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

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Old 06-22-2013, 09:08 AM   #1
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2nd time to the track... Better but not good

So I posted last month my times for my first time to the dragstrip. I took everyone's advice and made some changes. All I was concerned with last night was 60 ft times. My first time out I couldn't get better than 2.2-2.3. So last night I dropped the tire pressure to 20lbs and did longer burnouts and was able to cut consistent 2.0 60fts. So it's better but not where I think I should be. Anyone have anymore advice for me to get sub 2.0 60? Tires are 315 DR's and M6 trans. 3.91 gears. (20 inch rims) thanks
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Old 06-22-2013, 11:58 AM   #2
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Bogging or spinning?
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Old 06-22-2013, 12:20 PM   #3
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Bogging or spinning?
+1 also, any wheel hop?
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Old 06-22-2013, 03:09 PM   #4
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No wheel hop. I was getting the 2.0 spinning. When it bogged I was 2.1-2.3.
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Old 06-22-2013, 03:50 PM   #5
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Ride that clutch out my friend. With 20's it's the only way you will do it. So hopefully you have a beefy clutch.

I would honestly recommend dropping the 20's and getting a set of 18's with radials.
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Old 06-22-2013, 07:18 PM   #6
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Ride that clutch out my friend. With 20's it's the only way you will do it. So hopefully you have a beefy clutch.

I would honestly recommend dropping the 20's and getting a set of 18's with radials.
^ yep! Ride or die!
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Old 06-22-2013, 08:38 PM   #7
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^ yep! Ride or die!
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Ride that clutch out my friend. With 20's it's the only way you will do it. So hopefully you have a beefy clutch.

I would honestly recommend dropping the 20's and getting a set of 18's with radials.
All truth here. Slipping is an art and takes some time to get it down. Seat time is your friend.

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Old 06-22-2013, 08:56 PM   #8
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What RPM are you leaving at? I just got DRs on 18s and it took me 6 passes before I figured out what I was doing wrong! My car was bogging or I was letting off the clutch to fast, what worked on my last 2 passes was 5k rpms and a quick slip of the clutch, I ran 1.80 60ft but missed a gear and blew the run!!! Tried it agian and pulled 1.87... Lucky you have 3.91s so you may only need 4000-4500 to do this.
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Old 06-22-2013, 09:55 PM   #9
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5k!! No way I could do that. I was leaving closer to 2500 - 3000. From the responses it seems I need to ride the clutch more. Even better get smaller rims and more tire. I'm going back this Friday so I'll give it a shot.
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Old 06-22-2013, 10:01 PM   #10
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Yeah, a 5k launch will destroy your stock clutch quick. I'd say at most 3500. But play around, blufin nailed it. Just takes seat time.

sent from my galaxy s3. that would explain the errors.
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Old 06-22-2013, 11:23 PM   #11
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I have a RPS twin carbon clutch. The clutch is great and can take the abuse but launching at 5k seems crazy when I'm spinning at 3k
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Old 06-23-2013, 01:16 AM   #12
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I was able to cut a 1.93 on the stock Pirelli's (28 psi) launching at 2k and quickly slipping the clutch as the loud pedal got closer to the floor.

What Dr's are you using?


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Old 06-23-2013, 01:47 AM   #13
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With those DR's you should be getting 1.6-1.7's all day long.
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Old 06-23-2013, 10:26 AM   #14
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i can cut 1.8 on the stock tire . almost every time. took lots of practice to learn what the car wants tho. dont just keep tryin the same thing over and over try different stuff. but most likely uneed to slip a lil more and less gas then start working ur way up on the gas . is the track known for having good prep. That could be ur problem.
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Old 06-23-2013, 04:19 PM   #15
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Great advice guys thanks for the help! I'll try that next weekend.
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Old 06-23-2013, 04:28 PM   #16
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Forgot to answer your questions. DR's are nitto 05R's. And as far as track prep I couldn't tell you. I'm too new to know the difference. I've only been twice. Another bit of info is the car has just over 700rwhp. Thanks
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Old 06-23-2013, 04:28 PM   #17
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I've watched XJer slip his clutch, don't recall the brand, a bunch of times. He's been able to slip it out longer than I thought was possible and it works and doesn't stink up.

I'd try 4000, slipping it, the gear should help you not need to slip it as much.
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Old 06-23-2013, 05:47 PM   #18
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I've watched XJer slip his clutch, don't recall the brand, a bunch of times. He's been able to slip it out longer than I thought was possible and it works and doesn't stick up.

I'd try 4000, slipping it, the gear should help you not need to slip it as much.
I have a McLeod RXT Twin Disc clutch and was launching around 5000rpm, so they can take a little bit higher RPM when it comes to riding the clutch out. But if its stock dont go anywhere near that high. It will destroy a stock clutch.
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Old 06-23-2013, 07:26 PM   #19
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Why, my clutch grabs hard and actually seemed to be easier on the car! At 3500 the only way it would work is slip the hell out of the clutch, personally I think that's going to kill the clutch allot faster! Good luck but sorry 2500-3000 is not going to get you anywhere, not in this car! You want good times you have to run them hard, that's all there is too it. If your blown making allot of power then lower rpms might work, but never gonna happen with a cammed car. The gear should help with launch rpms, try 4k and work your way up, trust me on this! If you can't handle trying this then don't expect your times to drop.
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Old 06-23-2013, 09:03 PM   #20
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Supreme, thanks for the advice. The car is blown making just over 700 rwhp. I have no problems trying something new / different.
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Old 06-24-2013, 07:58 AM   #21
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For some reason I was thinking your cammed only... with a blower you not going to need 5k... but I would still start at 3800-4000 and work your way up in 200 rpms at a time. I have a feeling 4000-4200 might be a good spot. Good luck man, these cars take a allot of practice to launch!
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Old 06-24-2013, 09:05 AM   #22
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For some reason I was thinking your cammed only... with a blower you not going to need 5k... but I would still start at 3800-4000 and work your way up in 200 rpms at a time. I have a feeling 4000-4200 might be a good spot. Good luck man, these cars take a allot of practice to launch!
i agree here too. Seeing as you are blown with a twin disk clutch, this sounds like a perfect start. Dont be afraid to ride it out. It seems unnatural when done right. I started trying at 3500 rpm but i would just bog, it was more difficult to ride the clutch out at that low of RPM due to the material and clamping ability of the clutch. But you have more TQ down low which should help you power through it with less RPM then me. I have to wait for the turbos to spool to get my power.

You honestly dont even need to worry about the actual 1/4 time until you get more comfortable with the launch. I stopped looking at my ET and MPH until i started seeing my 60ft in the area i needed. Usually the top half of the track is a lot easier.
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