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

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Old 09-29-2009, 09:40 AM   #1
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Fastest L99 pass

The fatest L99 quarter time was set by us months ago 11.29 at 122.43 video attached.
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Old 09-29-2009, 10:48 AM   #2
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It sounded like the throttle was being feathered, or you lost traction at the end of the track. You can the exhaust note change. Kinda hard with the guy on the camera standing right next to a nasty big block trying to idle!

Can we get some specs on the car?
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Old 09-29-2009, 01:17 PM   #3
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Originally Posted by ARDLS1 View Post
The fatest L99 quarter time was set by us months ago 11.29 at 122.43 video attached.
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You mean quickest, I still have the FASTEST 123mph,

Thanks

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Old 09-29-2009, 01:28 PM   #4
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It sounded like the throttle was being feathered, or you lost traction at the end of the track. You can the exhaust note change. Kinda hard with the guy on the camera standing right next to a nasty big block trying to idle!

Can we get some specs on the car?
that BB sounded nasty-mean!!
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Old 09-29-2009, 03:00 PM   #5
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We have gone 126 on some slow passes, that we had wheel spin. We have a new combo to run at the LSX shootout. I will post slips with MPH it you want.
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Old 09-29-2009, 03:26 PM   #6
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It's odd how the cars run a faster mph with wheel spin, I have a pass of 11.02 @ 129 m6 car.
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Old 09-29-2009, 03:38 PM   #7
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It's odd how the cars run a faster mph with wheel spin, I have a pass of 11.02 @ 129 m6 car.
Wheelspin adds time to your run, which means more time to gain speed...you'll see the Nitro guys talk about it occasionally. None of my best mph passes came on my best et passes.
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Old 09-29-2009, 04:09 PM   #8
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Wheelspin adds time to your run, which means more time to gain speed...you'll see the Nitro guys talk about it occasionally. None of my best mph passes came on my best et passes.
Exactly
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Old 09-29-2009, 04:59 PM   #9
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Originally Posted by ARDLS1 View Post
The fatest L99 quarter time was set by us months ago 11.29 at 122.43 video attached.
Thanks

Owen
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If you have a timeslip of that run, post it in the fastest 1/4 mile thread. Also list your mods, so we can add you to the appropriate list.
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Old 09-29-2009, 05:09 PM   #10
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We have gone 126 on some slow passes, that we had wheel spin. We have a new combo to run at the LSX shootout. I will post slips with MPH it you want.
According to some people... MPH is the one that counts .
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Old 09-29-2009, 05:27 PM   #11
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According to some people... MPH is the one that counts .
MPH is representative of power, ET is representative of traction...if you were aiming that at me....MPH is my goal not ET, ET results in broken parts, and incase you are not aware, CV axles are ~$1800.
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Old 09-29-2009, 05:35 PM   #12
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If you have a timeslip of that run, post it in the fastest 1/4 mile thread. Also list your mods, so we can add you to the appropriate list.
Exactly, I posted on 9/5 in another thread asking if my runs were the fastest L99 so far, for nearly an entire month no one says anything until now. If people posted timeslips and were added like the forum requests we wouldn't have to ask...FWIW, the fastest video posted by ARD was @ 122mph....that was the exact question in my post on 9/5 asking both the quickest and fastest, hence the reason for my posts...plus the fact I thought their car was an M6.
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Old 09-29-2009, 05:55 PM   #13
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Exactly, I posted on 9/5 in another thread asking if my runs were the fastest L99 so far, for nearly an entire month no one says anything until now. If people posted timeslips and were added like the forum requests we wouldn't have to ask...FWIW, the fastest video posted by ARD was @ 122mph....that was the exact question in my post on 9/5 asking both the quickest and fastest, hence the reason for my posts...plus the fact I thought their car was an M6.
We know what you meant by fastest, and your car is badass by the way.

Nice work.
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Old 09-29-2009, 06:05 PM   #14
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MPH is representative of power, ET is representative of traction...if you were aiming that at me....MPH is my goal not ET, ET results in broken parts, and incase you are not aware, CV axles are ~$1800.
Are you planning on breaking yours and not be able to get it warrentied?
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Old 09-29-2009, 06:10 PM   #15
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just curious

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MPH is representative of power, ET is representative of traction...if you were aiming that at me....MPH is my goal not ET, ET results in broken parts, and incase you are not aware, CV axles are ~$1800.
How are you going for fastest and not putting as much stress on the cv as someone going for et. I roll off the line because Launching using the other methods isn't working for me at least.So it's not like I'm dumping the clutch. My question then is what are you doing that's not stressing the cv as much as me?
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Old 09-29-2009, 07:35 PM   #16
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Are you planning on breaking yours and not be able to get it warrentied?
Once I put that blower on there....or the cam....or maybe even the headers...my warranty went away. I know the Magnuson Moss Act, but its all up to the dealer, and lets be honest, I'm not taking my dealer to court over it. So to answer your question, no I sure don't want to break a driveline part, but if I did it would be all me.

The other question you had...look at the 60' time. A "general" rule would be the better your 60' time, the harder you are on your driveline, and the more likely your gonna break something. I never went WOT in 1st gear on really any of my passes...1/2 or 3/4 MAYBE, and I sure didn't stall the converter up very much at all, just enough to remove the slack (say 1200 rpm).

Watch this video...listen to the RPM's in first, then second, it shifts early in 1st, and see how easy I was on the launch...I'm leaving ET AND mph on the table, because I'm "trying" not to have to trailer it home.



Spinning out of the hole is actually easier on the driveline (providing you don't have wheelhop) because you are not transferring all that power directly to the ground, subsequently, you usually MPH "better" on those passes. Someone can probably explain the concept better than me, but when you dead hook a pass, generally speaking you may ET very well, but the MPH is knocked down "some". You want to find a happy medium for the optimal pass. BUT as a general rule, MPH is directly related to RWHP and ET is a combination of HP/chassis tuning/shifting accuracy & speed etc etc (I'm over simplifying this but I think you get the idea). OH, and I can't really say I was trying for anything with regards to "fastest anything", I just wanted to MPH well, as this would be more representative of rwhp and would validate (to me at least) that my dyno numbers were the real deal. If I ran a good time, so be it, but I can't say I was trying for any record, my orders were bring the car home...driving it (not on a trailer).
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Old 09-29-2009, 09:33 PM   #17
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Once I put that blower on there....or the cam....or maybe even the headers...my warranty went away. I know the Magnuson Moss Act, but its all up to the dealer, and lets be honest, I'm not taking my dealer to court over it. So to answer your question, no I sure don't want to break a driveline part, but if I did it would be all me.

The other question you had...look at the 60' time. A "general" rule would be the better your 60' time, the harder you are on your driveline, and the more likely your gonna break something. I never went WOT in 1st gear on really any of my passes...1/2 or 3/4 MAYBE, and I sure didn't stall the converter up very much at all, just enough to remove the slack (say 1200 rpm).

Watch this video...listen to the RPM's in first, then second, it shifts early in 1st, and see how easy I was on the launch...I'm leaving ET AND mph on the table, because I'm "trying" not to have to trailer it home.



Spinning out of the hole is actually easier on the driveline (providing you don't have wheelhop) because you are not transferring all that power directly to the ground, subsequently, you usually MPH "better" on those passes. Someone can probably explain the concept better than me, but when you dead hook a pass, generally speaking you may ET very well, but the MPH is knocked down "some". You want to find a happy medium for the optimal pass. BUT as a general rule, MPH is directly related to RWHP and ET is a combination of HP/chassis tuning/shifting accuracy & speed etc etc (I'm over simplifying this but I think you get the idea). OH, and I can't really say I was trying for anything with regards to "fastest anything", I just wanted to MPH well, as this would be more representative of rwhp and would validate (to me at least) that my dyno numbers were the real deal. If I ran a good time, so be it, but I can't say I was trying for any record, my orders were bring the car home...driving it (not on a trailer).
I hear you there,driving home instead of getting a hook. I really never thought about trying for mph as opposed to et. The guys that I usually race with all have 2010's and we try to get the best time out of all of us. Maybe we'll change to mph next year. Next week's the last for the year. What did you dyno at? I didn't realize you did what you did to your car,of course the warrenty went out the door. One of the guys in our group lost his CV a few weeks back. Just shifted into 2nd and BANG. He was able to get it warrentied though. I'm going for my second dyno tomorrow. The first was with Hennessy CAI.and that dynoed at 374. Now I installed QTP cutouts so hopefully they are correct with their 18 rwhp & 17 lb claims.
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Old 09-29-2009, 09:42 PM   #18
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I hear you there,driving home instead of getting a hook. I really never thought about trying for mph as opposed to et. The guys that I usually race with all have 2010's and we try to get the best time out of all of us. Maybe we'll change to mph next year. Next week's the last for the year. What did you dyno at? I didn't realize you did what you did to your car,of course the warrenty went out the door. One of the guys in our group lost his CV a few weeks back. Just shifted into 2nd and BANG. He was able to get it warrentied though. I'm going for my second dyno tomorrow. The first was with Hennessy CAI.and that dynoed at 374. Now I installed QTP cutouts so hopefully they are correct with their 18 rwhp & 17 lb claims.
547rwhp/504rwtq at ~8psi on pump gas. I just knew this car with the IRS, and how heavy it is, would be susceptible to parts breaking if you 60' very well, hence, me not really getting too hung up on a killer ET. Its fun on the street and that's where it spends 95% of the time.

Are you guys mostly manual tranny cars? Was the one that broke its CV a manual?
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Old 09-29-2009, 11:46 PM   #19
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yes,he has 402 hp after some of his work. Damn strange how it just went though. He said he hooked really well and if he would have made it down that it would have been an awsome time. I hit 102 up in Douglas wyoming about a month ago. So far that's my quickest mph. We have 2 auto's and the rest are manuals. There are about 20+ of us in a small club> Camaro Club of the Rockies. www.ccotr.org. We get together for different events and Wed drags.

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Old 09-30-2009, 06:39 AM   #20
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yes,he has 402 hp after some of his work. Damn strange how it just went though. He said he hooked really well and if he would have made it down that it would have been an awsome time. I hit 102 up in Douglas wyoming about a month ago. So far that's my quickest mph. We have 2 auto's and the rest are manuals. There are about 20+ of us in a small club> Camaro Club of the Rockies. www.ccotr.org. We get together for different events and Wed drags.
Yeah, the manual cars seem to be much more violent during shifts...did any of their manual cars have wheel hop issues?

Sounds like you guys have a pretty fun thing going out there. I'm in BFE, there are just a few of us out here that have 2010's that get together.
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Old 10-01-2009, 10:51 AM   #21
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I experiance wheel hop several time. That's my main problem with the launch either wheel hop or too much spin.
I went last night just rolled off the line and then punched it. Ran 14.6 again. I was crowded as heck last night and their was several stoppages for track clean up. I was only able to get in 3 runs. I think everyone was trying to get 1 more track night in. One more next week but everyone I talked to expects the weather to probably cancel that one out. I'm done until next year,now it's time to put winter tires on him and dream about next spring.
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