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I want to loose weight on my Z31 without compromising safety and keeping the interior as well.

the heavy as hell dash will be replaced with lightweight sheet metal and covered with leather or cloth to cushion it in case of a accident. where else can i lose weight on the Z31?

A/C is gone power steering is gone EGR is gone. My goal is from 2,400 pounds to 2,600 pounds no driver and with a full tank of gas.

Heres some things I did with my car:

Remove all vents, ducts ect behind dash.
Remove A/C, lines, belts, pulleys
Heater core can go possibly?
Remove all sound deadening material under carpets and behind dashboard.
Remove stereo
Remove spare tire and jack
Racing seats are lighter if you buy full bucket, generally.
Carbon fiber body parts, fiberglass or car doors, hood and hatch help ALOT

You will do the basic weight reduction for easy moneyless weight savings by removing stuff. From there, theres a formula of about $1000 USD per 50-75lbs of weight savings.

lightweight wheels
lightweight 2peice rotors
lightweight clutch and flywheel or any lighter engine parts (But factor in the consequences if all the engine components are to light)
1 piece drive shaft
Smaller fuel tank
Replace glass with plastic/perspex (door, quarter and hatch)
Smaller battery (cant remember much about them but they are a lot lighter and pack the same if not more punch than the standard battery)
Remove and covers that aren't necessary.
Newer light suspension parts
Smaller titanium exhaust side exit if legal or if you want it?
Lighter Aftermarket radiator so on with aftermarket parts replace anything with a lighter variant.
Many other things that have either been said or i forgot/don't know about.
Also think about weight distribution throughout the car you don't want to end up make the car handle worse or be unbalanced just to save a few pounds.

Also sign up and check this out this guy is doing a similar thing but with his Z32 very interesting and good read!
http://300zxclub.com/showthread.php?t=8285...roject+slicktop

This post has been edited by Lethal300 on Dec 3 2010, 08:14 AM

Remove engine and transmission.

Roll down hill.





seriously though, the Z31 is a fairly light and aerodynamic car as is. The time and money you spend making the car later is going to give you only a fraction of the power to weight ratio that spending the same amount of time and money on adding power will.

More power to you if you really want to do that, but personally, I'd say devote that energy to your engine and suspension. You'll get a lot more bang for your buck so to speak.

This post has been edited by TexasDemonZ on Dec 4 2010, 12:55 AM

Cut some speed holes.

rust has always taken care of that for me.

Treadmill, son.

continuing on this, how bout a shake-weight?

No that builds muscle, which weighs more than fat... though I must admit, it would be a very fitting exercise for him.

Sell it and buy an s30

well on my other z31 it was 2500 pound race weight including driver and fuel, but that was if everything removed, holes in the back cut for clearance and so on and so forth!

I just bought a s30, so as of right now I have 2 z31's and an s30, one of the z31's will be gone soon though!

Cut the roof off.
Remove transmission.
Remove bumpers.
Remove all seats.

This. Oh yes. Or, just drive it into a nice spot, and step back a few feet.

i got a carbon hood thats all you need to make the z31 lighter.
i have been drifting my z31, its pretty much gutted. after the digi dash
all the luxury gone it feels as light as my friends 240 but with more power.
i recommend you drift it.

i personally hate drifting it completely destroys a car, sure it's fun but the body flexes a lot and there's really no point in it only for the "cool" factor.

i could give 3 shits about cool factor I'm all about functionality.

coming from someone whose car often isn't functioning and is considered one of the more difficult Z chassis to make functionally sporty, those are some mighty fine words.

I'm curious. What exactly are the consequences of making engine parts too light?

They break?

There's a ton of different answers to this question depending on which part you're talking about but they all pretty much lead to the same thing.


By the way J, I think Mark Hamill's Joker laugh would do well in this situation.

This post has been edited by Oddmanout84 on Jan 3 2011, 09:51 PM

i do not do it to be cool. i do it because it might be the only way out of this shitty apartment. i do it because i started drifting at age 11 on a dunebuggie, my experiance and the money i have saved after i found out theirs a sport for it have allowed me to compete.
my z31 is the key why im standing out, that why i mentioned it to you.
when i go out their halve the people dont know not even a fragment of the z31.
i plan on buying another one as a daily driver, contrary to what people believe the VG is one of the greatest engines in the 80's and later the z32 VGtt in the 90's

I was under the impression that making an engine part lighter naturally meant you would also be using a stronger material to deal with the greater forces that can be exerted.

you would have to be able to break apart the engine, but theirs plenty of parts you can upgrade internally to provide easier power for the engine

Well, you just said "make it lighter", you didn't specify how. Its possible to remove weight from stock components simply by shaving areas of them down. This is done with rocker arms in order to balance them etc and make them slightly lighter. But there are disadvantages to this as well. You also have to think about availability. I'd love to have a tungsten engine block, but I can't seem to find one.

One example of an (exterior) engine upgrade would be an aluminium flywheel. It is lighter, but not nearly as strong as the stock and usually steel component it replaces. Using this will reduce drivetrain inertia and allow the engine to rev quicker, but it will also lose energy faster. This can make it more difficult to shift, as the revs quickly go down and also makes the car prone to stalling. Aluminium flywheels are also less durable and prone to cracking under stress. When this happens, the driver can lose a leg.

There are tradeoffs no matter what you do.

Pull out the seats, carpet, rear side plastic stuff, dynamat, etc


stuff you do not need

I completely agree with you the VG is a very great motor for it's time and still is even today as well as the TT.

im part of a website called 88hybrid.com check it out some time best z31 enthusiast spot, several link to others their too