92 KW 3406 3ZJ issues

Every says 1/4 to 1/2 a hole on flywheel which if you like it to smother out and not run that’s great. If you have an 11 degree cam you want no more than 14.0 at a 1000 start screw at 1260 RPM.

9.5 degree cam you want stay at 12.5 at 1000 start screw at 1260.

I’d turn the screws in 1 turn for sure. The 3ZJ the screws just didn’t make the difference in the seat like the older pumps. You can get the screws out too far and the rack goes past full travel and shuts the scroll port off a bit. That’s usually around 6. Not knowing what’s been done prior I say better safe than sorry. 750 on pyro says you most likely don’t have an air flow problem but……pull the turbo out of exhaust housing and be sure. Do a proper pressure test on the entire charge air side. From turbo housing to head. A leak at your afrc won’t let your rack make full travel. The boost psi means nothing if it has a leak. Takes a big big leak to affect psi. I’m gonna bet it’s going out your air dryer



Everyone you talk to says advanced timing makes it a horse. It doesn’t. I had a kid insisting he wanted his a half hole advanced. I set his Dad’s up and 2 other guys he hails litter with. He called me every day. Bought a turbo then another. I finally got enough and told him just pin time it till i get home. Bout a hour later he calls me back says well you were right I can stay right with the others now. Half hole was 17.5 on meter. Rattled just wouldn’t take fuel. 14 is barely not getting the bolt to start. I’ve been on here a long time. You can look and see my opinions change. They changed each time I dealt myself a hard lesson. I’m sure I have a few more to go

 

No they will not match your pistons. They will make heat and smoke. To run them you need to switch to a 160-1131 piston which is 14.5:1. Do not confuse this with a 7FB piston which is also 14.5:1 but has a completely different bowl and has more meat from the top ring land to top of piston than the 160-1131. The nozzles won’t interchange either as the timing and spray angle for each are different. No where have I ever found flow charts on CAT nozzles. I can find gensets that run the 160-1131 piston with 3425’s as well as 8785. For the most part the rack is at 6.0mm for 580 verses 3 and some change. What I’m saying is just cause the nozzle is rated for more horse doesn’t mean it flows more. Nozzles, pistons, and timing need to match or it’s gonna smoke and be hard to deal with in one form or another. Again another place I used to think some improvement was to be made was 8785 nozzles. They may flow more, but I can’t find any info proving 1 way or another. I’d like to do a few dyno pulls and only change nozzles between say the 3425 and 8785. If your wanting more fuel have yours honed is your best bet. But beware they are only gonna open 1 hole so it’s gonna be hot on 1 side.

 

We have an 89 Pete that come with a 4MG that was absolute #### from day one. Just a lemon. It finally vented the the block in 93. We put a brand new at the time 3ZJ in it. Complete set up. All we used was the A/C compressor and alternator off the other one. That truck is a 15 over with 3.55 rears on tall 24’s. From day one it’s been a hoss. Almost legend around home. Never turned it up etc.
My point is the 3ZJ is in my opinion as good as they get. If it’s right it oughta suit ya. And if you want a monster you have a good base to start from too

 

Several different specs depending on the nozzle itself