DAP 50hp injectors, SAC or VCO?

[NIsaacs]

Any 1st gen. guys left around here, Lol

Looking to replace my 20 year old 50hp Bully Dogs. Getting the blue/rich idle haze, plus they have always been smoky. I understand I need the 145* spray pattern for my '91.5 intercooled truck.

Looking at these with new Bosch bodies:

https://www.dieselautopower.com/dap-brand-new-performance-injector-5x0-012-vco-145-up-to-50hp-15293

https://www.dieselautopower.com/dap-brand-new-performance-injector-5x0-012-sac-145-up-to-50hp-15297

I would like to stay in the 50 hp range, it seems to do really well at this level. I have no EGT's or coolant issues at all, just too much smoke. I have a rebuild kit on order for my '01 HX35W, it is going on also. It dyno's 260hp/700tq now.

 

[NIsaacs]

DAP recommended the VCO, so that is what I ordered.

https://www.dieselautopower.com/dap-brand-new-performance-injector-5x0-012-vco-145-up-to-50hp-15293

 

[NIsaacs]

Rebuilt the HX35 and installed it in the '91. It was a direct bolt in. I did need to move the exhaust pipe/brake back 1 inch, the '91 exhaust manifold had studs to mount the turbo. The HX35 had two studs, so I removed them and 2 from the '91 manifold and used smaller bolts clear through, threads and all. The oil lines were exact as was the compressor outlet. The shaft was worn slightly so it didn't tighten up as much as I would have liked.

Shake down run with empty truck to town and back, it spools quicker but max boost was the same, 26psi. The big oem air filter housing muffles the intake so no cool intake spool up whine. The exhaust might have a slightly louder idle whistle.

 

[NIsaacs]

Wow, nice bump in power with the new injectors. I didn't expect that. Boost jumps to 28 psi now, still can get some smoke but it is grey now and not soot black. Idle is haze free.

Old injectors have Brasil KDAL 59p5 18208, 245 bar on the bodies and 4 hole nozzles. The new ones had really thin washers v/s old, they were thick. I would say about .010 v/s .030

After some research, the old injectors might be 4x13, 155* spray pattern and rated 50hp P-pump or 30hp VE pump. That might explain the bump in power and the smoke they had.

 

[SRay]

If I remember right, Sir Robert’s (RSchwarzli) 1990 daily pulled 285 hp, 720 tq with his factory turbo and injectors years ago. His injection pump was adjusted for the first time that day. Stock power was 190 with 460 at the wheels I believe. (Supposed to be 160 flywheel with 400 torque)

The HX35 is a decent turbo that’s faster spooling than the gen1 turbos. I have personally tried several gen1 exhaust housings on my 1997 P-7100 12 valve to see what spooling and egt’s looked like. I even tried the Lag Master with the 50 hp injectors and 60 mm compressor wheel. Very short power band and high egt’s

I still find the HX35 to be a good turbo with the 60mm wheel, 12 cm exhaust housing. 550,000 km on the original turbo. 400 hp at the wheels.

I used the DDP 50 hp injectors.