tuning car with HP tuners tonight

[SubSonic]

well HP Tuners has finally released the 1.8 and my buddy has the program so for 100 bux im gonna have a custom tune in my car. gonna do a MPG tune first then might do a slight performance to see if i can help this thing get out of its own way.

 

[Stew]

Right on! Keep us updated.

 

[mitdr774]

Very limited for some things. I have not played much with mine lately. Very easy to get into trouble. Pay close attention to KR when making changes. I made a few minor changes that resulted in massive amounts of KR at low RPM. Had to fix them, but it is easy to make a mistake with this engine. Some changes also do not take effect and you have to pay attention to what is actually going on with the engine to figure out how to make those changes.

 

[SubSonic]

my friend that is doing the tuning for me has been doing tunes one many cars with HP and i trust him with it, we only changed the stoich afr =2 right now and made the trottle 100% across the board. hes gonna have me log the car for driveability and then hes gonna see what he can do to try and get the 1.8 to a min 45-48 mpg. i was getting an average of 43 before so hopping it wont be to hard to get a little more out of it. but i will say the throttle response is WAY better then stock, it wouldnt hit 100% untill 4400rpm.

 

[Larrymer]

Stoich AFR = 2?

Even if you're not at 100% throttle, that little engine will be unthrottled way before it gets to 100%. Yes, you can make throttle mapping more responsive, but before the tune at "WOT" isn't really going to be different than at true 100% WOT as the flow and pressure is essentially the same (unless you made other changes).

 

[ScarabEpic22]

I'm with Larrymer on this, stoich AFR=2? Even if we're talking Lambda or EQR here, still doesnt make sense.

Personally, I wouldnt shoot for a MPG/econ and a power tune. Id start with tuning it correctly and I'm betting you'll be pleasantly surprised that also nets the best mileage. The best MPGs comes from properly calibrating/modeling the engine's airflow and optimizing spark timing. There's not much left to change efficiency-wise on the engine once you have the MAF/VE coeffs calibrated correctly and have the spark timing dialed in. You can change the trans shift points a little if you have an auto, might be the last .5mpg you're looking for.

 

[Kodiakbearr]

I'm not too well versed on tuning, but keep us updated on the progress. Excited to see what type of performance gain we can get from this in the 1.8. Trifecta didn't exactly increase performance all that much, so if this could be better i'll tune with this.

 

[SubSonic]

well i may have miss typed my last comment, but sofar we have taken the demanded stoich AFR from 14.5 and made that a bit higher so the cpu wouldnt add as much fuel. then we added 1* of timing to give a little more pep and changed the throttle limitations in the lower rpm's. the car is running alot better and im averaging almost 46mpg with 90% of that being highway driving at 65mph.

 

[mitdr774]

How much higher did you move the AFR?

If you want NLS you have to set the allowed throttle position below 84%. For some reason I only see up to 84% throttle opening and if NLS threshold is set above 84% the ECM will not allow it.

My best economy runs have all been on Illinois gas so far. Not sure what is different between your gas and Mi gas, but it cant be the same blend.

 

[SubSonic]

i think we upped the AFR from 14.4 to 15.2, nothing to major just a little, and im not worried about NLS cause i use the car to commute from Belvidere to Chicago 6 days a week. i put nearly 700 miles a week on the car and am just trying to get a little better MPGs.

 

[jdchin87]

I like what i'm reading. More updates!