No greater truth has been spoken on this subject. If 200HP will get you 100mph ,400 will NOT get you 200mph.just doesnt work that way. co-efficienty,drag,wind AND road resistance,,gets alot greater/faster, the faster you go.
How fast will a C3 go?
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
I haven't read every post in this thread, so I'm sure someone else has already posted this, but maybe it bears repeating, so here goes: The only real answer to the OPs question is another question;
How much money have you got to spend?
I am Captain Obvious, just doing my job, no need to thank me, just pay it forward...........
Scott
How much money have you got to spend?
I am Captain Obvious, just doing my job, no need to thank me, just pay it forward...........
Scott
Burning Brakes
Joined: Sep 2006
Posts: 756
Likes: 2
From: EDMONTON ALBERTA
BTW How fast will a stock 81 auto go?
Cruising
Joined: Feb 2011
Posts: 10
Likes: 0
From: DORSET OHIO
I have a 74 stingray,vin# says its a l-48,my question is ,did the l-48 have a 4 bolt main,forged crank,has nice factory lope,still using points org.system,points have to be shp,heavy spring on point arm,always thought it was a l-82,thanks for any info
Tech Contributor
Joined: Jun 2004
Posts: 20,910
Likes: 962
From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
i don't know if anyone chimed in with this but i'm not going to dig for it either. See post # 353 in aviation, my chosen maledy, aerodynamics tells us that the horsepower requierment goes up as the square of the speed. if you want to go twice as fast you need 4 times the horsepower. say 100 hp gets you 100 mph, want to go 200 you'll need 400 hp. now that's aerodynamics, cars have road friction, driveline losses etc, but you're looking at needing 4 times what you got to go twice as fast....
Last edited by 69427; Feb 27, 2011 at 05:38 PM. Reason: Added post number.
Heel & Toe
Joined: Feb 2002
Posts: 21
Likes: 0
From: friendsville tn
I had a 67/427/435 coupe. In 1967 I ran an autocross set up on an old air force base. I buryed the spedo at 160. The rear wheels began to lift of and the car began to fishtail. Probably my most frighting car ride ever. Won the event but never went that fast on the ground again. also I had a 1952 ford with a 110 hp flathead. It would go 120mph easy.
Safety Car
Joined: Nov 2005
Posts: 3,961
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From: Lompoc, CA. Santa Barbara County
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Advanced
Joined: Dec 2010
Posts: 92
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From: Tucson Az
Well I just tested out my 77, I got her up to 153@ 5700..and it had more...but I was coming up on someone so I decided against pushing it.
Edit: Mostly stock ...edelbrock heads and intake, BW 4 speed.
Edit: Mostly stock ...edelbrock heads and intake, BW 4 speed.
Last edited by Cactus Dave; Feb 28, 2011 at 04:44 AM.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,118
From: Crossville TN
Mathematically, a '75 C3 could run 153 with a manual trans, a 3.08 rear end, and somewhat larger diameter tires than stock size. But, a stock engine doesn't have the torque to push that much wind...especially with a 3.08 rear gear. Unless your engine is HIGHLY modified to produce a lot more power, I'm doubtful that 153mph could actually be attained (and that's putting it mildly). Somewhere in the 120's is more likely.
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
Well, I think it's a little more than doubt. A '77 L-82 made all of 210 hp. Even if your upgrades added 100 hp, you're still well below what's needed to achieve 150 mph. It's basic physics.
...think what you may.
Pro
Joined: Apr 2005
Posts: 591
Likes: 7
From: Batavia IL
Math is not always correct, there are factors that are not brought into the calculation, such as the higher air density in the engines inlet due to those speeds. that can effect hp alot. for example, drag cars that have air scoops or forward facing turbos can pick up a couple 0.10's of seconds in the 1/4 mile due to it. that represents a significant gain in power for the really fast cars.
Le Mans Master
Joined: Jan 2006
Posts: 6,506
Likes: 139
From: Butler Pa
Really? Everything that physically happens in the entire universe can be explained with math (except of course when women are envolved).
I thought I was very generous when I assumed a 100 hp increase with aftermarket heads and intake. You want to add another 50 hp for an air scoop? OK, but it's still not enough.
there are factors that are not brought into the calculation, such as the higher air density in the engines inlet due to those speeds. that can effect hp alot. for example, drag cars that have air scoops or forward facing turbos can pick up a couple 0.10's of seconds in the 1/4 mile due to it. that represents a significant gain in power for the really fast cars.
Pro
Joined: Apr 2005
Posts: 591
Likes: 7
From: Batavia IL
Ok look, the Math itself is without error. I am saying the calculation is wrong because factors are missing and not considered. Ok smart ***, post up your flawless formulas, or are you just pulling this out of your rear?
c4-c5 vettes have no problem doing 150 mph stock btw and they have 250- 325 hp or so. What magic barrier is there on c3's that makes is "IMPOSSIBLE"
c4-c5 vettes have no problem doing 150 mph stock btw and they have 250- 325 hp or so. What magic barrier is there on c3's that makes is "IMPOSSIBLE"
Burning Brakes
Joined: Oct 2008
Posts: 955
Likes: 50
From: Jersey Shore
The fact that C3's are seriously aerodynamically challenged (especially the flat back window cars). There was an article about the drag coefficients from each generation. I think the C3's were the second worst behind the C1's
The speedos are notoriously inaccurate at high speeds as well.
The speedos are notoriously inaccurate at high speeds as well.
Last edited by vette427-sbc; Feb 28, 2011 at 04:44 PM.
Pro
Joined: Apr 2005
Posts: 591
Likes: 7
From: Batavia IL
I dont even have a speedo in my car, lol. I get time slips at the track that tell me how fast I went. you think doing a 8 second 1/4 mile is leasurly enough to look down at your gauges?
yes c3's are less aero dynamic then newer ones, but they are not bricks. you guys get too caught up in hearsay and speculation. even a brick can do 150 mph.
yes c3's are less aero dynamic then newer ones, but they are not bricks. you guys get too caught up in hearsay and speculation. even a brick can do 150 mph.
