Can somone locate the post from NFF "TOP SPEED HP VS RESISTANCE from Silverback"
Can somone locate the post from NFF "TOP SPEED HP VS RESISTANCE from Silverback"
- Thread starter SRT10VENOMOUS
- Start date
Texas Yellow Fever
Full Access Member
I know that not all of this is true or up to date, but it's still interesting to read.
"One Top Fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows at the Daytona 500.
Under full throttle, a Top Fuel dragster engine consumes 4 liters of nitro methane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced.
A stock Dodge 426 Hemi V8 engine cannot produce enough power to drive the dragster's supercharger.
With 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition.
Cylinders run on the verge of hydraulic lock at full throttle.
At the stoichiometric 1.7:1 air/fuel mixture for nitro methane the flame front temperature measures 7050 degrees F.
Nitro methane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases.
Dual magnetos supply 44 amps to each spark plug. This is the output of an arc welder in each cylinder.
Spark plug electrodes are totally consumed during a pass. After 1/2 way, the engine is dieseling from compression plus the glow of exhaust valves at 1400 degrees F.
The engine can only be shut down by cutting the fuel flow.
If spark momentarily fails early in the run, unburned nitro builds up in the affected cylinders and then explodes with sufficient force to blow cylinder heads off the block in pieces or split the block in half.
In order to exceed 300 mph in 4.5 seconds dragsters must accelerate at an average of over 4G's. In order to reach 200 mph well before half-track, the launch acceleration approaches 8G's.
Dragsters reach over 300 miles per hour before you have completed reading this sentence.
Top Fuel Engines turn approximately 540 revolutions while traveling a quarter of a mile! Including the burnout the engine must only survive about 900 revolutions under load. The red-line is actually quite high at 9500 rpm.
The Bottom Line: Assuming all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs an estimated $1,000.00 per second.
The current Top Fuel dragster elapsed time record is 4.441 seconds for the quarter mile (10/05/03, Tony Schumacher). The top speed record is 333.00 mph(533 km/h) as measured over the last 66' of the run (09/28/03 Doug Kalitta).
Putting all of this into perspective: You are riding the average $250,000 Honda MotoGP bike. Over a mile up the road, a Top Fuel dragster is staged and ready to launch down a quarter mile strip as you pass. You have the advantage of a flying start. You run the RC211V hard up through the gears and blast across the starting line and past the dragster at an honest 200 mph (293 ft/sec). The 'tree' goes green for both of you at that moment. The dragster launches and starts after you.You keep your wrist cranked hard, but you hear an incredibly brutal whine that sears your eardrums and within 3 seconds the dragster catches and passes you. He beats you to the finish line, a quarter mile away from where you just passed him. Think about it, from a standing start, the dragster had spotted you 200 mph and not only caught but nearly blasted you off the road when he passed you within a mere 1320 foot long race course."
"One Top Fuel dragster 500 cubic inch Hemi engine makes more horsepower than the first 4 rows at the Daytona 500.
Under full throttle, a Top Fuel dragster engine consumes 4 liters of nitro methane per second; a fully loaded 747 consumes jet fuel at the same rate with 25% less energy being produced.
A stock Dodge 426 Hemi V8 engine cannot produce enough power to drive the dragster's supercharger.
With 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into a near-solid form before ignition.
Cylinders run on the verge of hydraulic lock at full throttle.
At the stoichiometric 1.7:1 air/fuel mixture for nitro methane the flame front temperature measures 7050 degrees F.
Nitro methane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases.
Dual magnetos supply 44 amps to each spark plug. This is the output of an arc welder in each cylinder.
Spark plug electrodes are totally consumed during a pass. After 1/2 way, the engine is dieseling from compression plus the glow of exhaust valves at 1400 degrees F.
The engine can only be shut down by cutting the fuel flow.
If spark momentarily fails early in the run, unburned nitro builds up in the affected cylinders and then explodes with sufficient force to blow cylinder heads off the block in pieces or split the block in half.
In order to exceed 300 mph in 4.5 seconds dragsters must accelerate at an average of over 4G's. In order to reach 200 mph well before half-track, the launch acceleration approaches 8G's.
Dragsters reach over 300 miles per hour before you have completed reading this sentence.
Top Fuel Engines turn approximately 540 revolutions while traveling a quarter of a mile! Including the burnout the engine must only survive about 900 revolutions under load. The red-line is actually quite high at 9500 rpm.
The Bottom Line: Assuming all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs an estimated $1,000.00 per second.
The current Top Fuel dragster elapsed time record is 4.441 seconds for the quarter mile (10/05/03, Tony Schumacher). The top speed record is 333.00 mph(533 km/h) as measured over the last 66' of the run (09/28/03 Doug Kalitta).
Putting all of this into perspective: You are riding the average $250,000 Honda MotoGP bike. Over a mile up the road, a Top Fuel dragster is staged and ready to launch down a quarter mile strip as you pass. You have the advantage of a flying start. You run the RC211V hard up through the gears and blast across the starting line and past the dragster at an honest 200 mph (293 ft/sec). The 'tree' goes green for both of you at that moment. The dragster launches and starts after you.You keep your wrist cranked hard, but you hear an incredibly brutal whine that sears your eardrums and within 3 seconds the dragster catches and passes you. He beats you to the finish line, a quarter mile away from where you just passed him. Think about it, from a standing start, the dragster had spotted you 200 mph and not only caught but nearly blasted you off the road when he passed you within a mere 1320 foot long race course."
Texas Yellow Fever said:
Hmmmm what about that post that silver posted that showed us what HP in theory we would need to reach what top speed acording to our gearing and wind resistance of the truck ,
Texas Yellow Fever
Full Access Member
I have absolutly no doubt that the stock QC's and RC's are capable of 150+mph in stock form. If I lead you to believe otherwise I'm sorry.
What I was trying to was point out two things. I did not agree with John H's comment regarding gearing (4.10 vs 4.56) in relationship to top speed. Gearing does limit the top speed on these trucks. You will not hit redline in sixth gear and run out of speed capability.
The second item I was pointing out is the amount of hp that is required to pick up that additional 10 miles per hour. A few months ago Fasjack posted a table that showed the approximate hp required to reach speeds in 5 mph increments if I remember right. As I stated earlier the hp to mph gains are not linear. Just for the sake of arguement lets assume that the first 5 mph gain required 100 hp. That second gain of 5 mph will require 300 hp, and that third gain of 5 mph will require 900 hp.
And one last thing my baboon bro. Be safe. I believe you and you don't have to go out there and prove anything to me.
What I was trying to was point out two things. I did not agree with John H's comment regarding gearing (4.10 vs 4.56) in relationship to top speed. Gearing does limit the top speed on these trucks. You will not hit redline in sixth gear and run out of speed capability.
The second item I was pointing out is the amount of hp that is required to pick up that additional 10 miles per hour. A few months ago Fasjack posted a table that showed the approximate hp required to reach speeds in 5 mph increments if I remember right. As I stated earlier the hp to mph gains are not linear. Just for the sake of arguement lets assume that the first 5 mph gain required 100 hp. That second gain of 5 mph will require 300 hp, and that third gain of 5 mph will require 900 hp.
And one last thing my baboon bro. Be safe. I believe you and you don't have to go out there and prove anything to me.
hehe im not trying to reach it well i dont think so .. but i remember a good post .. wizzy and i were on the ph talkign abotu this and what kinda hp in theory we would need to reach 200mph like the vipers etc.. and i think i remember something like 2000hp or someting from one of silvers posts .. but woudl just like to see it again .... wizzy was claming a top speed of 156 mph lol.. i only claim 148.. for now 
... i think blake said he hit 155 with ease ...
... i think blake said he hit 155 with ease ...Texas Yellow Fever
Full Access Member
All those conversations are in this thread, I think...
http://www.srt10forum.com/forums/showthread.php?t=6313&page=1&pp=10&highlight=speed+resistance
http://www.srt10forum.com/forums/showthread.php?t=6313&page=1&pp=10&highlight=speed+resistance
Texas Yellow Fever
Full Access Member
Quote:
Originally Posted by Silverback
Actually they will not go that much faster. When you reach those speeds the power to go another 10 mph is considerable. I would guess that Craigs Hennessy twin turbo at a 1000hp would be lucky to go 15mph faster than a stock truck. It will however get to that speed a hell of a lot quicker.
Look at the IRL cars. If I remember right they weigh in the neighborhood of 1600 to 1800 pounds and generate 650 hp. Top speed is in the 225 range. And needless to say, they are a little more aerodynamic than our trucks.
Silver is correct. Our trucks have a horrible CD (similar to pushing a 6' high brick wall down the road) My 1120rwhp truck does get to 150mph pretty quick, the speedo pegged at 160 it had a few more in it but not by much. Lowered, mirrors in, tailgate down or a cover on it I would do 180mph. FWIW at 160mph gas MPG is 1.1 I reset it just before the run, so I'm sure it's accurate
Craig
Originally Posted by Silverback
Actually they will not go that much faster. When you reach those speeds the power to go another 10 mph is considerable. I would guess that Craigs Hennessy twin turbo at a 1000hp would be lucky to go 15mph faster than a stock truck. It will however get to that speed a hell of a lot quicker.
Look at the IRL cars. If I remember right they weigh in the neighborhood of 1600 to 1800 pounds and generate 650 hp. Top speed is in the 225 range. And needless to say, they are a little more aerodynamic than our trucks.
Silver is correct. Our trucks have a horrible CD (similar to pushing a 6' high brick wall down the road) My 1120rwhp truck does get to 150mph pretty quick, the speedo pegged at 160 it had a few more in it but not by much. Lowered, mirrors in, tailgate down or a cover on it I would do 180mph. FWIW at 160mph gas MPG is 1.1 I reset it just before the run, so I'm sure it's accurate
Craig
Texas Yellow Fever
Full Access Member
Quote:
Originally Posted by nowwhat
Got it...but couldn't you reach the rev limiter in 6th with the hp of the twin turbo?
Not even close.
If you read Craigs reply, he has 1120 rwhp. He has been to 160+ and felt it had a little more in it, and if he lowered it, did some other aero mods felt he might hit 180mph.
So lets look at this. Just for the sake of argument lest assume the stock truck had 420 rwhp. The record for the stock truck is 154.something mph. For that extra 700hp that Craig has he is picking up an additional 26 mph. It takes a shit load of hp to gain even 2 or 3 mph at those speeds. It's definently not linear. In other word doubling the hp does not double the speed.
Also redline in sixth gear for an 05 with 4.56 gears would be in the range of 235 to 240 mph. That is going to take more hp than these engines are capable of turning out.
Originally Posted by nowwhat
Got it...but couldn't you reach the rev limiter in 6th with the hp of the twin turbo?
Not even close.
If you read Craigs reply, he has 1120 rwhp. He has been to 160+ and felt it had a little more in it, and if he lowered it, did some other aero mods felt he might hit 180mph.
So lets look at this. Just for the sake of argument lest assume the stock truck had 420 rwhp. The record for the stock truck is 154.something mph. For that extra 700hp that Craig has he is picking up an additional 26 mph. It takes a shit load of hp to gain even 2 or 3 mph at those speeds. It's definently not linear. In other word doubling the hp does not double the speed.
Also redline in sixth gear for an 05 with 4.56 gears would be in the range of 235 to 240 mph. That is going to take more hp than these engines are capable of turning out.
Texas Yellow Fever
Full Access Member
Wizzy = I taken my truck up to 152 mph then I was coming up on the curves so I slowed down.
Texas Yellow Fever
Full Access Member
Did I hit the mark on any of this? I'm quitting either way, I feel like I'm cheating on my wife being over there...LOL!!!
ahhh all helpfull posts thanks.. but to keep you looking there is another one somewhere i think in a totaly diff topic.. silver did some of his MATH and took the aero dynamics , gear ratios ,vs hp of the veichel and put it into some theory if you cant find it thats kool .. the info you have provided is also excellent .. thanks for lookin bro
Stingray
Full Access Member
I found these :dontknow:
Silverback said:
fstjack said:
Yep, that was Jack that did that, not me. I just chimed in on the conversation.
I just chimed in on the conversation.
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