Let's talk weight - RX7Club.com - Mazda RX7 Forum

Let's talk weight

Old 05-13-14, 12:36 PM
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Let's talk weight

There's a lot of heated talk all around the internet about how much weight the V8 adds. Some people say as much as 200lbs. I can. So, I was wondering if the people that have weighed their cars ( any generation 7 ) could chime in here and say their current weight, the current set up they're running, and if possible, how much their car weighed pre swap. Thanks.
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Old 05-13-14, 08:40 PM
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You're asking the wrong question. Anything you can change/take off/add with a swap you can do without a swap. This is why people talk about how much an individual part weighs and compare them.
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Old 05-14-14, 10:40 AM
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Old 05-14-14, 11:05 AM
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The LS swap weighs more mostly because of the t56 transmission, which is low and in the center of the car.

My FC handles about the same with the LS1 in it. I had an NA in my FC and needed a couple suspension adjustments for the extra power. My car is a partially gutted track car, and is around 2650-2700 lbs.
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Old 05-14-14, 11:06 AM
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Originally Posted by valley View Post
You're asking the wrong question. Anything you can change/take off/add with a swap you can do without a swap. This is why people talk about how much an individual part weighs and compare them.
Thanks for the reply. I understand. I was just hoping to to get some figures to show averages/examples of what people ended up with after swaps. There are people that say it adds 200lbs and such and I know for a fact that with an FD that's not the case. I don't know about previous generations though.
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Old 05-14-14, 11:07 AM
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Originally Posted by Littleguy View Post
This is very straight forward. Thank you!
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Old 05-14-14, 11:23 AM
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Originally Posted by Vader View Post
Thanks for the reply. I understand. I was just hoping to to get some figures to show averages/examples of what people ended up with after swaps. There are people that say it adds 200lbs and such and I know for a fact that with an FD that's not the case. I don't know about previous generations though.

It might add 200 lbs in a NA FC, especially considering most add T2 rear ends. That is 40 lbs right there. My S4 NA FC was ~2550 before the swap. I am under 2700 now and partially gutted with a roll bar.
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Old 09-14-14, 10:03 AM
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This is not really an apples to apples comparison as I found out a bunch of years ago when I thought I could get my swap weight down to what my ITS cars weighed. The weight of the engine and trans is not really the issue. As soon as you start adding bigger wheels/tires, bigger brakes, dual exhaust, etc., the weight starts adding up. My swap weighed 2766 w/out driver and had both front seats, door glass, dash. ITS car weighed in at 2680 with driver. ITS wheels weigh 9-12 #'s each (15") and uses stock brakes. My swap had 17"wheels that weighed around 20# each and I run 13 1/8" front rotors and 11 1/2 rears. Extra seat weighs around 38# and as you can see it all adds up. Bottom line, the car handles like and RX7 with a ton of torque. I run a big front bar and no rear bar and prefer a square wheel/tire setup. Running staggered might require running a rear bar depending on driver preference and I've played with different sizing on our NASA car which runs 285 fronts and 315 rears.
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Old 09-14-14, 11:14 AM
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95 ls3 fd
no ps or ac
stoptech bbk
03 cobra rearend
lizard skinned interior
enkei rpf1's 9.5 all around

weighed 2765 with a little under half a tank
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Old 09-22-14, 07:02 PM
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94 Full interior
All accessories in working order
LS1/T-56
Battery moved to rear
80+lb of stereo in the back
WAAAYYY too much dynamat
18x10 CCW's all round
3030lb with a full tank on a semi truck scale who knows how accurate :-(
Slightly rear biased with stereo. About 49.2/50.8 Should be about 50/50 without it.
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Old 09-28-14, 02:55 PM
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Mine weighed 2780 lb. with 1/8th tank of fuel before engine swap, 2800 with 1/8th tank after LS2/T56 swap, but before bigger wheels/tires/brakes, roll bar, A/C, p/s, and Accusump.

With ~50 lb roll bar, 17x8.5 17x9.5 TE37s with 255/40-17 265/40-17 Z1 Starspecs (heavy tires!), A/C, p/s, battery in bin behind passenger seat, 8.8" Cobra diff, full interior, buncha Dynamat, main and sub amps between rear shock towers (sub removed), ~25 lb of Accusump in the spare tire well, with 3/4-tank or ~15 gallons:
total = 2949 lb (should be ~2855 lb empty)
front = 745L + 742R = 1487 (50.4%)
rear = 724L + 738R = 1462 (49.6%)

With me in it and 3/4-tank:
total = 3114 lb
front = 795L + 759R = 1554 (49.9%)
rear = 796L + 764R = 1560 (50.1%)
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Old 11-12-14, 02:29 PM
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LargeOrangeFont said it. Most of the weight is in the t56 transmission. The thing is huge, but it sits low in the middle of the car. My 88 tii ls1 fc sit's at 2890 with full interior, huge battery, and ps pump.

Last edited by nemotoad; 11-12-14 at 02:31 PM. Reason: added weight specs
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Old 11-18-14, 02:44 PM
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50/50 for the win

Originally Posted by Exidous View Post
94 Full interior
All accessories in working order
LS1/T-56
Battery moved to rear
80+lb of stereo in the back
WAAAYYY too much dynamat
18x10 CCW's all round
3030lb with a full tank on a semi truck scale who knows how accurate :-(
Slightly rear biased with stereo. About 49.2/50.8 Should be about 50/50 without it.
I have a similar setup with an LS2, Its amazing how its still anywhere close to 50/50!
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Old 11-24-14, 11:17 AM
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It's very hard to get exact numbers since most change other things.

I can tell you my '88 TII with an aluminum block 5.7 + turbo kit + T56 + full interior (heat/power everything, sound deadening, stereo, etc) weighed 2806 lbs on calibrated corner scales. 51.9/48.1 F/R weight balance.
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Old 11-26-14, 12:45 PM
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94 stock LS3/T56 with PS and A/C. Full interior/stock leather seats and roll bar.
Sunroof etc. with me in the car and half tank of fuel. Accurate corner balanced and cross balanced/aligned.

3219 lbs (with driver) 2980lbs without driver
Front 50.7%
Rear 49.3%

Cross weights within 1 lb.

Also the car ran 0-60 on the Vbox in 3.8 second with as you can see a slow 1-2 shift and street tires!
Not bad for ruining the balance of the car with an LS Swap lol

The car with N/A power is so much more linear and easy to modulate the power and makes it a joy to drive.
The cars are a lot of work to make right so don't go into it like its a breeze. There are always things that can be improved on the refinement of the swaps but the trail has been blazed and they are now working on retrofitting the stock FD power steering pump on the LS front accessories. Plus all the Subframes are nicely worked out with the Samberg parts.

I sold my car but for a guy who turns all his own wrenches it's a great swap. If you pay someone to do the work plan on it getting expensive fast.

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Old 11-27-14, 10:33 PM
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Wet weight with spare tire and tools etc is 1260 for my car
Cross weight 2kg difference 50.2/ 49.8 including the rollcage
I didnt spend much time with the scales.. it should easily go 50/50

Been thinking to bring the weight down another 100 150lb with carbon doors and hatch but im affraid i will lose the comfort because its still a daily car
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Old 11-28-14, 04:17 PM
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I didnt realize it was for v8 swaps. Sorry
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Old 11-28-14, 04:58 PM
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Originally Posted by R-R-Rx7 View Post
I didnt realize it was for v8 swaps. Sorry
Well, now that you posted in this section you are obligated to V8 swap your car! hahahahaha
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Old 11-28-14, 07:27 PM
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Im actually very happy with my 13b... you might have to switch back to 13b and save some weight
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Old 12-05-14, 02:51 AM
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my LS7 FD with a full tank of fuel, 3 gallon dry sump tank, no passenger bins or rear carpet/spare/tools, dual 3" to 3.5" exhaust with cats and heavy muffler, odesey 26lb battery in driver side bin, widebody kit with 315 front/335 rear (very heavy tires), T56, cobra 8.8" diff, full sound deadening, Touring model with sunroof (rear Bose removed) was 2840lbs. no a/c with factory R1 seats. Put on the scale 49.5% front/50.5% rear

there is a stock body FD with ls/t56 power, stock rear, setup for autocross and is totally gutted.... it is 2553lbs and full tank of fuel. http://www.norotors.com/index.php?topic=14851.60
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Old 09-04-15, 05:25 PM
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I came in at 3077 with me in the car (150 lbs) and a full tank of gas. 49.9%/50.1% front/rear.
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Old 09-04-15, 08:23 PM
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My FC is 2908 with me in it and full of fuel. 51.8% on the front wheels. Its right at 2600 with no fuel.
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Old 05-30-18, 09:39 PM
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still much lighter than newer cars.
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Old 06-03-18, 02:26 AM
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Mine weighed in at a hair under 2800 before I gained 50 pounds with a full tank.
93 base ls6 t56
fiberglass fenders
Fiberglass hood
Aftermarket bumper
No stereo or components
no ac or ps
Turbo II led
18x9,18x10 forgestars
No spare or any hatch interior
gonna grab some scales from work and try again, seems like those scales read about 25-30 lbs per axle low just off what I'm seeing here.
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Old 06-03-18, 02:28 AM
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Ive heard in a FC, LS1 weighs 100lbs more than a 13bt, aftermarket turbo with a FMIC setup.
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