Driving Impressions: Lower Stress Bar

[insite]

bottom line: this thing was like $130 shipped. it really works! between my last track day and this one, i did the following:

996 front brakes w/ racing pads
mantis lower stress bar
bilstein sport front dampers

lap times went from 1:15:20 to 1:12:72. that's 2.5 seconds on a 1.41 mile course! i'll take it.

[chaudanova]

wow, thanks for posting this up, that's awesome to hear. Do you know what G's you were pulling prior to the addition of the bar? And also, do you notice any difference on street driving?

[insite]

Originally Posted by chaudanova

wow, thanks for posting this up, that's awesome to hear. Do you know what G's you were pulling prior to the addition of the bar? And also, do you notice any difference on street driving?

on this course, i averaged 1.06G with a max of 1.13G. this thing put me in the stratosphere here. it really holds the camber. as for street driving, it doesn't effect comfort levels at all. i don't really notice it under normal driving circumstances. it's very noticable when i push it.

[BobMarley1]

how do I order one?

[MNBoxster]

Hi,

How are you measuring your lateral acceleration? You're throwing around numbers here (both Baseline and Modified) which are greater than those repeatedly published for the Boxster S (0.91g).

While that may be so of a Modified Car, I doubt it's the case with a Base Boxster. I suspect your Data Logger is miscalibrated. How else do you explain it?

Happy Motoring!... Jim'99

[insite]

Originally Posted by MNBoxster

How are you measuring your lateral acceleration? You're throwing around numbers here (both Baseline and Modified) which are greater than those repeatedly published for the Boxster S (0.91g).

While that may be so of a Modified Car, I doubt it's the case with a Base Boxster. I suspect your Data Logger is miscalibrated. How else do you explain it?

logger is not miscalibrated. it's a racepak gps; the accelerometers and GPS calcualted lat G's are the same. it's easy to explain:

1. modified car
2. turns 1 and 2 are slightly banked
3. alignment of a stock boxster s sucks, not enough camber

[insite]

Originally Posted by BobMarley1

how do I order one?

their website is here: http://www.mantissport.ca/

you can't order online, though. call them at 905.844.6219 and ask for stan. btw, any prices listed on their site are canadian.

[insite]

for those interested, here is a graph of my fastest lap showing lateral acceleration derived two different ways:

1. on board accelerometers (red line)
2. calculated from GPS polling data (green line)

the RacePak polls gps several times a second. there is some latency and interpolation. this is why the green line lags the red line by a little bit. magnitude, though, is very comparable between the two. the data is accurate.

[racer_d]

Interesting discovery. Reminds me of the problems I had with my 914 experiencing trailing arm flex under high g loading (expecially with wide sticky tires, compared to the then stock, skinny, non grippy ones )

I'll have to keep this mod in mind. Wonder how SCCA/PCA allows it for, say, Autocrossing?

[steve00s]

I have finally gotten around to installing the lower braces on my car and have a question for those of you who have done this.

I can't get the old bolts out. I understand that they are pressed in and should pop out but I have whacked on them pretty good without any movement and am afraid of breaking or bending something. What is the trick to getting these out?
Thanks.

[blue2000s]

Originally Posted by steve00s

I have finally gotten around to installing the lower braces on my car and have a question for those of you who have done this.

I can't get the old bolts out. I understand that they are pressed in and should pop out but I have whacked on them pretty good without any movement and am afraid of breaking or bending something. What is the trick to getting these out?
Thanks.

I put a nut on the end of the captive stud and hammered away. It gives you a bigger target and keeps the end of the stud from getting deformed. The colder the parts, the more easily it will push out. It feels like it's never going to back out and then all of a sudden it lets go.

[blinkwatt]

Does the company that you bought the stress bar from have a website?

*Never mind I found it;
http://www.mantissport.ca/
I can't seem to find the lower stress bar though.