**PLEASE STICKY**

I know there is a thread already with the stock Rx-8 part weights but I thought it would be great if we had a section/list of proven weight reduction parts/techniques.

Note: Please only post if you actually weighed (or have the weights from a website) the parts/car before and after. I want this to be similar to the stock Rx8 parts thread with a list of things that can be done to the Rx-8 to reduce weight(Including custome work and techniques).

I think TeamRx8 would be one of the best guys to contribute so if your reading PLEASE help out.

Layout...

- Mod ------------------------ Weight Reduction ----- How to Explaination/Type of Reduction

Engine bay and Drive train:

- Braile Battery - 22 lbs removed - This is assuming stock car has 37lb battery and Braile battery is the 15 lb'er.
- ACT prolite flywheel - 3.5 lbs removed - Rotational Mass
- Fidanza flywheel - 4.8 lbs removed - Rotational Mass Good Win Racing
- Racing Beat flywheel - 4.8 lbs removed - Rotational Mass Racing Beat
- Racing Beat Race Muffler - 13.5 lbs removed - Mufler (17.5 lbs) + Connecting-pipe (8 lbs) = 25.5 lbs...Stock weight 39lbs
Note: I am sure this does not include the CAT.
- Mazda Speed Exhaust - 6lbs removed - Stock = 39lbs
- Corksport exhaust - 9.5lbs removed - Stock = 29.5 lbs
- Borla exhaust - 8lbs removed - Stock = 31.0 lbs
- TeamRx-8 Port back Exhaust (Custom) - 53lbs removed - This includes the header and exhaust. Stock = 79lbs Exhaust Build Info Link
- Stock air condition delete - 18lbs removed - Includes hoses, compresor, etc.
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Exterior and interior:

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Suspension:

- Enkie RPF1 wheels - 7.8 lbs per wheel less...Total 31.2 lbs Unsprung Mass.
- Racing Brake BBK (Front) - 24lbs removed from front end - Includes rotors, calipers, mounting hardware, and pads Unsprung Mass. Link to website and pics.
- Racing Brake BBK (Rear Rotors only) - 6lbs removed - If the caliper weights for the front are any indication much more weight can be saved with rear calipers Unsprung Mass. Link for rear rotors
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I will try to keep everything posted on this first page for everyones convenience.

 

RPF1 wheels - 7.8 pounds per wheel less - got them from Goodwin racing. wider and lighter then stocks.

yeah that's right, 31.2 pounds of spinning mass removed. and 6 inches more rubber on the ground.

 

ACT prolite flywheel. 3.5 pounds spinning mass removed, (the rest moved to the center.)


see my flywheels, flywheels, flywheels thread for more options.

 

UR light weight pulleys. I dont have an exact number because I did not weigh them when I put them in, but I do know the numbers to other pulleys and that would put these right at 1 pound spinning mass lighter. (others are lighter, see the pulleys pulley pulleys thread for more options)


as everyone knows, dead weight is one thing, but spinning mass is by far more important.

also if someone wanted to be real specific. the weight of the drilled brake rotors would be lighter also. not much, but a little. times that by 4, and throw in the fact that it is spinning mass, and you got at least something to think about if you are already going to buy rotors. (that and they look cool!)

This is a guess, but lets say the drilled rotors were even only 1/4 pound less each. times that by 4 and you got your self 1 pound of spinning mass removed.

 

this from the Racing Beat web site.


Stock system + connecting-pipe = 39 lbs
Racing Beat Race Muffler (17.5 lbs) + Connecting-pipe (8 lbs) = 25.5 lbs
This is a 34% reduction in weight over the stock system!


thats 13.5 pounds dead weight saved.

 

since I was seriouse on all of those, I just couldent help myself.

you could always remove 3 lug nuts per wheel, take off the hood, doors, trunk, and bumpers, remove the seats and replace them with milk crates. take the exhaust off completly, and remove the entire engine and trans..... this should save a TON of weight!


sorry, I just had to.

 

Speeddemon...This is great!!

Keep it coming guys I appreciate the help...I will update the first page when I get home tonight with all these items!

Edit: Also, I will add a links section above in case there is more information on the mod in question like a DIY. All you have to do is provide the link.

 

race buckets with brackets save a **** load of weight. smaller battery race batteries..

 

I appreciate the input but I need facts only please. So if you have the actual weights and weight savings for the items you listend then please let me know.

Thanks!

Chris

 

Keep it coming guys...this is great...

More examples: After market seats and there weights, battery, carbon body panels, lighter strut bars, end links (must be lighter than stock to qualify), etc.

 

im only giving you suggestions, facts you will need to search for yourself.. try teamrx8's thread

 

remove the aftermarket system in ur trunk.............lightweight 17's.......remove the engine cover and battery cover that should save 5 lbs total.......light weight exhaust.....remove the back seats.........replace door panels with either fiberglass or carbon fiber......lightweight racing seats......carbon fiber or fiber glass body kit trunk, hood, spoiler if necessary.....cat delete pipe which should save easily 10 lbs... someone said it before light weight battery......... all that right there n u should run high 13's with just bolt ons considerin how much weight u save.......of course dont quote me on it, it sounded good lol

 

I am also performing a search to build this list but please only post the weights of the mod you actually have weights for.

No guessing please. Speeddemon got the point perfectly ...He gave me the weight difference between the Old (heavy) item and New (lighter) item. I already read TeamRx8's thread and will be moving some of that data over. I am asking for the help of the community so we can build a large list for everyone's convenience not just mine.

Thanks again guys and gals!

 

dont forget wheels, brakes, etc are unspring mass as well.

another good form of weight reduction. go on a diet not that any of you are fat or anything

 

According to Mazda, stock exhaust weighs 17,5Kg or 37,5lbs.
The Trust PE Ti exhaust (or any titanium exhaust), weighs 3,7Kg or 6,6lbs.
That's 14Kg or 31lbs of weight reduction right there

 

Yeah I just made that bold so people can see it better...

As far as a diet...Jenny Crag baby!

I seriously need to lose 40lbs...

I keep seeing different weights for the stock exhaust. I hear 37.5lbs or 38.6lbs so I figure I would play it safe and keep it at 39lbs.

As far as the TI exhaust can you tell me what it includes? Do you have a link that shows the weight/savings?

This is all great info! I also want to see CUSTOM WORK like Team's weight saving techniques. Custom fabricated items...etc.

 

From what I have seen, the stock exhaust weight varies from 17,5Kg to 18,5Kg, or from 37,5lb to 38,9lbs. According to my own weighting, it's 17,5Kg...

As for the site, I can only quote this one Trust Exhausts
but you can't see the weight in this window. I only know my own's weight cause I weighted it before I put it in....

 

unsprung mass is different from rotational mass. lightweight pullies reduces rotational mass but it is still sprung.

a good example of unsprung mass is brake calipers. you can save a few pounds of unsprung mass with the racingbrake aluminum 4pot calipers, but these do not reduce rotational mass

 

I always get those confused! Man that was a noob mistake if I ever seen one...hehe!

 

Bump...

Been busy lately but I plan on doing some major updating this weekend. Keep it posting!

 

Sorry everyone...had a busy weekend too but I should be able to log on tonight and do some updating.

Keep posting any projects you all worked on.

Thanks!

 

Interesting exercice. Good idea.

 

I thought so to but not many people are doing custom mods like this to reduce weight and those that are are either not posting about it or probably dont post at all on this forum so its been a pain to build this data.

However, everytime I do something custom or come across something custom to reduce weight I will make sure to find this thread and post.

Thanks!

 

wrong, Trust is saying that it's 6.1 - 6.2 kg = 13.3 - 13.5 lbs

still pretty dang light


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this thread needs an update