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4-lbar/z-link setup?

Questions, suggestions and tips.

4-lbar/z-link setup?

Postby knightracing26 » Tue Jan 04, 2011 12:40 pm

was going to run 4bar/zlink on the right side this year on my modified. just curious on were to run the springs and shocks..slider or coil over. on the zlink side do u run the swing arm link? do i clamp any of the suspension to the housing? any info would be appreciated. its a copy of a american made..it was gary vandermarks modifed if that helps any

thanks eric knight
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Re: 4-lbar/z-link setup?

Postby Spi-nex » Tue Jan 04, 2011 3:25 pm

If you run the swing arm you'll have to put spring in front on the trailing arm.

If you run just a straight Z-link you'll put the spring on the back side of the birdcage.

Your going to have vastly different spring rates depending which way you want to go. You'll need around a 450# RR spring on a swing arm, or 200# on a straight Z.

No clamping is necessary.

Basically, the difference between the two set-ups is driving style. Jeremy Ferguson ran the straight 4-Z for years and was very successful with it. Rotates the corner very well if you let it hand out. A swing-arm set-up requires the car to be driven more "square." I've seen both set-ups work very very well.
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Re: 4-lbar/z-link setup?

Postby knightracing26 » Tue Jan 04, 2011 3:32 pm

on the zlink side then do i run a coilover just on the back side. then a slider on the the left side behind and the shock in front?
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Re: 4-lbar/z-link setup?

Postby Spi-nex » Tue Jan 04, 2011 4:02 pm

knightracing26 wrote:on the zlink side then do i run a coilover just on the back side. then a slider on the the left side behind and the shock in front?


Yes sir. There are other ways of setting that up, but that is the most common/successful variation.
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Re: 4-lbar/z-link setup?

Postby knightracing26 » Tue Jan 04, 2011 4:06 pm

well thank u much...this is my second year in a modifed, actually racing also and we ran 3 link,dont have any expereance in the 4 bar area. my dad raced modifieds back in the 90's but that was before all these radical set ups. so we are both in the dark...lol
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Re: 4-lbar/z-link setup?

Postby Spi-nex » Tue Jan 04, 2011 4:11 pm

knightracing26 wrote:well thank u much...this is my second year in a modifed, actually racing also and we ran 3 link,dont have any expereance in the 4 bar area. my dad raced modifieds back in the 90's but that was before all these radical set ups. so we are both in the dark...lol


Keep it simple with the 4-Z until your comfortable with the changes you make. Very easy to dial yourself out.

Spring wise... I'd start out with 200# straight across the back.
650# in the LF and 625# in the RF (yes softer in the RF).

For shocks... I would contact Alan at SpeedyShocks.com and have him valve you up a "dry slick" package if your going to be racing in Michigan.
Last edited by Spi-nex on Fri Jan 07, 2011 4:26 pm, edited 1 time in total.
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Re: 4-lbar/z-link setup?

Postby Francis [Bot] » Wed Jan 05, 2011 1:17 am

I don't think you will want to be that soft in the front unless you have Nova Lowers. If your chassis is equiped with the metric lowers still, then you will need to go stiffer. around a 900 and 850
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Re: 4-lbar/z-link setup?

Postby Spi-nex » Wed Jan 05, 2011 1:24 am

747jet wrote:I don't think you will want to be that soft in the front unless you have Nova Lowers. If your chassis is equiped with the metric lowers still, then you will need to go stiffer. around a 900 and 850


Agree 100% with Jamie.

We have always used Nova lowers.
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Re: 4-lbar/z-link setup?

Postby knightracing26 » Wed Jan 05, 2011 9:02 am

just asking but why???is it because diffrent width? just curious
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Re: 4-lbar/z-link setup?

Postby XL » Wed Jan 05, 2011 11:49 am

I think it is the angle of the spring
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