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The GM designation for the 5.7 liter, (350 cubic inch), TPI motor. This motor was used in other GM vehicles, but was used in the Corvette from 1985 t...
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djxib Frame flex
Senior Guru
North Georgia
444 Posts
Member since:
2008/8/23 11:49



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OK - I want to do a cool suspension/frame project on this 96 Coupe. Seen a lot of different aftermarket parts - roof braces, x-braces, frame tensioner, sway bar updates, heim joint bushing upgrades etc.

Assuming that fabrication skills are readily available, and access to a lift and a shop, and willingness to strip the car down to access the frame.. what would you like to see as a project? Greenwood wrote an article that was critical of the C4 design and in their (rare) G-350 and G-383 builds they did some frame mods, would love to know what they did. Lots of debate on the viability of cross-bracing. Gordon Killibrew's frame flex solution seems kind of a band aid?

What do you guys think?



Posted on: 6/20 11:48
_________________
Andy

1996 Greenwood Collectors Edition LT4

Previously 1992 Convertible Polo Green. 383 LT1/LT4 forged/balanced. V7-YSi, Alky. 608RWHP... Now sitting at a dismantler with a salvage title. Still runs...
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bogus Re: Frame flex
Grand Imperial Pooh-Bah
San Pedro, CA
20608 Posts
Member since:
2005/9/7 0:00



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Well... the frame design is a killer weakness. Have you read Dave McClellan's book, Corvette from the Inside? He lays out why the C4 frame sucks.

If you can fab up an x-brace, that is a great start. I have heard good things about Gordon's setup. It preloads the frame, call it isometrics for the chassis.

Good luck finding a steering brace... I don't think anyone is making them. Same with an x-brace, but those are easier to find on the used market via OEM parts.

I am a huge fan of the Banski rear suspension kit. I did that on my C4 (and did a story for it in the late-great Corvette Enthusiast Magazine, some 10 years ago now!). Not cheap, but sooooo worth it.

You will need to search the hinterlands for some of the parts and be willing to make some parts. The C4 has fallen on hard times and it's sad. But vette2vette and Corvette Salvage will prove to be useful.

BTW, I sold my C4 three years ago... I got a 2006 Coupe... yellow/black with a 6spd. GREAT car. Just great.
Posted on: 6/20 16:10
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw

Education is the best tool to overcome irrational fear. - me

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j3studio Re: Frame flex
Elite Guru
Western Philadelphia Burbs
3737 Posts
Member since:
2007/9/2 0:00



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Everything Andy said.

Ah, the C4 suspension—so much good and so much highly sub-optimal.

If I hadn't decide to remain stock, I would have installed the frame stiffener and the Banski rear suspension.

Posted on: 6/20 23:11
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Matatk Re: Frame flex
Webmaster
SW Chicago Burbs
21842 Posts
Member since:
2008/1/7 0:00



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I'm not sure what Greenwood did to be honest.

I'm not sure it's worth reinventing the wheel. Most people use the convertible style cross brace or the newer vette2vette braces. There is also a front camber brace available.
Posted on: 6/22 20:54
_________________

1989 Corvette...custom 383 stroker, superrammed and cammed, built trans with PeteK 2800 stall. Mustang dyno results: 336 rwhp / 419 rwtq.
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bogus Re: Frame flex
Grand Imperial Pooh-Bah
San Pedro, CA
20608 Posts
Member since:
2005/9/7 0:00



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Greenwood went medieval on the C4 frame... I have seen pictures... they removed the hatch floors and added triangulated reinforcements all in the frame and from the frame up to the halo. In short, they meant bizness...
Posted on: 7/4 16:17
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw

Education is the best tool to overcome irrational fear. - me

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