Speed density tune????
you have the option of repining the stock harness for the later computer or changing the harness and computer.
Staging Lane
Joined: Mar 2006
Posts: 78
Likes: 0
From: Colorado Springs, CO (6200ft altitude =/ )
go here http://www.hptuners.com/help/
hit search on the left side of the screen
type in 2bar (just like that with out the space)
click on GM > Operating System
or if you want to do it with the tree it is
Working with VCM Editor >> Parameters -GM >> Operating System
hope that helps
hit search on the left side of the screen
type in 2bar (just like that with out the space)
click on GM > Operating System
or if you want to do it with the tree it is
Working with VCM Editor >> Parameters -GM >> Operating System
hope that helps
TECH Fanatic
Joined: Dec 2001
Posts: 1,220
Likes: 0
From: Germantown, MD
I'm curious, I'm currently running 12 psi with no real intention to go higher. However i don't want to rule the possibility out. If you're running <14.7psi of boost is the 2-bar map sensor more accurate than the 3-bar?
Mike
Mike
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In many cases I believe the table resolution will be the same, however a 3 bar map sensor has the same 5 volts of area to work under as a 2 bar making the sensor itself the weak link in the accuracy dept. With most 3 bar sensors hovering in the 3-8% accuracy range. If you are running under or around 15psi you'll be better off sticking with a 2 bar map just for the accuracy.
As far as SD tuning myths, temp fluctuations WON'T affect it. SD uses MAP pressure and IAT (from the intake). Period. Doesnt matter how cold it is outside, the IAT is providing a temp value to the PCM that is used in SD mode. HUMIDITY does affect it somewhat (for DA), but overall, once it's set, it's pretty much good to go 
good post. it takes alot of data logging to cover all the bases but if you are patient and understand the internal combustion engine, its fairly straightforward. at any one point in load, rpm, boost, and temp, the engine only needs one amount of fuel. might seem simple, but add those number of variables up and there is alot of tuning to do. Once you get some of it down you can make an educated guess and tune on the safe side on the rest of the areas, then start logging when you get the time. Personally its hard for me to tune for cool weather, how the hell am I going to tune something for 30 degree weather when there is about 5 hours PER YEAR that it gets that cold down here? LOL. So I just need to make an educated guess and tune on the safe side for the cold. Humidity never really seemed to be an issue for me, and we have plenty of it
I also think jake makes a great point. tuning the fuel curve "guessing" with a FI application is asking for trouble. the technology is there and easily accessable, why not use it?
