If you really want to stiffen up the car, look at the Flying Miata butterfly brace for inspiration.
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e30 Cabrio Chasis Stiffening
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Originally posted by jeffnhiscars View PostWe are each just sharing our own experience and what we learned from it. To me THATs what it's all about. Saying everyone is wrong but you....well...kinda ends the conversation....if we let it...but don't we cause it's too much fun :)
you haven't told us anything about YOUR vert build, so i'm guessing one hasn't happened.past:
1989 325is (learner shitbox)
1986 325e (turbo dorito)
1991 318ic (5-lug ITB)
1985 323i baur
current:
1995 M3 (suspension, 17x9/255-40, borla)
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Have the garagistic xbrace on my vert and it's been one of the best upgrades I've done.Last edited by allen_t; 08-14-2016, 09:46 PM.http://www.DeluxeCarStorage.com
87 325ic - Early ACS Tribute
90 325i MT2 - R.I.P
Seller Feedback: http://www.r3vlimited.com/board/showthread.php?t=380908
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Originally posted by allen_t View PostHave the garagistic xbrace on my vert and it's been one of the best upgrades I've done.1987 325i Convertible
2015 Fiesta SFE: 1.0L of 'Woah, is that torque under 2k?'
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Originally posted by decay View Postconversation really isn't going to continue a lot further when you say your opinion > my direct experience anyway, so go ahead and continue being wrong :)
you haven't told us anything about YOUR vert build, so i'm guessing one hasn't happened.
Having said that, I stand firm in my "opinion" that a piece of frp anchored at 4 points and with zero torsional reinforcement whatsoever will add anything noticeable (let alone anything measurable) to the stiffness of a Cabrio...beyond the placebo effect...in my opinion....which is based on my experience.:p
I'm good to agree to disagree. Seems you aren't...cause we are all wrong..except for one of usLast edited by jeffnhiscars; 08-15-2016, 05:28 PM.Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
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I disagree to agree. Hard top makes a big difference. Jeff, I feel like you are usually reasonable about stuff like this. Why so stubborn this time?Originally posted by Andy.BWhenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
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Ahh, maybe I'm being stubborn. Anyway, it don't matter, it's just the Internet...Originally posted by Andy.BWhenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
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Originally posted by Ether-D View PostI disagree to agree. Hard top makes a big difference. Jeff, I feel like you are usually reasonable about stuff like this. Why so stubborn this time?
I'd like to stiffen up my car while keeping it open on top.1987 325i Convertible
2015 Fiesta SFE: 1.0L of 'Woah, is that torque under 2k?'
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Originally posted by validius View PostBecause a convertible with a hard top is just a worse coupe?
In the summer a convertible with a hardtop is a worse coupe.
In the winter a convertible with a hardtop is a better convertible.Originally posted by Andy.BWhenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
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Originally posted by Ether-D View PostI disagree to agree. Hard top makes a big difference. Jeff, I feel like you are usually reasonable about stuff like this. Why so stubborn this time?
Trying to be as scientific as possible, I just don't see how a thin sheet of un reinforced frp will offset the twisting of a 3000lb flounder traveling at high speed and the stiffer that flounder gets, the less potential there is for that flimsy sheet of fiberglass to make a difference.
Think of it like this....the cars torques from all 4 corners and the mounting points of the roof are within that rectangle only much smaller. That means the leverage effect of the car twisting the roof has to overwhelm the roofs ability to "torque back" (yes I made that up) aka resist chassis flex.
To me it's physics. The roof is competely submissive to the chassis and has a very marginal ability to fight back given the forces involved....in my opinion :)
What if I'm right and ALL of YOU are wrong ;D
Any engineers or physicists out there ?Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
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Originally posted by jeffnhiscars View PostAny engineers or physicists out there ?
A small amount of strength in that shell shape across the mounting points that the hard top attaches to could make allot of difference. Fiberglass is deceptively strong in tension. It is absolutely plausible that there could be a real benefit to a hard top but without data i cant say.1987 325i Convertible
2015 Fiesta SFE: 1.0L of 'Woah, is that torque under 2k?'
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Originally posted by Ether-D View PostI would state it this way:
In the summer a convertible with a hardtop is a worse coupe.
In the winter a convertible with a hardtop is a better convertible.
Even if the jury is out on adding any stiffening.
Personally I see both stances on the subject but I think it would add a little bit of stiffness. Not a lot but again no 1st hand experience.
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Originally posted by validius View PostYes, i'm an ME. I don't have anywhere near enough data to come to any conclusion about the hard top except it almost certainly wont make the car worse.
A small amount of strength in that shell shape across the mounting points that the hard top attaches to could make allot of difference. Fiberglass is deceptively strong in tension. It is absolutely plausible that there could be a real benefit to a hard top but without data i cant say.
Aren't we talking torsion not tension ?Last edited by jeffnhiscars; 08-16-2016, 09:16 AM.Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com
https://www.r3vlimited.com/board/sho...86#post4944786
Alice the Time Capsule
http://www.r3vlimited.com/board/showthread.php?t=360504
87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220
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I feel like we're talking torsion, tension, and compression. To me it's like a 2"x4"x12" cardboard box versus a 4"x4"x12" cardboard box. One is certainly easier to twist and bend.Originally posted by Andy.BWhenever I am about to make a particularly questionable decision regarding a worryingly cheap diy solution, I just ask myself, "What would Ether-D do?"
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