MT ET streets do they go bad just sitting?
#1117251
11/19/11 11:08 PM
11/19/11 11:08 PM
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Joined: Aug 2007
Posts: 498
El Dorado Ca
65signet
OP
mopar
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OP
mopar
Joined: Aug 2007
Posts: 498
El Dorado Ca
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I bought a pair in 08 and never use them, i went out to the track and my car just blows them off like i was in the water box, i know that i may need to upgrade my suspension some, but i would think they should hook a little.
1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 360/904 10.60s with J heads
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Re: MT ET streets do they go bad just sitting?
[Re: a493demon]
#1117255
11/20/11 04:19 PM
11/20/11 04:19 PM
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Joined: Aug 2007
Posts: 498
El Dorado Ca
65signet
OP
mopar
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OP
mopar
Joined: Aug 2007
Posts: 498
El Dorado Ca
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They are the ET street radials, i made 8 easy passes on them and then added the Carvert shocks made adjustment with the pinion snubber and got the same results.
So now i don't know if i should get the Hoosier DOTs or Caltracs
PSI in tires was 20
thanks
1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 360/904 10.60s with J heads
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Re: MT ET streets do they go bad just sitting?
[Re: 65signet]
#1117256
11/20/11 05:06 PM
11/20/11 05:06 PM
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Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
ProStDodge
master
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master
Joined: Dec 2003
Posts: 2,586
Illinois, Indiana, Louisiana
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My guess would be that you are not getting the weight transfer on the initial hit. The front suspension needs to be loose and able to move upward about 5 inches before the suspension stops hit. This may require lowering the torsion bar settings and trimming on the front suspension stops. An inexpensive set of 90/10 front shock will help a lot as well (about $100 for the pair). 20psi sounds a little high for you car, I would suggest starting around 16psi (get a GOOD tire gauge! - 1-2 psi make a big change) If you can, get a friend to take a video of the launch so you can analyze what is really happening. I use a digital camera with video mode, so I can upload to my computer for viewing. With older tires, you may want to do a little longer burnout on the first burnout of the day to heat the tires up and bring the oils closer to the surface. From then on, short burnouts to keep them from getting too "greasy". Pay attention to # 4 in the guide below!!!!! Direct quote from M/T site Quote:
BURNOUTS- FOR MOST APPLICATIONS
The length of your burnout will be dictated primarily by the ambient and track conditions. The hotter the temperatures, the shorter the burnout. When the temps get cool, a longer burnout will be necessary. Ideally you want the tire temp to be within 15 degrees of the track temperature on the launch. When the track temps exceed 120 degrees, it is always best to keep your tire temps on the lower side. Here are some additional tips for maximizing the performance of your M/T racing tires.
1. First pass of the day will be your longest. After that follow the guidelines of #2 and #3 stated below.
2. Automatic transmissions and Bias tires with Softer compounds: First pass or two, fairly hard burnout relative to ambient conditions. After that a light burnout should be sufficient.
3. Standard transmission and Radial tires: Typically shorter burnouts are better. A light burnout, enough to haze the tires, then stage immediately.
4. No dry hops. This does nothing to improve traction, and in some cases can have a negative effect.
Good luck and have fun!
Scott
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Re: MT ET streets do they go bad just sitting?
[Re: ProSport]
#1117258
11/20/11 05:37 PM
11/20/11 05:37 PM
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Joined: Aug 2007
Posts: 498
El Dorado Ca
65signet
OP
mopar
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OP
mopar
Joined: Aug 2007
Posts: 498
El Dorado Ca
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I have 90/10 on the front with limit stops, and it goes up about 4 inches or so before it hits, i will try the lower pressure, but the car does not even try to move as soon as i hit the throttle they are spinning.
1965 Plymouth Barracuda 273 M/SA
1970 Plymouth Duster 360/904 10.60s with J heads
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Re: MT ET streets do they go bad just sitting?
[Re: 65signet]
#1117260
11/20/11 08:11 PM
11/20/11 08:11 PM
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Joined: Aug 2003
Posts: 43,119
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,119
Bend,OR USA
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Quote:
I have 90/10 on the front with limit stops, and it goes up about 4 inches or so before it hits, i will try the lower pressure, but the car does not even try to move as soon as i hit the throttle they are spinning.
The radials are sensitive to track prep, they don't hook worth a hoot on a bad track is what I have found  And they don't recover once they start to spin  I have the same size tire in both the radials and bias ply M/T on the same size rims, the radials are about a 1/10 to 2/10 faster on a good track than the bias plys are but not on bad to moderate track. The bias plys will spin a liilte on a bad track and then grab and go, not so on the radials IHTHs  BTW, I've gone as quick as 1.43 60 ft on the radials and 1.49 on the bias plys, no spinning on either one of those runs. I have also gone high 1.50 when spinning on the bias plys and slower than that on the radials on a bad track  Life is a challenge, it is up to us to overcome the things that make us unhappy   
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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