Mastersbilt Gen X HELP!

[RaceEngineer]

The bump spring does get progressive as it starts to coil bind ..

I don't like binding springs. I believe linear for ride and progressive to stop. It's just my philosophy. I don't use the cone, tree, whatever you want to call it style bumps.

[Matt49]

On the Penske black, we definitely had issues with it packing down and eventually causing us bottoming issues at a high banked place. Going to the blue fixed that for the most part. We're likely going to get away from bump rubbers and do some more work on dual-stage springs (stacked). It seems like there is more margin for error there than the bump spring in terms of travel allowance before it starts getting progressive.

[SmithGT]

What's the best spring option on the RF of a GenX if you can't run bump stops or stacked springs?

[TheJet-09]

I've heard and believe a 350#, maybe 325# is a good starting spot. I was wondering though, with all the talk about the RF, is everybody on the same page as far as what lower shock mount they are using (there are two on a Gen-X RF lower)?

I learned that lesson when I first got mine, and there is a fairly significant difference in the motion ratio between the two.

[hucktyson]

The softest spring that prevents the car from slamming off the ground ... sometimes that might be a 375 other times it could be a 275 depends on the track and conditions. I believe driving style plays a roll also some styles generate more RF load than others

[RaceEngineer]

The softest spring that prevents the car from slamming off the ground ... sometimes that might be a 375 other times it could be a 275 depends on the track and conditions. I believe driving style plays a roll also some styles generate more RF load than others

Don't forget shocks. 100# @ 10 in/sec compression and you bottom out with a 650# RF spring.

[Matt49]

I've heard and believe a 350#, maybe 325# is a good starting spot. I was wondering though, with all the talk about the RF, is everybody on the same page as far as what lower shock mount they are using (there are two on a Gen-X RF lower)?

I learned that lesson when I first got mine, and there is a fairly significant difference in the motion ratio between the two.

Inside hole. Moving to the outside hole stiffens the RF significantly.

[RaceEngineer]

I always use the outside because it is similar to the smack location.

[hucktyson]

Have you done anything to stiffen your gen x ? I plan to start working on mine in a few weeks. I just have to decide if I’m going to buy a crate or not before I decide what to do to it ...

[RaceEngineer]

Stiffened the front. Not the rear. I think doing the rear isn't a bad idea.

[smartguy13]

I’ve always wondered what a digressive setup would do on the RF...The “preload” would get you to just touching the bump stop, and then the rate spring rate drops dramatically and now most all the rebound has to fight against is a piece of rubber. Not sure it would work, but something I’ve always wondered about.

[MBR Performance]

Where are most guys running there RF? Inboard or outboard on the lower?

[hucktyson]

The further from the ball joint you move the lower shock mount the more likely you are to bend the control arm when you bottom out. If I wanted a softer spring and shock I would make those adjustments instead of moving it in ... that’s probably because I’ve bowed a lot of lower a arms running a bump stop or a non barrel spring ....

[Matt49]

Where are most guys running there RF? Inboard or outboard on the lower?

Most in this area (southern Indiana - MasterSbilt's back yard) are using the inboard hole.

[Basecircle]

I don’t have any experience with a MB chassis specifically, but generally it depends on the Track, driver, etc. There’s no right answer for what’s “better” or they would quit giving the option. You can usually guess with the style of track, driving style, power levels, etc. which will be best, but I’ve seen the opposite of what SHOULD work be better too. It’s what makes these cars such a challenge.