Just got back from the track. It went pretty well... about what I was expecting/hoping for. Had the Caltrac's set the same as last season. Still running the 5 year old MT slicks.
Made 3 partial passes to test the 60 foot times and try and dial in the tire pressure.
First full pass came in at a 10.580 at 122.71 mph with a 1.451 60 foot time.
Second pass came in at a 10.562 at 125.33 mph with a 1.488 60 foot time.
Third full pass came in at a 10.563 at 125.43 mph with a 1.455 60 foot time.
The first full pass was run at 10 psi, 2 step at 4500 rpm, and I ran into the rev limiter lowering the mph. The second pass, 2 step at 4800 rpm, more tire spin off line, but didn't hit the limiter. It went into valve float at 7500 rpm. The third pass down to 9 psi, 2 step at 4800 rpm, less tire spin, but the rpm ran into valve float again at 7500 rpm. Way higher than the engine makes its power peak. The slicks are so hard that I had to keep lowering pressure down to 9 psi, and they still spun somewhat off the line and got squirrelly at the 1-2 shift.
Last season with less horsepower and less stall speed (3500 rpm), it hooked and pulled the front up pretty good. This season the front comes up, but not as much as last year because it it not hooking hard.
Any idea's as to why it's spinning so high on RPM's? It has 4.30 gears, currently running 28x10.50 slicks. I figured it would trap at about 7200 rpm with a higher mph. The engine makes peak HP at 6600-6700. I know if I can get the rpm down into the power band it will probably ET & MPH higher. How can I tell if I'm "blowing" through the converter? It has a new 8" converter from PTC with a 5300 rpm stall on the brake.
I think I'm going to have to go with a larger diameter slick to get the rpm's down. Probably move to a 29.5 - 30" slick.
Here are a couple of videos showing the last two runs. My friend was having problems with my camera. He got most of the runs, but shut it off just before the et showed on the boards. He did make a nice 3 1/2 minute video of the ground as he was walking around the pits. LOL
http://www.youtube.com/watch?v=use7C...eature=channel
http://www.youtube.com/watch?v=zHhqGXheKGM
Jeff
Made 3 partial passes to test the 60 foot times and try and dial in the tire pressure.
First full pass came in at a 10.580 at 122.71 mph with a 1.451 60 foot time.
Second pass came in at a 10.562 at 125.33 mph with a 1.488 60 foot time.
Third full pass came in at a 10.563 at 125.43 mph with a 1.455 60 foot time.
The first full pass was run at 10 psi, 2 step at 4500 rpm, and I ran into the rev limiter lowering the mph. The second pass, 2 step at 4800 rpm, more tire spin off line, but didn't hit the limiter. It went into valve float at 7500 rpm. The third pass down to 9 psi, 2 step at 4800 rpm, less tire spin, but the rpm ran into valve float again at 7500 rpm. Way higher than the engine makes its power peak. The slicks are so hard that I had to keep lowering pressure down to 9 psi, and they still spun somewhat off the line and got squirrelly at the 1-2 shift.
Last season with less horsepower and less stall speed (3500 rpm), it hooked and pulled the front up pretty good. This season the front comes up, but not as much as last year because it it not hooking hard.
Any idea's as to why it's spinning so high on RPM's? It has 4.30 gears, currently running 28x10.50 slicks. I figured it would trap at about 7200 rpm with a higher mph. The engine makes peak HP at 6600-6700. I know if I can get the rpm down into the power band it will probably ET & MPH higher. How can I tell if I'm "blowing" through the converter? It has a new 8" converter from PTC with a 5300 rpm stall on the brake.
I think I'm going to have to go with a larger diameter slick to get the rpm's down. Probably move to a 29.5 - 30" slick.
Here are a couple of videos showing the last two runs. My friend was having problems with my camera. He got most of the runs, but shut it off just before the et showed on the boards. He did make a nice 3 1/2 minute video of the ground as he was walking around the pits. LOL
http://www.youtube.com/watch?v=use7C...eature=channel
http://www.youtube.com/watch?v=zHhqGXheKGM
Jeff