AC Code Injectors for Reliability?
Posting Guru
Joined: Sep 2014
Posts: 2,404
Likes: 3
From: Asheville-where weird is
Very valid points have been made. Go with new Alliant injectors and you really don't have to worry about failure. How many threads are devoted to the failure of NEW injectors? There are quite a few when it comes to remans.
NEW P.I.S. 175/80's are my next set. They can be tuned to run almost exactly like AC codes = 160/0's with the added benefit of having more fuel available with the switch of a tune while still giving you a faster injection event in the de-tuned, lower HP range, that is impossible with the AC codes. This equals a much more efficient burn which will lower the ALL important EGT's every time. 80%'er are easily tuned/detuned. If a tuner says otherwise, choose a different tuner.
As for tunes, Matt @ Gearhead, all day everyday. His tunes are cleaner, have lower EGT's, the injectors are quieter, transmission shifts are smooth/don't slam into gear, etc on the first set of tunes he sends than the other vendors are after the second, third, and fourth revisions.
Just once I experimented and could not get my truck to exceed 1200* F pulling 12k up a 7% grade on any of his tunes with the exception of the highest HP tune and it looks as though it would hover around 1300* if I stayed in it. Is he erring on the side of safety and leaving a little HP & Tq on the table? I would say "YES" and that is fine with me.
NEW P.I.S. 175/80's are my next set. They can be tuned to run almost exactly like AC codes = 160/0's with the added benefit of having more fuel available with the switch of a tune while still giving you a faster injection event in the de-tuned, lower HP range, that is impossible with the AC codes. This equals a much more efficient burn which will lower the ALL important EGT's every time. 80%'er are easily tuned/detuned. If a tuner says otherwise, choose a different tuner.
As for tunes, Matt @ Gearhead, all day everyday. His tunes are cleaner, have lower EGT's, the injectors are quieter, transmission shifts are smooth/don't slam into gear, etc on the first set of tunes he sends than the other vendors are after the second, third, and fourth revisions.
Just once I experimented and could not get my truck to exceed 1200* F pulling 12k up a 7% grade on any of his tunes with the exception of the highest HP tune and it looks as though it would hover around 1300* if I stayed in it. Is he erring on the side of safety and leaving a little HP & Tq on the table? I would say "YES" and that is fine with me.
Thread Starter
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Tuned
Joined: Jan 2014
Posts: 441
Likes: 5
Very valid points have been made. Go with new Alliant injectors and you really don't have to worry about failure. How many threads are devoted to the failure of NEW injectors? There are quite a few when it comes to remans.
NEW P.I.S. 175/80's are my next set. They can be tuned to run almost exactly like AC codes = 160/0's with the added benefit of having more fuel available with the switch of a tune while still giving you a faster injection event in the de-tuned, lower HP range, that is impossible with the AC codes. This equals a much more efficient burn which will lower the ALL important EGT's every time. 80%'er are easily tuned/detuned. If a tuner says otherwise, choose a different tuner.
As for tunes, Matt @ Gearhead, all day everyday. His tunes are cleaner, have lower EGT's, the injectors are quieter, transmission shifts are smooth/don't slam into gear, etc on the first set of tunes he sends than the other vendors are after the second, third, and fourth revisions.
Just once I experimented and could not get my truck to exceed 1200* F pulling 12k up a 7% grade on any of his tunes with the exception of the highest HP tune and it looks as though it would hover around 1300* if I stayed in it. Is he erring on the side of safety and leaving a little HP & Tq on the table? I would say "YES" and that is fine with me.
NEW P.I.S. 175/80's are my next set. They can be tuned to run almost exactly like AC codes = 160/0's with the added benefit of having more fuel available with the switch of a tune while still giving you a faster injection event in the de-tuned, lower HP range, that is impossible with the AC codes. This equals a much more efficient burn which will lower the ALL important EGT's every time. 80%'er are easily tuned/detuned. If a tuner says otherwise, choose a different tuner.
As for tunes, Matt @ Gearhead, all day everyday. His tunes are cleaner, have lower EGT's, the injectors are quieter, transmission shifts are smooth/don't slam into gear, etc on the first set of tunes he sends than the other vendors are after the second, third, and fourth revisions.
Just once I experimented and could not get my truck to exceed 1200* F pulling 12k up a 7% grade on any of his tunes with the exception of the highest HP tune and it looks as though it would hover around 1300* if I stayed in it. Is he erring on the side of safety and leaving a little HP & Tq on the table? I would say "YES" and that is fine with me.
I now have to make a decision. I had all 8 of my injectors flow tested, and 5 of them failed. A few flowed to low and a couple failed because they were flowing to high. Diesel Injection Service in Grand Rapids, MI recommends I replace all 8, and that is my intent. I am leaning towards the 175/80's from PIS and Gearhead tuning.
Do I have to high of hopes, are am I right in thinking that my fuel mileage and hard starts should go up? Conservative driving pulling my 8,000 pound TT driving 65 MPH at sea level, i'm hand calculating I get 7.2MPG. I was hoping for more around 13.
Cargo Master
Joined: Mar 2008
Posts: 2,975
Likes: 19
From: Archdale,N.C.
Great info indeed.
I now have to make a decision. I had all 8 of my injectors flow tested, and 5 of them failed. A few flowed to low and a couple failed because they were flowing to high. Diesel Injection Service in Grand Rapids, MI recommends I replace all 8, and that is my intent. I am leaning towards the 175/80's from PIS and Gearhead tuning.
Do I have to high of hopes, are am I right in thinking that my fuel mileage and hard starts should go up? Conservative driving pulling my 8,000 pound TT driving 65 MPH at sea level, i'm hand calculating I get 7.2MPG. I was hoping for more around 13.
I now have to make a decision. I had all 8 of my injectors flow tested, and 5 of them failed. A few flowed to low and a couple failed because they were flowing to high. Diesel Injection Service in Grand Rapids, MI recommends I replace all 8, and that is my intent. I am leaning towards the 175/80's from PIS and Gearhead tuning.
Do I have to high of hopes, are am I right in thinking that my fuel mileage and hard starts should go up? Conservative driving pulling my 8,000 pound TT driving 65 MPH at sea level, i'm hand calculating I get 7.2MPG. I was hoping for more around 13.
Posting Guru
Joined: Sep 2014
Posts: 2,404
Likes: 3
From: Asheville-where weird is
Great info indeed.
I now have to make a decision. I had all 8 of my injectors flow tested, and 5 of them failed. A few flowed to low and a couple failed because they were flowing to high. Diesel Injection Service in Grand Rapids, MI recommends I replace all 8, and that is my intent. I am leaning towards the 175/80's from PIS and Gearhead tuning.
Do I have to high of hopes, are am I right in thinking that my fuel mileage and hard starts should go up? Conservative driving pulling my 8,000 pound TT driving 65 MPH at sea level, i'm hand calculating I get 7.2MPG. I was hoping for more around 13.
I now have to make a decision. I had all 8 of my injectors flow tested, and 5 of them failed. A few flowed to low and a couple failed because they were flowing to high. Diesel Injection Service in Grand Rapids, MI recommends I replace all 8, and that is my intent. I am leaning towards the 175/80's from PIS and Gearhead tuning.
Do I have to high of hopes, are am I right in thinking that my fuel mileage and hard starts should go up? Conservative driving pulling my 8,000 pound TT driving 65 MPH at sea level, i'm hand calculating I get 7.2MPG. I was hoping for more around 13.
More Turbo
Joined: Jan 2006
Posts: 687
Likes: 15
From: Lake Charles, LA
I pull my gooseneck trailer loaded with tractor, atv, and other misc stuff on it weighing around 10k and I get around 10-10.5 mpg while towing. That is mostly flat ground, some smallish hills compared to most you guys, and cruise on 65.
More Turbo
Joined: Dec 2009
Posts: 661
Likes: 0
Great info indeed.
I now have to make a decision. I had all 8 of my injectors flow tested, and 5 of them failed. A few flowed to low and a couple failed because they were flowing to high. Diesel Injection Service in Grand Rapids, MI recommends I replace all 8, and that is my intent. I am leaning towards the 175/80's from PIS and Gearhead tuning.
Do I have to high of hopes, are am
I right in thinking that my fuel mileage and hard starts should go up? Conservative driving pulling my 8,000 pound TT driving 65 MPH at sea level, i'm hand calculating I get 7.2MPG. I was hoping for more around 13.
I now have to make a decision. I had all 8 of my injectors flow tested, and 5 of them failed. A few flowed to low and a couple failed because they were flowing to high. Diesel Injection Service in Grand Rapids, MI recommends I replace all 8, and that is my intent. I am leaning towards the 175/80's from PIS and Gearhead tuning.
Do I have to high of hopes, are am
I right in thinking that my fuel mileage and hard starts should go up? Conservative driving pulling my 8,000 pound TT driving 65 MPH at sea level, i'm hand calculating I get 7.2MPG. I was hoping for more around 13.
Kyle
Lead Driver
Joined: Sep 2005
Posts: 9,399
Likes: 188
From: Norco,CA
I pretty sure you will be really happy. But towing I wouldn't except not much more then 10. If it's better then be really happy. I forgot the weight of your trailer but if it's 10K or more that's what I would except. I'm really happy for the guys that get better, I don't but I have 4.10's.
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Brett Foote
Elder User
Joined: Sep 2011
Posts: 979
Likes: 4
From: Vancouver
I think after getting new injectors in place, paying attention to how heavy the right foot is when accelerating/climbing hills can result in significant fuel savings. It is hard to stay off the go pedal though. That is why it is difficult to compare fuel mileage.
Hotshot
Joined: Jan 2011
Posts: 18,849
Likes: 179
From: Puget Sound
Laughing Gas
Joined: Nov 2010
Posts: 1,159
Likes: 33
From: Utah
Regarding emissions, here in Washington State, my truck has to go to DEQ every two years and pass the 'snap' test which as instructed, is where they clip onto the battery for RPM, place a opacity meter onto the tailpipe and proceed to have you floor the throttle quickly 5-7 times total and measure the particulate that is emitted. It seems like that would be the worst conditions as the turbo isn't getting into boost when the injectors pulse width is dumping fuel to get the engine going. I just completed this test last week with the 175/80's and passed using a 'stock' tune from PHP.
These injectors are quieter than the 170k AD's they replaced, get better mileage, and have much more power than I anticipated. Just completed a 3K mile camping trip towing our trailer through Yellowstone and Glacier with some long tough pulls in/out of Glacier with 104* intake temps and the performance was awesome.
Food for thought.
These injectors are quieter than the 170k AD's they replaced, get better mileage, and have much more power than I anticipated. Just completed a 3K mile camping trip towing our trailer through Yellowstone and Glacier with some long tough pulls in/out of Glacier with 104* intake temps and the performance was awesome.
Food for thought.
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Tim Hodgson
1999 - 2003 7.3L Power Stroke Diesel
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Nov 30, 2012 01:22 PM