Hello all,
I recently installed a Magnuson 2300 on my M7 ZO6 with some supporting mods and took it to a local shop for tuning. I'm having a few drivability issues and would like to get a second opinion on my tune. The car put down 665/668 on a dynojet on pump 93 and runs much cooler than it did with the stock 1.7 liter blower. I expected those numbers to be a bit higher but I'm pretty much out of fuel as it sits, unable to maintain commanded pressure beyond around 4k rpm. I have an aux low side and flex fuel sensor on order from DSX that will be going on in the next few weeks. The car is a road course car so I want to stay away from meth.
Mods:
Magnuson 2300
2.75" Griptech pulley (70mm)
Haltech intake
Katech 103mm throttle body
Catless downpipes
Stock x-pipe with stock rear cats
Borla S-Type catback exhaust
Weapon X heat exchanger
Secondary radiator
Issues:
knock retard indicated in logs
occasional slight acceleration stumble around 1600-1800 rpm after shifts under normal driving throttle
I've attached the tune file and a stock tune file for comparison.
I've compared the Spark - Advance - Base - High Octane table of my tune with a lightly modified '15, stock '16, and stock '17 tune. Around the Spark Airmass .88ish and rpm 1800ish range there is a significant reduction in timing in my tune compared to the other three. I started to go down the timing path after seeing what I thought was timing dropping off in that rpm range after shifting on a few logs. I've attached a few logs and a screenshot of that area below.
Low rpm WOT: Plantation 1:30
2-3 WOT: Plantation 5:20
series of normal driving shifts: Leaving neighborhood 0:05 and 1:30
Thanks in advance,
Alex
C7Z 2300 70mm.hpt
2016 C7Z stock.hpt
To Plantation.hpl
Leaving neighborhood.hpl
Timing comparison vs stock.PNG