Supposed to go in the morning but my wife filled the tank with Rec 90 this afternoon. Argghh! Not sure what I'm going to do now.
Headed out onto the highway early this morning for the track. Put the truck in M4 and spun up 3,330 rpms @ 70 mph. Timing was 40 degrees. Engine load was 40% and in an hour she burned over 6 gallons. I floored it once and immediately pulled 6.5 degrees timing from knock. Pulled into RaceTrac and took on almost seven gallons of E85. Alcohol content settled at 20% later on. Truck weighed 6380 with me in it at the CAT Scale 24 miles from the track.
Apparently, I wasn't the only one who wanted to go racing this morning. At 9 am I was 1/4 mile from the entrance parked in the median on the highway. 45 minutes later I was through tech inspection and parked in the lanes ready to race.
Track was sticky. First launch felt great, no motor lag like before. Idle Launched in 4WD and back into RWD by the end of the 60-foot. To make a long story short, the truck ran about the same times as she did in January, same weight, but was faster through the traps, making over 325 rear wheel horsepower. She accomplished the coveted 1 horsepower per cubic inch! Love my
@BlackBearPerf tune!
After the second run the pits were really filling up with cars now and I decided to call it day. I was tired from little sleep due to the dogs barking all night and didn't want to wait 2 hours for the next run. Both runs recorded 6 degrees of KR. Not enough E85 to offset that crap Rec90.
On the way home I made some observations. At 65 mph she was getting 19 mpg. At 70 mph she was getting 18.7 mpg with a 50% load. At 77 mph she was getting 18.2 mpg and running about a 55% load. These are not 2-way averages, just heading home.
I've another 4 hour run to make in an hour or so to pick up a wayward relative from a distant airport and may make some more observations.
I'm on the right lane both times. Time is off by an hour.
At 6380 pounds with me in it, the cab is empty. All of my towing and recovery gear was out, the consoles had the bare minimum of stuff in them compared to normal. She was probably 100-125 pounds lighter than normal. Guess I'm not sure how much that new axle added to the weight of the truck.
Could the additional weight have negated the performance advantage of the 3.73 gear off the line? Have to make some more runs next year.
Sorry Lord, I know I should've been in church this morning!
