Sounds like head lift. Bolts have probably stretched a bit, just enough that when under load it can raise the head enough that coolant makes its way into the combustion chamber causing a misfire.
ARP head stud time.
CAR: 2018 Si Sedan
MODS: Modified Mishimoto intake, resonator delete, Vibrant muffler, JB4 +9 map
TRACK: Thunder Valley Raceway Park, Noble OK 1,079ft.
1/4m Time: 14.10
MPH: 101.35
60ft: 2.3
R/T: .675
Note, this was on the stock all-seasons.
First run of the day was against my buddy's...
Over the last couple of weeks, I've noticed that when I turn on my car, if it's on radio, it always pops up the input selection window. It used to not do this (like if I had the radio turned on, stopped the car, and then got back in and turned it on, it would remember that I had it set to say...
Humble in Tulsa is amazing.
If you're just looking for tuning, find Nix Tuning on Facebook.
And if you're not already, join our FB group; facebook.com/okcivics
I not only don't run with the cover, I modded it to be a proper CAI.
https://www.civicx.com/threads/converting-a-mishimoto-intake-into-a-proper-cai.42534/
Happy Friday, folks!
Here's a quick tutorial for turning a Mishimoto intake into a proper CAI.
Parts needed:
Hose clamps - https://www.amazon.com/gp/product/B07PQDRFVH/
Aluminum tubing - https://www.amazon.com/gp/product/B00FAVUD7Y
3" to 2.5" Reducer coupling, 90 degree elbow -...
I've had a JB4 on my Si since February of this year (roughly 10.5k miles with it on), running their Map 7 (+9 psi, E30) daily almost exclusively since that map released (about a month after I got it).
Runs great, no problems. Doesn't do near as much stuff as a flash tune does, but for what it...
Vehicle: 2018 Si
Total tuned time: 8.5 months.
Total tuned mileage: ~10K
Tuning device(s) used: JB4
Tunes used: Have been daily on their Map 7 (+9psi, E30) since they released it, probably a month after I got the tuner.
Additional engine mods: Mishimoto intake modded for cold air...
For good reason!
They perform amazingly, and they are CHEAP. With a deal they were running when I had them installed I was out the door for $600 with all four mounted/balanced/alignment checked/road hazard warranty.
Long story short, I needed new tires and last week had Firestone Firehawk Indy 500s installed.
Y'all, I knew the stock all seasons were bad, but did you guys know HOW BAD they are?
Sweet Lord, this is a whole new car. Did y'all have any idea how WELL these things can handle? Whew lad...