jughead

not to join this arguement, but in the early 50s when i was in high school number crunchers said that the 150 mph mark in a 1/4 was as fast as one could possibly go. now u know about how ancient i am. look where they are now. dont know how quick a diesel can be. this is just a quote that stuck in my head a long time ago

gunracer1

well how much hp does it take to push maddogs old 4x ford to 130 mph trap times, and no calculator will even be close with the air drag of that old ford.

600 Megawatts

Now, I never said there was any limit to ET in the 1/4M, its all about HP/Torque and traction. Top fuel record right now is at 4.44 seconds at 336 MPH, which equates to around 10,000 HP and as you said was unheard of even ten years ago.

My point is that its gonna take close to 2,000 HP to put a 4,000 Lb truck into the 8's. I dont see many people making 2,000 HP with their 5.9L CTD. And when I suggested that some guys are making 1,000 HP, I got slammed. So there is a disconnect here thats all.


I would say roughly 800HP would push a F350 to about 130 MPH in the 1/4 depending upon weight. I base this on times I know and are familiar with in NHRA stock eliminator truck class racing, and the power I know those trucks make.



KP

timbeaux38

If you go to smokemup.com you can figure it out. If Comp had a Motor from GA- last dynoed at 777 hp he would proably be in the REAL Low 8's if not high 7's he is only making about 650 per his weight and E/T. Now Richard is making every bit of 1000 HP and everybody goes "where is the dyno graph?" I only know of a few high HP trucks that even have them.....but think about this: Darren ran a 10.61 with about 720 hp in Indy. his truk is proabaly a hair under 6k lbs. Richard ran a 10.59 at over 7k lbs...

600 Megawatts

Ok guys, now you have some poor data.

Who is Comp and what vehicle weight are you saying he is going to be able to run low 8's or high 7's in with only 777 HP? There are plently of 700 HP gas dragsters that weigh 1,800 Lbs that cant nip the 7's.


Also, I dont know who Darren is either, but let me tell you, that 720 HP will NOT push a 6,000# truck to 10.60's. Not on this planet or in this dimension, or galaxy, EVER. Again its all physics and it doesnt lie. So he is either, lighter, or is making more power. Period. I would guess he is making more power, but I dont know and cant comment on that. It probably has to do with 'dyno' 'numbers' from an inertia dyno. Its probably making way more real power than 720, but I should not really comment. I CAN and WILL say that 720 HP WONT, CANT, IT JUST DOESNT WORK, push a 6,000# truck to 10.60's.


KP

bama

i bet darren has helium in his tires

jughead

amen bama numbers and real life just dont match

600 Megawatts

Don't try to imply that I am a 'numbers estimating guy'. I am a FACTS guy and I AM talking about real life. I have well over one thousand passes down the 1/4m in four different cars over 15 years at a dozen tracks and countless REAL dyno (aka: water brake engine dyno) pulls with a wad of timeslips to go with them. Plus lots of very close friends who have the same or TONS more pulls and passes than me. I was not the one who pulled numbers and 1/4m estimates out of their sphincter or ran 'calcs' on an internet shareware drag strip estimator. My statements are based on real life facts and experience.

So much crap is put out there, by manufacturers, vendors, mail order speed shops, inexplicably brainless TV 'hot rod garage ' type shows and un-informed so called 'experts' that is difficult to weed through all the hype and get to sound FACTS. Thats why on this forum and the drag race forums I frequent, you will allways see me 'bucking the system' when I see nonsense being spewed.

Please don't anyone, take any of this personal. I just cant stand when innaccuracies are spread and people begin to believe them. I am allways trying to steer techincal conversations back to sound FACTS.


Sincerely, and with regret for anyone offended.

KP

bama

newest rules for pro street trucks-..........5000 single(lp&h20 allowed)..5500 1 power adder(such as nos or twins).........6200 dual power adder....

600 Megawatts

I asume you are talking about weight breaks?

mhuppertz

Mega is correct on this. The Jet powered trucks can't even hit the 8's. The coeficient of drag is exponential, meaning the faster you push a bay window down the track the HP required to maintain a certain acceleration rate increases by multiples, not a straight diagonal line. I have owned a 1968 HEMI road runner that was in the 11's through the mufflers on fat radials, and that car was a 4,000 pounder putting out in excess of 600 screaming elephants with about the same torque. As much as I love these CTD Dodges, there 'ain't no way!

db

I agree with your hp vs. 1/4 mile times. Those calculators are really close to real track times. I also know those calulators are based on gasoline hp with simular or less torque than hp ratios. For example a 500 hp Dodge viper has roughly 500-550 ft. lbs of trq. Were a 500 hp. CTD would have what? 1000-1200 ft. lbs.
I wonder what this does to the to 1/4 mile calculator.
You can't tell me a 4 cylinder 500 hp ricer motor with 300 ft. lbs. of trq. in a 7000 lb. pick up would transilate to the same 1/4 mile times as a 500 / 1200 CTD in the same vehicle.
What these low hp , high trq. trucks really need is a race built 6 speed auto (or Lenco??) to take full advantage of there strenghts.
That's my thoughts anyway.

db

bama

yessir,,that was weights,,,,,,,dhra record is fletchers truck this year,on a 10.13 pass...its been said hes went in the nines already but not officially.now the way i understand it is,he could be underweight for a timeslip,,but not for actual competing,but im not sure on that.and when maddogs truck gets right,youll see some deep 9`s for sure i bet,but once again,not guaranteeing weight...comps tube rail glass truck has already gone a 8.7something,and if a tdr member would ask him,im sure he would tell his weight......one things for sure though,the really fast trucks are pretty quiet on their weights..............bama

gunracer1

i think the big part you are missing is that most of the diesel world deals in rwhp#s, not flywheel#s. and i belive comps so called truck weighs in at 2300 or so

600 Megawatts

Well yes sir, using rear wheel HP numbers is a difference, on the order of 5% to 15% depending drastically on drivetrain components. And a 2,300 Lb 'truck' is a far cry from a 4,000 Lb street legal truck.


KP