Rear Lower Stress Bar Feeler

[mgfranz]

Originally Posted by hockenheim

I don't understand how this bar or at the Pedro bar improves stiffness. Aren't the two sides already prevented from moving through the aluminum undertray?

While the aluminum undertray is there to do just that, it has a tendency to flex under strong loads, even bend. This bar alleviates that possibility.

[Robert986]

Originally Posted by mgfranz

While the aluminum undertray is there to do just that, it has a tendency to flex under strong loads, even bend. This bar alleviates that possibility.

Is this "confirmed"? Do we know that it flexes and do we know that there is a real gain by using the stress bar? Comparing with a front strut brace which I believe is considered redundant..

EDIT: Not trying to sound negative, I want to believe... ;-)

[mgfranz]

Originally Posted by Robert986

Is this "confirmed"? Do we know that it flexes and do we know that there is a real gain by using the stress bar? Comparing with a front strut brace which I believe is considered redundant..

EDIT: Not trying to sound negative, I want to believe... ;-)

Which front brace are you referring to?

[rfuerst911sc]

MG do you think the aluminum plate will have to have the mounting holes slotted or " opened up " to allow suspension adjustment ? Or do you think there is enough " slop " in the holes from the factory ? You will know more once you get alignment rack results just curious on your thoughts and what you have seen on your own car .

[mgfranz]

Originally Posted by rfuerst911sc

MG do you think the aluminum plate will have to have the mounting holes slotted or " opened up " to allow suspension adjustment ? Or do you think there is enough " slop " in the holes from the factory ? You will know more once you get alignment rack results just curious on your thoughts and what you have seen on your own car .

I would think that they would need to be elongated some, but let me get on the rack to verify.

[Topless]

Originally Posted by Robert986

Is this "confirmed"? Do we know that it flexes and do we know that there is a real gain by using the stress bar? Comparing with a front strut brace which I believe is considered redundant..

EDIT: Not trying to sound negative, I want to believe... ;-)

I can offer my own experience with a strut brace mounted on my 986 for 6 years and 80 track days. I did notice a very subtle improvement in chassis stiffness with fewer creaks going over a swale or up my steep curved driveway. It was subjectively a small improvement, not a big improvement but it didn't cost much so...

Did it measurably improve my lap times? No.

Re: a comparison with a front strut brace? A 986 has a very stiff front chassis similar to a 996 GT3 Cup. No front brace is needed there.

Does it work better on an "S" model than a 2.5L? Lateral G forces are the same on both cars in a corner so there would be no difference. Lateral Gs are mostly a result of tire choice and your suspension's ability to control your contact patch.

[mgfranz]

Originally Posted by Topless

Did it measurably improve my lap times? No.

I expect this to be more of a "feel" than actually improving lap times, the way I look at it I would expect a firmer plant and an improved stiffness over stock. Time will tell.

[edc]

Originally Posted by mgfranz

I expect this to be more of a "feel" than actually improving lap times, the way I look at it I would expect a firmer plant and an improved stiffness over stock. Time will tell.

You get this with the plain bar. Don't get me wrong I like the thought and spec in the product but not sure there is any real benefit in it over and above a plain version.

[mgfranz]

Originally Posted by edc

You get this with the plain bar. Don't get me wrong I like the thought and spec in the product but not sure there is any real benefit in it over and above a plain version.

While this might be true, remember I built this bar for the potential of adjustability at the track, (which could be beneficial on the street as well). I have an appointment at my local spec shop on Friday so I should have numbers soon.