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Dragstrip and Launch Techniques Discussion 1/4 mile, 1/8 mile, launch discussions.

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Old 08-06-2009, 11:16 PM   #1
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Did I hurt my chances for better time

First time drag racer last night out at Bandimere speedway in Colorado. About 5000ft above sea level. My question is on all of my runs except 1 I ran the tack to about 5500 rpm before shifting. At that rpm I never made it to 4th gear. Since I'm as green as the day is long on this matter should I have shifted to the next gear before 5500. Car was still pulling pretty good as I past the finish line so I'm not sure. Car is bone stock 1ss.
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Old 08-06-2009, 11:22 PM   #2
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man the air is thin up there..whew..I would try some runs shifting around 58-5900rpm a few times...but then how is she breathing up there?
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Old 08-07-2009, 08:03 AM   #3
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I assume you have an LS3? And, Yes, you hurt your times significantly, considering you shifted over 1000 rpm BEFORE redline. This motor makes peak hp at 5900 rpm, you never even got there! I understand the tach is a bit lazy, particularly in first gear, but get it as close to 6600 as you can before shifting, just back it down a bit if you find you are hitting the limiter. Don't worry, you won't hurt it.
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Old 08-07-2009, 01:11 PM   #4
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I assume you have an LS3? And, Yes, you hurt your times significantly, considering you shifted over 1000 rpm BEFORE redline. This motor makes peak hp at 5900 rpm, you never even got there! I understand the tach is a bit lazy, particularly in first gear, but get it as close to 6600 as you can before shifting, just back it down a bit if you find you are hitting the limiter. Don't worry, you won't hurt it.
wow 6600, I though the limiter was at 6000 and shifting a little early not trusting the factory tac.

thanks,

BTW yes it is a LS3
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Old 08-07-2009, 01:14 PM   #5
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No air

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Originally Posted by 1320junkie View Post
man the air is thin up there..whew..I would try some runs shifting around 58-5900rpm a few times...but then how is she breathing up there?
That is one of the issues. And having the stock air cleaner in it doesn't help. I ordered the CAI Henessy has out but it has not arrived yet. I will have it by the time I get to the track again in about 3 weeks
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Old 08-07-2009, 01:15 PM   #6
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wow 6600, I though the limiter was at 6000 and shifting a little early not trusting the factory tac.

thanks,

BTW yes it is a LS3
I would just shift a little past the meat of your powerband
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Old 08-07-2009, 01:18 PM   #7
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At exactly what rpm does the limiter come in??
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Old 08-07-2009, 05:55 PM   #8
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I raced at Bandimere for over 20 years and know what you are up against with the thin air. The track is at 5800' so please don't feel bad about not matching the sea level car times. Only compare your car to other cars at Bandimere. Don't worry about sea level times.
To answer your question about rpm and an extra shift before the end of the track.
I would start off with shifting your car at 6000 at each shift since the red line is at 6600rpm. Make two runs like that then raise the shift points by 200rpm and see if it gets quicker, if it does raise it 200rpm more once you reach this point raise or lower by 100rpm. You will soon find the sweet spot where it runs the best. Since I don't have my car yet I can't say where the rev limiter comes in. Like someone else said if you do hit the rev limiter you haven't hurt the car its there to protect it and you certainly don't want to use the rev limiter as a shift point , you just lose time if you do that.

These cars are geared for 155+mph so it is not real suprizing that you never made it to fourth gear.

Your best times will be run on cool evenings at street night or test & tunes at night. If you run at Bandimere during the day in the heat of the summer the DA will reach as high as 15,000+ feet above sea level which = slower. Been there done that many times.
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Old 08-07-2009, 11:15 PM   #9
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Thanks for the info. I've been experimenting with each pass. My rev limiter I believe kicks in closer to 6000. I had it kick in 2x while I was on the road . I really wanted to know if I should have put it into 4th to get a better time. Knowing I was headed in the right direction is good to know. Ran only 5 runs taht night,on line for a 6th but the rains came. All in all I had a blast. Now I can't wait to get back there to keep improving.
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Old 08-07-2009, 11:20 PM   #10
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Old 08-07-2009, 11:23 PM   #11
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Shift after 5500 and before 6000.
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Old 08-08-2009, 07:09 AM   #12
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Quote:
Originally Posted by tom692010 View Post
Thanks for the info. I've been experimenting with each pass. My rev limiter I believe kicks in closer to 6000. I had it kick in 2x while I was on the road . I really wanted to know if I should have put it into 4th to get a better time. Knowing I was headed in the right direction is good to know. Ran only 5 runs taht night,on line for a 6th but the rains came. All in all I had a blast. Now I can't wait to get back there to keep improving.

I thought the rev limiter was 6600 rpms in the LS3s? I also thought redline was 6500 rpms?
Based on this information you should be shifting a lot higher than you are
(around 6300 rpms or so).

The L99's rev limiter is around 6200 rpms. I tap shift my A6 up around 5800 rpms. So you should be able to shift a lot higher than that with an LS3.
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Old 08-08-2009, 08:18 AM   #13
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Quote:
Originally Posted by tom692010 View Post
Thanks for the info. I've been experimenting with each pass. My rev limiter I believe kicks in closer to 6000. I had it kick in 2x while I was on the road . I really wanted to know if I should have put it into 4th to get a better time. Knowing I was headed in the right direction is good to know. Ran only 5 runs taht night,on line for a 6th but the rains came. All in all I had a blast. Now I can't wait to get back there to keep improving.
Fourth gear is very tall in this car, I would stay in 3rd as long as possible. You hit the rev limiter at the top of first gear at only 6000? I think that is just how much lag the tach has due to the faster acceleration in first gear. These should be your shiftpoints, at 6600 rpm:

1-2 54 mph
2-3 79 mph
3-4 114 mph
4-5 163 mph

Notice that 4th gear doesn't run out until over 160 mph, I think if you shift into 4th early it will definitely hurt your time and trap speed.
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Old 08-08-2009, 08:18 AM   #14
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Quote:
Originally Posted by tom692010 View Post
Thanks for the info. I've been experimenting with each pass. My rev limiter I believe kicks in closer to 6000. I had it kick in 2x while I was on the road . I really wanted to know if I should have put it into 4th to get a better time. Knowing I was headed in the right direction is good to know. Ran only 5 runs taht night,on line for a 6th but the rains came. All in all I had a blast. Now I can't wait to get back there to keep improving.
Keep experimenting with it you will get quicker.

Since I don't have my car I don't know where red line is or where the rev limiter comes in. It is suprizing to me that the rev limiter is coming in at 6000 if red line is actually at 6600.
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Old 08-09-2009, 12:19 AM   #15
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Thanks to all. Much appreciated info from all of you. I can't wait until the next time I go there. I'm going to look into seeing if I can pick up a removable shifter light indicator. I can't see me increasing my rpm's by 200 or so with out some help.
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Old 08-16-2009, 10:55 AM   #16
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Tom, Raptor makes a great sift light that can be programed to go off at whatever RPM you desire. http://www.raptorperformance.com/pro...hift_light.htm

For shifting on your car, take a look at your Dyno sheet and find where your torque curve starts to fall off, this is where you want to shift or a little after, and power shift don't granny shift.
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Old 08-16-2009, 04:28 PM   #17
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Tom, Raptor makes a great sift light that can be programed to go off at whatever RPM you desire. http://www.raptorperformance.com/pro...hift_light.htm

For shifting on your car, take a look at your Dyno sheet and find where your torque curve starts to fall off, this is where you want to shift or a little after, and power shift don't granny shift.
I like those lights, for about $100 that is pretty cool.
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Old 08-16-2009, 05:04 PM   #18
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Quote:
Originally Posted by 1320junkie View Post
I would just shift a little past the meat of your powerband
You could have gotten some better times with shifts around 6k. Are there any other tracks at a lower altitude?
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Old 08-16-2009, 05:45 PM   #19
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Tom, you should be in third gear past the finish line at Bandimere
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Old 08-26-2009, 10:44 AM   #20
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power shift

Quote:
Originally Posted by ToddSS View Post
Tom, Raptor makes a great sift light that can be programed to go off at whatever RPM you desire. http://www.raptorperformance.com/pro...hift_light.htm

For shifting on your car, take a look at your Dyno sheet and find where your torque curve starts to fall off, this is where you want to shift or a little after, and power shift don't granny shift.
By power shifting you mean don't use clutch after 1 st gear?
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Old 08-26-2009, 06:28 PM   #21
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Fourth gear is very tall in this car, I would stay in 3rd as long as possible. You hit the rev limiter at the top of first gear at only 6000? I think that is just how much lag the tach has due to the faster acceleration in first gear. These should be your shiftpoints, at 6600 rpm:

1-2 54 mph
2-3 79 mph
3-4 114 mph
4-5 163 mph

Notice that 4th gear doesn't run out until over 160 mph, I think if you shift into 4th early it will definitely hurt your time and trap speed.
nice info thanks
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Old 08-28-2009, 10:34 PM   #22
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By power shifting you mean don't use clutch after 1 st gear?
You always have to clutch. In a normal/granny shift you let off the gas when you clutch then shift and throttle back into the next gear. Power shifting is when you keep the throttle open while clutching and shifting very fast. It'll shave some time off your 1/4, but I would focus and finding your appropriate shift point first.
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