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Author Topic:   HAS ANYONE RAN A 112 INCH WHEEL BASE CAR
dirtslinger66
Dirt Full Roller

Total posts: 52
posted November 11, 2001 08:18 PM
WANTING FEED BACK ON A 112 INCH WHEELBASE MOD PROS AND CONS THANKS

x13jc
Dirt Maniac

Total posts: 191
posted November 12, 2001 08:38 AM UIN: 27426975
I think that Rick Hite runs one that he builds himself. He won a couple big races at Muskingum this year. I talked to him and he indicated that on a dry slick track, you couldn't beat it. Not much else that I can recall. Hope this helps.

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RACERX

awkwardjeff
Dirt Freak

Total posts: 390
posted November 12, 2001 10:54 AM
Well, the pro's are this.....because of the rules the 72 inch from center of rear axle to back of motor.......by running the long wheel base you get the rear percent up there. It works like moving the whole car back on the wheel base. It also depends on what is different in the chassis to make the wheel base longer.

The con's on a long wheel base car is the turning radius.......almost never will it turn around the bottom of the track.

The older Mods running under the old rules of Wissota and IMCA used to more the front wheels forward making the wheel base 110-111 was very common. The new cars of today are built with enough rear PERCENTAGE WITHOUT HAVING TO MOVE TO FRONT WHEELS FORWARD.
If you are thinking of building your own chassis and using a longer chassis it will be a tuff deal to get a handle on.


smayo964
Dirt Forum Racer

Total posts: 90
posted November 12, 2001 12:54 PM
Awkwardjeff, curiosity question concerning getting the longer wheelbase car to turn. If the car was setup as a 4-bar, or 3, with enough rear steer, or the center of gravity was high enough to get the chassis to roll over to get the rear to hang out a bit, would that not make up for the handicap in wheelbase? Granted, we all know that the tighter wheel base has better turning radius, but could not the same effect be achieved with rear geometry on the longer car? Just curious. Thanx.

awkwardjeff
Dirt Freak

Total posts: 390
posted November 12, 2001 03:20 PM
To give you the short answer YES.......What I was refering too was the older cars with the stock rear suspension rules. If you were to build a NEW car I don't see the need to move the front wheels forward, you can build in enough rear percent without moving the wheels forward.

Another thing about a long wheel base car and compensating by adding more rear steer or changing the roll center to add more body roll, thus adding more steer.....NO matter how you add rear steer, either by shorter arms , or steeper angles.....you will create more problems than you solve.......A car like this would be EXTREAMLY sensitive to ride hieght changes, roll center changes...it wouldn't be very forgiving on set up. If you missed the mark on set up you would be out to lunch while the other cars drove by..........

quote:
Originally posted by smayo964:
Awkwardjeff, curiosity question concerning getting the longer wheelbase car to turn. If the car was setup as a 4-bar, or 3, with enough rear steer, or the center of gravity was high enough to get the chassis to roll over to get the rear to hang out a bit, would that not make up for the handicap in wheelbase? Granted, we all know that the tighter wheel base has better turning radius, but could not the same effect be achieved with rear geometry on the longer car? Just curious. Thanx.

dirtslinger66
Dirt Full Roller

Total posts: 52
posted November 12, 2001 04:51 PM
The reason I am asking is that I am looking at a new Racemart FR1 with 112" wheel base.

wfoondirt
Dirt Freak

Total posts: 242
posted November 12, 2001 05:37 PM
Typically i have found that the long wheelbase cars work well on larger tracks, they seem to be alot more stable. Currently thats all i run is a 112 wheelbase car everywhere i go, i used to have a 108" car that i used on a couple small stop and go bullrings, but there aren't enough of those around here anymore to make it worth having. I think its exaggerating a bit to say that the long wheel base wont go around the bottom, i do aggree that it probably does help somewhat to have a short wheelbase on a tight bullring. As far as adding rear steer ect to make the car turn, i'm with jeff on saying that it makes the car too sensitive and unpredictable.

eagleii
unregistered Total posts: 242
posted November 13, 2001 04:25 AM
All,

That's all we build anymore is the 112" cars. I agree with Wfoondirt, the cars are VERY stable in all aspects when set up right. They are smooth, have a lot of rear percentage, and can run anywhere on any track.

I disagree with AwkwardJeff, that they won't stay on the bottom, but agree with him that they must be set up to run there. We have found some happy mediums that do well everywhere on the track. High, low, or middle.

As with any race car suspension, it must be tuned to the task it is asked to perform. We build a variety of rear suspensions for these cars and have had nothing but glowing feedback on them. 3-Link, 4-Link, Swing Arm, Swing Arm/Z-Link, Clamped Z-Link, 4-Link/Z-Link/Wishbone Combos, etc. They all perform very well with a 112" wheelbase.

I think you would be happy with one.

Jerry
Eagle Chassis & Fabrication

mod27
Dirt Full Roller

Total posts: 72
posted November 13, 2001 09:04 AM
dirtslinger66, get ahold of Tim Folkerts of Albia Iowa, his new FR-1 is the 112" wheelbase car. I am sure he will fill you in on how it handles, i have a FR-1 and have seen Tim's new car run, to me the 112" wheelbase car looks to be smoother but really havent got to watch it much to decide if i would want to change wheelbase yet. No matter which car you get the 108 or 112, the FR-1 is a god car either way. You wont be disappointed...

cleatus
Dirt Full Roller

Total posts: 58
posted November 25, 2001 05:57 AM
DirtSlinger, I ran a 112" stockcar once basicly it was the only thing I had left in the back yard to run.Normally I ran between 101" and 108" cars. I ran this thing as a joke on the 1/2 mile at Manzanita. It was the biggest ugliest car I had ever seen. BOY what a blast, that thing had more forward bite than anything I had ever been in, more than once I lifted coming out of turn 2 think there was a yellow flag by the way I was passing cars coming off the corner. Personaly, I would go with longer wheel base

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