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post #1 of 6 Old 08-13-2016, 10:05 PM Thread Starter
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Mini tube or 4 link

I just bought a 90 GT car. It already has a 8.8 from a newer car. I have to shorten it to ditch the joe dirt look. Should I go mini or full 4 link? What are the limits of the stock 4 link? I'm already tearing everything out and putting new ends on the 8.8 not sure if the 4 link would be better.

Car will be low 11 to high 10 second car for a year or two before I get crazy with the motor and go for 8's. Weight reduction is a really important goal for the car.

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post #2 of 6 Old 08-13-2016, 10:20 PM
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Keep the stock 4-link. The stock 4-link has gone 7's in the 1/4 so you can certainly make it work.


ks



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post #3 of 6 Old 08-15-2016, 10:26 AM
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Originally Posted by KEVIN$ View Post
Keep the stock 4-link. The stock 4-link has gone 7's in the 1/4 so you can certainly make it work.


ks

7's?

they have been bottom 6's with stock style suspension



you can go plenty fast with the stock suspension and it keeps a lot more resale value at that point.

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post #4 of 6 Old 08-15-2016, 10:45 AM
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7's?

they have been bottom 6's with stock style suspension
you can go plenty fast with the stock suspension and it keeps a lot more resale value at that point.
I know. But he's only going 8's so why push it.

ks


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post #5 of 6 Old 08-16-2016, 10:12 PM
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I did a full rear subframe, with a drag race specific 4 link (2x3 tube subframe) in a Maverick, and the car lost 133 lbs of weight. A lot of it was from the stock floor removal...and heavy leaf spring removal. I have also done a '69 Chevelle original big block car, that one went from the stock rear suspension and a well built 12 bolt to a 4 link, 15x33's on decent wheels (not lightweight stuff here), and a 9" with discs and that car lost 218 lbs total. I would have thought it'd have been a lot less than that being that the 9" is a little heavy.

Later on I also put an aluminum center section and aluminum spool, and Aerospace brakes on the rear of mine and there went another 87 lbs.

You can make a fox body really light if you plan it correctly. My 347" '85 coupe is right around 2490 + driver (who is about 160), and it's stock 4 cylinder brakes on front and Metric discs on rear. Aerospace on all 4's plus the aluminum chunk in the rear should be worth close to 130 lbs alone. The car is not really worth putting that kind of money into, however. And that is using the stock style triangulated 4 link.

I think a lot of people forget about the importance of weight reduction. Years ago I remember a Hot Rod article where they took a car and started taking parts off and out of it and logging the weight reduction and ET improvement. A bone stock engine and transmission mind you. I seem to remember they got the turd into the 12's down the 1/4 mile just by removing weight, but it was not pretty.

The class you plan on running may have a bearing on your decision too. Some classes require a stock style rear suspension, and if that's the case, a traditional parallel 4 link is out the window. But they flat work and are, IMO, the best option if you don't have the rules stating that you can't run that setup. We're talking full tub, big tires (if you want) and everything. Which reminds me. A certain local class that they called "10.5 outlaw", it's rules stated the tires had to be 10.5" and that the rear suspension had to stay the same design as it originally came with. Well fox body cars came with 4 links. So guys were gutting the whole rear and putting in a full drag-race style 4 link, with 31x10.5W's. It flew with the rules. The original was a 4 link too, although triangulated and not parallel. Didn't matter, it was within the rules. Those guys were running mid 4's back in the day before turbo's got popular, and now most of 'em are turbocharged and can't get down the track due to entirely too much power for the surface. I acutally won the class once with a 5.66 in my rust bucket that might've made 800 hp. My competitor was well north of 2000hp but couldn't get it down the track. 'Course it helped that I treed him big time

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post #6 of 6 Old 09-09-2016, 06:53 AM
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I did a full rear subframe, with a drag race specific 4 link (2x3 tube subframe) in a Maverick, and the car lost 133 lbs of weight. A lot of it was from the stock floor removal...and heavy leaf spring removal. I have also done a '69 Chevelle original big block car, that one went from the stock rear suspension and a well built 12 bolt to a 4 link, 15x33's on decent wheels (not lightweight stuff here), and a 9" with discs and that car lost 218 lbs total. I would have thought it'd have been a lot less than that being that the 9" is a little heavy.

Later on I also put an aluminum center section and aluminum spool, and Aerospace brakes on the rear of mine and there went another 87 lbs.

You can make a fox body really light if you plan it correctly. My 347" '85 coupe is right around 2490 + driver (who is about 160), and it's stock 4 cylinder brakes on front and Metric discs on rear. Aerospace on all 4's plus the aluminum chunk in the rear should be worth close to 130 lbs alone. The car is not really worth putting that kind of money into, however. And that is using the stock style triangulated 4 link.
Weight and plan are key, but cost comes into play here as well... Back halving a car costs $$$, and a good bit of it if you want it done right. A 90 GT rolled off the factory assembly line with a rear suspension MORE than able to offer the same performance, especially at 8 sec power levels.

You don't need a 9" rear.. 8.8's have run in the 7's at over 3200lbs. You don't need carbon in the car either. fiberglass can get you REALLY light. It's about sitting down and planning it out. There was a shop that did a car, a fox coupe. These guys are weight reduction fantics.. Their car, with a full 25.1E cage, but no suspension was 900lbs (before paint. Yes, they weighed it after it was painted as well. Anyway, the end result, was a car that was in order to get to 2490 WITH driver, they would need to put over 100lbs in the car. This was done without a single carbon piece. This is an extremem example, but the point remains.

Plan the work, then work the plan.

Also.. stock suspension can run just as hard as a 4 link in the right hands. One of the hardest 60'ing cars I know of on a small tire (275/50) sits on a leaf spring!

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