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240z, 260z or 280z, chassis/body differences

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So the 240Z does sit lower than the 280Z? I always thought that it seemed smaller or something.

 

Go to the chassis and suspension board I think it is and look for the thread Z car weights and read through that. You'll see that there isn't really a huge difference in the overall weight differences and that even later 280Zs can be made to be really light.

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Oh yeah. Because of the collision rule put in by the government in the late 70's the 280Z had to pass the 5 mph crash test. Thus those ugly front bumpers and raised height to meet the spec. I put in Tokico 2" lowering springs and struts in my 280Z. It looks so much better and handles better too, a little stiff ride but I like that.

 

 

So the 240Z does sit lower than the 280Z? I always thought that it seemed smaller or something.

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I don't know the exact weight savings but I did weigh the bumpers along with their shocks and hardware. It came close to 100 pounds. I used fiberglass bumpers which weigh nearly nothing instead of real steel 240Z bumpers.

Like others have said most of the added weight is in structure so you can only remove so much from the 280Z. Its all about power to weight so sure adding HP will compensate for the extra weight of the 290Z, but then again you could put that same engine in a 240Z. If you want a race car go as light as you can. If its a street car its not that important. My car weighs 2905 and still turns in the 12.9s and get 18.5 mpg in town, I'm happy.

 

Anything else??? I am just trying to figure out if I am better off with the improvements of the 280z.

How much more weight does a 280z with the front and rear bumper removed weight versus a 240z???

I would imagine that a 280z with a stroked engine (3.1) would compensate for the additional weight of the 280z.

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I think that was something mentioned in one thread. Even though the 280Z is a bit heavier in the chassis itself it's not all bad it does come with advantages. The fact that the longer/thicker frame rails and floor pans help to stiffen the body a bit more and just provide a nicer overall ride. Really as it's been mentioned they are the same chassis it's just that the 280Z chassis weighs more. So your 280Z will be just as sporty as a 240Z. If you really want you can then remove the bumpers and the turn signals from the grill. Replace the little lower valence panels with the 240/260Z panels so you have the turn signals below the bumpers and you'll then have a car that more closely resembles a 240Z. If you really want to go all the way then with fab work you can change the rear taillights to 240Z lights. At that point exterior wise it would be hard to tell the difference.

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I think that was something mentioned in one thread. Even though the 280Z is a bit heavier in the chassis itself it's not all bad it does come with advantages. The fact that the longer/thicker frame rails and floor pans help to stiffen the body a bit more and just provide a nicer overall ride. Really as it's been mentioned they are the same chassis it's just that the 280Z chassis weighs more. So your 280Z will be just as sporty as a 240Z. If you really want you can then remove the bumpers and the turn signals from the grill. Replace the little lower valence panels with the 240/260Z panels so you have the turn signals below the bumpers and you'll then have a car that more closely resembles a 240Z. If you really want to go all the way then with fab work you can change the rear taillights to 240Z lights. At that point exterior wise it would be hard to tell the difference.

 

so the rear tailight from the 280z is not interchangeable with the tailight from the 240z??? I mean without mayor fab??? what is the difference??? the mounting hardware/brackets???

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I'm not sure. The best way would be to take measurements of the 240Zs back panel like the size of the lights and the locations of them and then map it out on the 280Z. I'm sure it's possible to make them fit. It'd probably require making a bracket out of sheet metal or something and possibly fiberglassing in the other open areas.

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I have a 1970 I am swapping the V8, suspension, and brakes over to a an early 74.

fuse panel moved, heavy bumpers, door side impact bars, air conditioning provisions, different wiring, different seat belt system.

 

years ago i read somewhere 260's moved from early 240 stuff to 280 stuff as parts ran out. So to say 260's had "xyz" is incorrect other then the list above.

Many non california 73 240's had the good carbs.

 

FWIW, my 260 was 2300 pounds dry with AC which is pretty light.

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Did your 74' that weighed 2300lbs have the large bumpers or the thin 240Z style bumpers? Either way I kinda believe the whole parts running out thing. Looks like a similar thing with my 280ZX. It from what I can tell was one of the last few and it kind of has a really rare setup. It's a factory turbo, but has the analog dash, the manual heater controls, doesn't have the full power setup, cloth lowback 2+2 seats. Just sorta seems like a combo you didn't normally find.

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Guest Rolling Parts

I believe that the rear sway bar started with the 260 and then in all the later years.

If you like "the shape" then a 280 is newer and has a lot of little improvements.

The original 240Z (IMO) was rushed to market and needed a lot of tweaks over the years to make it stronger and faster (which is why it's a prime car to get upgraded these days with ZX engines and heads, ZX transmissions, ZX differentials, ZX electronic distributors, ZX turbo half shafts, strut braces, air dams, etc, etc).

 

The 240 in it's original form reminds me of the original 1964.5 Mustang inline 6 car. Great simple design that inspired everyone to demand more power, more speed, and more strengh to hold it together.

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Great info here..

I second that. This is good reading for the noob that I am.

 

I'm still researching and reading about which bodystyle I want to dive into. I've been told that the 240 has a 'weaker' frame for those who want a powerful engine. At this point, I'm not sure which S30 I want to go with, but it sounds like I might lean towards a 280. However, I'm also following another member on here who's inspired me to look into the 240 frame.

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I've been told that the 240 has a 'weaker' frame for those who want a powerful engine.

 

Creating (and using) grip, longitudinally and laterally, will stress the chassis more than a specific engine will.

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70-73 240z had 16mm front sway bars, 74 had 18mm front 20mm rear (weird) All 2+2's had 20mm front and rear

IF you want to put a rear sway bar in a 240z only a 260 bar will fit, Its got an extra bend in the middle. Did it...

73 got a vapor tank, collapsible steering wheel and non flammable interior!! yay! and 240z also have 3 different choke nobbs

sometime between 74 and 75 there was a change from a 45amp gauge + shunt as an all in one, to a 60amp gauge and big box in the engine bay

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I've noticed that some of the later Z models (260 and 280) have physical body lines, and some don't. Do they all have them and some people just take them off? I don't usually post because the answer's always somewhere in these forums, but I still haven't seen a definitive answer on this...

post-10815-12687233770229_thumb.jpg

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I've noticed that some of the later Z models (260 and 280) have physical body lines, and some don't. Do they all have them and some people just take them off? I don't usually post because the answer's always somewhere in these forums, but I still haven't seen a definitive answer on this...

That is a dealer/aftermarket installed accessory, mostly so the dealer could make a bigger profit by loading up the car.

I personaly don't like them. :angry:

Edited by jasper

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Why will no one answer this question?

 

 

 

 

There are interior differences between the 240 and 280 that could make a cage model specific.  For example, the 280Z strut towers are taller in the hatch area.  77 and 78 280Z's have a raised full wooden deck under the hatch carpeting.

 

 

 

Edited by cygnusx1

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Here's a question to add:

      Why is it that the 280 weighs SO much more? Is it more than just the bumpers? Beefier frame??

 

 

 

 

Heavier sheet metal in many places, bigger dash, sound insulation, more wiring, thicker carpeting, larger frame rails, thicker interior plastic panels, more parts, bumpers, exhaust, EFI, steering rack is iron, and more...

 

 

 

 

Did anyone mention that the 240Z has a quicker steering ratio in the rack? (yes Paul did!)  I feel a huge difference between the two.

Edited by cygnusx1

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I thought the only weight difference from the 240z,260z and the 280z was that most of the weight difference came from the heaver front and rear bumbers that were alot bigger on the 280 compared to the 240 and 260?

 

I'm not sure what you are asking here or are you just thinking out-loud?

 

If your question is indeed a question, it was answered in this thread already, starting on page 1. :blink:

If commenting for the sake of commenting with a rhetorical question that serves no point, I don't understand? :unsure:

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