Feng Houzi

I remember reading somewhere, prolly on here, that if the GT was to lose 200 lbs, it would have the same power to weight ratio as the GT500... That got me thinking...

Back seat delete kit... 40 lbs?
Aluminum drive shaft...30 lbs?
aftermarket exhaust.... 8 lbs?
Wheels tire combo..... 10 lbs?
Carbon fiber hood/trunk (ugly, but for weight).... not sure about the weight

With just that you are looking at near 100 lbs lost... not to mention a 1/4 tank of gas, no spare tire...
I dont think that that would be entirely too hard to do... After that you could start taking power seats, power windows, mirrors, a/c compressor off and the like. but I want all those things...
Just thinking out loud...

Daniel60

Good thread unfortunately I haven't the answers.[&:]

howarmat

Wheel tire might be more than 10 lbs.....someone was thinking 50lb for a wheel/tire....it depends on what you have as replacements, but I think you can cut that down more than 10 lbs.

you will be stretching to get 30 from driveshaft unless you use spyders which is supposed to be 28 lbs different.

Not sure about the rest.

Jays Mustang

There is a formula to use when figuring power to weight gains. I remember it in the NHRA days of racing. Maybe punch up NHRA website and they might have it. Or try IHRA. I'll look around, I might have an old race manual but doupt it. It was long ago..............

Jays Mustang

Hi, Back again, I found what I have, it's called a Power Speed Calculator made by Moroso. It's a slide rule type. OK I'll give an example: 300hp in a 3500 car. Weight to Power ratio of 11.65, quarter in 12.55, speed 103mph. Now I'll lower it by 100lb......Weight to Power ratio of 11.27, quarter in 12.41, speed 105. Also has a useful engine RPM at Gear ratio to TIre diameter to read Speed . I.E.:3.31 rear gear ratio at 6000 RPM with 26 inch tire diameter would have a speed of 141 MPH. Useful info for the gearhead.

Ford_Dude

is this an actual slide rule or a website tool

Jays Mustang

Ya me again, to answer your original question. I recently did a thread on Mustang weight and had good responses. Mustang GT coupe on a scale was 3522lb. Now the Weight to Power ratio is11.67. So to lighten it by 200lb the ratio is: 11.05, this is using 300hp. On my thread I was told the Shelby is over 3900lb. So I'll use 3925lb/500hp. Weight to Power ratio of 7.84. So as you can see a big difference. And I know what your thinking, how much weight to lose to get the same ratio, well a lot, the stock 300hp motor you'd have to lighten it down to 2355lb. I hope I helped you out.

Jays Mustang

It's a slide rule I have from my racing days.

TheDarkPath

I've heard quite a few people say the backseat delete only frees up 12-15lbs. If you have 18inch wheels in the front and replace them with some 3.5 inch skinnies, that'll free up 60lbs or so. I've also read somewhere that not much is saved with a carbon fiber hood since the stock hood is already pretty light. For more weight savings, you could lose the spare tire and trunk mat (about 25lbs), if you have the shaker 1000 then lose the subs and amps for about 70lbs (i'll know next week for sure when i weigh it all before i go to the track but that's what others have said). Aftermarket K-member and A-arms will free up about 20-25lbs. Front swaybar delete/radiator support saves about 26lbs. Take out the passenger seat (i've heard conflicting reports of weight for this...50-70lbs). Spyder driveshaft to shave 26lbs. Using the low numbers for all the ranges, that's 219lbs if you don't have the shaker 1000 and 289lbs if you do. I've seen a post on this somewhere where there was a pretty detailed spreadsheet of weights for many different things...i can't find it though.

Feng Houzi

sweet, good replies... like i said... just some numbers i read somewhere... Im not looking to do any of these things, however... If i WERE to change the driveshaft, flywheel, hood, i was just thinking out loud...
I was also told that for every 100 lbs you add to a car, 15 hp is required to keep it at the same speed... any thoughts?