I'll have to get a dial Indicator and see where the timing is. I'm not sure I'll be able to get one in town so it may be a while before I can get one.

Thanks for the advice. I'll start with timing as soon as I can get the dial indicator and injectors and that sounds like it'll clean up my smoke problem.
 
Joined
Sep 17, 2013
Messages
3,329
Location
Boise Idaho
 
I'm running 4:10 gears but when I get home from work next time I have 3:73s waiting to go in. Plus I'm thinking about doing the over and under gears for the transfer case which will get me 8% overdrive I think.
FYI I'm running the "over/under" gears 8%/44% with 4:10 gears and I feel they are about right with my 35" tires.
 
Joined
Mar 23, 2007
Messages
782
Location
Moab Utah
 
 
FYI I'm running the "over/under" gears 8%/44% with 4:10 gears and I feel they are about right with my 35" tires.
Interesting. I knew you ran the over/under gear but couldn't find what gear ratio you were running in your axles. I'm running 34" tire which looks like a 3% difference from the 35" tires. I'll leave the axles alone then and do the transfer case gears first.
 

GLTHFJ60

Rum Runnin'
SILVER Star
Joined
Apr 18, 2005
Messages
25,878
Location
Durham, NC
 
 
 
The injectors are far too large my man. I've got stock injectors in my engine with a Super HX30w and I can get it to smoke. I am not convinced you would gain power over the stock injectors with a single turbo such as the Super HX30w.

Go ahead and verify your timing, but order a set of injectors. I'd recommend starting with 5x.010s, but ideally get a set of stock injectors.
 
Joined
Mar 23, 2007
Messages
782
Location
Moab Utah
 
 
I'm about to head out of town on Tuesday for work for a couple months, unfortunately. I tried to see if I could get injectors before then but the places I checked were at least a week out before shipping. I'll have to order the injectors and a magnetic dial indicator while I'm gone and get the timing figured out and injectors when I get back home.
When you say stock injectors do you mean Bosch I injectors or the stock size?
 
Joined
Sep 17, 2013
Messages
3,329
Location
Boise Idaho
 
I tried to see if I could get injectors before then but the places I checked were at least a week out before shipping.
You have several good injector shops in Utah have them change your nozzles while you’re out of town and pick them up when you return.
 
Joined
Mar 23, 2007
Messages
782
Location
Moab Utah
 
 
I got the injectors shipped off and started working on the interior a little more.
My handles are in good shape but kind of faded. What have you guys done to clean them up or is there a good alternative out there?

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