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Author Topic:   Best new rear suspension???
ScottGreer
Dirt Full Roller

Total posts: 62
posted October 08, 2001 12:16 AM
We run a Wissota Mod up north here(IMCA car with racing tires on it) and are looking to change over to a link suspension. We currently run an mon leaf/coil car with a torque arm. So far our number 1 idea is a 4-link/ z-link car, have used 4-links in the past and are quite familiar with them. But there are only a few of these cars around here, and they are wicked quick some nights, while others they are midpack. The most popular car seems to be a double z-link car build by Jay macdonald at Speciatly Fabricating. Some cars have the LR cage locked, while other float both. They run a very short lower Afco arm, with a common upper. Both using and rubber biscit type pull bar. My main question is do we try to copy the common cars, or go with something extravagant? Has anyone had experience with either of these suspension, preferably the Jay car? Thanks for the time.

jammin
Dirt Administrator

Total posts: 5060
posted October 08, 2001 06:19 PM UIN: 16262997
The whole idea behind a z-link is to eliminate roll steer in a car, not give one forward bite. When the front bar's angles are changed to give you that forward bite, it is almost impossible to get the roll steer correct. It is a touch and go situation. I feel that the z-link can be somewhat effective on the RR but not on the left. Weight transfers to the RR spring irreguardless which makes it get more bite. The left rear has to be pushed in the ground somehow in the turns. There are 3000 different ways to do it. But, I will not run a floated housing modified. There is too much movement lost in the rotation of the rear end that can be utilized to make the car faster. This floating on the RR is what makes the z-link effective in roll steer but doesnt seem to be the answer to me because there is so much more to be gained with different suspensions.

My two cents.

jammin

MOD RACER#93
Dirt Freak

Total posts: 309
posted October 08, 2001 07:12 PM
i agree with you jammin...i think if i had it to do over i would swing arm the lower links...no Z-link..just swing arms.

CHAMP00
Dirt Full Roller

Total posts: 35
posted October 08, 2001 08:42 PM
I've run both and by the seat of my pants I would say a z-link is alot better than a plain swing arm car. My car is on bird cages.I like the z-link much better! jst my 2 cents worth. CHAMP

LITTLEMAN
Dirt Maniac

Total posts: 130
posted October 08, 2001 10:10 PM
the 4 bar left rear and swing arm right rear is whats hot down in our neck of the woods,1st and 2nd in IMCA national points run them and alot of people are finding out that its pretty good to have alittle roll steer with a track tire and limited stagger available. Too much info so little time and money!!!

jammin
Dirt Administrator

Total posts: 5060
posted October 08, 2001 10:14 PM UIN: 16262997
Most people locking the bird cage on the 4 to get dynamic wedge?

wfoondirt
Dirt Freak

Total posts: 242
posted October 09, 2001 09:07 AM
Alot of guys are running the lr spring on the back of the b/c to gain wedge with roll.

36k
Dirt Maniac

Total posts: 103
posted October 09, 2001 04:43 PM
Shouldn't the 4-bar side add wedge with the birdcage indexing,(with spring in right place)

LITTLEMAN
Dirt Maniac

Total posts: 130
posted October 11, 2001 11:28 PM
as a 4-bar index's the weight is taken off the spring if its mounted on the birdcage and applied to the links driving forward on the chassis the spring only real job is to hold the lr up when entering the turn.

Tom Asmus
Dirt Maniac

Total posts: 161
posted October 12, 2001 07:11 PM
I run a swing arm car and its pretty basic here in wyoming under the WISSOTA rules. On dry slick its pretty good and on wet its good with a few changes. I have run against Jay's Specialty Fab cars, they are awesome, that why I am switching to one of his cars for next year. My point for getting one of Jay's cars is how easy they are to set up they dont have many adjusting points and all the cars I ve have raced with, the only way to beat them is to out drive them or wait till the make a mistake.

ScottGreer
Dirt Full Roller

Total posts: 62
posted October 14, 2001 12:35 AM
Just got back from the rained out Wissota Race of Champions, got beat by 2 of Jay's house cars, Craig Thatcher and Pat Doar. Those cars were able to turn down in the middle of the corner where I could't. Maybe the easiest way is to get on the year waiting list and get one of them? Who knows, seasons' over, time to get ready for Christmas.

Thanks for the replys

awkwardjeff
Dirt Freak

Total posts: 390
posted October 14, 2001 12:58 AM
Scott, have you talked to Jay lately? I know Eddie Wakefield ordered a new Jay car last week and Jay told Eddie he would get his new car in February.

I know at this time last year the lead time on a jay car was about a year, But they seem to have caught up.........If that's the car you want give Jay a call.

Goldigger
unregistered Total posts: 390
posted October 14, 2001 02:48 AM
Nice to see your still with us Jeff.

awkwardjeff
Dirt Freak

Total posts: 390
posted October 14, 2001 10:24 AM
Is that comment from me not posting too much lately or from the trip into the wall Friday?

Dirt2race
Dirt Full Roller

Total posts: 40
posted October 14, 2001 10:28 PM
You first have to answer alot of questions before deciding what susp is best for you. The most important is how many different tracks will you be running? Some set-ups transfer from track to track very well, while some require several changes for track conditions, banking, etc. Now, do you have the manpower to make these changes back and forth. I personally don't, so I stick to a simple pullbar with brake floaters. There isn't a magic set-up for everybody, but done correctly, all set-ups can be fast.

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