I know my opinion doesn't matter but I'm a post hore.

AFAIK GVW is the car without the passengers or anything but fluids. When I say fluids I don't mean 1/2 tank of gas, 1 quart low on oil, 1/2 the cleaning fluid etc..... I mean fluids topped off lol.

So maybe Jacob's scale is off 20lbs or so but you guys need to loosen up a little bit.

For the record truck scales are typically not that accurate but if it makes you feel good that your car is light then great and if it's heavy don't sweat it just get it corner weighted at your nearest performance shop for bit more accuracy :)

BOTTOMLINE: If you can live without some creatures comforts and don't mind a loud car go for it and you will noticed a measurable difference in performance because our FDs are already light so taking out more is a noticable improvement :icon_tup:

However there's a limit to this and I've witness many a forum member get as addicted to weight savings as others are to modding, for example, spending 1k to save 40lbs in the rear hatch using carbon fiber along w/ plexi glass that will scratch, blow off and not pass inspection is STUPID unless you're RACING. Oh and for the next 6 mofos that post it's more or less than 40lbs I'm just guessing because I'm old and have very little compacity for retaining info.

I'm going to forgot it just like every other piece of information that runs through my filtering grey matter.

Not that much. I don't have the Yamaguchi book in front of me, but he lists the weight of the stock exhaust system. IIRC, it's something like 128 - 138 pounds.
You're not eliminating that weight. You're replacing it with lighter components in some cases. So take what off it? 20% ? (and that may be generous) You're still not coming up with enough.

Where do you get "full" tank of gas? I've seen magazine tests that talk about a half tank of gas. Admittedly there are variations, which is why one mag tests an R1 and lists the weight as 2815, and another reports it to be 2800. And both are a long way from 2660.

How do you come up with that figure? I've held one in my hands and it didn't feel like 50 lbs. And remember, that weight isn't being eliminated. It's being replaced with another component that weighs less.

I just did a quick search. I don't know if the posts are exactly accurate, but they report the precat weighing 18 pounds and the stock main cat weighing 30 pounds. That sounds at least in the right ballpark to me. (not a 50 lb precat).
So once again, you're not eliminating that weight, you're replacing it with lighter components, and in the case of the main cat, you're not shaving that much off of it.

That's useless, today it was 90 on the track.

:)

Dave

This is why we need a "weights and measures" sticky. So we can keep track of what everything weighs including aftermarket parts. My scale says the precat is 18lbs. and the stock main cat 26lbs.. The folding steel chock that comes with the jack weighs 1lb.. The spare tire weighs 18lbs.
I personally would like to know how much the drive shaft weighs, how much stock and aftermarket brake rotors weigh, etc. etc.

Just another data point...

My car weighs exactly 2850 in NASA TTS trim full of fluids and ready to go. 50%/50% front/rear and cross weights. Left side is a little heavy when I'm in it as expected. All in all pretty good.

I haven't done anything specifically to lower the weight of the car, but some of my 'performance' and 'reliability' and 'comfort' mods have shed weight. Of course, some of them have raised the weight as well.

Car started as a touring, but all the touring stuff (except the sunroof) is gone.
Single turbo/exhaust/ic etc etc etc are all aftermarket. Still is fully capable of driving on the street, and is fun!

I thought it was:

GVW = Gross Vehicle Weight = Maximum that the car can handle
Curb weight = stock car with full fluids and no people.

Great! You've given us some info we can work with. I'm big enough to admit when I'm wrong. I've just done some rough figuring and I can get close to the 2660 weight. I'll write down my figures and come back with another post.

And my stock catback was about 40. Here's a thread that lists the weights of many stock components:
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/13b-weight-250486/ 13b weight - RX-7 Owners Club

I think you meant to say "curb weight", and I believe you're correct. ("Gross" is the fully loaded vehicle and is listed on the door jam).

Curb weight
From Wikipedia, the free encyclopedia

Curb (kerb) weight is the total weight of an automobile with standard equipment, motor oil, coolant, a full tank of fuel and not loaded with either passengers or cargo.


Have nice day

P

You guys are so 5 years ago! Check this out:

http://web.archive.org/web/200202050..._reduction.htm

For the record, a downpipe saves about 15lbs, a high flow cat about 20lbs, and a lightweight exhaust about 10lbs for a total of 45lb savings. An intake probably only saves a few lb at most.

^^^^^

Thank you.

The original post reports a '93 base model without a spare tire and jack and with aftermarket exhaust parts and 1/8th tank of gas weighing 2660 pounds.

The published curb weight for the '93 base car is 2,789 lbs.

I've guesstimated the following weight savings.

-12 downpipe replacing precat

-8 high flow main cat

-1 jack removed

-18 spare tire removed

-103 (16.5 gal. removed from full tank at 6.25 pounds per gal.)


142=Total weight savings.

2789 curb weight
-142 removed

= 2647 pounds.


And as Chaosseven reminds us, "No fat chicks."

good catch :lol2:

You conveniently left out part of it, didn't you? You know the part about, ...."organizations may define curb weight with fixed levels of fuel and other variables to equalize the value for the comparison of different vehicles" (See below for full quote.)


"Curb (kerb) weight is the total weight of a vehicle with standard equipment, all necessary operating consumables (such as motor oil and coolant), a full tank of fuel and not loaded with either passengers or cargo.[1]

This definition may differ from definitions used by governmental regulatory agencies or other organizations.

Additionally, organizations may define curb weight with fixed levels of fuel and other variables to equalize the value for the comparison of different vehicles."

So the definition isn't as hard and fast as you claim.

Have a nice day.

Eric Cheatham's old FD wieghed like 2200 lbs or something rediculous like that...
I just poop a lot to compensate for my heavy ass car. :fruit:

just tryin to change the vibe...
cat fights are annoying..:icon16:

thank you :)

I just love cat fights. It's what keeps me interested in this forum :D

Apparently you like the full tank definition.

You still however don't know how much a stock exhaust vs aftermarket weighs which is a little scarey :scared:

Anywho I'm just glad we can all agree that the scales didn't lie :bigthumb:

Plug in any reasonable numbers you want, the weight reductions from his changes to the exhaust system are marginal. You probably eat more than that in Twinkies each day. What we seem to really be talking about here is how much gas in the car. That's where the real weight reduction came from. Running on a 1/4 or 8th of a tank is about the cheapest and easiest mod you can do.

Seen this post this morning & was curious so i headed to my local recycling yard and weighed my 1994 R2.(Full tank gas stock interior with jack & spare tire)
2760lbs



Mods:
Aspec 500r turbo 3 DP rerouted WG to 3 muffler
12x18x3 IC Greddy elbow
Koyo Rad AST
HKS ign amp
Extreme fuel kit with twin pumps in tank (all steel braided lines)
Baker battery (behind drivers seat compartment)
17" NTO3 front & rear (Pilot sport2 Michelins)

I suggest you run a search and inform yourself on the weight savings of aftermarket exhaust parts. The stock stuff is made of thick, heavy material, heat shields, and choked with baffling and deadening material. If you go from an all-stock exhaust to an aftermarket exhaust, the difference is 10s of pounds. Not to mention the hp boost.

I consider that to be a little more than marginal and a hell of a lot more twinkies than anyone can eat.

Dave