soft RF why and what.

[MasterSbilt_Racer]

One year? Sorry try again. 98,99,00,01,02.

Fwds were just easy money around here in 05,06,07,08 to the tune of 36-47k dollars of sales building them per year...

The class of car is irrelevant to this thread though anyways.

I could say youve raced a total of what 15 times in 10 years and you think your relevant to post anything on a racing forum, lol, but I wont, you already know your irrelevant thats why all the jealousy. Heck I could even say something about having 3 drivers in the top 20 in IMCA national pts running my rearends, over 40 feature wins between 6 cars with jnj rearends. And of course the Nascar national championship a driver with my rearend won this year in tier 3 or 4.. but again Ill let it go, your already jealous no sense fueling the fire.

The class may be of no consequence, but the rear suspension type does matter.

[MasterSbilt_Racer]

I have ran a softer rf spring since 1998. That would be with many different suspension types and classes of cars, lol.

leaf, coil, 4 link, 3 link j bar, 3 link panh behind.

The same principles seem to apply to ALL oval track cars.

powerslide, I never said I ran a dirt late model, neither did the starter of this thread. Look around there are lots of general questions like this in every catagory.

The facts are you cant contribute any more than what youve read from other people. You havent raced and tried stuff, your still struggling to get sponsors so you can race two nights a season according to your plea on fb.

My website hasnt had a update since 2009 or so, the fwd class around here ran its course I just do a few cages in them now per season. Maybe someday youll have the skills to quit your day job and make a living in your shop behind your house!

A 500/450 setup is a bit different than say a 550/250. You would be hard pressed to run the latter on a monoleaf and lift arm car.

I had a lot of success with a metric street stock with a 1400/1000 setup in 1996, but that is apples to oranges.

[Egoracing]

A 500/450 setup is a bit different than say a 550/250. You would be hard pressed to run the latter on a monoleaf and lift arm car.

I had a lot of success with a metric street stock with a 1400/1000 setup in 1996, but that is apples to oranges.

One thing that is being missed it the weights location as the chassis rolls onto the RF and the condition of the LR suspension while the RF is compressed. This is where the dirt late model or modified differ than other suspension setups. If the setup actually puts less weight on the RF how can you go from a 400RF with 2 -3 inches of travel to a 275RF and get 5 inches of travel? 2-3 on a 400 is 800-1200 lbs and 5 on a 275 is 1375. When the RF compresses the LR extends and it gets the bars into position before the application of the throttle. The body roll also raises the weight center line of the chassis which allows it to roll more weight over to the right. The Softer RF also compresses more and allows body roll without picking the LF tire off of the track.

[sj valley dave]

Just an observation...I do know that when we ran our DLM on pavement, a soft RF was the last thing the car needed or wanted. The more we ran a conventional asphalt setup with a stiff RF and kept the car flat as possible and chained down the LR to keep rear steer out of it, the quicker the lap times got according to the transponder...1/3 mile medium banked pavement track...

[4bangerhotrod]

if you have a 400lb spring thats only getting 2-3in of travel and are getting 5in travel with the softer spring then the stiffer spring is to stiff and thats the reason your swiching to a softer spring. the idea is to keep the max amount of rf travel from hot laps to feature thats the reason you have to soften as the track slicks off and slow's down. with the shocks we have now most of this is done with them, start out on the soft spring and just control it all with comp and reb as the track slicks off keep your rf travel and control when it gets there and when and if it comes off the rf.

[Egoracing]

The point was that the softer spring is getting more weight to transfer onto the rf than a stiffer spring.

[4bangerhotrod]

the force on the rf tire is less with a softer spring than it is with a stiffer spring at the same amount of travel.

[Egoracing]

the force on the rf tire is less with a softer spring than it is with a stiffer spring at the same amount of travel.

With the same travel the load would be less, that is correct as 4 inches on a 400lb spring is 1600lbs and 4 inches on a 250 is 1000lbs, BUT the travel is not and will not be equal, you will get more travel with the softer RF and that can easily equal more weight. There is not a setup in the world that will compress a 400 lb spring X amount and then you put a 250 on it and it still compresses it X amount. You will gain travel which puts the springs contact point on the chassis lower on the weight center line which will increase the load that the spring sees. It is basic physics on how the chassis works with the springs. The lower the top of the spring to the weight center line, the more the same weight will effect the spring.

[4bangerhotrod]

stockcar i wasnt asking i was seeing what everyones thoughts were on this, to see if it wouldnt spark a new idea.
ego, a car dont need a soft spring when the track is heavy so with a stiff spring on a heavy faster track your goal should be to get all the travel out of your rf that you can. as the track slows down the the car needs a softer spring to get the same amount of travel. on the same track conditions a stiffer spring wont have as much travel as a softer spring. the cars not turning better because of the rf its turning better because of the rr mostly

[4bangerhotrod]

i was looking for something to spark a new idea but evidently ive come to the wrong place. you need to know why it works and how it works before you can make it work. i quess thats why you run steet stocks and we contend for national championships. we dont change springs anymore, we run a a stack rf, it works and has won alot of big races this yr i just dont enjoy setting shocks with laptops, and using computers at the track. it looks like it will be this way for the next few yrs but i know guys who's having alot of success running a conventional rf spring setup we just never was able to get it figured out like them.

[Egoracing]

stockcar i wasnt asking i was seeing what everyones thoughts were on this, to see if it wouldnt spark a new idea.
ego, a car dont need a soft spring when the track is heavy so with a stiff spring on a heavy faster track your goal should be to get all the travel out of your rf that you can. as the track slows down the the car needs a softer spring to get the same amount of travel. on the same track conditions a stiffer spring wont have as much travel as a softer spring. the cars not turning better because of the rf its turning better because of the rr mostly

I can not remember when I have ever seen any top racer change out springs at the track. If you ever watch the top guys they unload and run the event unless they are WAY OFF. Randy Weaver told me straight out that he does not touch the springs on the car unless he is out in left field and he typically does not even touch the bars.

[4bangerhotrod]

we dont change springs anymore but we used to, but yes alot of top drivers change springs at the track they do it in the hauler so you just dont notice. we usually dont change anything at the track now days cause everything is controlled by these high dollar shocks. im not the driver i just do setups i figured out i couldnt drive along time ago.

[sj valley dave]

I know we changed springs when we went to a pavement track...LOL

[grt74]

Im getting a kick out of this,just simple physics

[Egoracing]

we dont change springs anymore but we used to, but yes alot of top drivers change springs at the track they do it in the hauler so you just dont notice. we usually dont change anything at the track now days cause everything is controlled by these high dollar shocks. im not the driver i just do setups i figured out i couldnt drive along time ago.

I do not car where they do the actual change you would still see them take the shock off and carry it into and out of the trailer. It does not happen that much at all.