Got the exhaust installed and messed with the cranking and idle fueling. It seems pretty decent, but will definitely need more tweaking. It’s so hot this time of year the water temperature never gets below 75 degrees even after sitting a day.
I decided to try the auto tune function in tuner studio. I never used it before but figured it was worth a try. So I set off for my first drive. I hadn’t even gotten off my street and I could see the auto tune doing its thing. It was starting to get super lean and within a second it brought it to the value on my AFR table. I was pretty impressed. I did some easy driving at varying RPM to let the ECU do its thing, gradually giving it more throttle. I put about 10-15 miles one it and made it back home with no issue. I haven’t floored it yet, mostly because once I put the carpet back in (added some insulation) I’m not getting 100% throttle.
Here’s some initial thoughts:
Exhaust note is much different. I feel like it’s a higher pitch and less “grunty”. Still sounds awesome.
The engine runs much smoother. The 408 sounded and felt like it was wanting to be shifted at 3500 when just normal driving. This thing is just as smooth and happy at 4500 as it is at idle.
Throttle spring is much stiffer on that 90mm. Going to have to train my foot on the input required.
Seems like noticeably less torque off idle. I may not be able to start autocross in 2nd like I did with the 408. This may also be related to my foot being a slow learner and using muscle memory.
It pulls pretty damn good, but not quite up to the 408 yet. Note I haven’t done any timing tuning (very conservative) and it was almost 100 degrees when I was out. Also-not 100% throttle. The 408 did seem to be down on power when it’s this hot out.
I did about 6 long pulls in a row a temp got to 200. It dropped to 190 when I stopped hammering on it.
Overall I’m super pleased and it’s definitely a great start to what I think will be an excellent platform for this car. Planning on putting some miles on it this week to keep dialing in the fuel. Also need to fix that throttle!!!