Turning up pump 6.9
New User
Joined: Aug 2018
Posts: 23
Likes: 2
So what is the optimal EGT's I should be seeing on my Pyro gauge?
I've got the 6.9L with a Garrett Turbo system on. When I floor it from throttle I'm basically Prius repellant. So my fuel screw is turned up at the max it needs to be, could probably turn it down a little.
I have the T19 4 speed, and at 60mph, shes revving st 2500RPM, and if I keep my foot lightly on the throttle to maintain that, the Pyro gauge rests around 450.
Merging on any highway, and shes up to 800, never above 900. Is that normal temps then?
I've got the 6.9L with a Garrett Turbo system on. When I floor it from throttle I'm basically Prius repellant. So my fuel screw is turned up at the max it needs to be, could probably turn it down a little.
I have the T19 4 speed, and at 60mph, shes revving st 2500RPM, and if I keep my foot lightly on the throttle to maintain that, the Pyro gauge rests around 450.
Merging on any highway, and shes up to 800, never above 900. Is that normal temps then?
Elder User
Joined: May 2018
Posts: 695
Likes: 22
As far as I know, I don't know how to determine the current fuel screw orientation. It's just a hex allen key, so it's anybody's guess how much it's turned up.
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
The "calibration" is just a peak fuel limit. If you see black smoke you have too much. You can even run it with way too much available, because your right foot also controls the fueling.
It's not like a gasser where you are adjusting for "rich" or "lean" - its always running lean, the mix ratio is controlled(more or less) by your right foot up to the limit set by that screw.
Elder User
Joined: May 2018
Posts: 695
Likes: 22
The "calibration" is just a peak fuel limit.
Postmaster
Joined: Dec 2011
Posts: 3,860
Likes: 7
Beg to disagree. I got to be friends with the injection shop owner our heavy truck shop dealt with and I watched him calibrate more than one pump. There's at least 8-12 calibrations done on a IDI pump when on the test stand. That $200+ labor charge covers a lot more that peak fuel limit.
Lead Driver
Joined: Apr 2008
Posts: 6,942
Likes: 13
I don't think it would add 50% more HP than stock. From what I read, the IDIT's got only a handful more HP with the turbo, but the substantial increase was in the improved torque.
Regardless, If the OP truly is an NA IDI, then adding a turbo would be good regardless of the minor HP/major TQ improvement.
Regardless, If the OP truly is an NA IDI, then adding a turbo would be good regardless of the minor HP/major TQ improvement.
More Turbo
Joined: May 2013
Posts: 597
Likes: 2
From: Prague Czech Republic
I own the 6.9 for almost five years and I have to admit the best upgrade is the turbo. I have a sidewinder, intercooled. The second best thing is to intercool it. The third best thing is to get the injectors pop tested and verify they spray good, do not drip and all pop at the same pressure. The next is set the timing right where it should be by a timing light. I lack that one and moving it back and forth with limited results. The next best upgrade is to change every! rubber fuel line. If it does not leak, it does not say anything about letting air in. I did that this week, sick of air intrusion and timing issues conected with it. I must say the truck runs the best ever I owned it, starts on a first crank cold, hot. I just returned from a 200 mile trip, half way with empty trailer, the return way with 1700kg car on it, 2200kg behind the IDI, and I got 18mpg. I do have the pump maxed out, do not have a pyro, I just watch the exhaust smoke, if it smokes, I just back of the throttle or downshift.
Tinkering with the fuel screw when NA does not bring u much gain, as u are not able to draw more air to the engine. Basically, smoke is wasted fuel out of the tail pipe,
Tinkering with the fuel screw when NA does not bring u much gain, as u are not able to draw more air to the engine. Basically, smoke is wasted fuel out of the tail pipe,
Thread
Thread Starter
Forum
Replies
Last Post
CantGetR1ght
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
17
Feb 14, 2018 02:45 PM
90cclb4x4IDIzf5
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
5
Jun 14, 2016 05:07 PM
Brant Bowrifle
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
4
Mar 21, 2011 11:25 AM
BoostLover
Pre-Power Stroke Diesel (7.3L IDI & 6.9L)
3
Oct 28, 2003 05:44 PM
