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New PB - [email protected] 1.44 60 foot

 
Old 02-15-2012, 09:41 PM
  #61  
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Originally Posted by Joe_G View Post
That's true I forgot that 4.10 gears reduce dyno results but they do. I found a great explanation of why and posted it years ago.

Gears make it a lot easier to launch truth be known. I found a difference even between 3.90's an 4.10's. But 4.10's with H/C make it a lousy 1/8 mile car due to the extra shift. That was my first "6" second 1/8.
Yeah, that's the reason I don't run 1/8. I can't stand having to make the shift right before the traps, but sure would have liked to join the 6 sec club. Though I know if I had the non-z51 trans like before, so I didn't have to make that shift, it'd be done easily as I lost 3 mph in the 1/8 having to make that shift.

I went [email protected] on a 1.54 making two shifts previously and [email protected] on a 1.49 making three shifts with z51 trans.
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Old 02-15-2012, 09:54 PM
  #62  
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Joe you are right about making up et in the first 1/8. My car dyno 445/428 . my best was a [email protected] on my 10.78 run I only back half ed 23.5mph. On another not so great run when I spun I ran 97.6 and 124.33(which is my all time best MPH)

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Old 02-16-2012, 10:27 PM
  #63  
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Congrats Joe! Great driving. That launched looked perfect.
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Old 02-17-2012, 06:01 AM
  #64  
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Originally Posted by GARY2004Z06 View Post
Congrats Joe! Great driving. That launched looked perfect.
Thanks Gary! A complement from an experienced and proven master like yourself means a lot.

What is your launch technique? Are you accelerating into the clutch release too? What's your launch RPM?
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Old 02-17-2012, 10:13 AM
  #65  
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Thanks Joe. We try to match the launch to the tires and track conditions. What works at one tracsk on a given day may not work at the same track on another day. We have found that different tracks require completely different techniques and adjustments. We have ran a number of different tires this year including DRs which have not been used in over a year. Our current setup prefers a slick but does run well on a DR. We have been very fortunate to be able to cut 1.3s almost at will on the slick when the track is there. The DR is not quite as cooperative but it does have its moments. As you know, different clutches require different technique and you my friend have optimized yours.
Keep the numbers coming.
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Old 02-17-2012, 10:43 AM
  #66  
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Originally Posted by GARY2004Z06 View Post
Thanks Joe. We try to match the launch to the tires and track conditions. What works at one tracsk on a given day may not work at the same track on another day. We have found that different tracks require completely different techniques and adjustments. We have ran a number of different tires this year including DRs which have not been used in over a year. Our current setup prefers a slick but does run well on a DR. We have been very fortunate to be able to cut 1.3s almost at will on the slick when the track is there. The DR is not quite as cooperative but it does have its moments. As you know, different clutches require different technique and you my friend have optimized yours.
Keep the numbers coming.
That's certainly true...I have to say it's not every day the track will hold a 100% throttle 6800 launch.

Based on my experience I don't think I'll ever get a 1.3 with my setup, and frankly I don't feel compelled to try! :lol

In my case I guess it's the hundreds of passes I've got under my belt that dictates how fast to release the clutch given track conditions. Anybody can floor a car so that's not where the magic is when launching a manual. I was trying to describe what I do to Double A Vette who's coming up to MIR tomorrow and I was struggling how to describe it...I told him to listen to it, that's the best way I guess I can describe it.

I'm still amazed my OE clutch will do this for 62000 miles and 466 passes.

I have another 1.44 video I'll post up this weekend. I haven't even watched it yet, I wonder what it'll show.

Last edited by Joe_G; 02-17-2012 at 10:50 AM.
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Old 02-17-2012, 02:14 PM
  #67  
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Originally Posted by Joe_G View Post
I was trying to describe what I do to Double A Vette who's coming up to MIR tomorrow and I was struggling how to describe it...I told him to listen to it, that's the best way I guess I can describe it.
It's something that's hard to teach in words.
And you do things subconsiously now that you might not even realize in order to compensate for minor varying conditions.
The driver needs to have some seat time using his/her own method proir to implementing this technique because one needs to have a feel for the car and what it's doing and see and feel the difference.

That launch style also varys from clutch to clutch but the theory never changes.
If people are interested I can put together a general theory of what one should be trying to achieve during a manual vette launch and how to work up to an agressive launch style like the way you do it.
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Old 02-17-2012, 02:15 PM
  #68  
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Originally Posted by robz View Post
It's something that's hard to teach in words.
And you do things subconsiously now that you might not even realize in order to compensate for minor varying conditions.
The driver needs to have some seat time using his/her own method proir to implementing this technique because one needs to have a feel for the car and what it's doing and see and feel the difference.

That launch style also varys from clutch to clutch but the theory never changes.
If people are interested I can put together a general theory of what one should be trying to achieve during a manual vette launch and how to work up to an agressive launch style like the way you do it.

I'd love that personally.

I feel like I have a good grasp of launching/driving my car, but I would love another resource.
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Old 02-17-2012, 02:26 PM
  #69  
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Originally Posted by robz View Post
It's something that's hard to teach in words.
And you do things subconsiously now that you might not even realize in order to compensate for minor varying conditions.
The driver needs to have some seat time using his/her own method proir to implementing this technique because one needs to have a feel for the car and what it's doing and see and feel the difference.

That launch style also varys from clutch to clutch but the theory never changes.
If people are interested I can put together a general theory of what one should be trying to achieve during a manual vette launch and how to work up to an agressive launch style like the way you do it.
I think your efforts would be well appreciated by many.

I always credit you with a significant factor in allowing me to reach 1.5's at will...accelerate into the launch instead of just hold at RPM and release.

That one tip alone made a huge difference.
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Old 02-17-2012, 02:37 PM
  #70  
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At the risk of showing my slow shifting to the world here is my scan of that run.

Three things to note:

Note how I was accelerating into the launch, see the RPM rising (red line top graph) before the car moves (green line top graph).

Also note, I was on the way to flooring the throttle before the tires moved (green line 3rd graph) but I actually lifted just a little on the initial bite. I frankly think it might have been the g-forces, as I see no spin off the line. But I often see little blips of the throttle in the launch sequence on the scans that I do not remember. I do it automatically as I feel the tires bite, or not, during the process.

By the way, notice how the RPM's drop in first gear despite the throttle being floored (green line third chart)...that's the clutch hooking up. Did I mention that this is the 466'th time I've done that to this clutch?

The secret to the good launch is that the RPM's never fall below 4800 during the launch sequence. Easy to say, harder to do.

The G-forces of a 1.44 launch feel pretty nice I can attest.



And in the interest of full disclosure. The reason my shifting was so slow is because I hurt my trans in the run before this where I got a 1.44 but missed 3rd. I broke my 3rd gear blocker ring. It happened to me before - when this happens, you cannot get the car into 3rd without jamming it and it'll grind. Even with my hurt tranny, I knew it was my last chance to get some zero DA weather and daytime traction so I wanted my slip. I knew I could shift slowly and get a decent pass...results in sig.

Here's the part I broke last time, and again this time. I wish I had a 6060!


Last edited by Joe_G; 02-17-2012 at 02:47 PM.
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Old 02-17-2012, 02:40 PM
  #71  
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Oh and there's another interesting nugget of information in that scan...let's see if anyone can guess what it is. It's scary information, that's a hint.
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Old 02-17-2012, 02:43 PM
  #72  
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Time for some bigger injectors sir.
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Old 02-17-2012, 02:45 PM
  #73  
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Originally Posted by Justinjor View Post
Time for some bigger injectors sir.
Nope. Good guess, I'm comfortable with 95% duty cycle, I can still command and get 12.5.

Last edited by Joe_G; 02-17-2012 at 02:51 PM.
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Old 02-17-2012, 02:46 PM
  #74  
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I see you log your oil pressure now. It takes a nasty dip on the launch--worried about oil starvation? Time for an accusump or something else to combat that?
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Old 02-17-2012, 02:50 PM
  #75  
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And I want to add...I am putting my rear end in significant peril with these launches. Don't come crying to me if you end up with this....



If you want to play at this level you better be willing to pay because you are going to have to at some point.
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Old 02-17-2012, 02:52 PM
  #76  
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Is that your carnage Joe?
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Old 02-17-2012, 02:56 PM
  #77  
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Originally Posted by Justinjor View Post
I see you log your oil pressure now. It takes a nasty dip on the launch--worried about oil starvation? Time for an accusump or something else to combat that?

Ding Ding Ding. Someone clued me into this when I noticed the LS3's have something in their tune to cut power for oil starvation. I scanned my car and the g-forces surely do have an effect on oil pressure with our wet sump.

I'm not frankly worried about it, it's been doing this since day one and it's fine. YRMV.

Originally Posted by Justinjor View Post
Is that your carnage Joe?
Yes that is the result of my 302'nd launch on my OE 2005 rear end.
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Old 02-17-2012, 02:59 PM
  #78  
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Ya, I was thinking about logging that PID myself but it's not like it'll change anything. I'm not putting a dry sump on the car anytime soon(if ever) so it's one of those "I'd rather not know" things I guess.

I had to google "YRMV" as I had no clue what you were saying.

Nice carnage, did you keep it for the memories?
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Old 02-17-2012, 03:03 PM
  #79  
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True.

Do you think being the first year of the C6, you're prone to more problems than others?
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Old 02-17-2012, 03:22 PM
  #80  
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Originally Posted by Justinjor View Post
True.

Do you think being the first year of the C6, you're prone to more problems than others?
The 05 rear is known to be weak.

I was surprised I got 301 launches out of it.
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