torque screw questions..
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
torque screw questions..
I know this has been brought up a number of times.. I am just looking for a little more bottom end, I have a 6.9 that is naturally aspirated. The pump and injectors came out of a 7.3, that were rebuilt. Any help would be appreciated on this torque screw meaning which way in or out lol, & I do have a pyro, like I said I'm just looking for a little more bottom and and not really looking for a smokeshow. Here are some pictures just to make sure this is the screw
And I also used the lines of of the 7.3
And I also used the lines of of the 7.3
Fleet Mechanic
Joined: Aug 2011
Posts: 1,570
Likes: 258
The top hex bolt would be for the top cover, the bottom stud with nut is the "Min/Max rod" (don't adjust that one) and the torx screw with no paint on it would be the torque screw. It looks like who ever rebuilt that pump just removed the torque screw all together (it should be a stud with a nut on it)
All the screw does it limit max fuel at LOW rpm so you don't get black smoke, at high rpm max fuel is limited by the internal leaf spring and the torque screw doesn't do anything.
Adjusting the screw out will give more fuel at lower rpm but if it's set correctly to begin with it won't help much if at all and all you'll get is more black smoke (and this is assuming the screw that's in there right now is even doing anything at the moment or if the pump builder just calibrated it like a pump with out the screw).
Take a look at this thread:old db2 tricks has lots of good info.
All the screw does it limit max fuel at LOW rpm so you don't get black smoke, at high rpm max fuel is limited by the internal leaf spring and the torque screw doesn't do anything.
Adjusting the screw out will give more fuel at lower rpm but if it's set correctly to begin with it won't help much if at all and all you'll get is more black smoke (and this is assuming the screw that's in there right now is even doing anything at the moment or if the pump builder just calibrated it like a pump with out the screw).
Take a look at this thread:old db2 tricks has lots of good info.
Lead Driver
Joined: Apr 2008
Posts: 6,938
Likes: 13
yea thats what i was thinking, that torx screw is in the right spot, but doesnt look like mine. Pull it out and see what it looks like, how long is it for example? I can go out to my other pump and see how much its sticking into the pump if you like. I set it so that it would haze pretty good but not roll coal, granted i have a turbo too, but it doesnt spool that fast anyway. I had to back mine off pretty good after i turned up the fuel.
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
I'll pull out the screw tomorrow I don't have a Torx bit or a allen wrench that will fit right now.
Trending Topics
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 30
From: Maple Valley, WA
That's just a plug.
The Torque screw is just for emissions, its a metering valve limiter for snap tests and whatnot. It basically (Governor influence aside) does the same thing as putting a block of wood under your accelerator pedal.
All my pumps get a plug in place of the torque screw.
The Torque screw is just for emissions, its a metering valve limiter for snap tests and whatnot. It basically (Governor influence aside) does the same thing as putting a block of wood under your accelerator pedal.
All my pumps get a plug in place of the torque screw.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Elder User
Joined: Nov 2013
Posts: 627
Likes: 0
From: Manteca
That's just a plug.
The Torque screw is just for emissions, its a metering valve limiter for snap tests and whatnot. It basically (Governor influence aside) does the same thing as putting a block of wood under your accelerator pedal.
All my pumps get a plug in place of the torque screw.
The Torque screw is just for emissions, its a metering valve limiter for snap tests and whatnot. It basically (Governor influence aside) does the same thing as putting a block of wood under your accelerator pedal.
All my pumps get a plug in place of the torque screw.
Thread
Thread Starter
Forum
Replies
Last Post
Deereguy90
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
2
Aug 16, 2011 10:05 PM
therifleman556
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
14
Mar 22, 2011 11:10 PM