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Hi guys,

 

Been looking at 300 zx's for a while and I have always loved them, I still don't know too much about them though (mainly because many people say different things!)

 

I am planning on buying a 91 twin turbo that has 80,000 miles. Its all standard for the mo.

 

I wanna gut it and strip it out and only have the basics in, none of this a/c and electric seats etc.

 

I have a few questions though!

 

How much weight woukld I be able to remove from the car?? I wanna go pretty extreme, no back seats, no a/c, buckest seats and pretty much take out all the weight I can. How many KG's do you think I could shave off the factory weight?

 

Also, I have read I will get anywhere between 300-400bhp from an exhaust, CAI, chip, boost controller, bigger injectors and de-cat. So my question is what is a likely BHP figure? I would have though 360-370BHP would be likely?

 

Hopefully I am going to build an M3 killer, as the g/f won't let me do any more mods to it, so hence the 300 zx (she won't have to be seen in it, so I can unleash my modding urges on to the z!).

Featured Replies

You could begin get with a SWB (2 seater) or slicktop (2 seater with hardtop roof) to start off with the least weight in the first place.

 

Then stripping out everything you dont need/want you'll be able to drop a further 150-200kg. You could go really extreme with FRP or CF Body Panels (doors, tailgate..etc) and perhaps lose another 50kg - 75 kg. Be sure to maintain weight balance though!

 

My Slicktop TT kerb weight is around 1350kg with full interior and full sound deadening (but with bucket seats). The slicktop TT was just under 1500kg stock.

 

Power wise - Exhaust, decat, Chip and 1 bar boost will see your goal for a Flyhweel HP figure.

theres a weight reduction thread somewhere but i cant find it, i'm sure someone will be along soon to post it up for ya matey, and welcome to the madhouse

Buy a SWB to start with and you have saved 70Kg stait away. + the have no back seats. Then the seats weigh 49KG so swapping them for a pair of bucket seats could save as much as 37kg and thats before you start on al the rubbish like AVI, plunum heaters system, Hicas.

 

Then Z1 do fiberglass tail gates with pexi glass, FG doors, wings and bonnets. I'm sure read that you can loose about 300kg.

  • Author

Cheers guys and thanks for the welcome :)

 

Are the SWB's harder to come by?

 

On the list for removal is:

 

A/C and all heater related materials

Electric windows, seats, mirrors

Radio/speakers

BAck seats (if I don't find a SWB!)

Remove all Sound proofing.

Remove HICAS

Dash/ Dials?

 

Then add Lighter door pannels, bonnet and tail, and bucket seats

 

Anything else to remove?

 

I am thinking of removing dash and making a smaller fibre glass one, but not sure if its worth doing, due to not knowing the weight!

Cheers guys and thanks for the welcome :)

 

Are the SWB's harder to come by?

 

On the list for removal is:

 

A/C and all heater related materials

Electric windows, seats, mirrors

Radio/speakers

BAck seats (if I don't find a SWB!)

Remove all Sound proofing.

Remove HICAS

Dash/ Dials?

 

Then add Lighter door pannels, bonnet and tail, and bucket seats

 

Anything else to remove?

 

I am thinking of removing dash and making a smaller fibre glass one, but not sure if its worth doing, due to not knowing the weight!

They are rarer yes, and the even lighter & stiffer Slicktop is even rarer...but they are out there...in fact I can see 6 SWB's from where Im sitting right now and 3 of them are slicktop. :eek:

 

of the top of my head.....

 

Aircon (Pump, bracket, radiator, pipes, condensor)

EGR System

AIV System

Carbon cannistor

Hicas system (solenoid, pipes, rear rack)

Fit NA Pas system (smaller and lighter)

Lighteight drycell battery

Lightweight Pulleys

Lightweight Flywheel

Lightweight one piece propshaft

Full SS exhaust and decat system (lighter than stock)

NA Subframe and Diff (lighter and quicker accelerating ratio)

Lightweight seats

Remove stock spoiler

FRP/Carbon Tailgate

FRP/Carbon Doors (not recomended for a road car due to side impact protection)

Lexan Glass

Remove all sound deadening

Remove spare wheel and tools

Lightweight racing wheels

2 piece Brake discs with Alu bells/hats.

Stereo system

 

Dashboard does'nt weigh much tbh

  • Author
They are rarer yes, and the even lighter & stiffer Slicktop is even rarer...but they are out there...in fact I can see 6 SWB's from where Im sitting right now and 3 of them are slicktop. :eek:

 

of the top of my head.....

 

Aircon (Pump, bracket, radiator, pipes, condensor)

EGR System

AIV System

Carbon cannistor

Hicas system (solenoid, pipes, rear rack)

Fit NA Pas system (smaller and lighter)

Lighteight drycell battery

Lightweight Pulleys

Lightweight Flywheel

Lightweight one piece propshaft

Full SS exhaust and decat system (lighter than stock)

NA Subframe and Diff (lighter and quicker accelerating ratio)

Lightweight seats

Remove stock spoiler

FRP/Carbon Tailgate

FRP/Carbon Doors (not recomended for a road car due to side impact protection)

Lexan Glass

Remove all sound deadening

Remove spare wheel and tools

Lightweight racing wheels

2 piece Brake discs with Alu bells/hats.

Stereo system

 

Dashboard does'nt weigh much tbh

 

Thanks, a lot of things I wouldn't have thought on that list at first!

 

Will the car still idle OK on start up with the removal of the EGR/AVI systems??

 

Are they DIY's for removal of a/c , egr etc?

 

Thanks :D

Also, I have read I will get anywhere between 300-400bhp from an exhaust, CAI, chip, boost controller, bigger injectors and de-cat. So my question is what is a likely BHP figure? I would have though 360-370BHP would be likely?

 

At last someone who is realistic ! I like you already.

 

We've had too many people who have come online and said I'm buying a 300zx I will put a chip in it and be good for 500 bhp blah blah blah.

It's good to get someone looking to take on a project and is realistic in his goals.

 

In terms of BHP, I guess it tottaly depends on the dyno you use. But as an average, if you start with a strong engine, you would at a push be able to achieve the figures you have quoted without the need to upgrade your injectors. If you substitute injectors with after market intercoolers, you should be able to push 14 psi on stock injectors and turbo's without any problems. This should get you up around the 360 - 370 bhp figure.

 

As a guide I hit the following figures at Thor (so the BHP is at the Hub not the flywheel or rear wheels).

The mods I had at the time were: Stock internals, stock tubs, stock injectors, Howe Rad, Uprated oil cooler, Greddy SMIC's, Electric Fan (replaces viscous), lightened underdrive pulley, apexi induction & uprated exhaust with decat.

 

14.8 psi

350.4RWHP@6290rpm,

388.2ft/lb Torque@4594rpm

 

If you do decide to go ahead with your project, It would be very interesting to see what 1/4 mile times you can get with all that weight saving.

 

Welcome to the forum and good luck with your project :)

legrath, sorry to hijack this thread but can you please tell me if the aiv's can be simply drained as they are gurgling on tick over, if so how is this acheived

Thanks, a lot of things I wouldn't have thought on that list at first!

 

Will the car still idle OK on start up with the removal of the EGR/AVI systems??

 

Are they DIY's for removal of a/c , egr etc?

 

Thanks :D

 

There should be plenty of info on both here and the other 300zx sites in the states and AUS about DIY removals.

 

AVI are easy to remove. EGR's are a littl emore tricky and you need a blanking plate. Idle is fine by removing these.

 

You may want to think about removing your viscous fan and replacing with an electric, the fan it self is pretty heavy and freeing it will only improve your weight saving.

legrath, sorry to hijack this thread but can you please tell me if the aiv's can be simply drained as they are gurgling on tick over, if so how is this acheived

 

 

You can drill a small hole in the bottom to sort this problem out and then use a grommet / bung to seal it back up, I'll try and find the tech article. and link it in.

 

http://www.pexcom.com.au/z32cms/e107_plugins/content/content.php?content.49

Thanks, a lot of things I wouldn't have thought on that list at first!

 

Will the car still idle OK on start up with the removal of the EGR/AVI systems??

 

Are they DIY's for removal of a/c , egr etc?

 

Thanks :D

 

yes, no problems with AGR or AIV removal. The AIV removal can make it run slightly richer at idle, but most aftermarket ECU Chips disable the AIV anyway and fix that issue.

thanks for that Stu, its only been bugging me for 3 years, lol, another job for the weekend

You can pull the Pipe off the bottom, let the water drain, and put it back...rather than drilling and resealing.......or just rip the entire thing out.

You can pull the Pipe off the bottom, let the water drain, and put it back...rather than drilling and resealing.......or just rip the entire thing out.

cheers matey, i'll just do that then :cool:

 

thats the 1 i was lookin for :rolleyes: duuuuuur, lol.

  • Author
At last someone who is realistic ! I like you already.

 

We've had too many people who have come online and said I'm buying a 300zx I will put a chip in it and be good for 500 bhp blah blah blah.

It's good to get someone looking to take on a project and is realistic in his goals.

 

 

Lol thanks!

 

It's the same with all cars I have owned and I'll start talking to someone with the same car and they start going off on about X amount of BHP gained from doing this and that and often it's complete rubbish! lol

 

 

In terms of BHP, I guess it tottaly depends on the dyno you use. But as an average, if you start with a strong engine, you would at a push be able to achieve the figures you have quoted without the need to upgrade your injectors. If you substitute injectors with after market intercoolers, you should be able to push 14 psi on stock injectors and turbo's without any problems. This should get you up around the 360 - 370 bhp figure.

 

 

I def be going up to larger injectors and 14 PSI, just hope for the best for the turbos :D

 

 

 

As a guide I hit the following figures at Thor (so the BHP is at the Hub not the flywheel or rear wheels).

The mods I had at the time were: Stock internals, stock tubs, stock injectors, Howe Rad, Uprated oil cooler, Greddy SMIC's, Electric Fan (replaces viscous), lightened underdrive pulley, apexi induction & uprated exhaust with decat.

 

14.8 psi

350.4RWHP@6290rpm,

388.2ft/lb Torque@4594rpm

 

If you do decide to go ahead with your project, It would be very interesting to see what 1/4 mile times you can get with all that weight saving.

 

Welcome to the forum and good luck with your project :)

 

 

Nice figures!

 

I am definatley going ahead with this project! I am aiming to get the car down to 1,250 ish KG which seems pretty achievable and with 360 or so BHP, should be pretty fast!

 

 

There should be plenty of info on both here and the other 300zx sites in the states and AUS about DIY removals.

 

AVI are easy to remove. EGR's are a littl emore tricky and you need a blanking plate. Idle is fine by removing these.

 

You may want to think about removing your viscous fan and replacing with an electric, the fan it self is pretty heavy and freeing it will only improve your weight saving.

 

Fan has been added to the list, thanks :)

 

I will have to check those other sites outs you mentioned too!

 

yes, no problems with AGR or AIV removal. The AIV removal can make it run slightly richer at idle, but most aftermarket ECU Chips disable the AIV anyway and fix that issue.

 

Was not aware the chip could do this, nice to know! Thanks man

 

 

:hyper::hyper::hyper: Stage V baby :D

 

Thanks for the link!

 

Here my friend... is the perfect car for you to start with. Ideal for what you want and would make a storming track car.

 

http://www.300zx.co.uk/forums/showthread.php?t=111845

 

That is an awesome car and even a manual too! Damn! But, those damn damn buts, I have to get rid of my Zx6r first to make some space and free up some "mod" money!

 

If the bike is gone and you still have the Zed then I'll be interested! Unless you fancy a part e/x?? ( 54 reg kawasaki Ninja)

much as i wish it was the car isnt mine buddy. just pointing you to the forsale section. mines the old long grey floppy one in my signiture! just a tin top tt manual shortie, is best for the job! the one you want!

  • Author

Ok guys I have drawn up a list of what is going to be removed!!

 

So far I have got:

 

Items to be Removed:

 

Electric Windows………………………………………………………………...1.3 kg

Electric Mirrors…………………………………………………………………….1.3 kg

Headlight Aimers........................ ……...........................1 kg

Cruise Control………………………………...... ….... …………………….1 kg

Rear Wipers………………………………....... ............................1.2 kg

Radio, Speakers and all Associated Wiring..…………………….. 13.6 kg

Antenna and all Associated Wiring………………………………….... 0.8 kg

Cargo Cover………………………………......... ..........................2.2 kg

Spare Tire, Jack, Wheel Chock’s, and Inflator Can……………14.5 kg

Rear Hatch Weight………………………………....... ...................1.3 kg

Rear Tow Hooks………………………………........ ..................... 1.5 kg

PRVR System………………………………....... .......................... 0.5 kg

Center Support Bearing………………………………...……. ...…..... 0.5 kg

Timing Belt Covers………………………………....... ...................1 kg

Fan Shroud………………………………....... .............................1 kg

AIV System………………………………....... ........................ .... 4 kg

T-Top Wind Blockers………………………………..... .................. 0.5 kg

T-Top Shades………………………………....... ...................... ... 1 kg

Fog Light Air Ducts……………………………..…...... .................. 1 kg

All 4 Strut Actuators ………………………………………….……………... 1 kg

Sound Proofing……………………………………………………………………. 15 kg

Front Carpet w/ Insulation Attached…………………………………. 6.8 kg

Rear Rug and Wooden Spare Cover…………………………………..3.6 kg

ALL Plastic Panels with their Insulation Attached…………….. 10 kg

All Tweed and Carpet Covered Panels………………………………. 4.5 kg

Misc. Insulation………………………………... ........................... 2.2 kg

Rear Pressure Equalizing Vents……………………………….......... 1 kg

All A/C related items …………………………………………………………. 19 kg

Air Bag ……………………………………………………………………………….. 3 kg

EGR System………………………………………………………………………… 2.2 kg

Carbon Canister………………………………..... ....................... . 1 kg

HICAS Removal and NA Power Steering System Install….. 17 kg

All wires no longer in use if from items removed…………..… 9 kg

Door Skins………………………………........ ............................. 4 kg

Turbo Deck……………………………………………………………………….. 4.5 kg

 

 

Weight saved by lightweight parts:

 

Seats……………………………..24 kg

Battery…………………………… 1 kg

Cats/pre-cats………………… 7 kg

Fly wheel……................. 3.5 kg

Under drive ……………….... 4 kg

Full SS exhaust ……………. 4 kg

NA Subframe and Diff …..22 kg

Lightweight racing wheels……4 kg

Fibre Glass Bumpers…………….4kg

Airbox/Induction………….…………....2 kg

Steering Wheel……………………….....2 kg

Door Skins…………………………........5 kg

Turbo Deck……………………………….. 5 kg

 

 

Total KG loss so far………… 239.5 KG

 

Not too bad!

 

Anyone know what the back seats weight? These will be coming out too, but couldn't find out weight of them anywhere?

 

Anyone else think of items I can get away with? Not including light panels, glass etc.

 

I thinking more parts that can be taken out (for now)! Once I get the car I am sure I'll find a few more things :D

 

With this weight saving and around 370bhp I am looking at rough;ly 270bhp per tonne. Really want to get to the 300BHP per Tonne, though! :wack:

Ok guys I have drawn up a list of what is going to be removed!!

 

So far I have got:

 

Items to be Removed:

 

Electric Windows………………………………………………………………...1.3 kg

Electric Mirrors…………………………………………………………………….1.3 kg

Headlight Aimers........................ ……...........................1 kg

Cruise Control………………………………...... ….... …………………….1 kg

Rear Wipers………………………………....... ............................1.2 kg

Radio, Speakers and all Associated Wiring..…………………….. 13.6 kg

Antenna and all Associated Wiring………………………………….... 0.8 kg

Cargo Cover………………………………......... ..........................2.2 kg

Spare Tire, Jack, Wheel Chock’s, and Inflator Can……………14.5 kg

Rear Hatch Weight………………………………....... ...................1.3 kg

Rear Tow Hooks………………………………........ ..................... 1.5 kg

PRVR System………………………………....... .......................... 0.5 kg

Center Support Bearing………………………………...……. ...…..... 0.5 kg

Timing Belt Covers………………………………....... ...................1 kg

Fan Shroud………………………………....... .............................1 kg

AIV System………………………………....... ........................ .... 4 kg

T-Top Wind Blockers………………………………..... .................. 0.5 kg

T-Top Shades………………………………....... ...................... ... 1 kg

Fog Light Air Ducts……………………………..…...... .................. 1 kg

All 4 Strut Actuators ………………………………………….……………... 1 kg

Sound Proofing……………………………………………………………………. 15 kg

Front Carpet w/ Insulation Attached…………………………………. 6.8 kg

Rear Rug and Wooden Spare Cover…………………………………..3.6 kg

ALL Plastic Panels with their Insulation Attached…………….. 10 kg

All Tweed and Carpet Covered Panels………………………………. 4.5 kg

Misc. Insulation………………………………... ........................... 2.2 kg

Rear Pressure Equalizing Vents……………………………….......... 1 kg

All A/C related items …………………………………………………………. 19 kg

Air Bag ……………………………………………………………………………….. 3 kg

EGR System………………………………………………………………………… 2.2 kg

Carbon Canister………………………………..... ....................... . 1 kg

HICAS Removal and NA Power Steering System Install….. 17 kg

All wires no longer in use if from items removed…………..… 9 kg

Door Skins………………………………........ ............................. 4 kg

Turbo Deck……………………………………………………………………….. 4.5 kg

 

 

Weight saved by lightweight parts:

 

Seats……………………………..24 kg

Battery…………………………… 1 kg

Cats/pre-cats………………… 7 kg

Fly wheel……................. 3.5 kg

Under drive ……………….... 4 kg

Full SS exhaust ……………. 4 kg

NA Subframe and Diff …..22 kg

Lightweight racing wheels……4 kg

Fibre Glass Bumpers…………….4kg

Airbox/Induction………….…………....2 kg

Steering Wheel……………………….....2 kg

Door Skins…………………………........5 kg

Turbo Deck……………………………….. 5 kg

 

 

Total KG loss so far………… 239.5 KG

 

Not too bad!

 

Anyone know what the back seats weight? These will be coming out too, but couldn't find out weight of them anywhere?

 

Anyone else think of items I can get away with? Not including light panels, glass etc.

 

I thinking more parts that can be taken out (for now)! Once I get the car I am sure I'll find a few more things :D

 

With this weight saving and around 370bhp I am looking at rough;ly 270bhp per tonne. Really want to get to the 300BHP per Tonne, though! :wack:

 

Lightweight propshaft will save abotu 7kg ,and Lightweight flywheel will also save about 7kg. A drycell lightweigth battery will save 10kg

 

The rear seats weight 5kg total.

  • Author
Lightweight propshaft will save abotu 7kg ,and Lightweight flywheel will also save about 7kg. A drycell lightweigth battery will save 10kg

 

The rear seats weight 5kg total.

 

Ah ok, thanks!!

 

Can't edit my posts for some reason, so I have to repost my list, again!

 

Items to be Removed:

 

Electric Windows………………………………………………………………...1.3 kg

Electric Mirrors…………………………………………………………………….1.3 kg

Headlight Aimers........................ ……...........................1 kg

Cruise Control………………………………...... ….... …………………….1 kg

Rear Wipers………………………………....... ............................1.2 kg

Radio, Speakers and all Associated Wiring..…………………….. 13.6 kg

Antenna and all Associated Wiring………………………………….... 0.8 kg

Cargo Cover………………………………......... ..........................2.2 kg

Spare Tire, Jack, Wheel Chock’s, and Inflator Can……………14.5 kg

Rear Hatch Weight………………………………....... ...................1.3 kg

Rear Tow Hooks………………………………........ ..................... 1.5 kg

PRVR System………………………………....... .......................... 0.5 kg

Center Support Bearing………………………………...……. ...…..... 0.5 kg

Timing Belt Covers………………………………....... ...................1 kg

Fan Shroud………………………………....... .............................1 kg

AIV System………………………………....... ........................ .... 4 kg

T-Top Wind Blockers………………………………..... .................. 0.5 kg

T-Top Shades………………………………....... ...................... ... 1 kg

Fog Light Air Ducts……………………………..…...... .................. 1 kg

All 4 Strut Actuators ………………………………………….……………... 1 kg

Sound Proofing……………………………………………………………………. 15 kg

Front Carpet w/ Insulation Attached…………………………………. 6.8 kg

Rear Rug and Wooden Spare Cover…………………………………..3.6 kg

ALL Plastic Panels with their Insulation Attached…………….. 10 kg

All Tweed and Carpet Covered Panels………………………………. 4.5 kg

Misc. Insulation………………………………... ........................... 2.2 kg

Rear Pressure Equalizing Vents……………………………….......... 1 kg

All A/C related items …………………………………………………………. 19 kg

Air Bag ……………………………………………………………………………….. 3 kg

EGR System………………………………………………………………………… 2.2 kg

Carbon Canister………………………………..... ....................... . 1 kg

HICAS Removal and NA Power Steering System Install….. 17 kg

All wires no longer in use if from items removed…………..… 9 kg

Door Skins………………………………........ ............................. 4 kg

Turbo Deck……………………………………………………………………….. 4.5 kg

Rear Seats……………………………………………………………………………5 KG

 

 

Weight saved by lightweight parts:

 

Seats……………………………..24 kg

Battery…………………………… 10 kg

Cats/pre-cats………………… 7 kg

Fly wheel……................. 7 kg

Under drive ……………….... 7 kg

Full SS exhaust ……………. 4 kg

NA Subframe and Diff …..22 kg

Lightweight racing wheels……4 kg

Fibre Glass Bumpers…………….4kg

Airbox/Induction………….…………....2 kg

Steering Wheel……………………….....2 kg

Door Skins…………………………........5 kg

Turbo Deck……………………………….. 5 kg

 

 

Total KG loss so far………… 260. KG

 

New BHP per tonne......... 274

 

Goal............................300bhp/tonne

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