Scale vs smasher

[ZERO25]

We were told by our last car owner to put 60 lbs more load on the rr. What will that look like on scales?

[billetbirdcage]

We were told by our last car owner to put 60 lbs more load on the rr. What will that look like on scales?

Depends on the motion ratio of the RR suspension. Could be about anything scale number wise depending on car and what you have on there.

Easiest way to do what he says is (assuming he was talking ride and dynamic load - just a 60# increase everywhere) is to just divide the spring to the measurement and compress the spring that much more at ride height.

Example 225# RR spring. 60# / 225 spring = .26"

Spring is compressed to 10.625" at ride height so add rounds until that measurement becomes .26 less at 10.365"

PS 60# isn't much of a change, IMO

[Jking24]

I agree with billet i have had drivers tell me they can feel 25-30# in the rr but just because they could tell their was a change doesn't necessarily mean their was any significant change on the stopwatch. When we want to want to get a definitive change from a car we typically change 100-150# on the rr

[CCHIEF]

May I ask what he is trying to accomplish? I see ~25#/turn on @ ride height on MY 225 spring, no rubbers and Integra Shock threads..FWIW

[ZERO25]

In my prior days before smashers, 110-150 lbs of lr bite was common. Whats a ballpark for todays setups?

[CCHIEF]

What car/engine....and (springs just curious). I can only provide #'s for Rocket Blue front car.

[MasterSbilt_Racer]

In my prior days before smashers, 110-150 lbs of lr bite was common. Whats a ballpark for todays setups?

I think it varies a lot by mfg. I've seen anything from 180# LR to 40# rr

[7uptruckracer]

Use builders baseline. They can’t make a setup baseline for each car and set of rules etc. After that once your care is decent you can take advantage of all your rules and fudge ride heights etc once you roll it back on scales after you smash springs and make changes you can end up way different then baseline statically but your dynamic can be virtually the same as your baseline but you will be taking advantage of a lot of other things.

[MasterSbilt_Racer]

I'm going to play devil's advocate here. Which dynamic? We typically pick a point or two. There are a whole bunch of them in between. Some will be the same, some won't.

[Punisher88]

I'm going to play devil's advocate here. Which dynamic? We typically pick a point or two. There are a whole bunch of them in between. Some will be the same, some won't.

Exactly. A 225 rf spring at 2000 @4" has a hell of alot different graph than any stack that ends at 2000

[CCHIEF]

Dynamically...Toss in a bump spring, spring rubber/s or stop to muddy the water....and amount of rebound in shock where it has you hovering dynamically and spring pushing back depending on quantity and quality of them, available surface traction......clear as mud! Take good notes and data!---------------- To original post... simply.... more RR load, less LR bite from where you were on scales, but more than that going on.

[crownman25]

You guys not scaling your car and checking your static weight on your rear wheels let me know how that 100 rr heavy works in the slick..

[dirtdobberrr]

100rr heavy in the slick will most likely end up in the inner wall or infield frequently.

[ZERO25]

You guys not scaling your car and checking your static weight on your rear wheels let me know how that 100 rr heavy works in the slick..

Ummmmm, the guy we bought the car from runs 60, and he's a regional terror!

[Jking24]

You guys not scaling your car and checking your static weight on your rear wheels let me know how that 100 rr heavy works in the slick..

You clearly don't understand how any of this works. And no body here said anything about being 100# heavier on the rr statically. The op asked about adding 60# he did not state what he was starting from he just asked what the effects of the change would be