bump springs

[fastford]

it is to me to krom , thats why when I start working with a bump or 2 stage rt frt , I dont want anything limiting the left rear , some time spent working here will gain speed through the turns , still cant let shock bottom out though ,

[Kromulous]

An interesting trend i see now is putting a jack bolt (adjustable upper mount) on the front shock mounts. I think i am going to cut on our Swartz chassis to add this to the RF, so i can play with this very thing. Should make it easy, altering the pin to pin at ride, of course you would add or subtract on the ride spring but that should be easy enough. If the thread count was the same, shock to jack bolt, that would be even nicer.

[fastford]

i have thought about this to , as well as on the left rear , the only thing is , your changing your static ride height , not that it matters as much now , where as shimming the bump does not change it , now on the left rear it might be good for lowering shock mount if more drop is needed to keep shock from bottoming out..

[grt74]

An interesting trend i see now is putting a jack bolt (adjustable upper mount) on the front shock mounts. I think i am going to cut on our Swartz chassis to add this to the RF, so i can play with this very thing. Should make it easy, altering the pin to pin at ride, of course you would add or subtract on the ride spring but that should be easy enough. If the thread count was the same, shock to jack bolt, that would be even nicer.

its been in asphalt for years

[Kromulous]

Fastford, keep in mind that if you lower the mount, say 1" and then raise the ride spring (shock body) 1" the net result is the same ride, but your 1" closer to the bump (@at ride). Plus the Mod guys have been using the jack bolts on the rear shocks for awhle, always thought about this.

I wish i had more free time, be fun just to make my own chassis. I have been working on one in NX on government time LOL, but a long way to go.

I seen them in the Asphalt cars, where i 1st seen the Allstar mount, Port City i think, great i dea i think.

[7uptruckracer]

With all of this you HAVE to keep spring preload in mind. We are getting ready to put a bump stick on mine that way you don’t have to worry about some of these issues. You can always ask your shock builder if you have room to cut down the shock body as well. You want the right static spring preload so you have the right dynamic spring load. You also want to take advantage of any aero rules for example raising RF pin height to drop LR deck height so you can builtit back up to tech. ALLL of this is why you started seeing shock strokes of “untraditional lengths”. All your numbers are based off max travel then your ideal max spring load know that number and work backwards. Don’t forever these days aero can mean more then mechanical load...we see that more and more with touring cars.

Fastford, keep in mind that if you lower the mount, say 1" and then raise the ride spring (shock body) 1" the net result is the same ride, but your 1" closer to the bump (@at ride). Plus the Mod guys have been using the jack bolts on the rear shocks for awhle, always thought about this.

I wish i had more free time, be fun just to make my own chassis. I have been working on one in NX on government time LOL, but a long way to go.

I seen them in the Asphalt cars, where i 1st seen the Allstar mount, Port City i think, great i dea i think.

[Kromulous]

I thought about the 6" body, is there any counter productive / adverse effects if you move the shock mounts (both) up vertically? Seems like there is plenty of room on the RF and LF under the hood, to bring the shock mounts up. I have thought about cutting the upper bar out and redesigning it it to more a hoop design, similar to off road cars and adding more travel.

Modifying the spring base, higher, would make the movement of the 2 points slower, but more travel. Although i think moving the shock mounts up say 3" wouldn't have that big of an effect, not sure thou.more stuff to research i guess.

[Jking24]

I thought about the 6" body, is there any counter productive / adverse effects if you move the shock mounts (both) up vertically? Seems like there is plenty of room on the RF and LF under the hood, to bring the shock mounts up. I have thought about cutting the upper bar out and redesigning it it to more a hoop design, similar to off road cars and adding more travel.Modifying the spring base, higher, would make the movement of the 2 points slower, but more travel. Although i think moving the shock mounts up say 3" wouldn't have that big of an effect, not sure thou.more stuff to research i guess.

Look at some pictures of the newer jimmy mars cars they are built like this

[JustAddDirt]

adjustable shock mounts

its been in asphalt for years

Donnie @ Lightning Chassis (UMP Dirt Modified) has been doing the adjustable jack bolts on
LR for 10 years. been using an adjustable RF mount on RF for 4-5 if you order car with one.

Works really well. just have to watch what size adjusting rod used, and make sure it is strong enough for the loading it will take.