Official 1/8 mile, 1/4 mile, 40-100mph, 0-130mph, 60-130mph dragy and timeslip drag database. How fast are you?

bhvrdr said:

Well done! My apologies for just getting to this. I had clicked on your post when I didnt have my computer.


Post 1 updated

alfa quarter mile database.xlsx

Sheet1 Alfa Romeo Giulia 1/4 Mile Times Stock 4 Cylinder Driver,Engine ,Drive,Dragy/Track,DA,60ft,1/8 ET,1/8 Trap,1/4 ET,1/4 Trap,Fuel (AKI) TheAlfaProduction,280hp,AWD,Dragy,-1379,1.90,8.38,82.11,92 TheAlfaProduction,280hp,AWD,Dragy,-1014,1.91,8.42,81.55,13.24,101.83,92 bhvrdr,280hp,RWD,Dragy,...

docs.google.com

Looks like the jb4 stacking was able to get another psi or so out of the turbo huh? Perhaps bypassing some limits the tuners are having difficulty with. Thats interesting stuff. Be cool to see your logs.

Click to expand...

Thanks!

The logs are in the archive: 60-100 and 60 - 130 logs.zip

11.csv is 40-100 and 15.csv is 60-130 run. Though I suspect there're issues with boost levels reported by JB4 (I've made a post about that at n54/Giulia thread).

My tune has upped ignition and modified wastegate control maps (PWM I guess), combined with lower MAP reading from JB4 readings it is now possible for me to run more ignition under higher boost levels. Besides I think that with JB4 I can now get more benefits from the hardware mods I have (downpipe, K&N) - they allow me to actually squeeze more boost and see knock latter. I think the moment model of the engine seems to be the reason why Giulia is so unresponsive to hardware mods, i.e. intakes, downpipes. ECU simply lowers boost or any other operating parameters which are affected by the mods when it reads that load targets are met. My ECU flash turbo limits may also help and run longer without underboost error (though not sure, had plenty of those errors while playing with MAP6).

My thoughts on the engine moment model. Most ECU tuners work on upping turbo limits and do not touch the moment/load targets. They work with very limited changes to the original maps and do just a very generic stuff (changing 1d turbo limits map, some do ignition maps). Giulias seems to have some reserves in their moment model though they are capped by turbo limits. By removing the limiters higher yet standard load targets become achievable. In colder weather those load targets are easily hit and no matter the turbo limits ECU slows down the turbocharger as soon as load targets within the moment models are seen. Say on a +26C day my turbo could provide 2.7bar absolute pressure at 5500RPM and at +8 it gives around 2.5bar at 5500RPM. JB4 apparently tricks the load values read by ECU and makes it possible to pump more air in colder weather.

On a separate note it doesn't seems there's actually any TRUE Alfa tuner, i.e. a brand that knows and understands Marrelli/Alfa electronics and is capable of making an overhaul of ECU maps touching not just a couple but hundreds and thousands of maps essentially revamping the moment model. E.g. some of other tuners, e.g. working with VAG can even have different axis in their maps, i.e. in all maps have RPM scale ending not at 6500 but 7000.

Post #1 updated:



Added fast4lfa time with squadra!
Q4
93 octane
Squadra Tune
catless dp
centerline exhaust