how to adjust afr with hptuners??

[my_bd]

how do you adjust the afr with hptuners software??
what is the process one follows to flatten out the afr?

my gm stage kit afr seems like its a bit lean up to about 5k or so, and then moves towards very rich by redline
so lets say i want to target 11.8 across the board
how do you go about doing this using the hptuners pro s/w with a w/b input ???

would this be a good starting point task to try to do with hptuners s/w?

what about adjusting timing? can that be done afterwards as a separate task? or are these settings inter-related?

[Sp00ner]

Timing and fuel are inter-related. Different A/F ratios have different flame front speeds. Once you get the fuel where you want it, then you adjust the timing.

[my_bd]

so..... how do you go about adjusting the afr?

[WopOnTour]

There are numerous ways to do it
Do you have HPT??
Wop

[my_bd]

not yet - just want to make sure I have everything I will need and that it's something I'm capable of doing - before I take the plunge....
don't want to layout $700u.s. and then find out it's beyond me.
$700u.s. is like a million canadian dollars! lol

[fullthrottle]

Originally Posted by my_bd

how do you adjust the afr with hptuners software??
what is the process one follows to flatten out the afr?

my gm stage kit afr seems like its a bit lean up to about 5k or so, and then moves towards very rich by redline
so lets say i want to target 11.8 across the board
how do you go about doing this using the hptuners pro s/w with a w/b input ???

would this be a good starting point task to try to do with hptuners s/w?

what about adjusting timing? can that be done afterwards as a separate task? or are these settings inter-related?

you say your afr is lean upto 5K what is it at. as far as how to change it there are several different ways to do that. heres a simple example. mind you im only going to give ya one of several ways to alter your air fuel ratio. ythe easiest way to add more air to your engine is to swap your S/C pulley for a smaller one. the easiest way to add more fuel is to swap your injectors for bigger ones. I dont know a whole lot if anything about hp tuners but, If there is a way to lengthen your injector pulse width that would be another way to change your air fuel ratio.

[Sp00ner]

Originally Posted by fullthrottle

you say your afr is lean upto 5K what is it at. as far as how to change it there are several different ways to do that. heres a simple example. mind you im only going to give ya one of several ways to alter your air fuel ratio. ythe easiest way to add more air to your engine is to swap your S/C pulley for a smaller one. the easiest way to add more fuel is to swap your injectors for bigger ones. I dont know a whole lot if anything about hp tuners but, If there is a way to lengthen your injector pulse width that would be another way to change your air fuel ratio.

You don't have to get that low level with HP. There's a line graph where you set the amount of enrichment that the injectors make under WOT, and another for adjust the flow rate based on manifold vacuum. Between those two, it determines the correct amount of fuel to inject.

[TheWastedYears]

If you have doubts, I'd recommend finding someone who already has the software and having them go over it w/ you. There's SO much info I don't think it can be covered in a thread.

Let me see if I can give you a 30,000 ft view, to maybe steer you in the right path.

You have a MAF. MAF measures airflow
You have a MAP. MAP measures pressure in the supercharger (thus, boost)
You have Injectors. Injectors have a metered flow rate, so it's somewhat of a "known" value.

The car has a base table in case the MAF fails. You can edit that, but it won't do you a lot of good unless your MAF fails (or you're just really bored)

Then, you have MAF calibration. You can alter the calibration to tell the PCM to add/subtract fuel as needed. This is an across the board kinda thing. It'll affect a particular RPM, regardless of throttle position

Then, you have the big daddy tables, where you can fine tune things. Like... if I want more fuel at 50% throttle at 4300 RPM.

Then, you have Power Enrichment. Take the big daddy tables, and apply a factor to them to increase fuel (i.e. Piston Protection)

Of course, there's a crapload more that goes into, but that'll give you a general idea of the options you'll have w/ HPT. If none of that made sense, either my explanations were totally wrong, or you should seriously consider whether or not you understand how big this can of worms is.

[fullthrottle]

Originally Posted by Sp00ner

You don't have to get that low level with HP. There's a line graph where you set the amount of enrichment that the injectors make under WOT, and another for adjust the flow rate based on manifold vacuum. Between those two, it determines the correct amount of fuel to inject.

ahhhh si senior.

[my_bd]

Originally Posted by fullthrottle

you say your afr is lean upto 5K what is it at. as far as how to change it there are several different ways to do that. heres a simple example. mind you im only going to give ya one of several ways to alter your air fuel ratio. ythe easiest way to add more air to your engine is to swap your S/C pulley for a smaller one. the easiest way to add more fuel is to swap your injectors for bigger ones. I dont know a whole lot if anything about hp tuners but, If there is a way to lengthen your injector pulse width that would be another way to change your air fuel ratio.

yeah, I'm running the gm stage kit injectors with a 2.7 pulley and K&N cai.
the afr's with the gm kit have always been bouncing up around 14-15 till somewhere close to 5k and by the time I'm up around 7k it's dropped quickly to 10.3-10.5