Official Turbo Weight Loss Thread/ Lightest Turbo List
 

Want to trim some weight off of your turbo? You arent alone. This thread is for detailed inputs on weight reduction for the 996 Twin Turbo. Please no guesstimates or they wont be added to the list.

WHY IS WEIGHT LOSS IMPORTANT?!?!?!?!?!?!
Ive been wondering how weight loss translates in terms of hp so I did some rough calculations that might be interesting to you all. If you assume a 3500 lb car with 500 hp, each 100 lbs of weight loss translates to this amount of power. Math experts please correct me if im wrong.

Weight....actual HP.........lbs/hp.............relative power
3500.......500.................7.0................ .500
3400.......500.................6.8................ .514.7
3300.......500.................6.6................ .530.3
3200.......500.................6.4................ .546.9
3100.......500.................6.2................ .564.5
3000.......500.................6.0................ .583.3

So a 300lb weight loss is the equivalent of adding 47 hp if my calculations are correct. Interesting to note that going from 3500 to 3400 is only equivalent to 14.7 hp and going from 3100 to 3000 is equivalent to gaining 18.8 hp. It would be interesting to make tables like this for cars with 600hp and 700 hp and so on. (rwm514)

Requirements for being included in the weight loss thread. #1 Replacement Part #2 Brand of said part i.e. GT3 Recaro seats, GTR Brembo BBK #3 Actual weight difference between both parts, weight lost by installing new part or the weight of the new part itself.

This method will allow us to eliminate some of the guess work for those of us trying to trim some weight.

More discussion on the topic of weight reduction for the 996 TT here https://www.6speedonline.com/forums/...ad.php?t=70932


Battery: Stock - 52 lbs
Odyssey PC680 14.99 lbs (Sallymobile)
Odyssey PC925 26.0 lbs (Sallymobile)
Odyssey PC1200 38.2 lbs (Sallymobile)
Optima Red Top battery = 39.4lbs (jimmer23)

Spare Tire and Tools Removal:
- 39.2 lbs (Al Norton)

Wiper Delete:
-3.8 lbs (Al Norton)

RWD Conversion:
-Differential, drive shaft, both axles - 68-71 lbs (rwm524 )
-Front differential 52.0 lbs. Driveshaft 6 lbs, 10 oz. Half shafts 12 lbs. 2 oz. the pair. -Total for removing these items -71.0 lbs. (Al Norton)

Brakes:
-Brembo 14" kit w/ 6-piston caliper (fronts only)
-OEM caliper weighs 10.1lbs vs. Brembo caliper weighs 7.8lbs
-OEM disc weighs 23.4lbs vs. Brembo disc weighs 16.9lbs - 17.6 lbs total

-Rotora 355 mm rotors with 6 piston fronts and 4 pistons rears... rotors 17LBS, 6 piston calipers 7 lbs., 4 piston rears 6 lbs
-19 lbs lost in front
- lbs lost in rear (MARKSKI)

Seats:
-Stock Sport Seats- 46 lbs EACH
-Rear Seat Removal - 22.1 lbs (Al Norton)
-GT3 Seats - 58 lbs (Al Norton)


Clutch/Flywheel Items:
-Stock clutch/pressure plate/disc/flywheel - 46 lbs (Al Norton)
-Sachs clutch, pp and 964 flywheel weighs 28 lbs. (Al Norton)
-Clutch Actuator - 7 lbs (cjv)
-LWFW and Sachs Pressure PLate - 19 lbs (rwm 514)

Exhaust Items:
-Stock Exhaust : 57.6lbs
-996 Twin Turbo Sports Imported Racing Catalytic Converters with Muffler Bypass -Pipes -50lbs (f1crazydriver)
-Tubi Style exhaust(first gen) : 35.2lbs (TXGold)
-AWE Straight Pipes (7.5 lbs each) Heavychevy
-PSI Loud ~38 lbs Heavychevy
-AE Performance 996TT/GT2 exhaust (no cats): 26 lb Mr. White


Other Interior:
-Subwoofer Removal - 12.2 lbs (Al Norton)
-AC condensers, compresser 22.1 lbs (Al Norton)
-Door Speakers 18 lbs (pair) (Al Norton)
-Dash/Rear Speakers (1.5 lbs each) (Al Norton)
-Sunroof - TBD (Tom Kerr)
-All interior Carpet and Seatbelts TBD (Tom Kerr)
-Passenger front air bag removal 10lbs (Tom Kerr)
-Side Air Bags 5 lbs (One Love)
-Complete Interior Carpet approximately 52 lbs
-Shaved Interior Carpet 11 lbs

Body Parts:
-Bumper Supports -Front bumper support and all hardware 14.2
-Rear bumper support, rear heatshield, and all hardware 21.4 (TXGold)
-Getty Design
- CF Roof (no interior) 8lbs (stock w/ sunroof ~47 lbs with interior)
- FRP Roof (no interior) 10 lbs

- CF Hood 12 lbs (stock hood 40 lbs)
- FRP Hood 15 lbs
-Doors TBD (Tom Kerr)
-Stock hood 40lbs. Carbon Fiber Hood 16lbs. (luckyluke)
-Custom carbon hood 5lbs. 35lb savings. (luckyluke)
-Spoiler/Deck Lid & Carbon Fiber Roof - 35 lbs (luckyluke)
-Techart Wing, removal of wing motor mechanism - 30-35 lbs (DMK)
-Rear Bumperrettes - 2 lbs 7 oz for the pair (Al Norton)
-Misha GT2 Replica 30 lbs Stock Decklid 36 lbs (heavychevy)

Wheels: (hollows listed twice)
Factory 996 Turbo Hollows
8x18" at 22 lbs 2oz
11x18" at 26 lbs 5 oz

Factory 996 Turbo Solids
8x18" at 26 lbs 2 oz
11x18" at 31 lbs 6 oz

Factory GT2 wheels uses Turbo solids in wider spec:
8.5x18" at 28lbs 11 oz
12x18" at 33 lbs 0 oz

Factory GT3 wheels
8x18" 22 lbs 10 oz.
11x18" 27 lbs. 11 oz.

Factory GT2 wheels (later years, GT3 style)
8.5x18" 25 lbs. 2 oz.
12x18" 29 lbs.

Turbo II Hollow Spoke (BBS)
18x8 offset 50 996.362.136.04 21.27 lbs
18x11 offset 45 996.362.142.03 26.23 lbs
18x11 offset 45 996.362.142.11 26.23 lbs

Turbo I Hollow Spoke
18x7.5 offset 993.362.134.05 18.96 lbs
18x8 offset 993.362.136.00 19.62 lbs
18x10 offset 993.362.140.00 25.13 lbs
18x10 offset 993.362.140.01 23.37 lbs
18x10 offset 993.362.140.01A 23.94 lbs

Turbo Look II (BBS)
18x8 offset 50 996.362.136.01 26.23 lbs
18x11 offset 45 996.362.142.01 31.96 lbs
18x12 offset 45 996.362.142.31 32.4 lbs

AFTERMARKET WHEELS

-BBS E88 race wheels
18x9 18.8lbs
18x12 19.4lbs

-BBS RS-GT
18x8 20.6 lbs
18x11 24.5 lbs


-19" Dymags for 997S
16 lbs., 0 oz. front
19 lbs., 0 oz. rear

-Fiske Profil 13:
8.5X18 = 21 lbs.
12X18 = 22.5 lbs


Tires:
Pirelli P Zero Nero Stock sizes front 23.14 lbs rear 27.11 lbs

Nitto NT-01 245/40ZR18 is 25.35 lbs. 315/30ZR18 is 29.98 lbs (AL Norton)

Continental Sport Contact 2 Stock Sizes front 23.14 lbs rear 25.35 lbs

Toyo Proxes R888
225/40 18 22.7 lbs
235/40 18 24.69 lbs
265/35 18 26.23 lbs

Yokohama Advan A048
225/40 18 22.92 lbs

Kumho Ecsta V70 A
225/40 18 22.92 lbs

SAFETY EQUIPMENT:

These are not reductions, but will let you know about how much weight you will add back with safety equipment.

GMG Roll Bar - 45 lbs
Tequipment Full Bar - 28 lbs
Tequipment half bar - 10-15lbs

Lightest Turbo List:

Stock- 3495 lbs

Weights included are with 1/4 tank of gas averaged in or used on the scale.

Tom Kerr -

- 2500 gutted, no cage, no dash, no doors
- 2700 w/ cage only
- TBD finished product.

CJV - 2995 (-500 lbs)
-TBD

3) Markski 3150 (- 345 lbs)-
-interior all gone except roof lining
-GT3 seats.
-no fron nor rear bumpers nor bumper supports.
-techart fron spoiler, side skirts,
-Gembella rear wing,
-small battery,
-Rear Wheel Drive.
-HOWEVER, I have huge GT35r turbos and wastegates, very heavy axles, big intercoolers, but lighter exhaust.

wirx 3175 (- 320 lbs)
-Removed spare and tools,
-removed rear seats,
-floor mats,
-straight pipes,
-removed NOS bottle,
-removed hood inside carpets,
-smaller battery, (22lbs),
-RWD,
-1 race seat,
-lighter decklid

Heavychevy 3175 (- 320 lbs)-
-Removed spare and tools,
-removed rear seats, floor mats,
-AWE straight pipes,
-One Corbeau Racing seat,
-964 RS LWFW,
-GMG roll bar,
-oddessey PC80 Battery,
-misha GT2 decklid and wing,
-wiper delete
-radio delete
-rear seatbelts delete
-cupholder delete


TXGold 3188 (- 307 lbs)
-RWD Conversion;
-Mats, Spare, and Tools;
-Wiper Delete;
-Rear Seat Removal;
-Subwoofer Removal;
-LWFW;
-Straight Pipes with Cats;
-Rear and Front Bumper support removal


rwm514 3192 (- 303 lbs)
-RWD conversion,
-LWFW,
-Fabspeed exhaust,
-spare and tools removed,
-floormats and manual removed,
-GT3 seats,
-rear seat removal

F1crazydriver (3210)
-TBD

PV996TT 3216 (- 279 lbs)
-no spare,
-no rear seats,
-smaller battery,
-brakes,
-BBS wheels,
-carbon fiber doors and hood,
-RUF front,
-GT2 deck/lid problably the same weight as standard,
-carbon fiber GT3 seats,
-Öhlins suspension,
-titanium rods,
-inconel headers,
-RUF steering wheel,
-RUF intake,
-Sportec carbon fiber airbox.
-Added weight: RUF Integrated Roll Cage, harness, oilcooler for gearbox, aluminium pedals.

jcb-memphis 3223 (- 268 lbs)
-aero front lip, cf front winglets
-Porsche Motorsports 996 RSR carbon rear wing,
-switzer exhaust,
-dynamat sound proofing put in and oem stuff moved out by the prior owner (a stereo junkie....),
-full rear,
- one Britax booster seat,
-JIC cross suspension (and full suspension from Dan at Vivid),
-GT3 Carbon Fiber Seats (custom color) (from Ray of ROTtec),
-H&R front and rear sways, ap control arms, ap front and rear links (Dan),
-stock rear wiper still in place, cg locks, turbo twists with sumitomo htr z III tires in 225/295 (tire rack)
-lightweight battery and aluminum racing bracket (rat racing)

BlackHorseTurbo 3240
With the following in place:
2 Rottec CGT seats (recline able 28lbs each)
1 Agency Power roll bar with cross brace (44lbs)
Status 5 point harness (8lbs)
1 Fire extinguisher
1 red top Optima battery (25lbs)
HRE 18" C20r wheels
Brembo GT-r Brakes and rotors
Straight Pipes (15lbs)
Front floor mats

With the following removed:
Stock seats
rear seats (belts in place still)
Spare tire and tools removed
Front drive and drive shaft
Rear Wiper
Rear wing motors

onelove 3246 (- 249 lbs) (TBD)



Silvershark 3282 ( - 209 lbs)
-Removed spare tire and tools,
-Lighter battery 26lb.,
-Kinesis F110 wheels (F) 19x8.5 17lbs (R) 19x11.5 20lbs each
-Michellen PS2 tires,
-LWFW,
-Europipe loud exhaust,
-Sachs P-plate ceramic disc ,
-Rear wiper delete,
-Corbeau A4 seats 25lbs each
-Removed rear seats,seat belts, hardware and foam rubber insulation

Contigo 3284 ( - 207 lbs) -
-Removed rear seats completelly plus seats belts,
-took off insulation of all the rear seats,
-changed front seats to GT3 seats CF,
-removed front and rear bumpers,
-AWE straight pipes,
-Gemballa racing wheels and Michelin PS2 tires rim 19,
-Rear wipper delette,
-CF hood,
-Rear Gemballa spoiler and GT2 CF wing,
-no spare, no tools,
-nothing in front empty,
-brembo GT brakes 8 piston and 380 mm floating rotors,
-bumperettes delette

Steve Theodore - 3320 (- 175 lbs)
-removed upper back seats,
-removed rear bumper,
-removed rear wing hydraulics,
-rear wiper/wiper motor delete,
-custom stock (de-catted) exhaust,
-removed spare tire and rest of junk from trunk,
-Fikse Profil 13 wheels,
-half tank of gas

Whirls 3347 (- 148 lbs)
-TechArt Type II body kit,
-GT3 Seats, rear seats removed,
-RUF 18" 3 piece wheels,
-Porsche roll bar

DrewTT 3350 (- 145 lbs)
-removed back seats,
-rear wiper delete,
-sport seats,
-tubi exhaust,
- removed spare tire and rest of junk from trunk
-quarter tank of gas.

Mikelly 3360 (- 135 lbs)
- GT2 rear wing/wiper delete,
- removal of front bumper stops/hardware,
-GT3 seats,
-DGI Exhaust (superlight weight),
-PSS9 Coil overs,
-and no tool kit

SEVE KOJASEVIC-3430 (-65 lbs)
-lbs rwd full tank of gas full interior ,
-sport seats (semi powered)
-heavy OEM 19" carrera wheels

STOCK WEIGHT Manual - 3495 lbs (may vary depending on options Sunroof, Sport Seats, Hollows)
Tiptronic - ??????


From pg 17

Wing motor and other parts conversion to stationary wing I believe was 30 - 35lbs

Optima Red Top battery = 39.4lbs

Which wing, the same as yours? Please Specify.

Heavyc,

A more correct figure for rear wiper would be 3.8 lbs. according to my measurement of 3 lb. 13.5 oz.

Sorry Techart.

Thanks

You too Al.

Good stuff, guys. Keep the great info coming.

I think I should stand corrected on the rear wiper, take off my 7 pounds must have had other junk in my hands, the other number sounds better.

Rear seats out they are light and dont know but 5-10 pounds max.

What, specifically, must you remove from the wiper delete to drop over 3 pounds? I assume it is more than just the rear wiper arm and blade. If so, what do you do to fill the hole?

You will remove the motor assembly also. It involves popping out that rear vertical panel and you will need a 13mm socket to get the wiper blade off and 10mm socket to remove the inside bolts. Erik the plug guy, found on this forum, can supply a plug for under $30.

I'm gonna weigh my car this weekend when I take it to the drag strip. I will be able to hold the #1 spot on the lightest turbo list until someone with some real weight loss posts up. MUHAHAHHAHAHAAH

Thanks Al. So how does it look with a plug in place of the uncomfortable looking rear wiper. And do I even want to know how Eric the plug guy got his name?

Bumper supports aprox 20lbs per

Plug looks great. Perfect match to my Arctic Silver. I expect a perfect match will also occur with your color.

Don't Know how the name came to be, but the service is stellar.

How many are there total.

1 front & 1 rear

Yup 1 front 1 Rear only good for 5mph anyway. If I am goin to crash prob going to be at 100mph +++

Looks like I'll have more stuff for Neil to do next time my car goes to the shop then. I think I'm going to go:

Odyssey PC925 -26.0 lbs
Spare Tire etc -39.2 lbs
RWD (extreme version) -120 lbs LOL wishfully
Clutch Actuator -47 lbs approx
LWFW Pressure Plate -19 lbs
Exhaust Mod - 50 lbs think i have something similar already
Bumper Supports -40 lbs
Wheels - 20 lbs
GT3 Seats - 35 lbs

396 lbs

So ahem, Neil, next time I bring my car to your shop it should leave about 400 lbs lighter. :D

WOW, that would be a tremendous change in the car.
The things I am not sure of on there is the actuator so please let us know details of that.
Also I looked into the bumper supports also. Front seem do-able rears seem like you will loose the bumperettes? So again let us know how this goes!

Great post, thanks
tom

Yeah it's a long shot and may take a year to do and when I add a Techquipement rollbar it will add some weight back. I also dont want to lose my bumperettes. I guess realitically I'll be closer to losing about 300 lbs which should still be a pretty good weight loss. I'll have my car weighed on saturday and know where I'm starting from. I have a lighter battery, not sure how much, exhaust and no cats already but still have the heavy as a rock techarts on the car so I'll know what needs work after saturday.

Hi D.

Tnx for the hospitality. Bro, you are getting in deeper and deeper------- :-) The dark side is assailing.

this weight thing is really what separates this car from a true track weapon. It is IMHO one of if not the only thing the GT3 (996 stock) has over this car.

I am glad to see you as I are willing to stick with this car and make it what it really is capable of being and doing......

No problem, I need to to teach me some mechanical traits, because I have none. Did you try the wheel cleaner in the 26 degree weather?
hilarious



I agree, and the advantage the turbo has is that it can go on a diet, but the GT3 cant add all that much power, which was my sole reason for getting the TT. I think it can get down to 3100 lbs without major construction and I'll take 3100 lbs with huge modability anyday.

Heavyc,

Have not tried cleaner yet. Waiting for some nicer wx. Expect I should roll it out into the driveway or I would make a mess on the garage floor.
I'll be glad to share all my ancient Knowledge with you. The first thing we need to do to get some weight out of your car is lighten the valve train by getting rid of those heavy push rods. :-)

Not sure about GT 3 seats, but the weight savings may be 35 lbs. per seat. I'll tell you in a few weeks, months, whatever, when Neil swaps them out for my stock heated, memory ones.

EXACTLY my reason for the turbo!! and my plans also.
Also I hate loosing drag races to cars on long back straights, especially if it would be to a corvette or GT3, THAT was why I went with the turbo, HORSEPOWER, and the ability to make it into what I need.

i love my gt3:D . yall can keep your turbos with all the mods and weight saving projects. thats just more money spent for you and more driving time for me while your cars are in the shop.:p

dez, i love driving your turbo;)

LOL dont start none, wont be none up in here. Your car will be in the shop for some mods soon too, dont even act like it wont. :p Parked right next to mine. Well maybe not, we may have to stagger appointments so we can drop each other off. And hey if my car is at the shop I'll be in your garage real fast. In fact I thought about taking the CLS for a spin when I was over there the other day but couldnt find the key, you had better beleive if that M6 or GT3 was in the garage it was going for a ride.

Nitto NT-01 245/40ZR18 is 25.35 lbs. 315/30ZR18 is 29.98 lbs.

Stock hood 40lbs. Carbon Fiber Hood 16lbs. My custom made carbon hood 5lbs. 35lb savings. Doing some weighing and will add more posts soon.

Thanks for the info guys, updated.

Any Information regarding the weight of the front fenders ? Would there be any benefit from changing them to CarbonFiber or Carbon/Kevlar ?

Actual weight for the "lightest car" is not without its compications. The biggest variable will be the scales used for weighing. Recent calibration? Sensitive to light- weight cars or tractor-trailer rigs. I have seen a lot of variation from drag strip to drag strip as to the weight of some of my former racers. It's sort of first cousin to the engine and chassis dyno problems (variations from manufacturer to manufacturer).

One thing that could be eliminated as a variable would be to have everyone weigh with a full tank of fuel. This won't make the drag racers happy, but to use a subjective guess as to how much fuel is in the car introduces inconsistency. Gasoline has an approximate weight (subject to varying circumstances) of 6.25 lbs./gal.

Should we make a requirement of a full tank of fuel for the posted weight? Only way to eliminate that particular variable IMHO.

Down at a DE at PIR yesterday and got a chance to get on the scales. With me and my helmet on board and just over half a tank of gas we weighed 3460

gas =6.5 x 6 gallons= 39 lbs
Helmet= 4 lbs
me= 165 lbs

So the total car weight works out to 3252

Lightening includes...
RWD conversion
LWFW
Fabspeed exhaust
spare and tools removed
floormats and manual removed

I have the standard power seats with rears, + sunroof

I was pretty happy to already be this light. The Clubsport seats might get me below 3200:)

I removed the rear seats today and took the driveshaft seat belt latches off also. Total weight for seats and associated hardware was 22.1 lbs. I took several pictures during the process and will eventually post a how-to, if anyone is interested. I came up with some ways to lessen the harshness of the remaining holes without resorting to the Porsche rear seat removal kit. I am going to attempt to post a couple of pictures of the finished product.

I have no idea if you can enlarge these things or not.

In preview mode it is opening Photo Bucket and enlarging it there, so I have no idea what it will do when I post this.

http://s141.photobucket.com/albums/r...ateralShot.jpg



http://s141.photobucket.com/albums/r...WellMedial.jpg


http://s141.photobucket.com/albums/r...ellLateral.jpg

Cant wait for the DIY, thx! + rep coming:)

You must spread some Reputation around before giving it to Al Norton again.

While in the process of removing the rear seats today, I had need to loosen the Bose sub woofer box so that I could hide the shoulder harness male fittings. I just went ahead and took the whole thing out and weighed it for those of you who hate the Bose system anyway and don't care about a lot of bass. I disconnected it and it was totally inadequate for me without it. Some may find it OK but being a bassist and guitarist , using the terms loosely, I would not be happy without it.

Total weight savings would be 12.2 lbs. BTW the box is designed to fire downward into a carpet underlayment, but the pulse waves off the back side of the speaker cone channel through a bass reflex type of porting system to come out through the two little holes on the front of the box. If the box is removed, there is nice carpeting underneath, and it actually looks just fine without the cabinet in place.

I dont think many people who weigh at a drag station would be willing to fill up before racing and for me I dont know anywhere else to do so. There is no way to tell what scale is accurate and which is a few lbs off. I dont know how accurate trucker scales are but if they are that innacurate then they can be excluded.

+1 on the DIY, cant wait for that.

So you are saying that with the subwoofer removal + rear seat removal will net 34lbs, that is something to consider.

Wait so how do you know how many gallons of gas you have in the car?

maybe we should just footnote what the gas gauge reads at time
of weighing??

MK