Shock Setting Radials
#2963606
09/13/21 12:59 PM
09/13/21 12:59 PM
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Joined: Dec 2004
Posts: 415 New Braunfels, TX
416challenger
OP
mopar
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OP
mopar
Joined: Dec 2004
Posts: 415
New Braunfels, TX
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I am planning to run a local Mopar race that is for street cars and does not allow slicks for the bracket race. I have tried radials years ago with not much luck hooking consistently, it would hook one pass and then blow the tires off the next. I normally race with a 29.5 x 10.5 MT bias slick, but wanting to run on my street tires 295/65/15 ET Street S/S. With slick and old motor the car has been 1.43 60' time. Current motor is a 5.7 with supercharger and is lazy in the 60' (1.5649 best 60', 6.6206 1/8 mile at 106.11 mph, 10.3120 1/4" mile at 132.70 mph)
The car is a 73 Challenger about 3650 lbs Calvert mono leaf springs and bars, Strange double adjustable rear, and Calvert 90/10 front 4600 converter with 4.10 gear
I am looking for a good starting point on tire pressure and rear shock settings. Any help is greatly appreciated.
Last edited by 416challenger; 09/13/21 01:15 PM.
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Re: Shock Setting Radials
[Re: 416challenger]
#2963635
09/13/21 01:51 PM
09/13/21 01:51 PM
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Joined: Aug 2003
Posts: 4,688 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,688
On the parachute mount
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My sons car will literally 60' 1.40's anywhere . Its caltracs with a 295 radial. He has Afco double adj out back and the calvert 90/10 up front. We run the Afcos full tight on the extension and almost full tight on the compression. Now we are a nitrous car, with no progressive or launch retard, we literally spray a plate . Im not sure about the front segment of an E body Spring , as an A body spring is short and really slams the tire We just got the Afcos revalved to a "radial" valving. I would say with the radial tight is better, now if it doesnt hook, loosen the extension a little at a time. You want the car to plant the tire and hold it there. Pressure on a radial is usually higher than a slick. You dont want to wrinkle the tire because it will snap back and tire shake. We run the 295 at 20lbs, sometimes as much as 22. Even on my Ultra street car, we run the tire 17.5 to 19 depend on track. Rim size also effects the tire pressure. A wider rim needs more air to keep the tire from cupping in the center.
Last edited by n20mstr; 09/13/21 01:56 PM.
....BAD A$$ STREET CAR.....
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Re: Shock Setting Radials
[Re: n20mstr]
#2963641
09/13/21 02:06 PM
09/13/21 02:06 PM
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Joined: Dec 2013
Posts: 4,689 Wichita
GY3
master
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master
Joined: Dec 2013
Posts: 4,689
Wichita
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Every car will be different but we run 18 psi in our drag radials. Shock settings with the Calvert/Rancho's was always full stiff @ #9. Fronts at 90/10. Best of 1.36 60 ft.
With Vikings running N/A we are doing 12 Compression and 6 Rebound on the rear. Not much of a chance to test with the Vikings with nitrous but it is doing a wheelie and then unloading and spinning with them. Going to try going to the 70/30 to slow down the extension. Ultimately it needs Vikings on the front, too.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Shock Setting Radials
[Re: GY3]
#2963645
09/13/21 02:13 PM
09/13/21 02:13 PM
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Joined: Aug 2003
Posts: 4,688 On the parachute mount
n20mstr
master
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master
Joined: Aug 2003
Posts: 4,688
On the parachute mount
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Every car will be different but we run 18 psi in our drag radials. Shock settings with the Calvert/Rancho's was always full stiff @ #9. Fronts at 90/10. Best of 1.36 60 ft.
With Vikings running N/A we are doing 12 Compression and 6 Rebound on the rear. Not much of a chance to test with the Vikings with nitrous but it is doing a wheelie and then unloading and spinning with them. Going to try going to the 70/30 to slow down the extension. Ultimately it needs Vikings on the front, too. ^^^^^ THIS , When you get to the point your at (10.30's high 9's) You going to need a double adj front to slow the front extension. That and the HP to move a 3600lb and radials dictate a GOOD double adj rear shock. YOu be surprised how hard it is to pull a radial valved shock apart LOL But its whats needed to control the tire. Especially on Mopars that have short front spring segments and that translates to short instant centers that slam the tire. Thats why shock valving that works on GM leaf spring cars is still too loose for a Mopar. They have different length springs and different Instant Centers
....BAD A$$ STREET CAR.....
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Re: Shock Setting Radials
[Re: n20mstr]
#2963695
09/13/21 04:05 PM
09/13/21 04:05 PM
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Joined: Jan 2003
Posts: 2,926 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,926
A shed in England
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We have 20" front segment monoleafs on our Challenger (using the old S/S spring mounts) and as stated, it does hit the tyre hard. We had our rear D/A Afco's re-valved by Menscer to control it. Without looking at our settings book, I'm pretty sure we are close, 6 or so clicks from full tightness on extension but it works well. We have Santhuffs on the front. We are running a radial slick 29.5 x 10.5 between 19 / 21 psi. car weighs over 4000lb and we regularly 60ft with the backs around 1.38 with a 1.36 best. A couple of years we were putting them down before the 60 beam with a best of 1.34. 4.10 rear (though we are changing to 3.73) 5500 stall, 51.5% over the rear.
'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: Shock Setting Radials
[Re: Tig]
#2963722
09/13/21 05:35 PM
09/13/21 05:35 PM
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Joined: Mar 2009
Posts: 2,467 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,467
Sydney,Australia
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I run Viking dbls out back , the radial valved units . QA1 singles on front , yeah i should get dbls but i rarely have traction issues . Caltracs and Mopar XHD springs . #10 from compression / #5 ext rear . Full loose front . When i ran 275s (8"rim)or PBR 28s i was 18-18.5psi Now with PBRs 29.5x10.5 on 10"rim its 19 1/4 Hoosier Radial 30x10.5 on 8"its 18 High 1.40s leaving @ 1500 Currently footbraking , but also have used transbrake . The best shock you can afford is your friend on radials , especially rear .
Tex
Last edited by tex013; 09/13/21 05:35 PM.
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: Shock Setting Radials
[Re: 416challenger]
#2963733
09/13/21 05:57 PM
09/13/21 05:57 PM
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Joined: Feb 2003
Posts: 4,953 Houston, Texas
TheOtherDodge
master
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master
Joined: Feb 2003
Posts: 4,953
Houston, Texas
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I am planning to run a local Mopar race that is for street cars and does not allow slicks for the bracket race. I have tried radials years ago with not much luck hooking consistently, it would hook one pass and then blow the tires off the next. I normally race with a 29.5 x 10.5 MT bias slick, but wanting to run on my street tires 295/65/15 ET Street S/S. With slick and old motor the car has been 1.43 60' time. Current motor is a 5.7 with supercharger and is lazy in the 60' (1.5649 best 60', 6.6206 1/8 mile at 106.11 mph, 10.3120 1/4" mile at 132.70 mph)
The car is a 73 Challenger about 3650 lbs Calvert mono leaf springs and bars, Strange double adjustable rear, and Calvert 90/10 front 4600 converter with 4.10 gear
I am looking for a good starting point on tire pressure and rear shock settings. Any help is greatly appreciated.
Hey, long time no chat! Hope all is well! Where is the race and what details! Would love to bring my truck out to it!
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Re: Shock Setting Radials
[Re: 416challenger]
#2963890
09/14/21 01:59 AM
09/14/21 01:59 AM
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Joined: Aug 2003
Posts: 43,230 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,230
Bend,OR USA
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i would look at and buy the same size ET Street Bias ply as the slicks you mentioned Are the tires you mention,295/65/15, radials or bias ply? I ran the M/T ET Street 325x60x15 ET Street Radials and the same size ET Street bias ply and the radials were faster on a good track but not worth a hoot on fair or bad track or on fair street Once the radials would start to spin I had to let off for them to recover The same size ET Streets might spin a 1/4 to 3/4 turn on the hit but hook and stay hooked up after that on bad streets and roads I ran both 10 and 12 inch wide rims and used 18 to 20 lbs. on the radials and from 9.0 to 12.0 on the bias ply tires depending on the track conditions to get them hooked up and stay hooked up I ran both tubeless also
Last edited by Cab_Burge; 09/14/21 01:59 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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