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Author Topic:   Spring on Housing ?
Kromulous
Dirt Forum Champ
Total posts: 796
posted May 19, 2004 03:42 PM  
What does putting the RR spring on the housing coupled to a jackplate etc do for a car? More FWD bite? better turn in?

I have seen this, but no idea what it does or what kind of suspension systems its best suited for. My car is a 4 bar car and i am wondering if its worth a try.

Any info would be appreciated, thanks.

FASTLAP
Dirt Maniac

Total posts: 171
posted May 19, 2004 06:55 PM  
It's main objective is that it just holds that end of the car up. It doesn't get loaded by a birdcage through indexing and so forth like traditional 4 bar suspensions do. I run it on a zlink rr.

Kromulous
Dirt Forum Champ
Total posts: 796
posted May 20, 2004 06:58 AM  
I guess what i am asking is, does it feel better, faster at all?

One advantage i see right off is adjustability. As well there might be an advantage of non indexing the coils, not sure.

**** , guess i'll weld one up and just try it out.

boas51
Dirt Maniac

Total posts: 190
posted May 29, 2004 07:37 PM  
i just did exactly that, tonight, i will let you know how it works after tomorrow. i had the rr on the front of the birdcage before, on a slider.

Jwhit5402
Dirt Newbie

Total posts: 1
posted May 30, 2004 10:43 PM  
Anyone ever try a spring on housing set up with a 4 bar (both sides) ?

Just wondering if its worth welding it all up to try.

Seems like alot run the spring on housing with right rear Z-Links, but never seen one on a straight 4 bar car.

FASTLAP
Dirt Maniac

Total posts: 171
posted May 31, 2004 05:42 AM  
quote:
Originally posted by Jwhit5402:
Anyone ever try a spring on housing set up with a 4 bar (both sides) ?

Just wondering if its worth welding it all up to try.

Seems like alot run the spring on housing with right rear Z-Links, but never seen one on a straight 4 bar car.



I've just started wondering the same thing! Let me know if you hear anything, or try it out.

Kromulous
Dirt Forum Champ
Total posts: 796
posted June 01, 2004 01:03 PM  
No one runs a spring on housing with a std 4-bar setup?

zeroracing
Dirt Forum Champ
Total posts: 1875
posted June 01, 2004 04:43 PM  
it would take away indexing which is a mjor benifit to running a 4link.

boas51
Dirt Maniac

Total posts: 190
posted June 02, 2004 06:37 PM  
we were rained out on the weekend, but had a test at another track.
i changed from spring in front on a slider, mounted to the birdcage to spring mounted on the top of the birdcage with a jack bolt.
it only took me an hour and a half to make the bolt, mount and cup.
the car was set up four link both sides, i can change to z on right.
wow, talk about bite! i ran an 11" 200 lbs. spring on top versus the 13" 150 lbs. spring mounted to the front, and was way tighter. the car had incredible forward bite on a slick track.
did not get a chance to go back to the spring mounted on eliminator, because of engine problems, but from previous laps on this track i concluded the spring on top made better forward bite.

driver27
Dirt Maniac

Total posts: 194
posted June 03, 2004 07:02 AM  
Any chance of someone showing a picture of the spring on top setup? For some reason Im having trouble picturing how the spring will actually sit on the housing with the birdcage still there. Any help appreciated.

washeduptoo
Dirt Maniac

Total posts: 155
posted June 03, 2004 08:26 AM  
I don't know if we did it right, but we mounted the spring on a seperate spring perch on the rearend next to the z-link, maybe this will help you.

i8uracing
Dirt Roller

Total posts: 18
posted June 03, 2004 08:35 AM  


 
Here is how Richard (Custom Performance) did mine. There is a stud welded to the top of the bird cage and a spring cup is placed on top of that.

Kromulous
Dirt Forum Champ
Total posts: 796
posted June 03, 2004 08:45 AM  
Boas51, did you mount the spring right to the Bird cage (on top) or the axle housing itself ? If so how ? off a spring perch of some kind bolted to the bird cage i imagine.

I was thinking of running it slightly inboard of the bird cage on the housing (axle housing) on a spring perch like they use on a Z-Link set up. Check out Bob Pierce Race cars for some shots of it.

driver27
Dirt Maniac

Total posts: 194
posted June 03, 2004 09:54 AM  
i8, is that birdcage mounted solid to the rearend housing, ie not floating? Is it possible to mount the spring to the top of a floating birdcage, or is that defeating the purpose? I think im confused again, even tho thats not hard to do...

i8uracing
Dirt Roller

Total posts: 18
posted June 03, 2004 11:15 AM  
It is mounted to the "floating" bird cage. I am unsure of what the benifits might be between having it mounted on the bird cage or mounting straight to the housing. There is probable less front to back movement do to axle wrap by having it on the bird cage.

CUSTOMPERFORMANCE
Dirt Forum Champ
Total posts: 1172
posted June 03, 2004 01:08 PM  
I8 chassis is a wishbone rear link with the birdcages and the springs on top as he described. He has just ran it once or twice but due to muddy conditions hasnt got to really get a feel for it.

WPP
Dirt Freak

Total posts: 451
posted June 03, 2004 07:09 PM  
On that wisbone rear suspenion is the frame mounts on the chassis centerline on the rearend or below centerline thanks

boas51
Dirt Maniac

Total posts: 190
posted June 04, 2004 08:11 PM  
i mounted mine directly on top of the birdcage. the spring itself sits on the birdcage, there is no spring cup. i simply stitch welded a 1" long piece of 3.5" tubing to the top of the birdcage to locate the spring.

CUSTOMPERFORMANCE
Dirt Forum Champ
Total posts: 1172
posted June 04, 2004 09:15 PM  
Below centerline of rearend and left side is shorter than the right;.

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