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View Full Version : SDAC car weigh ins!



Juggy
07-04-2009, 01:16 AM
well im sure many of yous hopped on that really nice digi weigh in scale!!

list your weigh ins, and what your driving, and loaded with


my 5spd 87 charger weighed in at 2530

approx 2/3 tank of fuel
full interior (no removed seats)
louvers
and myself (175-180)

Mike M
07-04-2009, 02:31 AM
Jumped on there too!

88 Lancer Shelby

1/4 tank fuel, and me (sub box/spare removed).

3050 (~2850 without me)

Keito
07-04-2009, 07:51 AM
86 GLHT with auto trans, T2 conversion and Bogart wheels
Full interior minus the seat back
3/4 tank of gas
I weigh 180lbs
2340 lbs

ATaylorRacing
07-04-2009, 07:58 AM
My SRT4 Pit Bull was 3070 with me and way over 1/2 tank of fuel....normally over there it is at 1/4 tank and weighs 3025-3035.

ATaylorRacing
07-04-2009, 08:06 AM
well im sure many of yous hopped on that really nice digi weigh in scale!!

list your weigh ins......

You guys list your wts with driverand your ets and I'll calculate yor dragstrip HP!

My SRT4 Pit Bull with me was 3070...best ET there was a traction limited 13.5which equates 249.5 hp.....at Indy it weighs 3035 and runs 12.98 with hook which equates 277 hp. Bone stock at 3035 lbs and 13.80 et shows it had 230.9 hp.

Keito
07-04-2009, 08:15 AM
Last time I raced my SRT -4 it weighed 3070 too.

BadAssPerformance
07-04-2009, 09:28 AM
'87 Shelby Z 2.4L
full 10 pt cage
full streetable interior w/o heat or back seat
full exhaust

2715 lb with me in it (180) and maybe 6 gallons in the 8 gallon cell.
11.7000 @ 122

bakes
07-04-2009, 12:45 PM
Jumped on there too!

88 Lancer Shelby

1/4 tank fuel, and me (sub box/spare removed).

3050 (~2850 without me)

holy crap i have a lot of added sound deaden and stereo
3480# my 89 LS with me in it and i weigh in at 210#

ATaylorRacing
07-04-2009, 05:44 PM
'87 Shelby Z 2.4L
full 10 pt cage
full streetable interior w/o heat or back seat
full exhaust

2715 lb with me in it (180) and maybe 6 gallons in the 8 gallon cell.
11.7000 @ 122

WOW...2715 lbs, at least it is lighter than my SRT4.
that wt and that et = 339 hp.:eyebrows:

Shadow
07-04-2009, 06:08 PM
'87 Shelby Z 2.4L
full 10 pt cage
full streetable interior w/o heat or back seat
full exhaust

2715 lb with me in it (180) and maybe 6 gallons in the 8 gallon cell.
11.7000 @ 122

I would have loved to hit that scale. Now that the Q of weight has moved to the forefront, I was talking with a friend of mine that was with me 3-4 years ago when I weighed the Charger.....he says he's 99.9% sure there was no cage in the car yet. Now that I'm thinking about it, I think he's right. I really need to weigh that thing as I could be way off what I'm thinking it weighs! :confused:

BadAssPerformance
07-04-2009, 07:02 PM
WOW...2715 lbs, at least it is lighter than my SRT4.
that wt and that et = 339 hp.:eyebrows:

I prefer the MPH HP calc.... 413.8 :D

Rampage16V
07-04-2009, 11:02 PM
Wow thats heavy ...Your car ROCKS Mike!!!

Rampage was 2245 with me in it 195. hardly any gas left in it (1gallon fuel cell)
Best et that day 10.53 @ 133 mph.

ATaylorRacing
07-05-2009, 12:51 AM
I prefer the MPH HP calc.... 413.8 :D

The nice thing about my calculation is that if you want to find a new et after you theoretically remove a certain amount of wt I can give it to you. Even top fuel dragsters don't show the hp that they really make due to all their clutch slippage on my method.

mario03SRT
07-05-2009, 11:17 AM
I prefer the MPH HP calc.... 413.8 :D

JT,

I use a calculator @ Modular Depot and with a drive train loss assumption of 10% it equals 372 FWHP and 15% it comes out to 394 fwhp.

I think that the latter is probably very close.

FYI,
Marion

ATaylorRacing
07-05-2009, 12:10 PM
JT,

I use a calculator @ Modular Depot and with a drive train loss assumption of 10% it equals 372 FWHP and 15% it comes out to 394 fwhp.

I think that the latter is probably very close.

FYI,
Marion

If you took out 200 lbs can you figure your new 1/4 mile ET?

Using your original 2715 wt and an 11.7 1/4 et = 339 hp on my calculation. If your total wt was 2515 and all other conditions were the same and using the 339 hp figure your new et is 11.4....this thing works every time its tried.

30 PSI SHADOW
07-05-2009, 02:46 PM
Rampage T3 powered
full interior minus heater box
1/8th tank
I weigh 215

2600 even w/ me in it.. seems high.:confused:

11.78 @ 118mph 1.77 60ft

BadAssPerformance
07-05-2009, 05:00 PM
JT,

I use a calculator @ Modular Depot and with a drive train loss assumption of 10% it equals 372 FWHP and 15% it comes out to 394 fwhp.

I think that the latter is probably very close.

FYI,
Marion


If you took out 200 lbs can you figure your new 1/4 mile ET?

Using your original 2715 wt and an 11.7 1/4 et = 339 hp on my calculation. If your total wt was 2515 and all other conditions were the same and using the 339 hp figure your new et is 11.4....this thing works every time its tried.

Wow, I guess I thought there were 2 calcs that everyone used... one for ET and one for MPH? you guys got links or equations? I'm looking to learn...

ATaylorRacing
07-05-2009, 09:55 PM
Rampage T3 powered
full interior minus heater box
1/8th tank
I weigh 215

2600 even w/ me in it.. seems high.:confused:

11.78 @ 118mph 1.77 60ft

Using a total wt of 2600 and a 11.78 1/4 your dragstrip hp is 318. Take out 200 lbs and using the figure of 318 hp your new 1/4 et should be 11.47

The more hp you have the less difference wt makes....take old Matchbox. Last year it was 2060 lbs with me in it. The stock roller cam 2.5 was so stock that if I shifted at 5000 it would slow down almost a half second compared to shifting at 4700! Anyhow....with a total wt of 2060 and a 17.0 et the hp was 83.9....dismal....take 200 lbs out of that and the new 1/4 et should be 16.43.....200 lbs off a low hp car like Matchbox was worth almost 6 tenths...that same amount out of your car was worth about 3 tenths.

ATaylorRacing
07-05-2009, 09:58 PM
Wow, I guess I thought there were 2 calcs that everyone used... one for ET and one for MPH? you guys got links or equations? I'm looking to learn...

Here is how my dragstrip calculation works:

Take entire wt of car and driver....multiply by 200....then divide by the et 3 times for the hp #......to find out what a new et would be with the same everything except wt....take the new total wt....multiply by 200....divide by the previous hp....take that last number and find the cube route of it with a scientific calculator and that will give you your new 1/4 et. Pretty simple when you get the hang of it. :nod:

Gaboon
07-05-2009, 11:47 PM
87 Shelby Charger 2635 lbs with me in it (160 lbs) 21.9 sec @ 48 mph.... I'm thinking somewhere in the neighborhood of 37.5 hp:confused2: Or to find a gear or two...

contraption22
07-06-2009, 01:36 AM
Crap, wish i had known about the scale!

Juggy
07-06-2009, 09:05 AM
87 Shelby Charger 2635 lbs with me in it (160 lbs) 21.9 sec @ 48 mph.... I'm thinking somewhere in the neighborhood of 37.5 hp:confused2: Or to find a gear or two...

:lol:
tell you what, ill trade you a complete 2.2 TBI motor for what you got under the hood!! then u can break the 90 hp mark :hail:

ill even throw in a stock TII garrett :eyebrows:

ShelbyZ
07-06-2009, 01:26 PM
My Caliber SRT4 weighed in at 3340lbs with me in it at 200lbs and 1/4 tank of fuel.
Best 1/4 mile of the day at SDAC was a 13.3@107 mph.

Gaboon
07-06-2009, 05:04 PM
:lol:
tell you what, ill trade you a complete 2.2 TBI motor for what you got under the hood!! then u can break the 90 hp mark :hail:

ill even throw in a stock TII garrett :eyebrows:

Let me think about it for a day or two but I'm thinking DEAL!!!!:nod:

ATaylorRacing
07-06-2009, 08:13 PM
My Caliber SRT4 weighed in at 3340lbs with me in it at 200lbs and 1/4 tank of fuel.
Best 1/4 mile of the day at SDAC was a 13.3@107 mph.


283.9 hp

fleckster
07-06-2009, 10:21 PM
Spirit R/T with 3/4 tank of fuel and me in it:

3360lbs. - me@280lbs=

3080lbs.


Best mph in this config was 102.77mph.

fleckster
07-06-2009, 10:26 PM
Here is how my dragstrip calculation works:

Take entire wt of car and driver....multiply by 200....then divide by the et 3 times for the hp #......to find out what a new et would be with the same everything except wt....take the new total wt....multiply by 200....divide by the previous hp....take that last number and find the cube route of it with a scientific calculator and that will give you your new 1/4 et. Pretty simple when you get the hang of it. :nod:

What about the difference between street tires and slicks? My car has run 102mph with and without slicks but it went 13.34 with and 13.77 without?

W.P._Turbocars
07-08-2009, 09:52 AM
Wow thats heavy ...Your car ROCKS Mike!!!

Rampage was 2245 with me in it 195. hardly any gas left in it (1gallon fuel cell)
Best et that day 10.53 @ 133 mph.

Wow what all do you have taken out of the truck? Mine weighed in at 2330 with a third tank of gas. and that was without me in it which is another 260#'s:( (Local scale)

Juggy
07-08-2009, 10:05 AM
Let me think about it for a day or two but I'm thinking DEAL!!!!:nod:

did u think bout it yet :eyebrows:
ill even do all the work for u!!! :lol:

ill even throw in some spooning time :nod:

Rampage16V
07-08-2009, 10:29 AM
Wow what all do you have taken out of the truck? Mine weighed in at 2330 with a third tank of gas. and that was without me in it which is another 260#'s:( (Local scale)
Glass doors and hood. no bumpers, fuel cell..thats about it roll bar is 100 lbs
weight of turbo honda race class is 1900 lbs so its still heavy in comparison\

Juggy
07-09-2009, 12:18 PM
My Caliber SRT4 weighed in at 3340lbs with me in it at 200lbs and 1/4 tank of fuel.
Best 1/4 mile of the day at SDAC was a 13.3@107 mph.

i thought they weighed 2 or 300 more then that?


283.9 hp


you got another calculator???

because his car was DYNO'd at 334whp not 2 long ago :thumb:

sdac guy
07-09-2009, 01:35 PM
My Caliber SRT4 weighed in at 3340lbs with me in it at 200lbs and 1/4 tank of fuel.
Best 1/4 mile of the day at SDAC was a 13.3@107 mph.

283.9 hp

you got another calculator???

because his car was DYNO'd at 334whp not 2 long ago :thumb:The weight listed vs the power from the dyno would indicate a Weight to Power ratio of 10.0. That W/P ratio should run 109 in the 1/4, and that is close enough to 107 to be nearly correct. This is where the ET calculator fails to indicate accurate horsepower.

To look at it further though, a 10.0 W/P ratio ideally should run a mid 12, and I think that if it did, then Angelo's ET calculator would come closer to agreeing with the dyno figure. John's 60ft times might be an area he can improve on. Probably a lot of tire spin leading to a slower than possible ET.

Barry

Rampage16V
07-11-2009, 09:22 PM
87 Shelby Charger 2635 lbs with me in it (160 lbs) 21.9 sec @ 48 mph.... I'm thinking somewhere in the neighborhood of 37.5 hp:confused2: Or to find a gear or two...

LMFAO :thumb::eyebrows:

ATaylorRacing
07-12-2009, 11:00 PM
I know of guys with over 400 hp on a chassis dyno in 3000 lb cars, but on the drag strip with tons of traction issues their 1/4 miles do not reflect their true hp....my calculation ONLY takes the total wt of car and drive...and ets. It works great on cars that have excellent hook. Top fuel cars on my calc don't make the 8000 hp that they more than likely really do make since they have to slip the clutch in order to get decent hook.....and only have direct drive with no tranny. A guy that lives in Kokomo has a Dakota with a alcohol monster motor in it....he ran quicker in the 1/4 when he had a bad plug running on 7 cylinders rather than all 8 because he finally hooked! Remember...mine is a Drag strip HP cal....take it with good hook and identical conditions then use it to see what times you could run with ...lets say 1000 lbs less wt. Kind of like if I took the drivetrain from my 2850 lb SRT4 and stuck it into 1810 lb Matchbox....It might have to be rear wheel drive to hook....or run zero off set rims and 31 inch slicks!

Keito
07-13-2009, 07:44 AM
My Caliber SRT4 weighed in at 3340lbs with me in it at 200lbs and 1/4 tank of fuel.
Best 1/4 mile of the day at SDAC was a 13.3@107 mph.

Just curious, what 60 ft. times were you pulling?

Juggy
12-30-2009, 11:08 AM
Just curious, what 60 ft. times were you pulling?

i think it was 2.1XX

with drag radials on a 16" rim

only shaved him 1 tenth from the stock rims/tires