200mph?

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Jul 18, 2005 | 02:22 PM

#61

luvmy92

Melting Slicks

Joined: Apr 2000

Posts: 3,490

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From: Oviedo FL

If anyone knows what C4's are capable of on the big end it would be 8388. I have read numerous stories where he has gone 190 plus in his awesome collection of C4's.

Mike

Jul 18, 2005 | 05:08 PM

#62

redbullapril23

Drifting

Joined: Aug 2004

Posts: 1,830

Likes: 1

From: atlanta Georgia

I have to say I have taken mine pretty much stock to 152 mph
that is with an A4 and stock 2.59 dana 36. and it was turning i think 4 grand. and then i let off the gas. keep in mind i have no ac and my car weighs about 2900.
it was completely stable.
and I expect it to be even more stable once i install the 4 pt weld in roll bar.

once I get the n20 i will try top speed.. maybe 170? 180?
I know stock with headers and muffler elims it reached 170 on the dyno... but its not the same as on the road.

200 mph + wow!

your friend
Sean

Jul 18, 2005 | 11:34 PM

#63

Jeffyvette

Drifting

Joined: Oct 2000

Posts: 1,396

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From: Sacramento CA

This is what it takes on public roads to do 200mph

See the C4 below. 600rwhp, many aero mods, weights only 2640 lbs.

Jul 19, 2005 | 02:58 AM

#64

Casethecorvetteman

Le Mans Master

Joined: May 2005

Posts: 5,214

Likes: 65

From: Queensland, AUSTRALIA

Quote:

Originally Posted by Jeffyvette

See the C4 below. 600rwhp, many aero mods, weights only 2640 lbs.

Which C4 would that be Jeffy? there is nothing below...

Jul 19, 2005 | 11:01 AM

#65

Carl Johansson

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Joined: Sep 2004

Posts: 1,638

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possible source for rear end "lightness"

I thought about this last night. One of the things that most people overlook is airflow under a car. The big boys use the front air dam to limit the amount of air going under the car.

Regardless any air flowing under the car will encounter a "bottleneck" as it flows through the rear end = axles, diffs etc - essentially squeeze down - this results in lower pressure and higher speed for the air flowing through the restriction (a big venturi valve). as the air gets through it goes to a higher volume - that means slower air and higher pressure - and it also induces turbulance - I guess in theory this could be enough to destabilize the car. (removing the plastic tray for the spare tire changes the rear end volume quite a bit!)

This is why alot of C-3 guys who know what they are doing, have rear appendages under the car that channel the air out the back end - smoother flow - and keep"new air" from being introduced from behind the rear wheels (reducing turbulance). Burners over in C-3 has one - I think George Kull does too. I have a picture of one if someone wants to see it.

Carl Johansson

Jul 19, 2005 | 11:24 AM

#66

Casethecorvetteman

Le Mans Master

Joined: May 2005

Posts: 5,214

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From: Queensland, AUSTRALIA

probably got a bit to do with air flowing under the rear tires too, since the lower 1/3 of them is pretty open with the standard body...

Aug 24, 2005 | 04:54 PM

#67

bacardioil

Pro

Joined: Nov 2004

Posts: 637

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From: Perth Amboy N.J.

bruce,
if your going to carlisle this weekend, the guys you want to talk to about c4s going 160 and above are the greenwood brothers.

Aug 24, 2005 | 05:14 PM

#68

DieL

Melting Slicks

Joined: Mar 2003

Posts: 2,472

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From: Toronto ONTARIO

using 6th gear for top speed runs iw ouldnt reccomend. i found out the hard way when i had 4.09 gears and used to use 6th to accelerate .. by bye zf. apparently the 6th gear synchro is shared with reverse and cant handle high loads.

sure the sledgehammer felt a little unstable.. but 254 is a lot different than 200 mph.

with 4.09 rears and a 305/30/19 ive taken 5th to 7800 rpm