Tuning

[Big_T]

7.5 sec is a respectable number and i can live with it, personally I care more about handling than anything else (appearance, etc) since i haven't washed mine for over a year. I am still hopeful that Chris and his friends can get us into the Subaru Forester turbo range of 6.5 sec. Gas mileage for me is a terrible 21.8 mpg due to short trips on a cold motor, I just don't see waiting 3 minutes to warm it up when my grocery run is 10 minutes away. Though it does run and shift badly until it gets warm.

My personal thrill is over inflating the tires a bit (3-4psi) and getting them to spin off the line for ~30 feet. I can even be rolling at 5-10mph then punch it and still get a good squeal from the tires. Haha it freaks everyone out that such a little SUV can do that. I don't do this daily but it sure is fun to see the look on people's faces.

 

[Chris_Top_Her]

Not bad, (not my log). nothing crazy on the ig timing, increased mass flow, completely stock 2.5 sky

 

[Chris_Top_Her]

I came across some info about g/s airflow rate and how it is approximate to tq (from multiple sources and g/s vs dyno comparisons). My last log showed a max g/s of 165. That can be *roughly* equated to 165 ft/lb of tq, which is only 10% loss on an AWD, auto. I looked at my oldest log, and the g/s was 147 (~20% loss). Once I get my car back (supposedly today) I will put the stock file back on and log again. I run premium.

 

[piotrek91]

I came across some info about g/s airflow rate and how it is approximate to tq (from multiple sources and g/s vs dyno comparisons). My last log showed a max g/s of 165. That can be *roughly* equated to 165 ft/lb of tq, which is only 10% loss on an AWD, auto. I looked at my oldest log, and the g/s was 147 (~20% loss). Once I get my car back (supposedly today) I will put the stock file back on and log again. I run premium.

I not sure what your mean when talk about the "10% or 20% loss" when looking at the airflow rates.. In an ideal world the airflow directly corresponds to torque at the crank, and that has nothing to do with drive-train loss.

If you want valid results, make sure that you allow the ECU to re-learn after the flash before you do any logging.
I read on the mazda 6 forums that even just downloading the ECU with the Tactrix causes the parameters to be reset and requires some time for the ECU to get back to normal performance.

Anyway, good luck with the tune!

 

[Chris_Top_Her]

I not sure what your mean when talk about the "10% or 20% loss" when looking at the airflow rates.. In an ideal world the airflow directly corresponds to torque at the crank, and that has nothing to do with drive-train loss.

If you want valid results, make sure that you allow the ECU to re-learn after the flash before you do any logging.
I read on the mazda 6 forums that even just downloading the ECU with the Tactrix causes the parameters to be reset and requires some time for the ECU to get back to normal performance.

Anyway, good luck with the tune!

I was referring to the oem 185hp/tq and powertrain loss. Although actually the pt loss wouldn't change.