Isn't it 0.1 per 100 lbs?

 

and 100 hp is supposedly worth a a full second increase


so if we follow the magazines rules of thumbs cars making 3000 hp should be running -20's in the quarter-maybe even rotating the world backwards through time on launch....

 

Best response so far lol !!

 

Maybe a tenth by the time they figure out how to make the additional weight work to their advantage.

 

2 tenths to those running all out now. Next to nothing for those who can dial in more power, hell they may go faster.

 

IS YOUR CAR TOO HEAVY?....YOU WEIGHING THE RVW DEAL..BECAUSE OF THE OTHER RESTRICTIONS?...OR IS IT JUST ME..

 

It's a radial...

It will go faster...

 

I think by calculations it is supposed to be 100lbs = .1 and 100HP = .1, but I am sure that everyone here knows that theoretical math.

My guess would be that 500lbs added to a RvW car would probably slow them down about .25 on the first run if you allowed them to adjust and tune for it. It would not take many runs for them though to pick up some of that, but I bet they would still be at least .15 down by the end.

 

from what I understand, for every 100# you should lose .012, so, if you add 500# you should slow down 6/10's in the 1/4

 

Quicker the car is the more dramatic the weight increase or decrease has to be to make a difference. I know on my car when it was running mid 5's in the eighth, 300 lbs cut out didn't even gain a tenth. That is why it's stupid to just keep adding 100 here or there to x 275 cars and RVW cars. It doesn't do a fucking thing anyway....a few hundredths.

 

Yep,i remember back in like 05/06 they threw #200 on the turbo SB deals to try an slow them down..it just helped them load the turbo an they went the same 5 teens lol

If I remember correctly big country said when pirez took 400#s out his camaro an it was a 4.60 car he only gained like .06

The old #100 is a tenth is only good if its a slow ass car

 

Running 11.00's 100# was dead on a tenth. Now at 10.00's it's only .06. I doubt it'd be more than .02 !

 

I can say its for sure not a tenth in our cars, per hundred pounds. But I am curious what some of the other teams say. The reason for this here is what I am looking at.


RVW WEIGHT SPLITS....
SB N/A NO WEIGHT
BB N/A 2100 LBS
SB NOS 2200 LBS
BB NOS 2400 4.840 BORE ENGINES
BB NOS 2525 LBS 5.00 BORE ENGINES
BB NOS 2600 LBS OVER 5.0 BORE ENGINES
-100# FOR BB CONVENTIONAL HEADS

SB SINGLE TURBO 2600 LBS
SB TWIN TURBO 2700 LBS
SB TWIN TURBO (500 CU IN +) 2900LBS
SB PROCHARGER 2600 LBS
BB PROCHARGER 2900 LBS
BB TWIN TURBO 3150 LBS
BB TWIN TURBO (Non 481x / Non Hemi, 550 cu. in. or less) 3000 LBS
BB TWIN SUPERCHARGER 2950 LBS
BB Single Turbo 2700 LBS
4 cyl. and 6 cyl. combos 2500 LBS (Production Engines Only)

ROOTS BLOWER 2675 LBS
BB SCREW 3000 LBS


Now the new rules for LDR.

Nitrous
- SB Nitrous: 2,300 lbs.
- BB Nitrous (4.840/4.900): 2,600 lbs. (Max 10.3 Deck Height)
- BB Nitrous (5.000): 2,800 lbs. (10.4-11.0 Deck, Stock Bore Space)
- BB Nitrous (5.200/5.300) - 2,950 lbs.
Turbocharger
- SB Single Turbo: 2,800 lbs.
- SB Twin Turbos (Pro Mod 88s, Max): 2,950 lbs.
- BB Single Turbo (118mm Max w/ Conventional Heads): 3,100 lbs.
- BB Single Turbo (118mm Max w/ Non-Conventional Heads): 3,150 lbs.
- BB Twin Turbos (Pro Mod 88s Max, Cast Block HEMI/481X): 3,300 lbs.
Supercharger
- SB Single Centrifugal or Roots Blower (14-71 Max): 2,900 lbs.
- BB Single Centrifugal (F3-139/Roots 14-71 Max w/ Conventional Heads): 3,100 lbs.
- BB Single Centrifugal (F3-139/Roots 14-71 Max w/ Non-Conventional Heads): 3,150 lbs.
- BB Twin Centrifugal (F2 Max w/ Conventional Heads): 3,250 lbs.
- BB Twin Centrifugal (F2 Max w/ Non-Conventional Heads): 3,300 lbs.
Weight Additions/Deductions
- MT Pro 275 Tire: 50 lb. Weight Deduction
- MT Pro 315 Tire: 50 lb. Weight Addition
- SB Non-Stock Bore Space Entries Permitted with 100 lb. Weight Addition
- Billet HEMI or 481X Engine, Add 100 lbs. Over BB Twin Turbo Combination

It took years to get people to understand the 14/71 roots is no where near as efficient as the procharger or turbo stuff, and we are going to support this new class, and they have said they would adjust the rules if needed, we would just like to be in the hunt to begin with. I feel our combo is 100 lbs heavy in base weight at a min... Yes its a HEMI, yes its a bad ass piece but so are the others in the class, just looking for some outside eyes.

 

Using a pro boost car as an example here.

John Stricklands car is the quickest roots car in the country right now and went 3.72 in EOPM trim (2450) and 3.79 in PB (2550). So say it is .07 per 100. Add 600 pounds for LDR and in theory thats about 4.21. I think it would be a little quicker than that, but its also a state of the art chassis with good tires and wheelie bars. How much is all that worth vs a radial car?

 

Ok so take away the MAG, and the chassis and wheelie bars, we wont count the tire because we all know the track is the factor. But the chassis, wheelbase, and other factors do play a role.

 

500 pounds is a lot of weight. That's quite a bit of static inertia to get moving. I'm betting that it's probably somewhere between two and three tents for a car of that performance potential and weight range. Of course, when a car like that is slowed down, it allows for different gearing and a more aggressive launch, which could counteract a small amount of that loss. I'd say around .15 for a front running car with factors re-maximized to take advantage of the weight and as much as .4 for a car that simply added weight and changed nothing.

 

.1 is a 1/4 figure first off not 1/8th.
500#s would be huge on a nitrous car but not so much on a boosted car.
Think about it.

 

1/8 #100 is .05 in theory so #500 should be .25

 

As fast as cars are back halfing I think it depends on power adder.

 

It would def depend on that I think both have always been based off n/a deals for 1/4 or 1/8th but like already stated faster the car the less truth in the 100= .1 in the 1/4 theory becomes

 

It honestly depends on the power adder. As someone else said turbo cars have added weight and ran exactly the same or quicker and that's because of the load on the turbo which gets the shaft speed up quicker into the run now 500lbs that will slow even a turbo car down. I would expect 2 tenths on a turbo car, 2.5 to 3 tenths on a screw and 3.5 to 4 tenths on a roots, these are just a guess because I don't know anyone who added that much because 250 lbs is the maximum bolt in weight allowed.

 

A TURBO IS THE MOST EFFICIENT OF THE POWER ADDERS.....BLOWERS....DIFFERENT BIRD....JUST RUN THE NEW 275 CLASS I HEAR THEY'RE COMING OUT WITH....YOU'LL BE LIGHTER...AND LEGAL...AND IN THE HUNT

 

One thing for sure is the car will not stop as fast.

 

And if you crash it will have a considerable amount of more G's on impact too.

 

About .2

 

.2
+4.30
______
4.50.....MEH

 

It's more like .03 or .04 and this doesn't always apply. A car with 500lb added will definitely need a different converter. Sometimes that extra weight can mean better bias to hit with more power. If an x275 car can go 40s at 3300lb, there should be no reason a combo making 1000hp more at same weight, can't run lower 4s

 

Most people forget that if you are guessing at these things, you have to take the caliber of team into consideration as well...Bolting ANY weight into a car, then going faster, only shows that the car wasnt ironed out to begin with...And in a class like RVW, if you aint at the top, bolting in weight aint gonna close the gap up any...The front runners have their shit together, and adding weight to them will in fact slow them down...

Ive heard the stories, for years, about how adding weight to a turbo car will only make them go faster...That is the dumbest god damn shit that anyone can ever say, but they'll damn sure say it...My question was always rather simple, if the guy will go faster, why hasnt he put the weight in on his own? Its not like its mandatory to run at the minimum weights...Then you'd hear the line of, "he would but its harder on parts"...This would be the same people that leaned on their shit as hard as they could, every pass...Weight slows EVERY lined out race car down...

Now, based on Jim's question...It doesnt seem like he is asking the question about placing 500lbs more on the same combo, he is asking about the different minimums between the combos...Is that correct Jim?

 

Ive heard the stories, for years, about how adding weight to a turbo car will only make them go faster...That is the dumbest god damn shit that anyone can ever say, but they'll damn sure say it...My question was always rather simple, if the guy will go faster, why hasnt he put the weight in on his own? Its not like its mandatory to run at the minimum weight

LMAO.
How Many turbo cars are going to be 500lbs over come Feb? Lol.

 

Some people dont understand the "add weight to go faster" for a turbo application, they will never get it.
but....there's a crossover point for success, its not infinate, obviously.

 

On a top notch turbo car, that is lined out completely, more weight WILL NOT make it faster...Going faster with more weight shines light on an inefficient setup.

 

500LBS...IS LIKE STRAPPING A GSXR1000...TO THE ROOF OF THE CAR...

 

Take weight off the turbo cars to slow them down. Pro mod 94 and larger 2600# maximum weight.