345s-bspinnin
Enthusiast
No boost, no N2O, no new 5th gear, no excuses. Car had a few minor issues (discussed below), but I was able to do enough runs to exceed my 190mph naturally aspirated goal.
Here are some details and lessons learned for my fellow viper friends:
So I attended the Texas Mile this last weekend in search of a 190+ run with my newly modded Heads/Cam Car. Viper is a Gen III vert with a Greg Good Heads Cam Package and an A&C Tune laying down 614whp/590wtq on a moderate 12.8:1 AF tune. More details of my build can be found in my Heads/Cam Thread (CLICK ME). Car is now making 643whp/606 with throttle body and air filters, but I was not running with the throttle body or cold air filter setup at the TX Mile.
That 191.5mph did not come easy. TX Mile has imposed a new licensing process. You must meet safety requirements and move up classes before they let you run wild. I spent all Saturday simply doing “class runs” as wait time was 3-4 hrs between runs. On Sunday I set off to attempt my first 190+ run and noticed that my AF meter went into the red (lean) once I hit 4th gear. Needless to say, I let off. It was very peculiar since none of my dyno sessions, street logs, or previous runs showed such a thing. We racked our brains and concluded that the imperfect Texas Mile runway (rolling bumps) combined with a 1/4 tank of fuel were causing the fuel basket to be depleted by a thirsty engine as the fuel sloshed around (OEM Fuel system). I drove the car out of the airfield grounds and topped it off (93 oct pump fuel). I came back in and the mystery leaning was solved.
My first actual successful full WOT run yielded a 187.8 mph, but I came back to the pit with a light haze of white smoke from under the hood
. We took a peek and noticed the passenger heat shield sprinkled with oil. It turns out that s ome oil was seeping from under my roller rocker spacer. The root of the issue was a few loose valve cover bolts that hold those aftermarket pesky wire separators (bolt through design). For some reason (heat softening plastic?) they had come loose. We tightened those wire separator bolts, cleaned up the sprinkled oil, and lined it up again. By this point, it was already a warm Sunday mid-afternoon. I drove it aggressively and hit the rev limiter on the 3/4 shift, but still managed to pull a 191.5 mph. I hot lapped it, and backed it up with a 190.5 mph pass before packing up and going home. By the way, did you guys know that the top start getting really windy after 190mph? I actually saw sunlight between the soft top and the windshield gasket area. I guess I should tape it down next time.
My fastest pass at mid-afternoon on Sunday had a DA of 1900 ft with a 7-9mph head wind. Morning conditions were much more favorable with DA at 600ft, and a 5 mph tail wind, but I unfortunately was staying off the TX Mile grounds and didn’t have anyone to come and save me a spot at 5 am :|
I spent a lot of time in the pits, and unfortunately don’t have too many general TX Mile ’12 pics. ARTs 1800 Viper ran on Friday and Saturday, and did achieve some respectable speeds. There were a few Vipers at the event. I spoke with Kyle “FrogMsr” who I believed ran a few 170.x on his modded Gen IV. There was a Gen III that ran 164mph with a K&N only. A black Gen II was running low 160s. I also witnessed the Fort GTs 257.7mph record run, followed by LMRs Camaro doing 253.XX.
I have so some data for the bench racers. The GPS (10Hz rate) seemed to lag, but this is the data I collected. You can see the big picture in the charts below. Here is the tabulated data:
Speed | Time (sec.)
0-60 | 3.8
0-100 | 6.7
0-130 | 10.5
0-150 | 15.1
60-130 | 6.7 (2 shifts)
Dist. E.T. MPH
1/8 6.7 98.2
1/4 11.3 134.6
1/2 17.8 159.5
3/4 23.1 178.6
1 27.8 191.5
Short video:
http://youtu.be/0fsIRiScANQ
Here are some details and lessons learned for my fellow viper friends:
So I attended the Texas Mile this last weekend in search of a 190+ run with my newly modded Heads/Cam Car. Viper is a Gen III vert with a Greg Good Heads Cam Package and an A&C Tune laying down 614whp/590wtq on a moderate 12.8:1 AF tune. More details of my build can be found in my Heads/Cam Thread (CLICK ME). Car is now making 643whp/606 with throttle body and air filters, but I was not running with the throttle body or cold air filter setup at the TX Mile.
That 191.5mph did not come easy. TX Mile has imposed a new licensing process. You must meet safety requirements and move up classes before they let you run wild. I spent all Saturday simply doing “class runs” as wait time was 3-4 hrs between runs. On Sunday I set off to attempt my first 190+ run and noticed that my AF meter went into the red (lean) once I hit 4th gear. Needless to say, I let off. It was very peculiar since none of my dyno sessions, street logs, or previous runs showed such a thing. We racked our brains and concluded that the imperfect Texas Mile runway (rolling bumps) combined with a 1/4 tank of fuel were causing the fuel basket to be depleted by a thirsty engine as the fuel sloshed around (OEM Fuel system). I drove the car out of the airfield grounds and topped it off (93 oct pump fuel). I came back in and the mystery leaning was solved.
My first actual successful full WOT run yielded a 187.8 mph, but I came back to the pit with a light haze of white smoke from under the hood
. We took a peek and noticed the passenger heat shield sprinkled with oil. It turns out that s ome oil was seeping from under my roller rocker spacer. The root of the issue was a few loose valve cover bolts that hold those aftermarket pesky wire separators (bolt through design). For some reason (heat softening plastic?) they had come loose. We tightened those wire separator bolts, cleaned up the sprinkled oil, and lined it up again. By this point, it was already a warm Sunday mid-afternoon. I drove it aggressively and hit the rev limiter on the 3/4 shift, but still managed to pull a 191.5 mph. I hot lapped it, and backed it up with a 190.5 mph pass before packing up and going home. By the way, did you guys know that the top start getting really windy after 190mph? I actually saw sunlight between the soft top and the windshield gasket area. I guess I should tape it down next time.My fastest pass at mid-afternoon on Sunday had a DA of 1900 ft with a 7-9mph head wind. Morning conditions were much more favorable with DA at 600ft, and a 5 mph tail wind, but I unfortunately was staying off the TX Mile grounds and didn’t have anyone to come and save me a spot at 5 am :|
I spent a lot of time in the pits, and unfortunately don’t have too many general TX Mile ’12 pics. ARTs 1800 Viper ran on Friday and Saturday, and did achieve some respectable speeds. There were a few Vipers at the event. I spoke with Kyle “FrogMsr” who I believed ran a few 170.x on his modded Gen IV. There was a Gen III that ran 164mph with a K&N only. A black Gen II was running low 160s. I also witnessed the Fort GTs 257.7mph record run, followed by LMRs Camaro doing 253.XX.
I have so some data for the bench racers. The GPS (10Hz rate) seemed to lag, but this is the data I collected. You can see the big picture in the charts below. Here is the tabulated data:
Speed | Time (sec.)
0-60 | 3.8
0-100 | 6.7
0-130 | 10.5
0-150 | 15.1
60-130 | 6.7 (2 shifts)
Dist. E.T. MPH
1/8 6.7 98.2
1/4 11.3 134.6
1/2 17.8 159.5
3/4 23.1 178.6
1 27.8 191.5
You must be registered for see images attach
You must be registered for see images attach
You must be registered for see images attach
Short video:
http://youtu.be/0fsIRiScANQ
. For the next round, I tightened my six-point harness and raised the car about 1". Those adjustments worked well for me.
