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Post  6jeff6 on May 1st 2017, 10:27 am

Anyone run a c4/c5 direct drive for drag racing? I'm very curious on this and it seems to be a hidden way to unleash hp and maximize speed once figured out...
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Post  maverick on May 1st 2017, 12:26 pm

Dunno much about it, but I did have a cousin (MoPar guy) who ran a "Clutch-flite" in his E/Altered in the early '70's. I guess you're thinking of a similar deal.
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Post  6jeff6 on May 1st 2017, 1:32 pm

Exactly. Not much info out there but why wouldn't a person do this on a race car? It's instant power and 10 to 15% more
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Post  whitefield on May 1st 2017, 5:27 pm

6jeff6 wrote:Exactly. Not much info out there but why wouldn't a person do this on a race car? It's instant power and 10 to 15% more

Instant breaking parts especially on a c4 with a big block making decent power. ! Just my two cents
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Post  6jeff6 on May 1st 2017, 6:22 pm

So that's why it was used before they learned how to make more/to much power?
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Post  whitefield on May 2nd 2017, 12:04 am

6jeff6 wrote:So that's why it was used before they learned how to make more/to much power?

Not at all what I was saying. They make a direct drive unit for a c4 but the small parts in a c4 can handle only so much. With a big block ford your going to break parts . I really don't know which came first the coupler or he torque converter. All I am saying unless you have a dedicated race car and willing to spend the money and time to work on it and sort it out. Then the torque converter is the better route to go.
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Post  6jeff6 on May 2nd 2017, 12:19 am

Thanks I get where you're going with that .
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Post  wayney on May 2nd 2017, 6:56 pm

with direct drive auto you get the bad of both( manual and auto) trans in one.you get the touchiness of trying to control the clutch slippage off the line to get the rpm's up and the extra horsepower loss of the clutch packs and extra rotating weight of the auto trans. the reason they did it back in the day was because converter technology wasn't very good like it is today.

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Post  6jeff6 on May 2nd 2017, 7:09 pm

There would be no slippage though so once launched it would be no loss of hp
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Post  Mustang-junky on May 2nd 2017, 9:14 pm

6jeff6 wrote:There would be no slippage though so once launched it would be no loss of hp

Not if the clutches in the trans are slipping.

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Post  octanehuffer on May 2nd 2017, 9:53 pm

Lenco
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Post  6jeff6 on May 2nd 2017, 10:07 pm

And that would be the give to keep the trans alive
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Post  supervel45 on May 2nd 2017, 11:36 pm

6jeff6 wrote:And that would be the give to keep the trans alive

What? Shocked

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Post  6jeff6 on May 3rd 2017, 12:16 pm

Well once set up the gain would be awesome though
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Post  supervel45 on May 3rd 2017, 1:02 pm

Probably Not, there is a reason those went away along with Vega converters.

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Post  6jeff6 on May 3rd 2017, 1:37 pm

Idk I've been looking around an when you see the light cars the shock seems non converter type. That gain is alot when you think about it
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Post  supervel45 on May 3rd 2017, 2:55 pm

The Buick GN guys used to lock up the converters in 2nd gear on their TH200's. Every little bit helps I guess but, I don't see a C4 behind a High HP BBF going over to well with one. The GN guys with a 231 V6 were always breaking input shafts too.

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Post  6jeff6 on May 3rd 2017, 3:41 pm

It would probably take all custom stuff to hold up. Someone used to make a much bigger shaft input an output for it an change all the inside to stout stuff but I can't remember who... I'll try to look it up tonight
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Post  supervel45 on May 3rd 2017, 5:17 pm

The problem is still the little clutch's between them.

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Post  supervel45 on May 3rd 2017, 5:33 pm

Give Carey a ring, maybe he has some parts.

https://www.facebook.com/lane.carey.5

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Post  octanehuffer on May 3rd 2017, 7:17 pm

A C6 input shaft cut down and a bored out stator along with many other mods can help out a C4 quite a bit
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Post  6jeff6 on May 5th 2017, 8:39 am

Thanks man I'll give him a call next week. First test went well on my rebuild of it but traction and nitrous will change that I think lol
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Post  dfree383 on May 5th 2017, 12:19 pm

I'd be looking at a G-force or other Manual transmission long before I'd try converting an automatic, ask yourself why people don't run that setup any more.
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Post  whitefield on May 5th 2017, 5:08 pm

dfree383 wrote:I'd be looking at a G-force or other Manual transmission long before I'd try converting an automatic, ask yourself why people don't run that setup any more.

X2
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