Video from the track...
11-21-2009, 11:06 PM
#1
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Video from the track...
In car of previous 11.24 pass w/o bigger injectors. They had some problems with the lights and I rushed the launch, spun some but still cut a 1.60. Looking for any pointers for that 10sec slip, shift light is set at 6700 and rev limiter at 6800. http://www.youtube.com/watch?v=tlvrwzLX_sc
11-22-2009, 08:04 AM
#2
Le Mans Master
In car of previous 11.24 pass w/o bigger injectors. They had some problems with the lights and I rushed the launch, spun some but still cut a 1.60. Looking for any pointers for that 10sec slip, shift light is set at 6700 and rev limiter at 6800. http://www.youtube.com/watch?v=tlvrwzLX_sc
We really need an outside shot of the car. Any outside vids?
Take your time more too. Hold the rpms at some given point for a few swconds so you can figure out exactly what rpm works for that particular day/track/prep.
The rev limiter should be 2-300rpms above shift light.
If you can and it's safe I would shift around 7000rpms.
Not sure of your mods either.
11-22-2009, 08:54 AM
#3
Drifting
The 1-2 shift is the the most difficult to time. It climbs so quickly you need more time to react than 100rpm. I set mine at 300rpm less. For the 1-2, as soon as I see the light, I shift fast. For the 2-3, I wait about a 1/2 second before I shift. For the 3-4, I wait about a second or so to shift.
What tires? Clutch?
11-22-2009, 11:24 AM
#4
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1) Definitely raise the limiter to 7K as Rob stated.
2) Your shift points on the 2-3 and 3-4 appear a little low looking at your tach. This may be misleading. You may want to log your car during your passes to verify your shifts points. You should see the rpm climb a couple hundred as you depress the clutch on your shifts.
3) As Dave states, your 1-2 should come up very fast. I took Rob's advice and did not wait, but pulled the shift. I believe that it was near 6900. This is necessary when 1.4x 60's are required.
4) This brings me to the last point. We need to get your 60's down to a mid to high 1.4x range. Rob is the 60' guru. Tire pressure, track prep, tire type, and launch technique all must be adjusted to obtain the required results. You may be nearing the limits of the ls6 clutch at your power level. A very slight amount of slip could produce a better 60' but can be detrimental to its longevity.
As previously stated, an outside vid from the side would be very helpful.
2) Your shift points on the 2-3 and 3-4 appear a little low looking at your tach. This may be misleading. You may want to log your car during your passes to verify your shifts points. You should see the rpm climb a couple hundred as you depress the clutch on your shifts.
3) As Dave states, your 1-2 should come up very fast. I took Rob's advice and did not wait, but pulled the shift. I believe that it was near 6900. This is necessary when 1.4x 60's are required.
4) This brings me to the last point. We need to get your 60's down to a mid to high 1.4x range. Rob is the 60' guru. Tire pressure, track prep, tire type, and launch technique all must be adjusted to obtain the required results. You may be nearing the limits of the ls6 clutch at your power level. A very slight amount of slip could produce a better 60' but can be detrimental to its longevity.
As previously stated, an outside vid from the side would be very helpful.
11-23-2009, 12:41 AM
#5
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Thanks guys, the shift light was set 300rpm before limiter, but I found myself wanting to short shift, s I raised it. Remember the cam is tiny(218/230 116+2) and peaks at 6200, so I don't think pulling to 7k will gain anything.
I actually ended up going out today to regain my nuts at launching...Didn't improve ET as weather conditions weren't better and I think I need some fine tuning. Didn't have anybody to datalog this time because it was last minute, but I started out slipping the clutch from 4k resulting in a 1.7 and it sticking to the floor. I then went to 4500 with a light 1st gear burn out and spun to a 1.61 11.3@120. Then tried 5k with a 2nd gear burnout and quick release(just turned tires over enough to avoid dead hooking)cut a 1.56 again, but I hit the rev limiter in 1st and it wouldn't even go into 3rd. My buddy just happened to video it and I'll get it loaded up as soon as I can. I think I may have reached the limits of the clutch because this is on 5yr old ET streets and you'll see how "weak" the burnout is.
I actually ended up going out today to regain my nuts at launching...Didn't improve ET as weather conditions weren't better and I think I need some fine tuning. Didn't have anybody to datalog this time because it was last minute, but I started out slipping the clutch from 4k resulting in a 1.7 and it sticking to the floor. I then went to 4500 with a light 1st gear burn out and spun to a 1.61 11.3@120. Then tried 5k with a 2nd gear burnout and quick release(just turned tires over enough to avoid dead hooking)cut a 1.56 again, but I hit the rev limiter in 1st and it wouldn't even go into 3rd. My buddy just happened to video it and I'll get it loaded up as soon as I can. I think I may have reached the limits of the clutch because this is on 5yr old ET streets and you'll see how "weak" the burnout is.
11-23-2009, 07:55 PM
#7
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Yeah, it was supposed to be the fail safe to not breaking a rearend, but now that I have the hardened shaft I'm probably gonna do a clutch over the winter if it doesn't go 10's before the end of the year.
11-23-2009, 09:42 PM
#10
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LOL, I can't remember when the last time I logged on there!
11-25-2009, 09:34 PM
#12
Senior Badass!
Those are some dangerous launches. Bogging it like that will rip the rear out. Its better to spin a little than to hop it like that. Good run though.
11-26-2009, 02:04 AM
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11-26-2009, 02:08 AM
#15
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It actually spun pretty good on this run as I can't slip the clutch too much or I won't be able to shift gears cause it sticks...I normally launch just higher than necessary to keep it from dead hooking, but a bog is inevitable as I'm having to drive around the clutch...The pass after the one in the video is when I broke the stock driverside output shaft from dead hooking a slighty lower launch, but this was after 144 passes including a 1.56 60'
11-26-2009, 02:10 AM
#16
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