injector pump tuning
Postmaster
Joined: Feb 2011
Posts: 3,560
Likes: 1
don't mess with the throttle stop. its probably there for a reason. if you want to increase the maximum fuel output, there is an adjustment screw under a little cover on the side of the IP. thats where you want to make your adjustment.
its a little triangular cover, i'm sure someone here has a pic of it, i've not adjusted mine, but i think i identified it on my spare IP - but i'm not sure enough to point you in the wrong direction
its a little triangular cover, i'm sure someone here has a pic of it, i've not adjusted mine, but i think i identified it on my spare IP - but i'm not sure enough to point you in the wrong direction
Postmaster
Joined: Dec 2004
Posts: 2,941
Likes: 32
From: Maple Valley, WA
The throttle stop is just going to minimally give you a bit more RPM, just puts more pressure on the Gov spring and holds the metering valve open a little further. If you want more RPM, than you can adjust it (only about a 1/2 turn at a time, then test), but if you are just looking for more fuel on the lower end, it wont give you anything.
My truck for example, uses the whole sweep of the cable, I set it like that to get as much metering valve travel as possible... Its not necessary on a DB2, as the metering valve flows plenty for that in stock form.
A better way to get more RPM, if thats what you are after, is to adjust the Gov stud just above the head (part where the injection lines go on)...If you turn it in, it will give you more RPM...
My truck for example, uses the whole sweep of the cable, I set it like that to get as much metering valve travel as possible... Its not necessary on a DB2, as the metering valve flows plenty for that in stock form.
A better way to get more RPM, if thats what you are after, is to adjust the Gov stud just above the head (part where the injection lines go on)...If you turn it in, it will give you more RPM...
Thread Starter
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Elder User
Joined: Jul 2012
Posts: 501
Likes: 0
From: Adair, ok
The throttle stop is just going to minimally give you a bit more RPM, just puts more pressure on the Gov spring and holds the metering valve open a little further. If you want more RPM, than you can adjust it (only about a 1/2 turn at a time, then test), but if you are just looking for more fuel on the lower end, it wont give you anything.
My truck for example, uses the whole sweep of the cable, I set it like that to get as much metering valve travel as possible... Its not necessary on a DB2, as the metering valve flows plenty for that in stock form.
A better way to get more RPM, if thats what you are after, is to adjust the Gov stud just above the head (part where the injection lines go on)...If you turn it in, it will give you more RPM...
My truck for example, uses the whole sweep of the cable, I set it like that to get as much metering valve travel as possible... Its not necessary on a DB2, as the metering valve flows plenty for that in stock form.
A better way to get more RPM, if thats what you are after, is to adjust the Gov stud just above the head (part where the injection lines go on)...If you turn it in, it will give you more RPM...
Senior User
Joined: Sep 2012
Posts: 121
Likes: 0
From: kilgore ,Texas
Ok do screwing the screw out does away with the gov of fuel u get but screwing it in gives u more ???? I think I didn't comprehend what yall where saying on that
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