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

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Old 02-19-2015, 08:24 PM   #1
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Dragstrip tips on stock tires

Can anyone take a look at this and give some tips besides the obvious one that apparently I'm not as good as driver that I thought I was lol. I am driver 4808b. This was my first time on a track. Despite the bad times, I had a blast and will be doing it again next month.

Current mods are CAI, long tube headers, ported TB. I could not get any traction off the line. I tried launching at different RPM's and kept getting the same result. Tires are stock with about 19,500 miles.
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Old 02-19-2015, 08:32 PM   #2
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Were you dumping the clutch? And was is just cooking or was it hooking and bogging almost down to idle? I was running a 8.279 with a 2.1 60 foot @90. On all season nitto motivos. You should be rolling the clutch out once the third light goes on then get on it.
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Old 02-19-2015, 08:33 PM   #3
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I dont see how your trapping 110 in the 1/4 while trapping 81 in the 1/8
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Old 02-19-2015, 08:38 PM   #4
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No idea what that means lol. I wasn't dumping the clutch. I found out real quick that dumping the clutch added a second to the time. I was letting the clutch out slowly which was probably burning it up. I wasn't letting the clutch go on the yellow but I don't think the time started until you passed the line.

If you look at this picture, the other car left 3 seconds after the light and ran 12.9. I crossed the finish line before him.

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I dont see how your trapping 110 in the 1/4 while trapping 81 in the 1/8
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Old 02-19-2015, 09:04 PM   #5
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Yes but you get a 1 foot roll out which makes a big difference on your 60 foot which changes youe 1/4mile by alot. .100 on the 60 foot is .200 on your 1/4 time
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Old 02-19-2015, 09:11 PM   #6
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I was running a 8.9 at 88 with 2.
4 or 2.6 60 foot once i figured out the launch it was all down hill from there.
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Old 02-19-2015, 09:13 PM   #7
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Thanks for the advice. I will try that next month.
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Old 02-19-2015, 10:04 PM   #8
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I would rev to 2500 put the clutch to where its fixing to grab and hold it. Once you're ready release the clutch and then get on the gas.that's my way and I don't spin. I have your mods plus 3.91's on nitto invos
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Old 02-19-2015, 10:14 PM   #9
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That is pretty much exactly what I was doing except I had to ride the clutch to keep tires from spinning so bad. I have the stock Pirelli tires. What is your average time? Being we have the same mods besides the gears, what should my average time be?


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I would rev to 2500 put the clutch to where its fixing to grab and hold it. Once you're ready release the clutch and then get on the gas.that's my way and I don't spin. I have your mods plus 3.91's on nitto invos
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Old 02-20-2015, 12:22 AM   #10
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I'll probably go tomorrow to try to break my pb. So far my best is 12.7@114 with a 2.2 60'
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Old 02-20-2015, 12:25 AM   #11
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I am hoping to run low 13's. If I get better on the launch, I should have no problem. I am ending the quarter mile at 109-110 MPH.
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Old 02-20-2015, 12:31 AM   #12
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Idk why you are still spinning if you're launching like me. Maybe a little slower on the clutch and don't on the gas until you are moving and not spinning. Practice. Know your sweet spot.
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Old 02-20-2015, 02:05 AM   #13
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Quote:
Originally Posted by j.curt View Post
Can anyone take a look at this and give some tips besides the obvious one that apparently I'm not as good as driver that I thought I was lol. I am driver 4808b. This was my first time on a track. Despite the bad times, I had a blast and will be doing it again next month.

Current mods are CAI, long tube headers, ported TB. I could not get any traction off the line. I tried launching at different RPM's and kept getting the same result. Tires are stock with about 19,500 miles.
I have same mods minus ported TB. my best time has been a 12.9 @113. cut a 1.9 60' but it was pretty hot out.Basically our cars are a Pain too launch best way is seat time. Especially us M6 guys. air the tires down to 24 psi and work your way down until you get a decent launch. for me it's 22psi. we have very low fluid pressure so our cars don't like slipping the clutch, it sticks to ground, however thats the best way to do it. don't launch at anything over 2.8k or your clutch will stick immediately. Go around the water box and back in until the rear of your back tires barely touch the water. you want to clean them off so a quick burnout 5 seconds tops and let it go. Pull up to the 1st set of lights. (tricky part now) either get a 2 step or watch your rpms. bring them up to 2.2-2.5k. inch forward to next set of lights, however press the clutch just to the point before it starts to grab. so maybe 3/4 7/8 the way down. after the tree drops on last yellow release majority of clutch but leave about 25% engage. you will feel the car leap forward with little wheelspin. once it hooks let the rest go and roll into the throttle. don't shift to high on the 1-2 because the 2nd gear spin slows you down. maybe 6.2k. 2-3 and on shift however you want. I learned most of this from the ranger acceleration techniques. with practice you get better. Lastly, don't race the next guy, always tell your self you are racing yourself if not you will miss gears lol.

[IMG][/IMG]

also look at trailing arms and toe rods. need to adress our wheelhop issue 1st. cheap and inexpensive mods that do a ton for our suspension.
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Old 02-20-2015, 02:55 AM   #14
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So basically the 60' time is the make or break time. I'm getting the speed at the end but the 60' time is horrible. I was averaging mid to high 2's. If I can get this time to a low 2 or high 1, I should be able to run low 13's.
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Old 02-20-2015, 07:54 AM   #15
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Take an air compressor and drop tire pressure to 24-26 psi. Play with your rpm's from 1500-2500 and get aggressive with the clutch. You can get 1.6x on the 20" p-zeros once you get used to what the clutch likes.


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Old 02-21-2015, 01:00 AM   #16
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Well I went tonight. I dropped tire psi to 22. My best was a 12.6@114 with a 2.0 60ft
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Old 02-21-2015, 01:17 AM   #17
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That broke the 12.7. Good job. How many runs did you do and what was your average? Does dropping the tire psi make that big of difference? What mods do you have on the car?


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Well I went tonight. I dropped tire psi to 22. My best was a 12.6@114 with a 2.0 60ft
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Old 02-21-2015, 01:45 AM   #18
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Can you explain the 2 step. I looked at the newbs sticky and couldn't find it there. Thanks

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Originally Posted by mongooseboy000 View Post
I have same mods minus ported TB. my best time has been a 12.9 @113. cut a 1.9 60' but it was pretty hot out.Basically our cars are a Pain too launch best way is seat time. Especially us M6 guys. air the tires down to 24 psi and work your way down until you get a decent launch. for me it's 22psi. we have very low fluid pressure so our cars don't like slipping the clutch, it sticks to ground, however thats the best way to do it. don't launch at anything over 2.8k or your clutch will stick immediately. Go around the water box and back in until the rear of your back tires barely touch the water. you want to clean them off so a quick burnout 5 seconds tops and let it go. Pull up to the 1st set of lights. (tricky part now) either get a 2 step or watch your rpms. bring them up to 2.2-2.5k. inch forward to next set of lights, however press the clutch just to the point before it starts to grab. so maybe 3/4 7/8 the way down. after the tree drops on last yellow release majority of clutch but leave about 25% engage. you will feel the car leap forward with little wheelspin. once it hooks let the rest go and roll into the throttle. don't shift to high on the 1-2 because the 2nd gear spin slows you down. maybe 6.2k. 2-3 and on shift however you want. I learned most of this from the ranger acceleration techniques. with practice you get better. Lastly, don't race the next guy, always tell your self you are racing yourself if not you will miss gears lol.

[IMG][/IMG]

also look at trailing arms and toe rods. need to adress our wheelhop issue 1st. cheap and inexpensive mods that do a ton for our suspension.
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Old 02-21-2015, 03:13 AM   #19
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Quote:
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That broke the 12.7. Good job. How many runs did you do and what was your average? Does dropping the tire psi make that big of difference? What mods do you have on the car?
Mine is a ls3 m6. I have Lt headers, intake with scoop, bo's ported tb, 3.91's with true trac, trailing arms 1" lowering springs. I think that's it. Its on a mail order tune. Yes tire pressure helps a lot. Back then I couldn't get traction at all even when I was stock, I lowered the psi to 22 and it felt like I swapped tires for dr's
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Old 02-21-2015, 11:54 PM   #20
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Are you doing a big burn out? The pirelli pzero need just a slight hazing of the tires. Clutch slip and loading the suspension slighlty with the ebrake. Check my '60 foot time on the leader board for stock tires and m6. On of the best ever
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Old 02-22-2015, 01:17 AM   #21
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Are you doing a big burn out? The pirelli pzero need just a slight hazing of the tires. Clutch slip and loading the suspension slighlty with the ebrake. Check my '60 foot time on the leader board for stock tires and m6. On of the best ever

I tried a couple times without doing a burnout at all which happened to be my best times and then I also tried doing a very small burnout but not going into the water box. I did not try the ebrake.

My next time out I am going to go on the third yellow like people have been saying and going to play with different tire psi. If I find out what the 2 step is, I will try that as well.
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Old 02-22-2015, 06:22 AM   #22
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I tried a couple times without doing a burnout at all which happened to be my best times and then I also tried doing a very small burnout but not going into the water box. I did not try the ebrake.

My next time out I am going to go on the third yellow like people have been saying and going to play with different tire psi. If I find out what the 2 step is, I will try that as well.

Two step allows you to mash the gas but your RPMs don't go over what you set it at until you get to a preset speed, then it is out of the system and your car revs like normal. I'm adding one shortly because it takes the pressure off you to keep your RPMs stable and exactly where you want them.

Be careful going too low on tire pressure or your tire will spin on the rim. Put window chalk on your rim and tire and if the mark moves, you've gone too low.


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Old 02-22-2015, 07:18 PM   #23
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Thanks. My plan is to get tuned the weekend before I go down to race and then I will start at 30 PSI and slowly go down from there.


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Two step allows you to mash the gas but your RPMs don't go over what you set it at until you get to a preset speed, then it is out of the system and your car revs like normal. I'm adding one shortly because it takes the pressure off you to keep your RPMs stable and exactly where you want them.

Be careful going too low on tire pressure or your tire will spin on the rim. Put window chalk on your rim and tire and if the mark moves, you've gone too low.


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Old 02-24-2015, 02:20 AM   #24
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Thanks. My plan is to get tuned the weekend before I go down to race and then I will start at 30 PSI and slowly go down from there.

30 is a bit high. I'd start at 28 and do a quick spin to clean them off, not a burnout.




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Old 02-25-2015, 05:59 PM   #25
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I ran my Pirelli's between 30-32 with great success. Street tires are made to perform their best at the recommended psi. Start lowering them too much and they begin "cupping". I'm thinking your problem is technique, not improper tire pressure.
Just my $.02, but what do I know?
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