Re: Drag Radial guys?
[Re: CSK]
#2806948
08/09/20 04:44 PM
08/09/20 04:44 PM
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Joined: Aug 2003
Posts: 4,682 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,682
On the parachute mount
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It’s normal to see “witness” marks . Some cars always do it , some don’t . If it bothers you call MT and ask them .
....BAD A$$ STREET CAR.....
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Re: Drag Radial guys?
[Re: justinp61]
#2807017
08/09/20 07:42 PM
08/09/20 07:42 PM
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Joined: Aug 2003
Posts: 4,682 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,682
On the parachute mount
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The reason I asked is that the last set didn't do it even when it was going 1.38 60'. These tires are five or six years old so I'm wondering if the sidewalls have gone away. At your level , they should last/work with the cords showing . My buddy has a nova 9.30’s with cords showing lol
....BAD A$$ STREET CAR.....
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Re: Drag Radial guys?
[Re: n20mstr]
#2807046
08/09/20 09:03 PM
08/09/20 09:03 PM
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Joined: Mar 2005
Posts: 525 Can , Nova Scotia , Cape Breto...
caper
mopar
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mopar
Joined: Mar 2005
Posts: 525
Can , Nova Scotia , Cape Breto...
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My m/t done the same thing a couple of years ago. I had a slow-motion video of my tires leaving the line. It seemed like the car was running over the tire. I put more air in the tires 19.5 psi stop making those marks on the sidewalls.
New best 10.18 , 1.40 60 ft 496 Scott Brown built, street driven 3600 lbs,654 hp , 653 ft tq
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Re: Drag Radial guys?
[Re: justinp61]
#2807264
08/10/20 01:06 PM
08/10/20 01:06 PM
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Joined: Jan 2003
Posts: 2,924 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,924
A shed in England
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You might need to up the pressure a little, try a 1/2lb each time till the 60ft drops off. We still get the witness marks at 19psi but it seems to be the best "all round" pressure on the M/T pro radials for us.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Drag Radial guys?
[Re: Tig]
#2807317
08/10/20 02:39 PM
08/10/20 02:39 PM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
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Nothing "wrong", just add some air pressure if the track will take it.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Drag Radial guys?
[Re: justinp61]
#2807330
08/10/20 03:19 PM
08/10/20 03:19 PM
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Joined: Jan 2003
Posts: 13,365 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,365
Marion, South Carolina [><]
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Forgot to add that I also ran them down til the chords were showing running mid 9s and low 1.3x sixties. When the tire was down to where the tread was gone and smooth, it was only about 1/2 used up. That was on the old style M/T ET Street radial though...not sure how the new ones fair. I think I used to get around 50 or 60 passes out of a pair. Just got my first new set of ET Street Rs last week.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Drag Radial guys?
[Re: an8sec70cuda]
#2807613
08/11/20 10:45 AM
08/11/20 10:45 AM
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Joined: Jan 2003
Posts: 2,924 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,924
A shed in England
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Forgot to add that I also ran them down til the chords were showing running mid 9s and low 1.3x sixties. When the tire was down to where the tread was gone and smooth, it was only about 1/2 used up. That was on the old style M/T ET Street radial though...not sure how the new ones fair. I think I used to get around 50 or 60 passes out of a pair. Just got my first new set of ET Street Rs last week. We got around 40 passes but the car is heavy and I probably overdo the burnout, the slick looked like it was showing a chord "pattern" but they were still black. This is on a Pro Drag Radial which is a full slick. Last time I got to the chords they were white / grey though that was a bias ply. No big wheelstands, 60fts were off some and we dropped a 10th in the 1/4 on the last 4 passes which was the other symptoms. Not out until Sept to find out if this was "definitely" the problem.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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