Pete,
What's really sad is Nathan already posted it in this thread but some ***** are just plain lost in the OZONE.

I can't take it I tell you lol

Anywho I'm sure after this thread a lot more FD owners will be edumacated about exhaust weights

FAWK!!!!!!!!

 

good job finding the list fritz.

 

thank Nathan instead

 

That's just saying you can't meet the challenge.

You're done.

 

You're pulling numbers out of thin air and talking in the abstract with these supposed numbers.

Apply it to this particular case.

You've got a weight of 2660. Stock curb weight is 2789.

You're hemmed in by certain parameters. You've got to subtract the missing weight of 7/8ths of a tank of gas, plus the removed jack and spare tire.

Now fill in the remainder with the aftermarket exhaust components weight savings. It ain't much.
Go ahead. Show us the math. Formulate an equation instead of posting numbers that have no relation to this actual case.

 

He can't give you exact numbers because we don't have exact information. What sort of hi-flo cat does he have? He didn't say. How about the specific brand of catback? Also didn't say. The stock exhaust system comes out to ~85.6 lbs. depending on what scale you use. This is according to various reports over the years from different sources that have been compiled Here. A full aftermarket exhaust system, using the average of heaviest and lightest components, weighs in at 43 lbs. giving you a 42.3 lbs. difference, which is a considerable amount when it comes to weight savings. The jack and crank handle come in at a whopping 3.44 lbs., but we'll round up to 3.5 to keep it simple, and the spare tire is 21.5 lbs. So far we've lost 67.3 lbs. In 1999, a motorcycle mag reported that a gallon of gas was 5.6lbs., meaning a full gas tank would roughly equal 118 lbs. with 1/8 of a tank being ~103.25 lbs in weight savings. 103.25 + 67.3 = 170.55 lbs. in total savings. If you take that way from the stock curb weight that you posted of 2789, then actually you come out with 2619 rounded up.

Disregarding what I posted above, if you wanted to go with the lightest exhaust system that we have numbers for, you'd weigh in at 27.2 or so. That's 58.4 lbs. of twinkies you're talking about there, I don't think I could put away that many in a year, much less a day.

 

See this link: https://www.rx7club.com/showthread.php?t=653629

You'll see this same car for sale w/ a mod list so simply use the list in this thread to come up with a weight savings or gain comparison for parts added, parts deleted and replaced. I'd suggest using a full tank of gas at 72 degrees for scientific purposes but if you prefer to use your exact guess of how much gas is in the tank based upon what his car reads at 1/8th of tank then go ahead but I won't even begin to list all the problems with that scenario hehe.

I'd do it for you but you seem to be a slow learner and it would benefit you to try this one on your own. If the rest of your comparisons are anything like the exhaust this thread may never end

 

No, it's saying "the challenge" was met 8 YEARS AGO. It's old news. Common knowledge. Asked and answered 100's of times, long before you crawled out from under a rock.

You act as though the fuel weight is the "given" from which the weight of components can be calculated, but that is not the case. "1/8 tank" has alot of variables to apply that could affect the actual weight. There are also unknown variables in the components because we don't know the brands of aftermarket parts used. What we DO know is the weight of the stock stuff, and we have many reference points as far as typical weights of aftermarket components, which in almost every combination produce a weight savings figure that is higher than your uneducated guess, and is most certainly significant.

I don't see any reason for me to waste time walking down to my garage, weighing all three stock exhaust components, and then spending hours removing my aftermarket stuff to weigh it in order to satisfy someone who's too pig-headed to believe what he reads.

Read the list Fritz posted. You got OWNED pal. Repeatedly and miserably.

 

why?

 

wow fritz gets mad. unreal.

i bet this guy is a domestic fbody owner

 

That's actually a little low. A gallon of water is 8.34 pounds, and unleaded fuel has a specific gravity of roughly 0.72 to 0.80. See VP's site for gas specs. Other references available via Google.

 

Agreed. I've seen most pump fuels average 6 lbs./gal.

 

Wrong! The original poster reported a weight of 2660 lbs. not 2619.

When you subtract the weight of the missing gas from a full tank, the jack, and the spare tire from the 2789 curb weight you don't have much left over for exhaust component weight savings.......despite the claims made elsewhere on this thread.

It's all gotta add up people.

 

FAILED !

Despite the repeated personal insults aimed my way, Mr. Flynn wasn't able to produce an equation that meets the 2660 lbs weight and includes his claimed weight savings.

 

I'm not going to read this entire debacle of a thread, but trickshot---maybe some of the other changes he made added weight? lots of mods (like intercooler, rad, etc) can add weight to the scales......

 

You miss the point entirely. *YOUR* exhaust components don't matter. I seem to be the only one here who's able to remain on the point.

The point is how did this particular owner reach his weight of 2660 lbs. Answer?
The main contribution was made by having his gas tank only 1/8th full.

As a side point, some here apparently have some sort of dogmatic faith in exhaust weight savings. You'd think their religion had been challenged.

Who the heck knows what aftermarket exhaust components he has on his car?
I don't particularly care. But I do know this. Whatever he's put on, it hasn't saved anything like 50 pounds. You can't insert that figure into the equatioin along with the missing gas, jack, and spare tire and arrive at 2660 lbs. Plug that number into the equation and you'll come out way below 2660 lbs.

So for all the yammering here, no one has produced an equation that meets their dogmatic claims for exhaust weight savings. Not in this case, gentlemen.

 

Are you referring to me? I've owned my FD from new.

 

my fd reads 3210 lbs on the driver door jam vehicle manufacture sticker. why is this?

 

thats gross vehicle weight: 2 people, full tank, 50lbs of luggage (i think)

 

are you all still arguing?


of those arguing, have any of you weighed your modded FD's (preferrably R1 or base models) with mods? i have a custom 3" downpipe, 3" magnaflow hi-flow cat, and RB single catback. it's heavy, maybe slightly lighter than stock.


i had 17 fewer gallons of gasoline, a removed spare tire and jack. i'm not sure why everyone is still arguing about the 2660.

 

thank you for the info help.

 

Did I mention we should have a weights and measures sticky?

Just thought I'd hit that dead horse one more time.

 

cause u got fucked. u bot one of the heavy ones. mazda made 2% of the rx-7s produced weigh more in an effort to bring up the average weight of the total vehicle product line.

 

Have one of your parents read the whole post to you, and expliain it.

You CANNOT determine exhaust component weights accurately based on the original poster's stated vehicle weight. Why you ask? Well, as Mommy or Daddy will likely tell you, we don't know the exact weight of the fuel on board. "1/8 tank" is not a complete enough description to start talking pounds with any accuracy. SO, stop telling me about plugging numbers into an equation, because there is no equation to be used here. WE DO NOT KNOW THE TRUE WEIGHT VALUE OF THE VARIABLE YOU'RE COUNTING ON TO MAKE YOUR EQUATION RETURN THE RESULT YOU STATE. Period.

What we DO know, without any qualifications or additional information needed, is the weight of the stock exhaust components. They've been weighed by numerous people. It's proven. Old news.

We don't know for sure what aftermarket components are on the car is question... but we DO KNOW the weights of a large variety of aftermarket parts... and that these weights indicate that it is perfectly within the relm of possibility to acheive the sort of weight savings that we say it is.

It is also within the realm of possibility that the poster went out and found the singularly most heavy aftermarket components available for each of the three exhaust sections, and thus only acheived a weight savings more similar to what you quote... and subsequently had a quantity of fuel in the car that is toward the low end of the RANGE (you do understand the implications of the range?) that "1/8 tank" could be.

The reality may be somewhere in between. A little bit gas. A little bit parts... but either way, stop talking about equations, because they aren't valid here for any real talk of actual numbers without additional info. The only thing we DO know here is both the potential AND typical weight savings potential of aftermarket exhaust components, which you questioned, and were subsequently shown to be wrong.

 

this htread is funny.