PDViper77

iTrader: (9)

Mine weighs 2725lbs with everything removed but the AC stuff. Also that was with my heavy *** woofer in the trunk.

GooRoo

iTrader: (4)

My car weighs almost exactly 2800 full of all fluids. Car's interior still is nearly stock inside, with some extra stereo stuff. It started out as a touring model.

Removal of:

P/S
A/C
all Emissions parts
Front Re-bar

Then of course there's all sorts of parts that got swapped for others, some lighter, some heavier:

Turbos
Exhaust
IC
Suspension
Trailing Arms/Toe Links
Intake
Nose
Wheels/Tires

And a few parts I added outright:

Splitter/Undertray
Diffuser
Rear Wing

cloead

black car w/ stock twins, a/c and p/s = 2680 w/ a 1/2 tank of gas
red car w/ single turbo, no a/c or p/s = 2700 w/ a full tank of gas

turbogarrett

iTrader: (1)

94 touring w/ glass roof, leather seats, roll bar, heavier than stock wheel/tire combo, no a/c, ps or bose sub, ls1/t56 w/ ~ 1/2 tank = 2750 lbs.

jic

iTrader: (1)

i dont know if the smog station has an accurate weighing scale but on the paper it says 29xx lbs.

azn akira

i got my car corner weighted a little while ago i believe without the weight in the drivers seat added for me it was 2667 lbs with a little over 1/2 tank of gas. 94 touring w/glass sun roof.

Rotary4tw

iTrader: (3)

Weighed the FD tonight at a weight station:

Static Scale Reading: 2680lbs with a full tank of gas. (Within one gallon of capacity, I had to drive 8 miles to get there.)

Man it would be great do get it down another hundred or so...

-R4tw

turbodrx7

iTrader: (43)

I weighed in at 2660 last time i weighed mine. That was with a full tank of gas and with some stuff in the trunk. I have the ps and ac removed.

-Austin

matty

u guys are pretty light. especially for a full tank of gas.

RX7 RAGE

iTrader: (22)

2700 with a 1/4 tank of gas, stock twns, and all the bolt ons.

Sled Driver

iTrader: (9)

Very good point. We should post OUR weight too. Plus if it hangs to the left or right.

Cracks me up when people think 100 lbs is going to make ANY differance on a street car.

Has nothing to do with driver ability or car set up..............

Everyone knows you automaticly go WAY faster if you remove spare tire & jack, rear wiper blade, license plate, passenger visor, cigarette lighter................

Rotary4tw

iTrader: (3)

The difference can be noticable.

Well, when you get the car to its limits with your current turbo setup, and have done all of the proper modifications, there are really only a few things left.
1) Driver Ability (always working on that)
2) Tires/wheel (unsprung weight, size, grip etc)
3) Weight (gross)

I think our cars have a HUGE advantage in their light weight, and it's the reason why a 400rwhp FD can hang with cars that are making much more power.

Last night I was re-reading through a bunch of the posts about the GT500 Shelby and about its curb at over 3800lbs. We ran into a brand new one at Road America, which was tuned the weekend before at 485rwhp. GooRoo was likely making around 360-380 at 15psi... and he could pull away from that Shelby with no problems.

This was giving the Shelby a Weight to HP ratio of: 7.84
This was giving the FD a Weight to HP ration of: 7.47

That's a 100 hp difference, and the FD was still quicker.

The Mustang GT's weigh in at about 3600lbs?
Supras sitting around 3550?
STIs over 3100?

My theory is, we already have an advantage with our light weight. If we want to improve performance even more, capitalizing on that is a fine option for some of us.

-R4tw

Gohan3rdrift

iTrader: (11)

2782 lbs.........
single turbo
no p/s ,a/c,
10 gal of gas
full interior

4600 lbs.........
8 marine batteries
4 red's hydraulic pumps
16 switches
3- 13'' 100 spoke gold daytons
1- spare tire (doughnut)

my rx-7 ROX

pwwatkins

My brother weighs 250 lbs and I can easily notice a difference when he is in the car.

Sled Driver

iTrader: (9)

100 lbs

NOT

100 hp

was my point...........

Anthony Colin Bruce Chapman (Mr. Lotus) & Ferdinand Porsche (guess) proved low hp & light weight will beat high hp heavy cars on short tracks, but never at Le Mans

Your example of the Shelby doesn't list the drivers experience. A moron can own/drive the Shelby & lift on the straight due to fear.

I witnessed a stock Ford Focus beat a supercharged Mustang GT at a local autocross.

I have added a passenger during numerous autocross events & got faster times.

I challenge YOU to notice the difference 100 lbs, either way, makes.

Besides notice a constant here? The majority of the cars weigh around 2660 to 2760. Always have, always will. Truck scales? + - 50lbs, not very actuate.

What is really more important is how much weight is concentrated on each corner (balance), but you knew that...................

jacobcartmill

iTrader: (6)

100lbs is easily noticable when racing in a straight line.

there are so many more factors that play in when you're talking about road racing that i agree with you, sled driver, but in simple acceleration comparisons it is easy and obvious to say that 100lbs is noticable.

Rotary4tw

iTrader: (3)

"Trust me Damian, the pedal is to the metal!"
About the 6th min, you see GooRoo catch up on the straight at RA.

Driver ability was pretty constant between the two drivers. GT500 owner normally runs another mustang, which pretty much beats up everybody and holds pace well with Damian. (If anything the Mustang driver has more seat time and sessions at Road America then GooRoo, but both are amazing drivers.) I assure you both cars were driven at 9/10ths when they were playing with eachother.

Yes, this witness was likely more due to driver ability, rather then performance ability of the two cars for the sake of weight to horsepower analysis, but it's always impressive to see the little guy beat up the good guy.

From my limited knowledge, there are ALOT of factors in auto-x and road racing, apart from weight to hp, that can influence your overal lap times.

I guess my analysis had more to do with raw acceleration on the highway, or some sort of drag race-straight line type deal.

Isn't it more likely was likely that your first run wasn't as clean as your second? I think the non-dunce hat wearing population would agree. -"We agree"

In my limited experience on the track, and talking to other seasoned vets, when they talk about their clean laps, 90% of the time it's when they are not doing ride alongs! Or, it also could be that with your line/session, the added weight actually helped you in the handeling department, gave you better exit speeds etc. But who knows, there are tons of variables there...

Take both runs, you driving by yourself, and you with a passenger, and superimpose them on a straight line... and it's very unlikely that the added weight scenario will give you faster acceleration. It would probably be noticable too.

I will have to take you up on this sometime, actually, GooRoo may have some data from his Gtech that measures acceleration G's in his track car. We could come up with some sort of equation per 100 pounds as it affects the g-accel.

Taking the challenge in a slightly different direction, I have expereinced a NOTICABLE, and by noticable I mean it feels like the boost is up 2-3 pounds... difference from losing approx 64 lbs (16 lbs per corner) of unspring mass in the wheels/tires. These variables of unsprung weight are much more influential in the mass/acceleration equation.

From my research, the ranges are between 5lbs and 20lbs (mine was 20), also, most people corner weight their cars too so this inacuracy is likely overstated.

For straight line acceleration? I did not know that. I know it's important to have the car corner balanced for suspension adjustments, but that level of config is more at the GooRoo/Damian level, wheras I'm still many many seasons away from that level of setup!

-R4tw