Questions about Stock Tune on HPtuners Bin
06-15-2009, 02:57 PM
#1
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Questions about Stock Tune on HPtuners Bin Hey everyone, I just had a few questions about a stock tune that I pulled off the HPtuners bin repository. I have a professional tune that I like a lot in my car, but I no longer have access to the stock tune for my car. Even though I love the professional tune I just got HPtuners and I want to work on learning to tune the car myself because I would like to be able to tweak stuff for different driving situations and different weather conditions. I pulled a stock tune off the bin repository and copied all the tables over to my file so I could get a stock tune but there were a few things changed in my tune that I didn't understand.
I don't want to put this stock tune in my car if there is an issue with it so I was hoping some of you experts could look over both of them and tell me if it will be OK.
The things that were changed in my tune from the stock tune that I didn't understand are:
1) Flow Rate Vs. KPA - I have stock injectors so this should have not been touched right?
2) Enable MAP vs. Baro Entry/Exit
3)COT Temp Thresholds
4)Max Torque - I'm assuming this was upped just because the stock number is way less torque then the car makes.
Here is the stock tune from HPtuners:
HPtuners Bin 2005CTS-V Tech 2 Pull.hpt
Here is the professional tune from my car:
Ted Tune 6-4-09.hpt
Thanks for any help you can give me! I just don't want to mess up the car before I even get started!
I don't want to put this stock tune in my car if there is an issue with it so I was hoping some of you experts could look over both of them and tell me if it will be OK.
The things that were changed in my tune from the stock tune that I didn't understand are:
1) Flow Rate Vs. KPA - I have stock injectors so this should have not been touched right?
2) Enable MAP vs. Baro Entry/Exit
3)COT Temp Thresholds
4)Max Torque - I'm assuming this was upped just because the stock number is way less torque then the car makes.
Here is the stock tune from HPtuners:
HPtuners Bin 2005CTS-V Tech 2 Pull.hpt
Here is the professional tune from my car:
Ted Tune 6-4-09.hpt
Thanks for any help you can give me! I just don't want to mess up the car before I even get started!
06-15-2009, 03:03 PM
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Back when, the conventional "wisdom" was to fix
AFR errors by jacking the IFR table. But this is only
appropriate when the error can be traced to a fuel
delivery mismodeling. The airflow side is more often
to blame, most bolt-ons are airflow mods that have
nothing to do with fuel.
But there are year-year differences in injector size,
to watch out for if you have a non-matching .bin
(.hpt) year-year.
Entry/exit MAP, probably DFCO (deceleration fuel
cutoff), a pain-in-the-*** feature that saves you
a fractional MPG and gives you bucking once the
engine is modded much (esp. cammed).
COT threshold, trying to get you to not step into
cat overtemp protection (pig rich) all the time. A
good thing if cats are gone, a possible cat-killer
if not.
Max Torque - just get it out of the way, nobody
wants to be held back.
AFR errors by jacking the IFR table. But this is only
appropriate when the error can be traced to a fuel
delivery mismodeling. The airflow side is more often
to blame, most bolt-ons are airflow mods that have
nothing to do with fuel.
But there are year-year differences in injector size,
to watch out for if you have a non-matching .bin
(.hpt) year-year.
Entry/exit MAP, probably DFCO (deceleration fuel
cutoff), a pain-in-the-*** feature that saves you
a fractional MPG and gives you bucking once the
engine is modded much (esp. cammed).
COT threshold, trying to get you to not step into
cat overtemp protection (pig rich) all the time. A
good thing if cats are gone, a possible cat-killer
if not.
Max Torque - just get it out of the way, nobody
wants to be held back.
06-15-2009, 03:07 PM
#3
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Well the bin says its from a 2005 CTS 5.7L Pull from a Tech 2 and mine is a 2005 CTS-V so should I be concerned about the injectors or should I just toss this tune in and get going?
06-15-2009, 09:00 PM
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Yes, injector tables stay stock. Usually the COT is set to disabled , unless you want an overly rich AFR at WOT.
I don't think you will get into any 'trouble' just running the stock tune. You are going to need a wideband and log at some point to dial in your spark and fueling (preferably a dyno).
I run with CAT's and have COT disabled. I think your cats can handle reasonable 1-2 WOT runs in succession ..multiple WOT might heat the cats up more, so being leaner is going to heat them even more.
I think it is O.K., to run the stock tune. It will give you a solid benchmark to evaluate your future tuning gains anyway.
Go for it..
..WeathermanShawn..
I don't think you will get into any 'trouble' just running the stock tune. You are going to need a wideband and log at some point to dial in your spark and fueling (preferably a dyno).
I run with CAT's and have COT disabled. I think your cats can handle reasonable 1-2 WOT runs in succession ..multiple WOT might heat the cats up more, so being leaner is going to heat them even more.
I think it is O.K., to run the stock tune. It will give you a solid benchmark to evaluate your future tuning gains anyway.
Go for it..
..WeathermanShawn..
