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

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Old 07-14-2012, 11:37 AM   #1
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13.7??

Well we hit up famoso last night. The best I could come up with was a 13.7! And it was the last run of the night. I would really like to get an idea as to why is so high.

I dropped my tires down to about 25, only spun em for about one rotation just to clean them off, power braked it to about 1800...anyone have any thoughts?



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Old 07-14-2012, 11:40 AM   #2
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What is the altitude? that can make you slower

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Old 07-14-2012, 11:53 AM   #3
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Denis, there are a lot of factors involved in drag racing, as you've found out it's more than just putting it to the mat when the light turns green. Ok first of all your 60' time could be improved, you should be able to get high 1.9s on the stock tires that will come from playing with the launch. Besides that your car didn't run too bad at all. the DA at 10 pm at your track was 2727, and when you plug your numbers into the calculator, corrected you were at 13.33@107.53. Now if you can knock .15 off of your 60' time that will translate to .3 quicker in the 1/4 which would bring you down to about 13.00. That track is at a similar altitude as my home tracks so when the weather cools down and you can run in DAs under 1000 you'll see better times, but most of all like most of us seat time is what we all need more of. Here's the link to the DA calculator.
http://www.dragtimes.com/da-density-...time=9:54%20PM
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Old 07-14-2012, 11:55 AM   #4
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Also Denis, are you shifting it or are you letting the computer shift it?
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Old 07-14-2012, 12:01 PM   #5
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Letting the computer do it. And thanks for that link.

How do you get the 60's down? Just play around with launching rpm and tire pressure?
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Old 07-14-2012, 01:26 PM   #6
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Yep thats what getting the 60' times down is all about Denis. I could never get mine down below 2.0 until I went with 18" M/T drag radials, now I'm low 1.9s to mid 1.8s. It's all about practice and getting the feel for the launch. If you start getting wheel hop on the launches consider getting trailing arms and toe rods, I've got Pfadt on mine and they helped a LOT. You are correct in letting the computer do the shifting too, are you running with the traction control and stabilitrak off?
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Old 07-14-2012, 02:21 PM   #7
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I was actually looking at their trailing arms yesterday afternoon. But of the 15 runs I got in last night I really only felt wheel hop once or twice. So I don't think I really NEED them yet so I could focus elsewhere. Headers, dyno tune, drag radials....that kind of stuff.

I'm running with just traction control off. The ass end never wants to step out so I just left the stabilitrac on.
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Old 07-14-2012, 07:13 PM   #8
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Well it sounds like you're doing everything pretty well, just get more practice and try some launches with both the TC and Stabilitrak off and see how that works out. Different people and cars get different results with the controls off or on.
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Old 07-14-2012, 10:10 PM   #9
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1.8s on stock Pzeros is well within reason. Trailing arms will help alot with a good launch. Also get a little more heat in the tires.
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Old 07-15-2012, 12:10 AM   #10
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What's the Weather were you race, your MPH is way slower then it should be.
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Old 07-15-2012, 06:43 AM   #11
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Quote:
Originally Posted by Bad70supreme View Post
What's the Weather were you race, your MPH is way slower then it should be.
No time stamp on the slip.. BUT it sure was HOT that day there!

Click on the time to select your run conditions and calcuate your DA:
Time Temperature Humidity Pressure
12:54 AM 91.0 F 21 % 29.77 in
1:54 AM 89.1 F 22 % 29.77 in
2:54 AM 88.0 F 22 % 29.75 in
3:54 AM 86.0 F 25 % 29.75 in
4:54 AM 82.0 F 33 % 29.76 in
5:54 AM 84.9 F 27 % 29.78 in
6:54 AM 87.1 F 24 % 29.80 in
7:54 AM 87.1 F 26 % 29.81 in
8:54 AM 90.0 F 23 % 29.83 in
9:54 AM 93.9 F 20 % 29.82 in
10:54 AM 97.0 F 18 % 29.82 in
11:54 AM 100.9 F 17 % 29.81 in
12:54 PM 102.9 F 18 % 29.78 in
1:54 PM 102.9 F 18 % 29.76 in
2:54 PM 106.0 F 17 % 29.73 in
3:54 PM 106.0 F 16 % 29.72 in
4:54 PM 105.1 F 16 % 29.71 in
5:54 PM 102.0 F 18 % 29.70 in
6:54 PM 98.1 F 13 % 29.72 in
7:54 PM 91.9 F 18 % 29.75 in
8:54 PM 89.1 F 19 % 29.77 in
9:54 PM 86.0 F 19 % 29.80 in
10:54 PM 84.0 F 18 % 29.83 in
11:54 PM 80.1 F 20 % 29.84 in

So yeah, that could explain the trap speed!
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Old 07-15-2012, 08:01 AM   #12
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Please post full timeslip information (or give us the name of the track and time of the run) so we can calculate your Density Altitude.

I'll wait until I see that information before passing judgement. But that 103 mph trap speed scares me. But when corrected for the conditions, it will increase.

With your mods, your corrected trap speed should be around 108-109 mph.
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Old 07-15-2012, 08:16 AM   #13
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13.7 is a good solid number. What was in the other lane?
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Old 07-15-2012, 08:24 AM   #14
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13.7 is a good solid number. What was in the other lane?
Depends on when he ran...

If he ran at 4:00pm then the DA would have been about 4000'! Which would correct that 13.7 down to a 13 flat at 109 MPH... However if he ran say later, at 9:00pm then the DA was more like 2900', which would put him in the 13.3 range...
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Old 07-15-2012, 09:08 AM   #15
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Quote:
Originally Posted by scrming View Post
Depends on when he ran...

If he ran at 4:00pm then the DA would have been about 4000'! Which would correct that 13.7 down to a 13 flat at 109 MPH... However if he ran say later, at 9:00pm then the DA was more like 2900', which would put him in the 13.3 range...
If that's the case, then his time isn't all that bad.

My car with a tune ran 12.9 @ 108/109 mph in decent conditions.
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Old 07-15-2012, 09:48 AM   #16
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He did give the track in his original post....Famoso in CA
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Old 07-15-2012, 11:03 AM   #17
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Quote:
Originally Posted by formare View Post
13.7 is a good solid number. What was in the other lane?
Uptaed the original post With the full slip. That was the best run of the night at 11:41....I do blame a lot of it on the heat. So the heat coupled with a poor 60'....I was just disappointed with the time.

And the other lane was my buddies GTO. That was his best run of the night as well.
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Old 07-15-2012, 11:04 AM   #18
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Quote:
Originally Posted by DandD View Post
He did give the track in his original post....Famoso in CA
I missed that.

His said he ran at night so I took 9pm for example. Based on his time of 13.7 @ 103.97 mph

His corrected time would be
Stock and Mildly Modified Naturally Aspirated Engines
13.214 @ 107.876 MPH

Corrected for 12:00 am
Stock and Mildly Modified Naturally Aspirated Engines
13.331 @ 106.917 MPH




So his time isn't all that bad. It could be better because that's corrected for 0 density altitude - excellent conditions
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Old 07-15-2012, 11:10 AM   #19
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Corrected looks more like a 13.4.
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Old 07-15-2012, 11:13 AM   #20
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Quote:
Originally Posted by SGOS252382 View Post
I missed that.

His said he ran at night so I took 9pm for example. Based on his time of 13.7 @ 103.97 mph

His corrected time would be
Stock and Mildly Modified Naturally Aspirated Engines
13.214 @ 107.876 MPH

Corrected for 12:00 am
Stock and Mildly Modified Naturally Aspirated Engines
13.331 @ 106.917 MPH




So his time isn't all that bad. It could be better because that's corrected for 0 density altitude - excellent conditions
Do you mind If I ask what you have done to your car to get you that deep in the 12's with just 'bolt ons'?
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