First time with DRs, advise?
Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 2
First time with DRs, advise?
There is a possibility of me going to Atco this weekend with my friend's Drag Radials.
I usually launch around 3000 rpms on street tires with a quick slip.
What should I do with DRs? Should I just drop it at like 4500? Or ease it out? feather the gas? etc?
Thanks for the help guys!
I usually launch around 3000 rpms on street tires with a quick slip.
What should I do with DRs? Should I just drop it at like 4500? Or ease it out? feather the gas? etc?
Thanks for the help guys!
Safety Car
Joined: Nov 2005
Posts: 4,381
Likes: 939
From: Huntsville Alabama
lightly, clean /heat them, dump clutch, and feather gas. try differnt rmp levels until you ge to where your 60 is best. dependign th what tire, they may hold a dead hook at HIGH rpms. I have seen a 6000 RPM dump dead hook on MT drag radials.
Melting Slicks
Joined: Oct 2006
Posts: 2,905
Likes: 1
Start at 30 psi and work your way down until no spinning or very little spin at the launch. Do a good burnout(you know the deal, drive around the water, back in, roll forward and lite them up) and the rest is history.I say start at 30 psi because way too many people treat drag radials like slicks and they just aren't. If you go too low on psi, it'll kill mid to top end mph and hurt ET.
Drifting
Joined: Feb 2007
Posts: 1,844
Likes: 12
From: Alpharetta Georgia
I ran 15psi in mine hot and launched with a fairly long slip from 4k rpm. I ended up blowing the tires off on that run and having to lift and get back in it, but it still netted my best 60' on the day which was a horrible 1.91. When I would engage the clutch quickly from 4k rpms as opposed to a slipping it, the car would hook and bog. I would assume a combination of the two would probably be where I need to be, so I will try to blend these 2 techniques next time I am at the track. Also, at 20psi on the DR's I was getting horrible wheel hop.
Melting Slicks
Joined: Oct 2006
Posts: 2,905
Likes: 1
1.8, the wheel hop had to be due to track prep, I'd think, can't say for sure since i wasn't there, but at 28psi on MT drs, I get almost no slip and zero wheel hop at all. They still slip a little at the 2-3 shift, but nothing like the PS2s did. I may drop to 26 next time out, but for my experience, anything under 24psi hurts much more than it helps with these tires.
Melting Slicks
Joined: Jun 2004
Posts: 3,413
Likes: 278
From: NC
I would be careful of the output shaft or the rear end if you plan on dumping the clutch at 4,500 rpm or above. If you dead hook, something is going to give....
Last time I was at the track, an LS3 (rear end) and a C6 Z06 (output shaft) both broke....both had a CCW drag pack.
I would use the same technique you used with the stock tires (quick feather of clutch and add throttle), but now you can raise it up a little higher and still have traction.
Last time I was at the track, an LS3 (rear end) and a C6 Z06 (output shaft) both broke....both had a CCW drag pack.
I would use the same technique you used with the stock tires (quick feather of clutch and add throttle), but now you can raise it up a little higher and still have traction.
Burning Brakes
Joined: Sep 2005
Posts: 896
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From: St. Lucie, FLORIDA 757 RWHP 694 RWTQ
Looking foward to that day.
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Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 2
I ran yesterday (12/14).
I only got 3 runs, and I'll go as far to say two because an oil down screwed up the one side of the track.
The first run I came out at 4000 rpms and released the clutch too quickly and bogged.
The result of the first run was a 1.934 60' which was no better than anything I've done before. 11.671 @ 123.46 MPH was a new best for ET and MPH.
The second run was my best run. I slipped the clutch for too long though, it seemed to slip all the way through first which I think may have slowed me down a little.
1.751 60', 11.502 @ 122.66 MPH
Last time I spun pretty bad because of the oil damage to the lane and had to get off of it. 1.912 60' to an 11.693 @ 123.01 mph.
So for my first time with drag radials I didn't do too bad. I'm sure I'll get some better runs once I get to know how to launch with them correctly!
I ran at 22.5 PSI and launched at 4000 on all runs.
I only got 3 runs, and I'll go as far to say two because an oil down screwed up the one side of the track.
The first run I came out at 4000 rpms and released the clutch too quickly and bogged.
The result of the first run was a 1.934 60' which was no better than anything I've done before. 11.671 @ 123.46 MPH was a new best for ET and MPH.
The second run was my best run. I slipped the clutch for too long though, it seemed to slip all the way through first which I think may have slowed me down a little.
1.751 60', 11.502 @ 122.66 MPH
Last time I spun pretty bad because of the oil damage to the lane and had to get off of it. 1.912 60' to an 11.693 @ 123.01 mph.
So for my first time with drag radials I didn't do too bad. I'm sure I'll get some better runs once I get to know how to launch with them correctly!
I ran at 22.5 PSI and launched at 4000 on all runs.
Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 2
Stock intake, stock shifter, stock filter (which I should probably change out since I have 30,000 miles on it already). Nothing removed either (not like you can remove a lot from a corvette lol).
I'm just copying and pasting from my post on the list:
My first run with drag radials (bogged BAD):
60' - 1.934
330 - 5.134
1/8 - 7.681
MPH - 97.47
1000- 9.844
1/4 - 11.671
MPH 123.46
My second and best run (clutch slipped all the way through first
and the car got heat soaked a little because the guy infront of me was held up while I was in the water box):60' - 1.751
330 - 4.916
1/8 - 7.488
MPH - 96.85
1000 - 9.666
1/4 - 11.502
MPH - 122.66
And my last run (track oiled down now so I spun bad):
60' - 1.912
330 - 5.128
1/8 - 7.689
MPH - 96.92
1000 - 9.860
1/4 - 11.693
MPH - 123.01
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
1.8, the wheel hop had to be due to track prep, I'd think, can't say for sure since i wasn't there, but at 28psi on MT drs, I get almost no slip and zero wheel hop at all. They still slip a little at the 2-3 shift, but nothing like the PS2s did. I may drop to 26 next time out, but for my experience, anything under 24psi hurts much more than it helps with these tires.
For the M6 I think you generally want the highest pressure that still minimizes (1) spin on launch and (2) hop on the 1-2 shift. If those pressures are working for you, no reason to drop them further. The lower you drop them, the greater the rolling resistence. I know at my MIR track rental the Z06 guys on DR's were setting the fronts to 40-41 and the rears to 19-18 and reseting the pressure immediately before each run. Note if one tire is sitting in the sun it will tend to yield pressure that's uneven side-to-side.
Last edited by siffert; Dec 15, 2008 at 12:02 PM.
Melting Slicks
Joined: Feb 2004
Posts: 3,131
Likes: 148
From: Sugar Land TX
Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 2
The LS3 headers are D-shaped as well. So it really makes no difference until I want to get the heads ported... then I'll be kicking myself lol
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
I dont know about the LS3, but for the LS2, if you look at a pic of a Z06 exhaust manifold gasket on an LS2 head, the LS7exhaust port is larger than the LS2, and the flat bottom of the LS7 "D" port was below the round port opening of the LS2. The LS2 port was not blocked at all. You get around a 20hp boost with the Z06 manifolds and usually can be obtained for far less cost than the Brand Named "Corvette Taxed Headers".
Last edited by siffert; Dec 15, 2008 at 01:41 PM.
Safety Car
Joined: Nov 2005
Posts: 4,381
Likes: 939
From: Huntsville Alabama
what does it dyno? please?
have 06 C6 (ls2) just did 1 7/8th headers, 3inch x-pipe, and magnaflow axcel back. tuning tomorrow.
we only have 1/8th mile her and wonder what i can run. thinking low 8 maybe high 7 on drag radials.
thoughts?
have 06 C6 (ls2) just did 1 7/8th headers, 3inch x-pipe, and magnaflow axcel back. tuning tomorrow.
we only have 1/8th mile her and wonder what i can run. thinking low 8 maybe high 7 on drag radials.
thoughts?
Last edited by mittens; Dec 15, 2008 at 08:03 PM.
Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 2
I might actually going to a dyno this week to see what it is putting down, and if I can get any more out of it. Might even be tonight!
I'll post any updates I have.
I couldn't speculate on what the LS2 would run, but if I ran mid 7 second runs, you shouldn't be too far behind.
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
been ET for me. Anyways, with headers, CAI, tune, DR's and good air, I recently cut a 7.65 with my '07 C6 A6. I see 7's for you if you added a CAI or did the "free air mod" by propping open your shroud.
Thread Starter
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 2
I guess maybe you mean low 7s, which I think could be possible with a better launch once I get a little better with these things.
See for me the LS3 intake is beautiful, absolutely perfect and no need to change it (except for maybe that free air mod with the shroud). I am going to change the filter as I've got 30,000 miles on my vette already (bought it new in feb) and I haven't changed the filter.
Safety Car
Joined: Aug 2006
Posts: 4,206
Likes: 6
From: Makena, Maui & NM
Well it is definitely 7s... considering it was ran 7.488 :P
I guess maybe you mean low 7s, which I think could be possible with a better launch once I get a little better with these things.
See for me the LS3 intake is beautiful, absolutely perfect and no need to change it (except for maybe that free air mod with the shroud). I am going to change the filter as I've got 30,000 miles on my vette already (bought it new in feb) and I haven't changed the filter.
I guess maybe you mean low 7s, which I think could be possible with a better launch once I get a little better with these things.
See for me the LS3 intake is beautiful, absolutely perfect and no need to change it (except for maybe that free air mod with the shroud). I am going to change the filter as I've got 30,000 miles on my vette already (bought it new in feb) and I haven't changed the filter.
To wit: we only have 1/8th mile here and wonder what i can run. thinking low 8 maybe high 7 on drag radials. thoughts?
I know what your LS3 can do along with -2000 to -3500 DA at Atco helping carrying you along
Last edited by siffert; Dec 16, 2008 at 02:05 PM.