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Old 06-24-2009, 09:46 PM   #1
85_prairieboy
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Drag radials or slicks

This past weekend I finally made it to the track. I ran better than I was expecting, a best of 13.76 at 98.99. I had major traction issues though. I am just using BFG street tires. My average 60 ft was around 2.25. All of those passes I tried to ease into the throttle but ended up spinning and letting off. My best was 2.0 with a passenger. Too bad I had to let off at the end, that would have been a good pass. I obviously need sticky tires but i am wondering if I will be able to hook well enough with radials. I plan to spray a 150 shot next time. Should get me into the 12s if I can get rid of the tirespin. I have a transbrake too but haven't used it yet for obvious reasons. By the way this is the truck. An 85 GMC with stock rear suspension

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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 06-24-2009, 10:14 PM   #2
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Re: Drag radials or slicks

I'd go with a full slick.
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Old 06-25-2009, 12:00 AM   #3
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Re: Drag radials or slicks

Quote:
Originally Posted by Jim_PA View Post
I'd go with a full slick.
I agree, at very least a DOT slick like a QT-Pro or a ET Street.
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Old 06-25-2009, 12:11 AM   #4
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Re: Drag radials or slicks

I'm going from a ET street to a ET Street radial. Why?

I can get more contact patch with less side wall
Radials tend to have a touch more mph.
Slicks aren't street legal.

Either tire can work well, it's all in the set up. What works for a slick, may not work for a radial.

There are guys cutting 1.3x's on drag radials. Here is an example: http://www.wolferacecraft.com/7s.aspx
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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Old 06-25-2009, 07:12 AM   #5
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Re: Drag radials or slicks

My buddy has been 1.57 in a 67 camaro with slapper bars and a drag radial. This is a street car that we drive to the track.

At the orsca race the other day a mustang went 4.67 in the eighth on a drag radial.
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My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4

So Far my best Times are:

Motor only:
6.44 1/8 @ 104.13
10.39 1/4 @ 125.83

Nitrous Times:
5.785 1/8 @ 118.65 with a 1.336 60ft
9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!
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Old 06-25-2009, 10:26 PM   #6
85_prairieboy
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Re: Drag radials or slicks

The only thing is if I go with a full slick I have to buy another set of rims because the truck does get driven. I plan on narrowing a 9 inch and using a wide slick hopefully for next year so what I buy now will get me through the rest of the year. If I do buy drag radials and still spin I am no further ahead. Man I may have to flip a coin on this one. One of the reasons I am wondering if a drag radial will be good enough is a dilemma I have with my current suspension. I only have an inch of travel before my rear end hits the bumpstops. I can even see it in the videos my brother took. The truck starts to squat and then bottoms out the suspension and almost bounces back. It seems like that unloads the tires and they spin worse. I don't know if drag radials would do the same thing or not. Maybe any tire would do the same thing. Or maybe I am overthinking this
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 06-26-2009, 06:25 AM   #7
hotrod 80
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Re: Drag radials or slicks

Do you drive it to the track or trailer ? I like a drag radial for a friday night street car deal . Just show up and your ready . Ive driven in and changed to slicks , it's a pain , locking up you tires , tools and jack to a light pole . I have a trialer also . To me it is alot funner to drive in on a drag radial , tech in and go make passes . I have always run the minimum tire i can and still get the job done .
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Old 06-26-2009, 09:16 AM   #8
85_prairieboy
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Re: Drag radials or slicks

Quote:
Originally Posted by hotrod 80 View Post
Do you drive it to the track or trailer ?
The nearest track is 3 hours away so I trailered it in case I broke
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 06-28-2009, 08:08 PM   #9
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Re: Drag radials or slicks

It sounds to me like you might need a little suspension work. My old 70 would 60' at 1.76 on Dunlop 275/60-15s at 3950lbs.with me in it.It was a coil spring rear setup though.Good luck
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Old 07-04-2009, 12:19 AM   #10
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Re: Drag radials or slicks

Quote:
Originally Posted by 85_prairieboy View Post
I only have an inch of travel before my rear end hits the bumpstops. I can even see it in the videos my brother took. The truck starts to squat and then bottoms out the suspension and almost bounces back. It seems like that unloads the tires and they spin worse.

You are going to have the same issue with a slick. Perhaps notching the frame is an option or building some adjustable LCA brackets and induce antisquat.
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------Motor---------------Bottle
60'---1.53---------------1.41
1/8---6.58 @ 105.92----5.87 @ 118.41
1/4---10.38 @ 126.97----9.24 @ 142.49
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Old 06-26-2009, 07:55 AM   #11
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Re: Drag radials or slicks

Maybe I wouldn't have problems with drag radials either, but I didn't want to find out the hard way that I couldn't hook with them.

I think the only drag radials actually recommended for street use are the BFG's and Nitto's, most other drag radials I've read about wear and drive horribly on the street.
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Old 06-26-2009, 09:00 AM   #12
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Re: Drag radials or slicks

M/Ts drive fine on the street -put air in them!
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Old 07-06-2009, 02:08 PM   #13
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Re: Drag radials or slicks

I picked up some M/T ET Drags. The price was right and I am towing the truck back and forth so I figured I might as well. I am heading to the track on Friday so hopefully I will come back with good news. I plan on doing some suspension work this winter so these will have to do for now
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 07-06-2009, 04:26 PM   #14
djracer
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Re: Drag radials or slicks

Can you not cut the bump stops off some?
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Kevin

Special Thanks to All who have helped on the TRUCK!

My Pass Time Show http://s129.photobucket.com/albums/p...Chapter1-0.mp4

So Far my best Times are:

Motor only:
6.44 1/8 @ 104.13
10.39 1/4 @ 125.83

Nitrous Times:
5.785 1/8 @ 118.65 with a 1.336 60ft
9.168 1/4 @ 142.58 with a 250 shot dead out of the hole!
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Old 07-06-2009, 05:16 PM   #15
Ont67shortbox
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Re: Drag radials or slicks

I agree with DJ,I cut my bumpstops and have over 3 inches clearance now.What are you running for a rear , if your going to use a slick .
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Old 07-06-2009, 07:53 PM   #16
85_prairieboy
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Re: Drag radials or slicks

Yeah I guess I could cut the bumpstops. I wont be out anything.

The truck has the stock 8.5 inch with a set of Richmond 3.42s and a spool. I know it might break but I want to see what I can get it to handle. My cousin was running low 11s in his 76 Camaro with the factory 8.5 inch and slicks so I think the truck should survive for a few more passes. I don't think I am going to spray it off the line. Maybe towards the end of the season
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 07-06-2009, 08:14 PM   #17
Ont67shortbox
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Re: Drag radials or slicks

i was more worried about c-clips or F**d ends,too nice of truck to tear up the quarter with an axle,wheel and tire.
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Old 07-06-2009, 11:29 PM   #18
hotrod 80
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Re: Drag radials or slicks

Slicks would be the way i would go if towing also . Imo the softer side wall will help with bad suspension also .
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1979 Firebird Flooded in Harvey
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Old 07-13-2009, 01:28 PM   #19
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Re: Drag radials or slicks

The slicks worked perfect. I will post a video as soon as I can. I ran a best of 12.74 at 104. 1.82 60 foot. That was a nitrous pass. The nitrous didn't help as much as I thought a 150 shot should so I put a gauge on the bottle and it showed 600 psi. It was a cool evening.
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 07-15-2009, 02:50 AM   #20
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Re: Drag radials or slicks

Need more bottle pressure depending on your set up . I ran 63/71 with 5.75 psi fuel pressure and around 900 psi with a NOS cheater and had good luck .
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1949 5-window
1969 Camaro
1976 Chevy Luv yellow
1978 Chevy Luv Blue
1976 Chevy Luv Black
1979 Firebird Flooded in Harvey
1999 F350 Dually
2005 GMC Sierra 4.8 RCSB
2014 Explorer (wifes)

My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148

Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583

Last edited by hotrod 80; 07-15-2009 at 02:51 AM.
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Old 07-16-2009, 01:51 PM   #21
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Re: Drag radials or slicks

I am going to mount a pressure gauge on the bottle and get a bottle warmer. Just for kicks I revved the engine to 3000 and manually hit the switch and the rpm didn't really jump up. They did climb but not like I thought. That was on that cool evening with the low bottle pressure. A bottle with two passes on it by the way. I figured I should be able to gain more than 5 mph with a 150 shot. I went from 99 to 104. Not using slicks on the 99 mph pass either
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 07-16-2009, 07:34 PM   #22
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Re: Drag radials or slicks

Quote:
Originally Posted by 85_prairieboy View Post
Just for kicks I revved the engine to 3000 and manually hit the switch and the rpm didn't really jump up.
Just a tip never rev the motor to test the nitrous. You are asking for trouble there.
Second check out a NANO system. It is basically a pressure regulator. As long as it's not to hot and there is nitrogen or similair gas in the NANO tank your nitrous pressure will always be correct. You don't have to wait for the heater, just hit it.

NANO=Nitrogen Assisted Nitrous Oxide.
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Old 07-20-2009, 07:46 AM   #23
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Re: Drag radials or slicks

[QUOTE=Wild83C10;3416059]Just a tip never rev the motor to test the nitrous. You are asking for trouble there.


Not trying to start any trouble , but i have a " bang button " and a air/pressure/visual purge . I always "rough purge" the bottle with the visual ,then purge through the motor in short blasts above 3000 rpm to find the sweet spot on bottle pressure . I usually never purge through the motor more than 3 times a pass . This is dangerous if not done properly ! . Once you find the spot you can get there quicker and be more consistant . The purge takes some variables out of it . I always try to have extra pressure to adjust it down with . Just my style .
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1949 5-window
1969 Camaro
1976 Chevy Luv yellow
1978 Chevy Luv Blue
1976 Chevy Luv Black
1979 Firebird Flooded in Harvey
1999 F350 Dually
2005 GMC Sierra 4.8 RCSB
2014 Explorer (wifes)

My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148

Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583

Last edited by hotrod 80; 07-20-2009 at 07:47 AM.
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Old 07-21-2009, 12:02 AM   #24
85_prairieboy
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Re: Drag radials or slicks


I finally got my video uploaded. I only got 2 runs in so I was like oh crap when they lined me up against the Charger. I had gotten spanked earlier by my cousin's 406 powered RX7. But it turned out to be a good race and I beat him by a tenth.
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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Old 07-21-2009, 12:05 AM   #25
85_prairieboy
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Re: Drag radials or slicks

Quote:
Originally Posted by Wild83C10 View Post
check out a NANO system.
I'll look into that. It sounds interesting and we have nitrogen at the shop I work at.
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85 GMC toy Lowered, newer box swap, 350 .060 over with AFR 195s, forged pistons, TCI TH350
1.83 60' 13.14 @ 100 on motor
1.49 60' 11.52 @ 116 w/150 shot

1952 Chevy truck project
1980 Z28 Camaro
1967 Camaro drag car 10.60@126
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