[Z06] bogged launch effect trap speed
Thread Starter
Racer
Joined: Feb 2007
Posts: 299
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bogged launch effect trap speed
went out to the track last night and bogged my launch (2.3 60') and the car trapped 110mph, just wondering if a better launch would bring the mph up where it should be 114-115
thanks
thanks
Thread Starter
Racer
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Race Director
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From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
A 2.3 60' usually is due to spinning on your launch, which usually yields falsely higher MPH's.
You must have bogged REAL badly.
Launch alone will not dictate MPH. Equally important are shift points & speed of each shift.
What rpm were you launching at, & did you slip the clutch or dump it?
You need to slip the clutch as you gradually, but quickly, go down on the gas. Doing both out of synch can cause either a bog or wheelspin on the launch. Shift all shifts as close as you can to 6500 rpm's, & REAL FAST! When done fast, your shifts should sound almost like the car is an automatic!
Keep at it! Practice makes perfect!
Ron
Thread Starter
Racer
Joined: Feb 2007
Posts: 299
Likes: 44
Better 60' times tend to yield LOWER MPH's.
A 2.3 60' usually is due to spinning on your launch, which usually yields falsely higher MPH's.
You must have bogged REAL badly.
Launch alone will not dictate MPH. Equally important are shift points & speed of each shift.
What rpm were you launching at, & did you slip the clutch or dump it?
You need to slip the clutch as you gradually, but quickly, go down on the gas. Doing both out of synch can cause either a bog or wheelspin on the launch. Shift all shifts as close as you can to 6500 rpm's, & REAL FAST! When done fast, your shifts should sound almost like the car is an automatic!
Keep at it! Practice makes perfect!
Ron
A 2.3 60' usually is due to spinning on your launch, which usually yields falsely higher MPH's.
You must have bogged REAL badly.
Launch alone will not dictate MPH. Equally important are shift points & speed of each shift.
What rpm were you launching at, & did you slip the clutch or dump it?
You need to slip the clutch as you gradually, but quickly, go down on the gas. Doing both out of synch can cause either a bog or wheelspin on the launch. Shift all shifts as close as you can to 6500 rpm's, & REAL FAST! When done fast, your shifts should sound almost like the car is an automatic!
Keep at it! Practice makes perfect!
Ron
Le Mans Master
Joined: Jun 2003
Posts: 9,251
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From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
Yes, I know you bogged. The spin part was for informational purposes only.
You either came off the clutch too fast, went down on the gas too slowly, or both.
You should/could trap 116-119, depending on weather & driver abilities/performance.
Even if you do a 2.0 60' you should shave .45 off your ET!
Ron
You either came off the clutch too fast, went down on the gas too slowly, or both.
You should/could trap 116-119, depending on weather & driver abilities/performance.
Even if you do a 2.0 60' you should shave .45 off your ET!
Ron
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Slow shifting could easily accomodate for a 110 mph trap speed as well. If you brushed the rev limiter at all, that will also not help. Drag racing takes an awful lot of practice to get it all right!
Race Director
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From: Central Florida
Trap speeds at the 660' and the 1320' are directly related to how well the pass is driven. Highest traps always occur with the greatest proportion of the run
(1) performed with the clutch out (fast shifts)
(2) at the highest average horsepower delivered to the rear wheels (shift points correctness)
(3) power hooked at the rear wheels
Weather is also a factor. But the driving is deterministic.
Ranger
(1) performed with the clutch out (fast shifts)
(2) at the highest average horsepower delivered to the rear wheels (shift points correctness)
(3) power hooked at the rear wheels
Weather is also a factor. But the driving is deterministic.
Ranger
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Could you explain this "bog" phenomenon to a neophyte like me? The other day I mashed the gas pedal hard and fast from about a 15 MPH roll. I thought I felt for the lack of a better term "turbo lag". It lasted a couple seconds then the car took off like a shot. I looked in the rear view and saw a cloud of tire smoke. I am by the way bone stock.
Race Director
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From: Central Florida
Hi Quick Silver Z.
Assuming you had the clutch out when you hammered the gas, the delay you sensed was likely the temporary invocation of Traction Control, and the smoke you saw was from wheel spin before and after TC intervened.
The bog addressed in the lead post is different. That bog comes when the clutch is release at an elevated "launch rpm," say 2500, but the traction of the prepared surface gives such good traction that the tires hook immediately and the engine rpm is drawn down.
Instead of the engine rpms climbing rapidly, they drop by say 600-1000 as the clutch slips to equalize the speed difference between the flywheel (engine rpm) and the rear tires. That's the "bogged launch."
An ideal launch rpm will see the rear tires spin a bit, the wheels then immediately hook, and the engine rpms explode upward. That's referred to as a "strong launch."
Ranger
Assuming you had the clutch out when you hammered the gas, the delay you sensed was likely the temporary invocation of Traction Control, and the smoke you saw was from wheel spin before and after TC intervened.
The bog addressed in the lead post is different. That bog comes when the clutch is release at an elevated "launch rpm," say 2500, but the traction of the prepared surface gives such good traction that the tires hook immediately and the engine rpm is drawn down.
Instead of the engine rpms climbing rapidly, they drop by say 600-1000 as the clutch slips to equalize the speed difference between the flywheel (engine rpm) and the rear tires. That's the "bogged launch."
An ideal launch rpm will see the rear tires spin a bit, the wheels then immediately hook, and the engine rpms explode upward. That's referred to as a "strong launch."
Ranger
Thread Starter
Racer
Joined: Feb 2007
Posts: 299
Likes: 44
Hi Quick Silver Z.
Assuming you had the clutch out when you hammered the gas, the delay you sensed was likely the temporary invocation of Traction Control, and the smoke you saw was from wheel spin before and after TC intervened.
The bog addressed in the lead post is different. That bog comes when the clutch is release at an elevated "launch rpm," say 2500, but the traction of the prepared surface gives such good traction that the tires hook immediately and the engine rpm is drawn down.
Instead of the engine rpms climbing rapidly, they drop by say 600-1000 as the clutch slips to equalize the speed difference between the flywheel (engine rpm) and the rear tires. That's the "bogged launch."
An ideal launch rpm will see the rear tires spin a bit, the wheels then immediately hook, and the engine rpms explode upward. That's referred to as a "strong launch."
Ranger
Assuming you had the clutch out when you hammered the gas, the delay you sensed was likely the temporary invocation of Traction Control, and the smoke you saw was from wheel spin before and after TC intervened.
The bog addressed in the lead post is different. That bog comes when the clutch is release at an elevated "launch rpm," say 2500, but the traction of the prepared surface gives such good traction that the tires hook immediately and the engine rpm is drawn down.
Instead of the engine rpms climbing rapidly, they drop by say 600-1000 as the clutch slips to equalize the speed difference between the flywheel (engine rpm) and the rear tires. That's the "bogged launch."
An ideal launch rpm will see the rear tires spin a bit, the wheels then immediately hook, and the engine rpms explode upward. That's referred to as a "strong launch."
Ranger
Race Director
Joined: Aug 2000
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From: Central Florida
If you are seeking to set personal records, manage your temperatures to ensure the coolant is 190-195. You do that by cooling the car between passes and keeping track of the coolant temp in the DIC.
My fast times in the C5Z were run at a coolant temp of 190-194. My car did not like temps lower than that.
Ranger
Le Mans Master
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From: Kendall Park NJ
distinctdev,
I suggest that you read Ranger's launch techniques as well as shifting drills then practice, practice, practice. You can also take any advice that Dr. Ron has to offer. Their techniques are somewhat different but the results are similiar. They are both extremely fast. I had the opportunity to witness their driving skills at an Atco track rental. Both of them are impressive. I have cut 0.3 seconds off my 60' times and 1.3 seconds off my E.T. from my first passes; however, this took a great amount of reading and practice. Best of luck. I'm sure you will meet your expectations.
Dr. Ron,
How are you enjoying your C6Z? Will you be coming out to either Raceway Park or Atco?
Ranger,
Congrats again on your new record. I never did figure out that fan relay with the jumper wire. I still push my car to the line. Will you be coming back to Jersey anytime soon for a rental or be staying down in Maryland?
I suggest that you read Ranger's launch techniques as well as shifting drills then practice, practice, practice. You can also take any advice that Dr. Ron has to offer. Their techniques are somewhat different but the results are similiar. They are both extremely fast. I had the opportunity to witness their driving skills at an Atco track rental. Both of them are impressive. I have cut 0.3 seconds off my 60' times and 1.3 seconds off my E.T. from my first passes; however, this took a great amount of reading and practice. Best of luck. I'm sure you will meet your expectations.
Dr. Ron,
How are you enjoying your C6Z? Will you be coming out to either Raceway Park or Atco?
Ranger,
Congrats again on your new record. I never did figure out that fan relay with the jumper wire. I still push my car to the line. Will you be coming back to Jersey anytime soon for a rental or be staying down in Maryland?
Last edited by GARY2004Z06; Apr 7, 2007 at 12:02 PM.
Race Director
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From: Central Florida
I'm sticking close to home and doing rentals at MIR, filming segments my DVD. Perhaps a Atco rental in the fall.
Ranger
Le Mans Master
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Posts: 7,052
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From: Kendall Park NJ
