I dumped the clutch on my drag bike at 8000 rpm every day at the drag strip. It never broke anything even doing just over 1 second 60 foot times. I'm sure that an american sports car should be able to do that at half that many rpm @4000.

Really tell me why would ever want to dump the clutch?

With enough power it's tough to get the car to launch. If it's smoke you want line locks are the way to go.

I will worn you! You better have a tested rev limiter or you take a chance of blowing the motor during a burn out. At the hit of throttle in my 1 & 2 gear you don't have time to look down at the tach. It's into instant bouncing on the rev limiter at my now 7000 rpm red line.

 

I have a question for those who mentioned HP figures and then say this can be done at some sub max HP.

What are you running a diesal electric? This HP figure is only at generally a single rpm and most definately not at 1000 rpm!
Maybe its short hand but any engine 300, 400, 500 isn't generating this power at idle or off idle or low end or.......
Just being picky.

 

In my case the stomp on the throttle burnout is assisted by a 3800 stall 9.5 inch racing converter.

In my old street rod. The flywheel is stored energy. If I quickly slipped the clutch out from idle while applying the gas. It was alot of practise to make the difference between a mini John Force burn out and a really quick take off.

It really depends on motor TQ vs the tire traction.

Our stock Vette parts are really pretty tough unless you shock the system. I just kind of upgraded as things broke. I've just gone through all four halfshaft U-joints in 5 months. It's just the price I pay to play

 

The 502 Ramjet has no hesitation.... it has 500 ftlb @2200 RPM so punching the throttle rolling in 1,2, from idle and @1500 in 3 results in nearly instantanious wheel spin and smoke no clutch just throttle. You do have to be careful as revs build quickly but block long 2nd gear rolling burnouts are easy I'll admit the 3.90 rear gear helps a bit.

Granted It's @ the flywheel and a factory number but I'll get her on a chassis dyno soon, I've seen some numbers posted by the Chevelle guys that indicate that the General is being a bit conservitive but I'll wait till I get my own run. Not for mine is bigger than yours but as a baseline to measure modifications.

Comparing dyno numbers from different dynos is like swapping fish stories!
IMHO

BTW I agree about low RPM. Isnt Torque a function of Brake Mean Effective Pressure and RPM and HP a function of Torque RPM and a constant?

 

 

The new Car and Driver has instructions for a burn out. They recommend placing light pressure on the brake once the rears start spinning. (I'm guessing this directs some holding power to the fronts). This is in an ad for Kumho tires that burn red smoke and are something like $1200 each!!

 

How did it work? I can do this with my anemic 383 with 150 less HP and 140 less ft/lbs. torque than you claim.

With the numbers you state, you should have no problems, at any RPM.

BTW, what year 'vette and rear axle ration?

As late as 8-23-05 you said you were running a stock L-48. Got that big baby installed in good time .

 

With my stock 77 L48 I can get the wheels to spin. Heck with the wife's Mits. Lancer I can smoke them off the start.
SGT Kirk

 

Kids... I'm getting a little grumpy with the wild tales that belong at the drive in or Hotrodders forum.

Ya, I'm old and grouchy.

 

500 torque at 2 grand? whats this thing get when its at maximum breathing rpms- max torque? or is this max torque?
I would really like to see a dyno sheet on this, even if its been cheated on.

gkull brings up a good point. Are any of these idle stomps happening at 3800 rpm? Really don't matter if its idling when you stomp it if the wheels aren't powered yet.

 

Waiting for that dyno sheet....
I got a dyno reserved for the 17th. I got work to do..

 

Eh? wheels are powered at idle with clutch engaged.

peak tq 565@3200

Take it up with GM...

http://www.gmgoodwrench.com/perfpart...f/12497323.pdf

Hmmm HP and torque cross at 5250....

If you look at it the Ramjet is nothing new. It's dimensions are almost exactly the same as the Crower/McKay stack setups used on the Can-Am cars or the cross ram used in the Greenwood cars. This is well documented in the Chevy Power Service Manual 6th Edition Section 6-36:

"Chevrolet's delvelopment testing has shown tha the torque curve of a fuel injected big-block V8 can be smoothed out to eliminate the peaks and valleys that are charateristic of a ram tuned induction system. Figure 115 illustrates the unequal length ram tubes that are reccomended with 2.9 inch throttle butterflies. Installation of these ram tubes as shown will produce a virtually smooth torque curve from 3500 to 7000 rpm in any engine displacement from 427 to 500 cubic inches. this configuration has been extensivly tested and has demonstrated no detrimental effects on the engine."

I plan on getting the car chassis dynoed as soon as I get the drive line done.

A buddy of mine just got his 67 dynoed at C@C w/GM crate Iron head rectangular port 454 rated at 425 by GM w/ the stock 67 tripower setup and it turned in RW numbers almost exactly 80% of the GM published number. Side by side 3rd gear roll ons (3.90 gears in both) the 502 walks briskly away from the 454 as one would expect from the published numbers.

Clutch out idling at 800 RPM in 1 or 2 , stomping the throttle halfway gets instant wheel spin, in third it takes full throttle and the wheel spin starts at 1500rpm then you have to back out real quick to avoid over rev.

More reading from
http://vettenet.org/torquehp.html

The guy asked a question looking for points of comparison I answered him.

 

I feel you will wait forever. He doesnt realize torqueXRPM/5252= HP.

Using his posted, alleged dyno numbers, 550.9 ft/lbs X 4500 rpm/5252 = 472 HP not the alleged 575.

As I said "KIDS". They don't know their math.

I doubt we will be seeing him around, under that name, again.

 

Here's an example of what can go wrong during a burnout.

http://www.youtube.com/watch?v=RcFy-vDXNiI&NR=1

 

This post has been dead since 2005 and was brought back?