Rocket bolt in inderslung

[rakracing]

thanks rocket1 ,was what I was looking for. mastersbuilt and brian ive had the same issue with the oscillation at times specially on ruff tracks but it still seemed to not beat up the lr. like everything theirs good and bad with both, i'm big on experimenting, was messing with daul stage spring setups five years ago also.

[Racerguy27]

Rocket1
I asked Mark Richards about removing the right under slung. He told me that the car will turn in better if you leave it out.

Are you saying to remove the right under slung bar completely? If so how does that make it turn in better?

[RacerX10]

Rocket1
I asked Mark Richards about removing the right under slung. He told me that the car will turn in better if you leave it out.

Are you saying to remove the right under slung bar completely? If so how does that make it turn in better?

I'll take a stab at it ...

Maybe it flexes the car like a sidecut snow ski ? They turn much better than the old style straight stuff

[Matt49]

Rocket1
I asked Mark Richards about removing the right under slung. He told me that the car will turn in better if you leave it out.

Are you saying to remove the right under slung bar completely? If so how does that make it turn in better?

I'll also take a stab at it...
Removing the under slung effectively allows the upper frame rail to flex more which would decrease spring rate felt at the wheel (wheel rate). Reducing wheel rate at the RR looses entry (helps it turn in).

[Nobody]

I'll also take a stab at it...
Removing the under slung effectively allows the upper frame rail to flex more which would decrease spring rate felt at the wheel (wheel rate). Reducing wheel rate at the RR looses entry (helps it turn in).

ding ding, we have a winner

[hpmaster]

Thought we had springs and shocks controling wheel rates not how much a chassis bends and returns to it's original position. So after how many flex cycles does this flexable flyer need an under slung bolted on to control the changing properties of the chassis if this is true?

[Matt49]

First of all, it is true. Not really any ifs about it. Every chassis is designed to flex. Even pavement cars. How much flex determines how much of a sweet spot you have for overall grip.
Too little flex and the car will be too sensitive to bolt-on suspension changes and you'll never find that sweet spot.
Too much flex and the car won't respond to bolt-on suspension changes because the chassis is taking the loads.
So the answer to your question is, like with most things, it depends. If your car stops responding to changes you are making on the right rear corner, put the bolt in under-slung in and see how it works. It will certainly change how that corner responds to load.

[hpmaster]

Like the floating X GRT car and the MB "pull the link on dry slick car", I understand what you are saying but it equals undampened spring of unknown rate in my book.

[Matt49]

Like the floating X GRT car and the MB "pull the link on dry slick car", I understand what you are saying but it equals undampened spring of unknown rate in my book.

You're probably right but we're probably talking about very high spring rate with very low speed movements. So in theory, this wouldn't require much dampening to control from an oscillation standpoint. But I'm also not endorsing this as a tuning tool.
With that being said, I saw some long-haired dude from California (Bloom-something-or-another) take a sawzall to his race car after a heat race back in the 90s and he won the feature that night :-)

[MasterSbilt_Racer]

You're probably right but we're probably talking about very high spring rate with very low speed movements. So in theory, this wouldn't require much dampening to control from an oscillation standpoint. But I'm also not endorsing this as a tuning tool.
With that being said, I saw some long-haired dude from California (Bloom-something-or-another) take a sawzall to his race car after a heat race back in the 90s and he won the feature that night :-)

I have had my rear handed to me by sawzall cars. There are a lot of cars out there right now winning races with slip joints, too.

[hpmaster]

I have had my rear handed to me by sawzall cars. There are a lot of cars out there right now winning races with slip joints, too.

I have seen this used on several car also, one car currently has it is on the tube coming down from the halo on the left frt corner of the cage. Then again there are currently built winning cars that use .120 wall thickness tubing in certain places for both safety and rigidity. Your way my way and the right way I guess.

[MasterSbilt_Racer]

I have seen this used on several car also, one car currently has it is on the tube coming down from the halo on the left frt corner of the cage. Then again there are currently built winning cars that use .120 wall thickness tubing in certain places for both safety and rigidity. Your way my way and the right way I guess.

Not saying I agree. Heck, I prefer my MasterS cars with 2X2 rails.

[rocket1*]

After looking at the Rocket house car last summer I noticed it had no right underslung. And that's when Mark told me they didn't run one to help the car turn in better. He never really explained why. we ran without it after that and can't say I really noticed a difference.