Subframe Connectors Needed? 11+

[908ssp]

Of course. I have a half-cage. The point is that SFC's will help reduce torque deflection on the chassis. It's kind of obvious.

It is not obvious at all. From an engineering point of view the placement and connection of "subframe" connector will do little but add weight.

 

[lost won]

Torsional Rigidity in 2011+ Mustangs

Have to agree with Vince. Here's my autocrossing 2012 Brembo pkg GT, pure stock with just Hoosiers, LF in the air...

It seems to work quite well stock, even with the extra traction of Hoosier A6s. I was surprised at

how well the suspension handled the 295/30-19s on stock Brembo package 19x9 wheels.

I didn't see the latest Mustang models on the list. Wonder where they fit.

 

[Sky Render]

I didn't see the latest Mustang models on the list. Wonder where they fit.

The S197 chassis is essentially the same from '05 to present, so the torsional rigidity is going to be about the same.

Obviously a convertible is significantly less rigid, however.

 

[cudaman]

Even though many people say you don't need SFC's you have to look at the bigger picture.
People who only street drive, or drag probably don't need them.

But people like me, who race, feel how the frame and "unibody" twists and torques around a track. This twisting causes shifting issues with the stock semi-remote shifter because of its body mounted bracket. When the body twists (and it does) it throws the shifter out of alignment with the transmission enough to cause lockout or mis-shifts at high speeds, especially during cornering.

So if you are doing road race or autocross SFC's are a must, despite what you might hear otherwise. The S197 is not that stiff compare to race-bred cars, but compared to old Fox's it is stiffer....still not great though.

I agree. I put the Stiffler-M3 model weld-in frame brace on my ride and it helped with weight transfer on corners. Helps keep the non-load bearing wheel on the ground better. Also put in the CHE-K member with the torque braces to help hold the engine/tranny together on fast acceleration/corners. Shifts great with stock shifter. Never miss a shift.

 

[Whiskey11]

Really? Because the S197 chassis is stiffer than quite a few other cars out there, including the McLaren F1. So your comment that the S197 is "still not great" is complete bullshit.

I autocross and race the shit out of my car and don't have subframe connectors.

EDIT: Here's the list:
http://www.germancarforum.com/community/threads/the-list-torsional-rigidity.12334/

S197 is 21,000 Nm
Mclaren F1 is 13,500.

Sent from my toilet using Tapatalk

According to that same list a 2003 SN95 is stiffer than the F1 is. That either means the Mclaren is shit and the SN95 isn't as bad as we thought, or the numbers are wrong because we all know how big of a difference SFC's make on previous chassis cars.

Your mileage may vary. If nothing else it may be a class legal jacking rail which could come in handy when working on the car.

 

[BMR Tech]

If nothing else it may be a class legal jacking rail which could come in handy when working on the car.

This is the primary reasoning behind why most of my customers (handling oriented) run our SFC011 Subframe Connectors.

 

[Drkmrkiv]

I would assume front strut bar, k-member brace and rear strut bar would be more noticeable than SFC's. that's just logic I've gleaned from personal experiences.

 

[NotQuik]

Even though many people say you don't need SFC's you have to look at the bigger picture.
People who only street drive, or drag probably don't need them.

But people like me, who race, feel how the frame and "unibody" twists and torques around a track. This twisting causes shifting issues with the stock semi-remote shifter because of its body mounted bracket. When the body twists (and it does) it throws the shifter out of alignment with the transmission enough to cause lockout or mis-shifts at high speeds, especially during cornering.

So if you are doing road race or autocross SFC's are a must, despite what you might hear otherwise. The S197 is not that stiff compare to race-bred cars, but compared to old Fox's it is stiffer....still not great though.

The shifting issue is actually quite opposite...the engine obviously torques to the side when in its "power band" being it is supported by rubber motor mounts and trans mount, the body doesn't move which causes it to bind. If you don't believe me, go rev your engine and watch what it does...then use your imagination and imagine how much it flexs under a load. If you've ever been in an older mustangs or fbody and watched the shifter move when rowing the gears...this is the same principal.

Many people either get torque limiters or poly motor mounts to help with this issue. It's not uncommon as I'm sure you know...so people who drag race are most likely affected more for obvious reasons due to added traction.