Fishin' for Input!
Posting Guru
Joined: Dec 2003
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From: NW Arkansas
Maybe I have a different way of thinking but has no one thought of the fact that a tune advances your timing?
This would make better use of fuel in the cylinder even if you don't tell the injectors to add any.
This would make better use of fuel in the cylinder even if you don't tell the injectors to add any.
Butt-Head
Joined: Apr 2004
Posts: 9,279
Likes: 2,763
From: Reed Point, MT
Posting Guru
Joined: Dec 2003
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From: NW Arkansas
I would think it will make quite a difference. A 12v Cummins is a dog until you bump the timing up a few degrees
Butt-Head
Joined: Apr 2004
Posts: 9,279
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From: Reed Point, MT
Not to fuel the fire, but 12V Cummins engines run fixed timing regardless of engine speed and load.
The computer programming that the 7.3L uses is fully dynamic depending on oil temperature, load, and RPM.
The computer programming that the 7.3L uses is fully dynamic depending on oil temperature, load, and RPM.
Posting Guru
Joined: Dec 2003
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From: NW Arkansas
Do you do your own tuning? I have never heard of having two identically fueled tunes w/ the only parameter changed is the timing
Thread Starter
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Hotshot
Joined: Jan 2011
Posts: 18,849
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From: Puget Sound
Glad you could make it. I'm looking at air flow/boost dynamics and I have one question I haven't found an answer to: My boost "crashes" to 0 after stomping on it and letting off when passing a vehicle. A/Ox4 has a vid of his boost drop, but the situation I'm describing is far harsher than what I saw there. I mentally hear the needle bounce off the zero and I'm thinking I should back off the pedal a bit easier when passing. Am I correct in my concern, or am I just displaying my "anality"?
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
True. That is why I said that increasing timing makes a big difference. I may be comparing apples to oranges here but timing increases are the reason diesel engines can go out and gain 100hp with a chip.
Do you do your own tuning? I have never heard of having two identically fueled tunes w/ the only parameter changed is the timing
Do you do your own tuning? I have never heard of having two identically fueled tunes w/ the only parameter changed is the timing
In case you didn't know who Cody is...quoted from the PHP About us website.
In April 2010, Cody, a Montana native, joined Bill and Corey. They were first introduced when he purchased their Minotaur Automotive Tuning Software in early 2009. A few months later (after reading many of his posts on various diesel forums), they asked him to become a moderator on the PHP Forum, and they've been great friends ever since! Cody is an ASE certified automobile technician with a decade of General Motors dealership experience under his belt, and he has been custom tuning 7.3L PSDs for several years. Cody has taken on many responsibilities related to the 7.3L PSD including answering e-mails, PMs, & phone calls, troubleshooting customer problems, and programming chips. In addition, with his extensive knowledge, Cody easily learned the ins and outs of gasoline tuning. He is an irreplaceable part of the PHP team.
Butt-Head
Joined: Apr 2004
Posts: 9,279
Likes: 2,763
From: Reed Point, MT
FUEL is the main reason 7.3L engines go out and gain 100 HP. Since we're on it, the main reason I changed your "diesels" to "7.3L" is because the 7.3L is the ONLY diesel in light duty trucks that is capable of using a "chip".
Originally Posted by jkidd_39
Ase certified mech. Explains the lack of charm and know it all attitude.
Oh, and thanks for the personal attack. Sorry that I don't sugar-coat much of what I say. I guess that's what we get in today's "everyone gets a trophy" society.
Butt-Head
Joined: Apr 2004
Posts: 9,279
Likes: 2,763
From: Reed Point, MT
I have one question I haven't found an answer to: My boost "crashes" to 0 after stomping on it and letting off when passing a vehicle. A/Ox4 has a vid of his boost drop, but the situation I'm describing is far harsher than what I saw there. I mentally hear the needle bounce off the zero and I'm thinking I should back off the pedal a bit easier when passing. Am I correct in my concern, or am I just displaying my "anality"?
What's happening in your situation is once the fuel goes away, so does the boost (remember that discussion we had?
) because the drive pressure is suddenly gone (turbine side). It takes a lot of exhaust "power" to move air through the compressor. Even though the compressor isn't a positive-displacement pump, it still takes more power to spin the compressor faster at high boost levels. (I'm talking turbo shaft power created by the turbine.) The amount of power it takes will cause the shaft to instantly slow down to a speed where the drive and boost pressures are equal once fuel is cut off or flow is decreased suddenly (upshift, etc.) The noise heard during this time is air pressure being released back through the compressor housing. Like I said, the compressor is not a positive displacement pump so there is nothing "sealing" the air that has already been ingested through the compressor from going back to atmospheric pressure.Is it bad? I suppose it can't be too good for stuff. Inertia is your friend most times, but when it comes to deceleration at a high rate, it can also be bad (think getting in a head-on collision with a non-crumple-zone car vs. one that collapses at a controlled rate). Although the outcome is never good, it's always better to decelerate "slower".
Butt-Head
Joined: Apr 2004
Posts: 9,279
Likes: 2,763
From: Reed Point, MT
Oh, Rich.
Also, I'm sorry that I haven't been around for the past week. I had to go to New Mexico to pick up my new work service truck.
Besides topping out at 60 MPH, the crappy roads through CO, and technically only being able to put in 10 hours a day (work stipulation, not mine), I got back on Friday. Yesterday (Saturday) I had fire class all day, and today is "get back to tuning because I have a weeks' worth of catch-up" day before full-time work starts again.
Also, I'm sorry that I haven't been around for the past week. I had to go to New Mexico to pick up my new work service truck.
Besides topping out at 60 MPH, the crappy roads through CO, and technically only being able to put in 10 hours a day (work stipulation, not mine), I got back on Friday. Yesterday (Saturday) I had fire class all day, and today is "get back to tuning because I have a weeks' worth of catch-up" day before full-time work starts again.
Posting Guru
Joined: Dec 2003
Posts: 2,392
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From: NW Arkansas
Negative, ghost rider.
FUEL is the main reason 7.3L engines go out and gain 100 HP. Since we're on it, the main reason I changed your "diesels" to "7.3L" is because the 7.3L is the ONLY diesel in light duty trucks that is capable of using a "chip".
I have NEVER, EVER used that certification to justify anything I've ever said to anyone in person or over the internet. In fact, that certification means very little to me as I know countless people who have for many years been able to pass those idiotic "multiple-guess-question" tests who I wouldn't trust to put air in my tires. I put ZERO faith in that testing method/system.
Oh, and thanks for the personal attack. Sorry that I don't sugar-coat much of what I say. I guess that's what we get in today's "everyone gets a trophy" society.
FUEL is the main reason 7.3L engines go out and gain 100 HP. Since we're on it, the main reason I changed your "diesels" to "7.3L" is because the 7.3L is the ONLY diesel in light duty trucks that is capable of using a "chip".
I have NEVER, EVER used that certification to justify anything I've ever said to anyone in person or over the internet. In fact, that certification means very little to me as I know countless people who have for many years been able to pass those idiotic "multiple-guess-question" tests who I wouldn't trust to put air in my tires. I put ZERO faith in that testing method/system.
Oh, and thanks for the personal attack. Sorry that I don't sugar-coat much of what I say. I guess that's what we get in today's "everyone gets a trophy" society.
In regards to sugar-coating... It ain't coating. It's you defending the fact that you come off as a total tool. Give me info and prove me wrong with a polite tone I will be much nicer. Be a dbag and I can dispute everything.
I have learned you get much farther with a smile.. Seems like a typical tuner deal. Bill's attitude floats your company, while your main "competition's" I know everything views hurts more than help.
Perhaps we are looking at only one side of the tuning equation. It's a system so there are tons of parameters to change on these trucks. But to say tuning changes nothing seems strange to me.
Please feel free to get this back on track with dyno graphs or something concrete. Maybe even in a positive tone.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 24
From: Damon (South East Texas)
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Is it bad? I suppose it can't be too good for stuff. Inertia is your friend most times, but when it comes to deceleration at a high rate, it can also be bad (think getting in a head-on collision with a non-crumple-zone car vs. one that collapses at a controlled rate). Although the outcome is never good, it's always better to decelerate "slower".
Is it bad? I suppose it can't be too good for stuff. Inertia is your friend most times, but when it comes to deceleration at a high rate, it can also be bad (think getting in a head-on collision with a non-crumple-zone car vs. one that collapses at a controlled rate). Although the outcome is never good, it's always better to decelerate "slower".
I would say that most moving objects suffer more damage due to rapid deceleration than that of overacceleration.