Engine/Transmission (1994 - 1998) help, lots of mods, still lazy

[DHixson]

OK so I dropped a 98 12V w/ 180Hp pump in my Ford n put a NV4500 behind it. Did a turbo, exhaust, fuel plate, FASS, injectors, 7. 3L IC, and when I shift it will not pick up any speed without boost. It isn't very impressive on power either. I have virtually no smoke. I didn't go crazy on any single mods, everything is balanced pretty well. I had to do a little custom routing on the return line and I am wondering if maybe this could be where my problem is? I put a T in to connect the injector return line with the injection pump return line and then another T to connect the FASS return to the engine return. I pinched the line with vice grips to see if that would get me the fuel I need in the cylinders but didn't gain anything, including smoke. So now I am wondering if my injection pump might not be letting enough fuel through. A lot 2 read but any help is appreciated.

 

[Forrest Nearing]

check your overflow valve, what injectors? what plate? have you loosened up the AFC?

 

[The patriot]

Check all connections, like Forrest said.

Then I'd be thinking the lever in the pump. It sometimes goes under the cam plate.

 

[Forrest Nearing]

also, did you mess with the throttle linkage at any point?

 

[JDKammin]

I am not running a Fass system on my truck, but have similar setup to put on farm tractor with 855 Cummins. I was thinking that instructions mentioned to run return back to tank and do not tee into any existing return line.

 

[GDMRTN]

Sounds like a stock setting afc. Loosen it and see what happens.

 

[DHixson]

This is my first Cummins n I'm learning as I go, so I am a little dumb on them yet.



Forrest, when you say over overflow valve I assume you mean the banjo bolt on the return from the injection pump. If so I checked it and it works fine. My mods are HX-40, DDP3's, Piers adjustable plate set at #10, and I have not messed with the AFC. I actually don't know anything about it yet. I double check the throttle, it's set good.



I will get back to you on the pump lever and the FASS return.



Thanks for the help... ... ...

 

[Forrest Nearing]

you need to loosen up the AFC big time... stock AFC setting with an HX40 is going to be sluggish, even with the DDP3's!



you're gonna be in for a surprise when you loosen that baby up a little

 

[DHixson]

WOW! I got in there and cranked the star wheel and boom, instant power! I can't get through the gears fast enough now. Thanks again for the help

 

[tp0d]

Watch that HX40 though. Do not bark the turbo while shifting, or your turbo will go *boom* literally.

Glad to hear the AFC did it for ya, suprising the stock setting wasnt enough, but those ddp3's do eat a lot of fuel compared to stock...

-j

 

[JacobsD]

Keep playing with that AFC, some people can milk 50+ horsepower out of just adjustments in there. If you slide your plate all the way forward you'll flow more fuel too



Also, I'd suggest a 3k governor spring kit, it was my favorite mod back when I had my 12ver. gives you a TON more usable RPM.

 

[Forrest Nearing]

just don't outrightly abuse the HX40, and it'll last a long time. overspeeding it will kill it. Keep the boost below 40psi, and you'll be golden.



I beat the tar out of one on my '97 for about 65k miles and it was tight as the day I installed it when I sold the truck. I ran it at 42psi for half of those miles, and then after adding more fuel, I actually turned the boost down to 38/39 because it was just making hot air above that

 

[Forrest Nearing]

I'd suggest a 4k kit!

 

[DHixson]

I have a 3K from Piers, I just don't know where to put it in at or how. One of those things I wanna be sure of before I attempt it. I was also wondering about the valve springs being stock w/ a 3k?? Not to mention I am running a 53 block, but it was litterally the only 12V in the entire state of AK(checked for weeks).

 

[DHixson]

JacobsD, I heard I could get a lil more by messing with the AFC but unfortunately for me I gotta wait till I get outta AK to get it on a dyno.



Forrest, I am hittin 30psi now but I have never messed with one to adjust it. I can't get into 5th very far before I hit 1200 pyro. I still got a lot of gear left too, any suggestions??

 

[Forrest Nearing]

don't worry about a 53 block in a 12v, I've owned a few of them w/ no worries. it's the later 24v's you have to worry about!



crank the boost on your turbo up to about 39-40psi and see if that doesn't take care of your EGT problems

 

[DHixson]

will do, thanks 4 the help. gonna do that as soon as I get my new 215 pump since my 180 just went out today.