how much does your FC weigh?
 

any one did any weight reduction, like any thing major we can take out from our car to lighten up our rx7 FC. how about a/c and stuff? any idea what can take out that would make a major difference.:icon_tup:

if i am not mistaken you can just search "emissions removal" and pretty much thats what you do. anyone care to help out?

you should really change your subject to what you are actually trying to ask.

Anything that doesn't make the car go, stop or turn is excess weight. Well, maybe not stuff related to safety. An FC with the bare minimum required to drive (on track, no headlights, side windows, etc) and all the right weight reduction tricks will be around 2000lbs.

My '91 N/A, with PS and AC deleted but otherwise mostly stock, weighs 2740 lbs.
with a full tank of gas.
So, figuring the gas weighs around 100lbs., to reach Black91n/a's theoretical target of an even ton you'd have to drop another 600lbs.
That's a lot of stripping.

My stock '91 TII wet, with a quarter tank of gas, weight 1305 KG. Give or take a few KGs... The papers say 1300 KG, so that seems right. When I'm done with the V-Dub and the Beamer I'll take out as much weight I don't need as possible.

Riz.

sorie 4 teh dubble post...

So my FC streetlegal track car that I have in my haed could be in the 1000 KGs? As in 1000-1099 KGs? Wow that would be a awesome achievement! Guess that's gonna be my goal then.

Riz.

1 Kg= 2.2 Lbs., so @2200+ Lbs.
Not sure exactly what "streetlegal" entails but I'd assume lighting and D.O.T. glass, both of which add some weight.

I can see how gutting the interior, 86ing the power windows/seatbelts/sunroof (if you have them) and ditching the dash / stock seats might get you a fairly easy weight loss of around 250Lbs.
Beyond that, it's going to get a lot more expensive and difficult.

91 FC track car, gutted interior, no emissions, 2x alum racing seats, kirk roll bar. 2400 lbs wet. This is probably the lightest I could see getting to while having any hope of remaining street legal.

There is probably 100 lbs of "easy" stuff I can remove/mod (eg. gut doors and glass, remove sunroof, lighter wheels) but some of these things would quickly make it mostly unstreetable)

Taking 400 more lbs off to get it down to 2000 would involve major surgery involving fiberglass and lexan.

-bill

That 2000lb number would only really be possible if you did EVERYTHING possible to reduce weight. That means no interior whatsoever, the lightest fenders, bumpers, hood, seat, etc you can find, gutted doors, lexan windshield and hatch, no side windows, gutting the wiring harness, cutting off excess length on bolts, no rear swaybar, lighter brakes, lighter suspension, lighter flywheel and clutch, lighter wheels and tires, etc, etc, etc. So you can see it's not really a realistic number for 99.999% of people, as that car wouldn't be close to being street legal. Just the absolute bare essentials, and the lightest you can find of all of those.

FP 88fc down to 2000 still got stock hatch full wire in engin bay

I'm with clokker, 91 GXL with spare tire removed, 1/2 tank, 18lb wheels. Wieghed 2720lbs at a truck stop.

I've been meaning to weigh it again with the turbo stuff on.

I don't need glas, lexan will suffice. I dunno about laws over here, but I might have to keep the windshield stock to keep it street legal. Lightest light weight headlights, tailights will be modified or just a panel with a couple of round LED lights. I'm talking about removing everything I don't need I daily drova a Bug for a long time, luxury is overrated. I might have to instal a alarm though for insurance.

I would gut the doors, remove suroof and all that stuff. So, maybe I could lose up to 100KGs more then you, getting me in the range I wanna be.

Would be nice if you guys could post pics of your cars when you are saying the numbers, so we get the idea... I'm not looking for more luxury then a F40... I want it as hardcore as some of those streetlegal race cars I see driving over here. They are like Porsches and Aston DBSs which are completely race ready. They have glass frontshiled and lighting and stuff like that, but other then that they are racecars. I believe manufacturers have to produce a nember of them for the street, so they are allowed to race 'em.

Riz.

I'm curious to see how light my car is now. I once rolled it up on a truck scale before but I don't remember the numbers since it was about 10 years ago. I should have some reduction with a fiberglass hood and front bumper now and all the extra crap removed from the engine

Bad example from Riz. The AM/Porsche factories are doing alot of things to those cars to lighten the hell out of them that most FC owners cant do. For example..... ever try to pick up a completed rear subframe? Any idea how much weight can be lost when using different materials to build it?

I was thinking about that the other day! I would love to see someone experiment with other materials and make a different / better subframe! :D Any ideas of how easy/hard this would be just to try and copy one with aluminum? Would it be possible to convert to a tube rear subframe setup?

Well yes, that is right. I know that, and that's why my car only costs a couple % of what those cars cost.

I was actualy reffering to the luxury and comfort those cars (street leagal track cars) offer. Virtualy none! I don't need to be more comfortable in my FC then in one of those cars. I got other cars for comfort/DD.

Obviusly I wasn't thinking I could compete with those cars, and certainly not with a somewhat realistic budget.

The only reason to keep it registerd is the Nordschleife, and maybe Time-Attack.

Riz.

I can't imagine it would be nearly strong enough if it was merely copied in aluminum.

I think a thin wall chromoly subframe would be the way to go.

Lexan windshield is a no-no on a street car, you can't use your wipers! You'll scratch the shit out of it.

doesn't lexan get milky eventually?

Anythings possible with enough bread tossed at it. Aside from weight savings, what other adjustability can be worked into it that aftermarket parts don't already offer?

The rear diff is the heaviest single piece back there though

Meh, for the extra few pounds, I'll take some creature comforts becuase I'm not competing heavily. Track days and auto-x so I'll sacrifice a little weight and keep my sunroof, power windows/locks etc etc. I did ditch the PS and the A/C only becuase I dislike them anyway. I RARELY use the A/C in my Jeep and it's black with a dark interior. The only time it's really on is in the summer when I have my two dogs in the truck with me

I would agree but as I said above, what are you gaining for all that work except shedding a few pounds and possibly bumping yourself up a few classes.

Hmmmm... would a carbon clutch setup really help much there, or is it mainly the outside metal that is really the heavy part?

The rear diff man, not the clutch. And yeah, in my opinion it's heavy but the trade off is strength. How many FC guys break that casing vs how many FD guys do? I've never heard of an FC case exploding while the FD guys are plauged with that problem @ higher HP levels while dragging. It's a problem to the point where there are a few different companies that offer diff braces and a few forum guys have made thier own.

It's really about what you want the car to do/class that would dictate the setup. Would I like to see a lighter diff, or even a lighter rear end assembly? Sure, but at what cost/benefit.

opps, I meant to say diff. Got mixed up in my head thinking clutch diff. :) Thanks.

Yeah I agree, would suck to have the whole casing explode just to try and same a little weight.

On a drivetrain component I would take extra weight rather than have a weak component. You can always make more power one way or another.

Is the rear diff housing made of aluminum or cast?

I've got three Mark VIII aluminum 8.8 center sections sitting in my garage... they seem like a good choice to swap into anything because of the gearing and diff options, but I wonder if they are lighter or heavier....

On my old GXL, I took out the AC, PS, emissions, cold start, most of the undercarpet mats, jack and spare. I replaced the dual exhaust with a single, installed an aluminum flywheel, race seats, aluminum hood and light wheels. I sold it to a friend, who put it on a dump scale which showed 2420lbs with a 1/4 tank.
BTW, the stock exhaust is HEAVY!! Stock catback was 70lbs. The JIC single we put on was 18lbs. (It was a little loud, though.) :D

granted i havent stripped anything but with the LS2/T56 combo i weighed in at 2800 lbs on the money with gas and full interior,, I was always wondering what rotarys were weighing in at and what was capable. glad i came across this thread so far good info guys

ooops meant LS1 not LS2

continuing this old thread. i weighed my car recently and it was 2920lbs O.O . S4 TII, power windows, sunroof, full interior, a/c, p/s. spare tire removed, 18in wheels (275 35 18 rear), 4inch down pipe, 2.5 rb dual exhaust. big borg warner turbo. full tank of gas. my car is a fatty..
the funny thing is i had an almost perfect 50/50 weight distribution with the back weighing 40lbs more! im assuming a half tank is a perfect 50/50 =D

the lightest FC i've ever seen was 2350lbs with cage, this car had everything, front halfed, FC door skins, CF hood, CF hatch, lexan, 15" 9lb rims, you name it.

my car is currently at 1200kg (2650lbs) with full tank and half cage.

I got to put my car on some scales recently, and since I'm staring at my data page on my pin-board...

91 Vert: 2966

The minus:
Airbag system removal (airbag/computer/battery)
No A/C (evaporator still in dash)
Lightened steel flywheel
Cobra Imola driver's seat
Several interior panels removed
Coilover suspension
Spare tire removed

The plus:
Rollbar with single diagonal
BBS RGII 17*8/9 245/255
Mazdatrix triangulated strut bar.

Corner weights (didn't play, just measured)

LF: 772 RF: 728

LR: 736 RR: 730

My 87 FC started as an automatic base model with manual steering/manual windows/no sunroof/manual mirrors, got 5-sp/5-lug swapped, front strut bar, RB streetable header+presilencer, stock catback [when weighted], Skyline R32 GTS-T wheels, front strut bar [I think it had it at that time..], S5 non adjustable seats, cone air filter with the long part of the snorkel still in place, AC compressor and tubing removed [condenser and underdash pieces were still in place], still had the aluminum 4-lug spare in the back..
and it had ~3.75Gal of gas in the tank when I weighed it]
it came out to 2550LBs on a truck weight station scale. [I was not in the car]

mine is a totally STOCK 1987 GXL with ABS. steel hood, steel spare.

2880 lbs with a full tank of gas, no driver

10ae- 2900 lbs, 3/4 tank of gas, full interior, stereo system. Waste Management scales

88 gxl with 1/2 tank of fuel and no driver was 2700lbs according to the truck scale. this was weighed as i drive it, spare tire, tool kit, bottles of oil and water.

2580lb on a junkyard scale...10ae. most amenities removed...nothing obvious by looking inside the car.

mines weigh over 3200 but i have 18 inch chromes rims(getting my new 16s today) and have 2 kicker L7s in a costum(heavy) box.
But i have considered taking it out but realized that it really wouldnt matter since mines not a track car.
Still thinking of how nimble my near stock 300zx was with just intake and cat back makes me wanna lighten her up some.

16"s..Aluminum hood... no ac ps or air pump... no rear bins.. base model... when I weighed it it had quarter tank door panels and. Carpet...

2425
Lf 659
Lr572
652rf
542rr
Cross 50.5%

Now I have no carpet ,no door panels ,no headliner, no interior plastics..I added a fire extingusher
And Love it!!!! I don't have any other numbers but in guessing 2,350.

Sorry double post

i pulled the spare and put an AL hood on mine for a while, it didn't make it to the scale, but i imagine it lost 50+ pounds, and i could tell

haha I forgot about this thread. I've weighed my car and it was 2680 with a half a tank of gas

1986 sport model

yea i think i just lost like 100lbs changing from 18inch chrome fat tires to enkei 16s,
and another 100 losing parts and pieces i didnt need inside the cabin such and coolant and spare oil, and spare tire, havent drove it yet but it looks sexy now

just drove it.. wow biggest difference ive felt in a long time. so nimble and quick

See my post above :nod:

I had some weight reduction done to my 10th AE and it went from 2710 when i purchased it to 2525 at the last weigh-in at the track.

Removed all:
PS system (hoses, bracket).
All AC system (hoses, condensor).
All cruise control system.
All heater system (hoses, blower, vent ducting).
All stock sound system (all speakers, head unit).
Front and rear bumbers under bumber facia.
Four metal "tie-downs" and bolts under car.
Stock flywheel replaced with ACT lightweight.
All exhaust system replaced with RB downpipe.
Spare/Jack.
Removed padding under carpet and replaced carpet.


Other little things here and there.

I have an 88 gxl with ps and ac delete. No carpet at all. No storage bins. Converted to manual windows and mirriors. Have an alluminum hood.When I weighed my car the ac and heater stuff was still under the dash. It weighed in at 2510 with half a tank of gas without me in it with my backpack and books in the hatch. Since then, I've gutted behind the dash, ditched the door panals and center console, converted to side draft carbs which ditches the heavy intake manifold and running msd blaster coils which are lighter than the stock coils. I changed to lighter wheels not sure of weight. I ditched the rear wiper. I'm planning to weigh it again. I know I've easily ditched over a hundred pounds since the last weigh in. I'm shooting for around 2350 with half a tank before I invest in a carbon hood and fiberglass fenders. I'm planning an all motor pp build with rx8 rotating assymbly. I picked up a 8lbs fidanza flywheel but not installed yet. Thas gonna shave 16 lbs off by itself. I'm also planning to pick up a mazdatrix alluminum driveshaft, that'll save an additional 7-8 lbs. My car is still street legal with the working sunroof.I'm going to be adding some weight back unfortinatly, I'm changine to true dual exhaust with two presilencers and mufflers to try to keep the pp on the street. It'll be a few weeks or so but I'll Let you guys know the new weigh in numbers once I make it back to the scales. I'll still be running the single exhaust still. I'm expecting under 2400lbs with half a tank.

Scaled mine at 2499lbs with around 1/3 tank of gas and me not in it. Car is a 90 GXL s4 t2 swap. Most everything is gone thats easy to remove. It would be lighter but has bed liner sprayed through out the engine bay and undercarriage.

Attachment 709068
Attachment 709069

supposedly bedliner is lighter than the equivalent coating of paint (primer, base, clear, everything)

of course you'd have to have stripped down to bare steel before lining it to have the savings

2325 lbs, with full race cage, full stock metal body work (aluminum hood), full stock glass. Almost empty on fuel.

17" wheels

S5 non-turbo

Stripped just about everything else out.

Weighs almost 600lbs less than my mostly stock turboII (ABS removed only)

88 base model with an aluminum hood, A/C and P/S removed, no emissions, full interior (but some sound deadening and mats underneath carpet removed), Odyssey PC680 in passenger's bin, no speakers or sound system, other misc removals = 2380 lbs with somewhere between 1/4 - 1/2 tank of gas and no driver.

87 TII with A/C / P/S removed, no emissions, full interior (not as much removed yet as on the '88), no speakers or sound system, Odyssey PC925 in passenger's bin = 2630 lbs with somewhere between 1/4 - 1/2 tank of gas and no driver.

Both weighed in at a rock quarry, one after the other. I'm just muy aggressive with the removals or the scale was a bit wacky, something.