Z06 Need guidance after terrible times at the track - Page 2 - CorvetteForum - Chevrolet Corvette Forum Discussion

Go Back  CorvetteForum - Chevrolet Corvette Forum Discussion > C5 Corvettes, 1997 - 2004 > C5 General
Reload this Page >

[Z06] Need guidance after terrible times at the track

Notices
C5 General General C5 Corvette and C5 Z06 Discussion not covered in Tech
Sponsored by:
Sponsored by:

[Z06] Need guidance after terrible times at the track

Reply

 
 
 
Old 06-29-2017, 09:50 PM
  #21  
cuisinartvette
CF Senior Member
 
Member Since: Oct 2004
Location: Valencia Ca.
Posts: 65,660
Thanked 865 Times in 799 Posts
St. Jude Donor '05
Default

Stroker is right on the money they are two different things!
You arent alone we all ran slow first time or so (or 4) out

Being in Redondo Beach yeah, nowhere to let er rip.

Watch how he slips the clutch no dumping it;pick up some junk rims & get a set of M/T drag radials if you can


Last edited by cuisinartvette; 06-29-2017 at 09:53 PM.
cuisinartvette is offline  
Reply With Quote
Old 07-30-2017, 07:34 PM
  #22  
harryk387
CF Senior Member
Thread Starter
 
Member Since: Oct 2016
Location: Redondo Beach CA
Posts: 236
Thanked 12 Times in 9 Posts
Default

Update. Interior video of today's best run. A little better than my first time a few months ago but still not cutting that 60' down


Last edited by harryk387; 07-30-2017 at 07:37 PM.
harryk387 is offline  
Reply With Quote
Old 07-30-2017, 08:41 PM
  #23  
MY03C5Z
CF Senior Member
 
MY03C5Z's Avatar
 
Member Since: May 2004
Location: Suck it Tom Brady - Go Birds! 🦅 - PA
Posts: 5,026
Thanked 81 Times in 69 Posts
Default

Dude that was some horrible wheel hop. That is extremely bad news for the transaxle. Those 18's you are running in the back are going to be harder to launch on then some 17's. You also don't want them at full pressure, I ran my 18" NT05's at 25 psi last time out and I had zero wheel hop. If I ever get any hop I immediately abandon a wot run attempt and just finish out the run at a normal pace. It is way to dangerous to these cars to take repeated hard wheel hop like that, you will break something if you have a stock driveline. If you're having that much trouble launching on street tires I would highly recommend getting a set of 17's for the track with some 275/40 drag radials, then air them down to 20 psi to start. Much easier to launch on and a lot safer. Also I'm guessing you're not going through the water box? I go around it, then back up to it with just the rear tires. The track workers will guide you back to it when they see you want to only get the backs wet. Start your burnout in the water, I do it in 2nd. You then roll out of the water spinning until the tires 'bite'. You will very clearly feel that after only 2-3 seconds. Yore initial burnout was really rough.

.

Last edited by MY03C5Z; 07-30-2017 at 08:47 PM.
MY03C5Z is online now  
Reply With Quote
The Following User Says Thank You to MY03C5Z For This Useful Post:
harryk387 (07-30-2017)
Old 07-30-2017, 08:49 PM
  #24  
harryk387
CF Senior Member
Thread Starter
 
Member Since: Oct 2016
Location: Redondo Beach CA
Posts: 236
Thanked 12 Times in 9 Posts
Default

Originally Posted by MY03C5Z View Post
Dude that was some horrible wheel hop. That is extremely bad news for the transaxle. What tires are you running out back and what is the pressure? Stock 18's are more prone to hop if you don't launch them right. You also don't want them at full pressure, I ran my 18" NT05's at 25 psi last time out and I had zero wheel hop. If I ever get any hop I immediately abandon a wot run attempt and just finish out the run at a normal pace. It is way to dangerous to these cars to take repeated hard wheel hop like that, you will break something if you have a stock driveline. If you're having that much trouble launching on street tires I would highly recommend getting a set of 17's for the track with some 275/40 drag radials, then air them down to 20 psi to start. Much easier to launch on and a lot safer.
I know. The wheel hop was terrible. Stock driveline too. Would slipping the clutch some help with decrease the wheel hop?

I'm running 18" Toyo R888s all 4 corners. 305/35/18 in the rear and 275/40/17 in the front. I had the rear tires down to around 20psi
harryk387 is offline  
Reply With Quote
Old 07-30-2017, 08:58 PM
  #25  
MY03C5Z
CF Senior Member
 
MY03C5Z's Avatar
 
Member Since: May 2004
Location: Suck it Tom Brady - Go Birds! 🦅 - PA
Posts: 5,026
Thanked 81 Times in 69 Posts
Default

I edited my reply after I went back and saw what tires you had in your initial post. Are you using the water box? You really should. You won't have that brutal hop if you start from the water. You must be dumping the clutch too fast off the line too. You can't just release it that fast that's going to cause hop, you need to be a bit smoother with your release. It can be hard to explain but once you get the feel for it it makes sense. Are you also sure nothing is broken already? Like the trans mount especially. That would cause extreme hop like that. You should check it out to be sure it's ok. I also have a transaxle brace, from DTE. It reduces hop and strengthens the trans and axle.

Last edited by MY03C5Z; 07-30-2017 at 09:00 PM.
MY03C5Z is online now  
Reply With Quote
Old 07-31-2017, 11:51 AM
  #26  
Scotty2000SS
CF Senior Member
 
Scotty2000SS's Avatar
 
Member Since: Jun 2015
Location: Roseville California
Posts: 595
Thanked 19 Times in 19 Posts
Default

Not enough clutch slip. Ride that baby out!! You need to keep your rpms up. Try launching at 3,500 with a clutch slip.
Scotty2000SS is offline  
Reply With Quote
Old 07-31-2017, 03:09 PM
  #27  
Trash
CF Senior Member
 
Member Since: Apr 2010
Posts: 333
Thanks: 0
Thanked 8 Times in 8 Posts
Default

Originally Posted by Scotty2000SS View Post
Not enough clutch slip. Ride that baby out!! You need to keep your rpms up. Try launching at 3,500 with a clutch slip.
I concur with this. Slip the clutch more, but not to the 330' mark...lol
Trash is offline  
Reply With Quote
Old 07-31-2017, 04:48 PM
  #28  
Potent68
CF Senior Member
 
Member Since: May 2006
Posts: 102
Thanked 14 Times in 12 Posts
Default

What were your times on that most recent trip?
Potent68 is offline  
Reply With Quote
Old 08-01-2017, 08:29 PM
  #29  
harryk387
CF Senior Member
Thread Starter
 
Member Since: Oct 2016
Location: Redondo Beach CA
Posts: 236
Thanked 12 Times in 9 Posts
Default

I would drive over the water box until my rear tires were just barely still in there then mash the gas for a few seconds. I've never learned how to do a proper burnout so I'm sure that also has to do with the high 60' times.

I'll definitely try more clutch slip at higher rpm next time to see if that helps.
harryk387 is offline  
Reply With Quote
Old 08-04-2017, 11:28 AM
  #30  
Stroker87
CF Senior Member
 
Stroker87's Avatar
 
Member Since: Feb 2014
Location: chicago area IL.
Posts: 2,476
Thanked 87 Times in 78 Posts
Default

its hard to say what a proper burnout is every car is different HP/tq tire setup air pressure its something you need to figure out to short is no good and to long is just as bad

that hop can bust up that trans and diff you need to watch that, last time at RPM they had a car on the lift that the wheel hop caused the trans and diff case to crack
Stroker87 is offline  
Reply With Quote
Old 08-06-2017, 08:39 PM
  #31  
Trash
CF Senior Member
 
Member Since: Apr 2010
Posts: 333
Thanks: 0
Thanked 8 Times in 8 Posts
Default

Originally Posted by harryk387 View Post
I know. The wheel hop was terrible. Stock driveline too. Would slipping the clutch some help with decrease the wheel hop?

I'm running 18" Toyo R888s all 4 corners. 305/35/18 in the rear and 275/40/17 in the front. I had the rear tires down to around 20psi

I just realized that was Fontana. PM me next time you go and perhaps I can make it up there. Maybe I'll bring the wife's car...

Don't expect great ETs or trap speed at Fontana. That place will humble you quickly. Typically higher DA and marginal prep.

Having said that 1.8x are within reach. I was able to meet factory numbers but it took a lot of work.
Trash is offline  
Reply With Quote
Old 08-07-2017, 07:59 PM
  #32  
FASTFATBOY
CF Senior Member
 
Member Since: Jun 2002
Location: Mobile al
Posts: 2,573
Thanked 132 Times in 112 Posts
Default

You drive pretty good.

How hot was it outside?

That wheel hop is going to cost you a **** ton of money if you don't stop doing it.

I ran 120 mph with 440rwhp in 75 degree humid weather but had a slipping stock clutch and I'm at 3400lbs. I was also on Michelin Pilot Super Sports, I think 11'[email protected] ish are reachable with the new clutch.
FASTFATBOY is offline  
Reply With Quote
Old 08-14-2017, 09:48 AM
  #33  
C5Dobie
CF Senior Member
 
Member Since: Jan 2014
Location: MA
Posts: 884
Thanked 31 Times in 24 Posts
Default

I know I was kinda being a smarta$$ w/ the sportbike comment, but after seeing your vid & launch seeing what's holding ya back actually something relevant popped in my head - taking a sportbike to the dragstrip is the definition of making the SMOOTHEST interaction possible between clutch engagement, slippage, & good times. You cannot mess around w/ the launch no way in hell can you just drop the clutch or you can lose your bike or much worse.

You need to better manage the release of the clutch while simultaneously feeding the throttle, clutch should be partially engaged when the wheels start to spin, way you're doing it looks like an on/off switch situation.

There's definitely a "grey area" between clutch engagement/slippage, wheel spin & launch. Play in the grey area.
C5Dobie is offline  
Reply With Quote
Old 08-14-2017, 08:29 PM
  #34  
furious465
CF Senior Member
 
furious465's Avatar
 
Member Since: Jun 2016
Location: Spring Hill Florida
Posts: 420
Thanked 24 Times in 21 Posts
Default

furious465 is offline  
Reply With Quote
Old 08-14-2017, 09:44 PM
  #35  
Scotty2000SS
CF Senior Member
 
Scotty2000SS's Avatar
 
Member Since: Jun 2015
Location: Roseville California
Posts: 595
Thanked 19 Times in 19 Posts
Default

Originally Posted by furious465 View Post
Where do I sign for lessons?? Lol!
Scotty2000SS is offline  
Reply With Quote
 
 
 


Thread Tools
Search this Thread
Quick Reply: [Z06] Need guidance after terrible times at the track


Sponsored Ads
Vendor Directory

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: