Imca Sportmod Rear Percent

[DaveBauerSS6]

If I go up to 58% rear I would be about 150 lbs over the minimum weight or is rear percent more important than overall weight?

If you think you have enough motor to carry it and the weight is in between the axles, Ya.

[stock car driver]

Leaf springs lose arch from the time they are put in. Rate stays the same.
Loss of arch decreases thrust angle, thus a loss of forward bite.

Sorry, when I raced a nova I built a rater and used scales to test them..

the final straw for me was when my lr lost 70lbs of rate in one night on a heavy track

[dirtrace09]

Can you run composite leaf springs in IMCA? I am not sure of the rules. If so, run them with a panhard bar and they work great. I ran them on a ump modified before.

[DaveBauerSS6]

No composites allowed in IMCA.

[Krooser]

Leafs still seem to work fine on heavy or rough tracks. I'd build a bracket to hold up the rear frame of your race car while hauling it to the track… and keep the weight off of the springs until you are ready to race.

I ran with a lot of leaf cars in the past that would beat down most any three link… I have a leaf super stock right now that will be next winters project car.

[dereksehi]

Has anybody ever tried a half leaf rear suspension. Kinda like a 3 link but use the front part of the leaf as the lower trailing arms and cutting the rear half off and using a coil spring on top of the rearend on each side. Then putting the solid pullbar on top of the rearend with a panhard bar behind the rear. I believe it would pass tech as long as all of the rearend links are within the specified length. How well would a setup like this work?

[stock car driver]

rules are on imca.com

you can only have one spring per corner

[dereksehi]

It would only be one spring per corner since the leaf wouldn't go all the way to the back it wont support any weight it would function as a trailing arm not a springing mechanism.

[stock car driver]

No it wouldn't that would still count as a spring, lol.

[dereksehi]

If it would be considered a spring what would its rate be since its a flat piece of steel if there isn't any rate then its not a spring

[stock car driver]

If it would be considered a spring what would its rate be since its a flat piece of steel if there isn't any rate then its not a spring

Rules are rules a spring cut in half is still a spring.

Im not going to argue Ive done nothing but try and help you which seems to be futile.

good luck

[modified9]

half leaf

Rules are rules a spring cut in half is still a spring.

Im not going to argue Ive done nothing but try and help you which seems to be futile.

good luck

back in late 80s early 90s there were several cars that had half leaf with a coil how do u run a monoleaf car 2leafs 2 coil springs