Thanks for the calculator, fun to play with. My stock bottom end, stock heads LT1 comes up with a 3.67 0-60. My simulator has it around 3.8, so that sounds within the margin of error.

Beach bum, are your front tires in the air?

 

Quote:
Originally Posted by MTVette
"Since this thread is on both C4 forums, I thought I'd add my bit to both fora as well.

For those who have timeslips from the racetrack, you can determine with pretty fair accuracy your 0-60 mph times. A few years back I posted a thread here with a link to an Excel spreadsheet that uses calculus and the quadratic formula to do the math. All you do is plug in the times for 60 feet, 330 feet, and 1/8 mile (660 feet) into the table on the top left. It then plots your velocity as a function of time and shows your 660mph time. Go ahead (assuming you have Excel) and try it out.

By the way, the data on the spreadsheet are real, from my 383 C4. Did zero to sixty in 3.1 sec!
I used your calculator and mine came out 0-60 in 2.63 seconds."

Just for fun, I took my 0-60 run & sped it up to 3.1sec. to see just how fast a run that is. This is World Class SuperCar Time. I found it amazing just how far a car travels in fractions of a second. Thanks for the comments, The video link is on YouTube. http://www.youtube.com/watch?v=YbRYqZlubjQ

 

I've been told that old set-up did.... but I never saw it on all the video's I had of it, so I don't think so. However, my new set-up definitely does.

Here is the best launch pic I have of it with the 383.... its close, but no cigar I think. I do not have any good pictures with the 436 yet, but will.



On the 0-60 mph calculator, I think the times are a couple of tenths too quick.... I have a simulator program that is for the dragstrip that also calculates most anything you want and automatically generates the 0-60 mph..... it takes into account everything including gearing, converter, tranny, air, shift points, etc..... a typical C4 corvette modified to run fairly strong that generates a mid 11 second et, mid 1.5x 60 ft time and somewhere around 117-118 mph is going to kick out a 3.3x 60 ft time if its an automatic..... manual transmissions are typically all over the place and a bit slower.

The below is a result print-out of one such simulation.... you can see towards the bottom on the left the 0-60 mph time..... this is pretty darn accurate and if you're the type who can read and understand a timeslip very well..... and you study the run chronology on the left, you'll understand the numbers are pretty good on this simulation. This is a real simulation of my old set-up based upon all criteria and an actual timeslip. Just food for thought.

 

Is gotta be off no way a stock C4 anything is going to run 3.x 0-60 sorry guys

 

Sorry, rolling at 2mph is not 0. There's a lot of momentum in your favor.
Good try though.

 

But I measured the time from 2-62 so I figure its close enough... I cant stop on an entrance ramp to a highway, even going 2mph was prob a bad idea, but it was late and dead so...

 

Forgive me if my reading comprehension is off today, but exactly where did anybody say that a stock C4 was getting these times? My C4, which gave the 3.1 0-60 time, is heavily modded with a custom 383, gears, drag radials, etc. On that particular run, the 60 foot time was 1.539 seconds. Look at my sig for a more complete list of mods.

 

I am reminded of something my advisor said when I was in engineering school at MIT, getting my PhD. He said that if there are two ways of learning something - either by direct experiment or by calculations - do the calculations only as a last resort. Always trust measured data more than calculated results.

In my case, the very good gearing and my launch technique leads to extremely good 60 foot times, getting me up to speed faster than your model's calculations would show. My timeslip shows me going through the traps on that run in 11.558 seconds at only 119 mph. Most timeslips running in the 11.55 area show a trap speed well in the 120's. My particular car has never run in the 120's - it just gets a really good start and then does the best it can after that.

Try to change some of entries in your simulation. My timeslip showed a 60 foot time of 1.539, not 1.569 as your simulator shows, and my 330 foot time was 4.647, not 4.651. If you tweak things to match these measured values, I bet the 0-60 time comes down a couple of tenths.

 

Actually a 119 mph trap speed is more along the lines of a 11.3x et as I have run and others..... back when I ran 11.55, I did that with 117 mph traps typically and even a 116.9 mph trap as I posted here many years ago..... with your 119 mph trap, you're making good power, but you're missing something down low or maybe going down the track, not sure..... your 60ft is good though, especially for that tight converter. But, on strip cars, 119 mph is even good for low 11's and the stockers will even break into the 10's. However, stick shift cars are typically into the 120's when running mid 11's.

As far as your 0-60 mph, I think you're running a solid 3.3x...... but it doesn't matter, its just for grins.

later
Beach Bum

 

I used the word "stock" to describe my bottom end, which is completely original and untouched, and my heads, which are the original heads but I have done a bit of home porting. I usually call them "stockish" since I'm not a pro and I probably didn't gain much with the mild pocket port. But other than that, my car isn't a stock C4 either, I used thin head gaskets to bump compression to 11.3:1, an off the shelf cam, long tubes, 3.73, 3000 stall, MSD opti, probably something else I'm forgetting... But I'm running 12.2 1/4s and a 1.69 60' so 0-60 for sure under 4.