General Motors V8 Discussion Discussion relating to getting the most out of your LSx or other GM-based V8 Miata's engine

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Old 04-07-2010, 01:50 PM
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Originally Posted by chpmnsws6
Do they make a rear shock tower brace for the NA/NB?
Yep, had a Beatrush bar in my NA and it was compatible with NBs. I know there are a few other brands out there too.
Old 04-08-2010, 09:00 PM
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Mine are bent much worse than that. If you take your thumb and press on them as hard as you can you can dent them with your thumb. They are much thinner than body panels.
Old 04-09-2010, 11:08 AM
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What's the point of the rails then, if they are so thin?
Old 04-09-2010, 11:28 AM
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Originally Posted by skidude
What's the point of the rails then, if they are so thin?
Kinda what I was thinkin...
Old 04-09-2010, 11:39 AM
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They still offer some strength to the car, at least before they were crushed.
Old 04-09-2010, 12:26 PM
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So then you don't want a car with crushed rails if you need it as stiff as possible, right?
Old 04-09-2010, 07:24 PM
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Perhaps, perhaps not, seems to be several different opinions on it.
I believe the V8 kits come with a bolt in "frame connector" or chassis stiffener that would mitigate any concerns with the factory rail.
But for me, I plan on getting a prestine body, I have the time and wear with all to get it. It may not make a difference in the end product, but it will to me.
Seeing I'm investing quite a bit of time and money into this endevour why would I settle for anything less if I don't have to?
Old 04-09-2010, 07:25 PM
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Originally Posted by skidude
So then you don't want a car with crushed rails if you need it as stiff as possible, right?
Wrong, crushed or intact the stock rails don't do jack. If you want an NA car to be stiff you:

a. Install aftermarket frame rails & bracing (FM or similar for 4 banger cars, V8 Roadsters or similar for V8 conversions
b. Install a roll bar
c. Install door bars that go with the roll bar
d. Install a front shock tower brace
e. Install Boss Frog style front end braces (underneath front fenders)

Last edited by sn95; 04-09-2010 at 07:58 PM. Reason: Deleted rear shock tower brace from list
Old 04-09-2010, 07:40 PM
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Originally Posted by sn95
If you want an NA car to be stiff you:

d. Install front & rear shock tower braces
Your results may vary, but after installing a proper rollbar I noticed no difference in handling when I removed my rear shock tower brace, or after I reinstalled it. It made a noticeable difference before the rollbar was in the car though.
Old 04-09-2010, 07:57 PM
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Originally Posted by RotorNutFD3S
Your results may vary, but after installing a proper rollbar I noticed no difference in handling when I removed my rear shock tower brace, or after I reinstalled it. It made a noticeable difference before the rollbar was in the car though.
Thanks for that insight. I can see how the rear shock tower brace wouldn't add much; my Hard Dog roll bar rear attach points are fairly close to the tops of the rear shock mounts. I guess that's one stiffening device I can take off my list!
Old 04-09-2010, 10:54 PM
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Originally Posted by skidude
So then you don't want a car with crushed rails if you need it as stiff as possible, right?
If you want to make a mountain out of a mole hill
Old 04-19-2010, 12:50 AM
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Yes you absolutely Right dear.
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