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

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Old 06-28-2013, 10:21 AM   #1
Rohdeo16
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Second time to the Strip

Hey guys, I'm just now getting around to posting about my runs because I really have some questions.

About a month ago I took my car to the drag strip for the first time and felt like I was getting a decent feel for the car. At this point the car had Stock Tires, CAI, LT Headers, PTB, and a Janetty Tune.

Granted the temps were only about 85-90 with medium amount of humidity, the best I clocked was a 12.86@110mph with a 2.2 60'. I felt there was a lot of room for improvement to possibly get into the mid-low 12's with a good launch and more practice.

Since that time, I had a cam installed (219/235 .607/.619 113LSA), 25% UD Pulley, electric exhaust cutouts, then had it re-tuned. So I thought I would definitely be hitting some low 12's and maybe even high 11's with a good 60'.

I went to the track last night, temps were around 90-95 with pretty high humidity. The best I ran was a 12.595@111.78 with a 2.066 60'. I also ran a 12.628@111.85 with a 2.129 60'. I ended up being pretty disappointed to be honest.

I know I need to work on my launch, but I definitely feel the car should be trapping more than 1 mph higher and 2 tenths faster...what do you think?

Any advice or help is certainly appreciated!
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Last edited by Rohdeo16; 06-28-2013 at 10:33 AM.
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Old 06-28-2013, 10:26 AM   #2
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Go back in the late fall. When its 50 degrees. You'll never have good times in that kind of heat. If you correct your times for a DA of 2500 it's 12.2 @ 115.
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Old 06-28-2013, 10:32 AM   #3
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You can use this link to calculate the DA on the days you raced, and then you can compare. For example if on the first outing it was 1000 DA, and this time it was 3000 DA, the old rule of thumb is that every 700 increase will slow the car down by a tenth and a mph:

http://www.dragtimes.com/da-density-...t+Weather+Data
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Old 06-28-2013, 10:37 AM   #4
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Thanks, I will have to check out that dragtimes thing. I knew that humidity and temperature would both have an effect on times but I didn't realize it would be that much.

Here's a video of the 12.595 run...I know I red lighted it and I apologize for the voices in advance lol


Last edited by Rohdeo16; 06-28-2013 at 10:52 AM. Reason: added video
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Old 06-28-2013, 11:03 AM   #5
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Quote:
Originally Posted by Pro Stock John View Post
You can use this link to calculate the DA on the days you raced, and then you can compare. For example if on the first outing it was 1000 DA, and this time it was 3000 DA, the old rule of thumb is that every 700 increase will slow the car down by a tenth and a mph:

http://www.dragtimes.com/da-density-...t+Weather+Data
I checked the DA from those two days and times when I ran and actually the DA weren't too far off. 1137 the first track run before cam and all and, 1737 yesterday.

So not much difference between the two which still makes me wonder why the addition of all those upgrades only helped by really 2 tenths.
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Old 06-28-2013, 11:10 AM   #6
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When you tuned the cam where did it peak compared to stock? The MPH tells the tale for me.
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Old 06-28-2013, 11:15 AM   #7
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To be honest, I'm not sure. I handed over the keys to the car, had the cam and pulley installed, then was told a similar cam was installed on a camaro with similar mods to mine and that they used that as a base tune, then tuned it while driving and making some WOT runs.

It was not dyno tuned so I don't have any numbers or curves to show...guess that might need to be my next step?

EDIT: there's not many shops around here I trust yet to dyno the car properly so that is why I didn't have it done initially.
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Old 06-28-2013, 11:41 AM   #8
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Your close to rhino79, if i was you I would take it to him take it to him. He is one of the best on these cars
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Old 06-28-2013, 12:41 PM   #9
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Quote:
Originally Posted by Rohdeo16 View Post
I checked the DA from those two days and times when I ran and actually the DA weren't too far off. 1137 the first track run before cam and all and, 1737 yesterday.

So not much difference between the two which still makes me wonder why the addition of all those upgrades only helped by really 2 tenths.


What track are you running at?


What time were the passes?
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Old 06-28-2013, 02:51 PM   #10
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Quote:
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What track are you running at?


What time were the passes?
I am running at Memphis Motorsports in Memphis, TN.

First set of runs before cam was on 5/25/13 at about noon to 1.

Runs after cam were 6/27 at about 9:30pm.
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Old 06-29-2013, 11:23 AM   #11
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Rhino is great with 5th gens, good guy to have go over your tune.

I think you trapped about right for bolt-ons and low for the cam. I'd think 115-118 with the cam. Either shifting low, mechanical issues, or tune issues.
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Old 06-29-2013, 07:54 PM   #12
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I'm going to try to go see him next week and see what he can do!
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Old 06-29-2013, 09:18 PM   #13
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You need 2 things! Get with Rhino to look over your tune, AND you need some tires. Your 60ft is what's killing you! A better DA will help improve the ET and Mph over what you are now, but if your just spinning, your car will never perform the way that it could. Stock tires will be your weak link.
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Old 06-30-2013, 08:13 PM   #14
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Get a proper tune and some drag radials. Then you should be in the 11's no problem.
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Old 07-01-2013, 12:12 PM   #15
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Thanks guys,

I am going to be getting with Rhino hopefully within the next week or two and we will see where the tuning is at. I knew I needed drag radials...those are also in the works right now
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Old 07-09-2013, 11:47 AM   #16
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Just a quick update...

I set up an appointment for the 17th to have Rhino tune my car. Definitely looking forward to getting everything set right.
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Old 07-09-2013, 11:55 AM   #17
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Sounds good! Rhino will take care of you.
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Old 07-09-2013, 02:06 PM   #18
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My experience is somewhat the same I think

In February of this year I went while the DA was 559 and ran a 12.426 @ 114.33 with cam, ported heads, ported intake, ported TB, 1 3/4 headers, and stock coverter.

I went back in June with a DA of 2699 with everything listed above except with 1 7/8 headers and circle d 3200 stall and ran 12.618 @ 111.18

It sucked. I have lighter wheels and drag radials on the way but still don't expect extraordinary results right now.

Fall will be here before you know it.
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Old 07-09-2013, 04:08 PM   #19
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Same and different I would say. Rohdeo's MPH seems low to me, and he's an M6 guy. So I don't know if he tried different shift points making sure he maxed out his combo. Conventional wisdom is to shift at or slightly after peak HP. IMO it's easy to experiment, since the driver decides when to shift. Sometimes low MPH is simply from shifting at too low an RPM.

For an A6 L99 guy, it can be the same problem but it takes more work to fix. I think Jeff's MPH for his combo is super low, though if he spun like a madman that will affect the MPH. I think the MPH can then end up being low, my theory is that is that when I spin a lot my car shifts 1-2 and 2-3 real fast and I end up spending time in higher less torque'y gears (that's my theory). But I don't have heads and cam and even when I would spin I ran the same MPH as yours. So I wonder if your shift points also need work. I'm finding that getting shift points right after a converter might take one or two tries.
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Old 07-09-2013, 04:58 PM   #20
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When I made my last two runs (the two time slips above) I actually bounced off the rev limiter just a tad before shifting into 4th on the 12.628 run. On the other run (12.595 and the video above) I actually shifted a little earlier to get into 4th to see what it would do and if it would give me a little better time as opposed to shifting literally right before the end.

I felt like I was shifting pretty high to 2nd and 3rd, but I really didn't pay too much attention to the RPM's. To be honest, I think another part of my time issue is that the limiter wasn't adjusted at all when the cam was installed but without seeing a dyno slip it's hard to say where the power curve stops at or where I'm making my power.

Jeff, drag radials should help, I am working right now on a deal for some 18" z06 replica wheels and some nt05r's...hopefully I'll be hooking up much better soon.
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Old 07-09-2013, 05:06 PM   #21
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I went a different direction on wheels. The replicas are around 24 lbs the wheels I found are a little lighter. I did however decide to go with Nitto NT-05R drag radials. Good luck at the track.

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Old 07-09-2013, 05:26 PM   #22
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Rohdeo, look at Bad70Supreme, he's got a cam kinda like that and he's gone 12.3@115 or 116 MPH.
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Old 07-17-2013, 02:40 PM   #23
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Well guys, I just got back home from driving out to have Rhino tune my car.

All I can say is that if you need a tuner he's the man to go to. It was about 150 miles out there and then another 150 back but it was worth every bit of it.

He talked to me through the whole process, told me what was going on while he was tuning and came out with some great results.

He took my car that was supposed to have been tuned from 443 hp and 412 tq and raised those numbers to 464 hp and 435 tq. That's a 21 hp and 23 tq increase... I'm definitely glad I had him look at it.

Anyway I'm ready for another trip to the strip to see what she can do but I do plan on waiting till a cooler day. Hopefully I see some more improvements in my times!
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Old 07-17-2013, 10:08 PM   #24
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Outstanding, keep us posted!
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Old 07-24-2013, 08:13 AM   #25
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Try staging shallower and leaving on the last yellow or just as it turns off. gives you a better 60 and more top end. At least thats what I do...
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