I have a 2016 Challenger with 2500 miles on it which was recently modded and tuned with ANN on using e85. I have logged my Hellcat many times before the tune and my knock sensors, even on a 100% bone stock car, would report between .80 ~ 1.80v generally and sometimes up to 2.00v. I attributed this to crap gas and figured I'd worry about it after I was modded and tuned on race gas. Well I added a pulley and had it tuned on e85 and the sensors are behaving exactly the same way, indicating it's not the fuel. The voltage readings are exactly the same (maybe a touch higher) so either my e85 isn't doing it's job or the additional sound the motor/intake/exhaust is making from the added power has negated the job of the e85. My tuner told me that he "desensitized them a little bit" and it was still doing it. It was late and I decided to leave the dyno to do some street pulls and see how it behaved just in case it was isolated to that dyno only.
It was better on the street, but not cured. I figured, okay he just didn't desensitize them enough. I checked his tune last night and was horrified to find that he tripled the knock sensor threshold (~1.85v) and it is still pushing beyond that threshold and pulling a lot of timing. The thing is, it's inconsistent and some pulls there is zero timing reduction while others in the same gear it yanks as much as 7 degrees. I am at a loss right now. I know that hemis in general have a knock sensor issues, and the hellcat is supposedly worse, but I'm worried I have a bigger problem here.
The only thing I could come up with was to add another catch can. I had one on the dirty side only and now have ordered one for the clean side. I did find a small amount of oil in the intake. I think that happens after chopping the throttle quickly after a WOT pull, it blows oil mist into the intake. Not sure if this is my issue, but the can isn't here yet for me to test. Anyone know how long it takes to burn residual oil out of the intake? I probably only have 5 miles on the car with the catch cans, so maybe it's still burning that stuff off?
I've only read of others going as much as 2x the voltage threshold, I am at 3x and still can't avoid it. I will be putting the sensors back to 1.5x for safety concerns, but other than the new can I am at a loss. Any tips would be very helpful, thank you .