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Competition Diesel racing, sleds, dynos, power tuning and max performance.

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Old 08-28-2011, 09:03 AM
mustang_gt_350 mustang_gt_350 is offline
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Rear spring setup for sled pulling.

Ok, here are the only rules that i can find about suspension

* No traction bars or air assisted Load Levers.

( Stock Suspension only) Spring Clamps allowed.


So, with that said, Any idea's other than adding a few leafs and clamping them? Its on a 79 half ton so i can add a good many leafs to the pack to get caught up with the 3/4 and 1 ton trucks. As i don't see a rule saying how many you can run and a few of the trucks i have seen have probably atleast 7-8 if not more.

looking for some tricks that maybe i don't know about. It can not be blocked.
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Old 08-30-2011, 12:45 PM
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Cannot be blocked as in solid, the way I see it. Clamp both front and back of the spring and make stops from the frame rail over the axle that you can bolt in and out to limit the axle travel to 1 or 1.5 inches. Most rules will limit you to a minimum of 1 inch travel.
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Old 08-30-2011, 02:41 PM
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Quote:
Originally Posted by Maxium4x4 View Post
Cannot be blocked as in solid, the way I see it. Clamp both front and back of the spring and make stops from the frame rail over the axle that you can bolt in and out to limit the axle travel to 1 or 1.5 inches. Most rules will limit you to a minimum of 1 inch travel.
I asked about that rule at the last pull. No solid means no blocks even with travel. So there cant be anything solid that limits the travel of the rear. So it looks like all i can do is build up the springs and clamp them. I'm thinking about doing that and reversing the shackles to lift up the rear a little higher so when it does squat it doesnt pick up the front end as much. That seams to work with my powerstoke.

Side note, any way to soften up front coil springs to drop the front end down even more?
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Old 08-30-2011, 02:44 PM
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Here is a vid, you can see how much its allowing the rear to squat and picking up the front corner.

Small block showroom Mcconnellsburg orlo - YouTube
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Old 08-30-2011, 04:07 PM
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I like to push the rules, just what are they.... You keep picking the rear up but you have a hitch height rule, so pack the springs and clamp them. Not sure on the front, find a shorter coil or cut a little until you find the rake you want would be my guess. Are you hanging weight anywhere? Move everything you can to the front of the truck.
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Old 08-30-2011, 06:43 PM
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Quote:
Originally Posted by Maxium4x4 View Post
I like to push the rules, just what are they.... You keep picking the rear up but you have a hitch height rule, so pack the springs and clamp them. Not sure on the front, find a shorter coil or cut a little until you find the rake you want would be my guess. Are you hanging weight anywhere? Move everything you can to the front of the truck.
Rules - ORLO INK. Truck & Tractor Pullers

Small block showroom.

Part of the reasoning for lifting the rear is it has a very low hitch hight now. I don't have an adjustable hitch made for it yet. So i want to see how the truck responds to lifting the rear and dropping the front before i see what hitch hight it likes too. Right now with a straight hitch i think its only 16" i beleive we are allowed 26" but i will have to check.. I do know we are allowed 27% of the wheelbase for the hitch. Because i asked and the tech guy and i measured both the wheelbase and where the hitch could be and it puts it pretty far under the bed following the rule. So i'm going to work on moving that tomorrow and make some calls to see if i can find anyone around that has spring packs laying around that i can tear apart to stack hers (its my g/f's truck) up before the 7th.

I wasn't sure if i could cut the coils in front or not. I had read about heating up the coils with a torch to where they start to sag and set it that way but i'm not sure how that will affect the coils. I probably won't mess with that until last if at all, was just asking while i had a post on the subject.
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Old 08-30-2011, 07:09 PM
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You want the hitch right at the limit, from the center of the housing to height. Stock suspension only, final ruling left to the officials. I would push the blocking in the rear but that is me. The block modifies the frame not the suspension, but since they said no.... Get all the weight you can think of to the front of the truck. Where do you weigh in at?
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Old 08-30-2011, 07:23 PM
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Quote:
Originally Posted by Maxium4x4 View Post
You want the hitch right at the limit, from the center of the housing to height. Stock suspension only, final ruling left to the officials. I would push the blocking in the rear but that is me. The block modifies the frame not the suspension, but since they said no.... Get all the weight you can think of to the front of the truck. Where do you weigh in at?
Her in the truck with half a tank is 6k. thats with the bed loaded as far forward as possible with scrap steel and concrete lol.
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Old 08-30-2011, 07:27 PM
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Your in the 6500lb class right? Always use the scales at the pull so you are not over or under.
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Old 08-30-2011, 07:32 PM
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no its 6k for smallblock showroom. And yeah I usually have it within 80lbs of the max. I tried it with no weights vs weights and it made a huge difference. I know some trucks that don't like having weights but this one does. I'll see what i can do with the hitch and springs tomorrow and if i can find some extra leafs i'll add them. And she can give it another test next week. Maybe she will be able to pull out in 2nd. She's still learning to pull and drive a standard at the same time, so i'm not in a huge hurry changing things as she still has some error on the driving side. Its a growing combo, the truck will get better as she does.
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Old 08-30-2011, 07:37 PM
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OK my bad on the weight. Seen to many trucks not use the scale then go over and the fight is on.......
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Old 08-30-2011, 10:51 PM
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lol, they make everyone go over the scale right before the class lines up, and they usually either check the hitch hight on the scale or after you back up to the sled right before the drop the hook onto the hitch.
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Old 09-05-2011, 04:28 PM
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F650 springs work well. Just watch your back when lifting them, they're heavy as hell
just make sure you got a matched set of rear springs whichever way you go.
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