Dirt modified rear suspensions..... what's the difference
Posted 27 November 2007 - 05:27 PM
KB Motorsports #17g
Posted 27 November 2007 - 07:47 PM
A 4 link is where the rear end has an upper and lower trailing arm (bar)that goes form the axle center line forward in the car. One is "above" the axle and one is "below" the axle. See picture below:
A z-link has one bar going forward in the car, this bar is on the bottom of the axle. It then has a bar going backwards in the car and is above the axle. See picture below (this is actaully a swing arm design):
A 2 link is more common on asphalt and I think that any Howe car illustrates the 2 link well (sorry no picture). Hope this has helped and pardon the dust and dirt on the car in the pics, I still haven't cleaned my car yet...
Posted 27 November 2007 - 08:00 PM
Scooters the man.. he even ran out and took ya some pics He knows his stuff too.
Posted 27 November 2007 - 08:16 PM
Yeah I think that "Rob" has commented on the car for sale on George's forum,here is the quote:
Sounds like a nice mod for the price....too bad I have all my money wrapped up this year, I'd buy it and go back to dirt!!!
I'm still amazed we haven't sold it yet... And yes it is a 4 bar z-link combo.
Posted 28 November 2007 - 08:06 PM
Thanks again for the info Scooter.
KB Motorsports #17g
Posted 29 November 2007 - 07:12 AM
"I've always been fascinated with mods.....they are different...."
As have I Rob, as have I. Try it once and you won't look back.
have a good day,
Posted 30 November 2007 - 07:33 PM
I think it should be pointed out that the picture that Scooter has posted of a "Z-link" is actually a "Z-link Swingarm". A true Z-link does not have the spring mounted on the forward trailing arm, but rather a straight trailing arm like the upper control arm and the spring either on top of the housing, or set up as a coil-over on the front or rear of the bird cage.
The suspensions can be ran in any number of combinations. You can have a 4 link LR & 4 link RR... Z-link both sides... 4-link LR 3 link RR.... floated on birdcages or clamped up. The dirt cars are far more exotic than the asphalt cars and thats what I like about the challenge of setting a car up on dirt.
I believe that if you can get the set-up perfect a 4 link on both sides promotes the best traction and is the fastest, but it is an extremely touchy set-up and you have to have one smooth driver.
On top of the different style links you got your choice of short panhard bars, Jbars, or rear mounted pan hard bars. Different length pull bars, biscuit style, 2 way spring pull bar, etc etc. It goes on and on.
Posted 30 November 2007 - 10:35 PM
Its complicated and thats why you have to pay attention to what you are doing, but once you get used to it it isn't so bad.
I've spend the last 4 years working on different style dirt suspension on dirt mods and dirt late models and still don't have it all straight because there are just so many combinations you can run.
I prefer the 4-Z set up myself because it seems to work at just about every track you go to. While some guys with 3 links do just fine at other tracks for the reason they run at that 1 track all the time. The 4-Z just seems to work well everywhere when your traveling.
Posted 03 December 2007 - 12:15 PM
I know that the 4bar is the hot setup and had it on my Jet,, but if I were going back to dirt (?) I think I'd really look at a mono leaf again and just adjust the rear setup with the right foot.
Just my 2 cents.
Posted 04 December 2007 - 06:30 AM
KB Motorsports #17g
Posted 04 December 2007 - 02:35 PM
Posted 05 December 2007 - 01:00 PM
Posted 05 December 2007 - 03:14 PM
The Fast Boys set up is incredibly fast, but for short periods only. There is so much pinion angle and stress on the chassis that guys are sheering gears, U-joints, bending their chassis, etc etc that you better have a fat wallet to maintain a fast boys set up.
But then in UMP I only seen the inspectors 1 time all year up at Thunderbird and the only things they checked were the spoiler and body panel lengths. Didn't even bother with checking for any kind of traction control or whether the dummy shock we had on was a real shock or not etc etc.
Are leaf springs used much if any on asphalt? (Other than Camaro Street stocks)
Fast Boys Set-Up At Work:
Number of downloads: 78
Posted 05 December 2007 - 03:25 PM
Posted 05 December 2007 - 03:52 PM
How did you correct the dynamic pinion angle issue? Run very little static angle to begin with?