Spider weight loss plan

Make it go fast! Kick it up a notch. Post tips in here.
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RRoller123
Posts: 6913
Joined: Sun Nov 13, 2011 2:04 pm
Your car is a: 1980 FI SPIDER 2000
Location: PLYMOUTH, MA USA
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Re: Spider weight loss plan

Postby RRoller123 » Mon Aug 28, 2017 7:35 am

Here are a few weight reductions that I got, some on purpose, some that just were achieved by making changes for other reasons.

- Lightened Flywheel (Mark's).
- Gear Reduction Starter (AR).
- Aluminum Radiator (AR).
- Removed Spare Tire (my 5th 14" wheel doesn't fit under there anyway, carry big can of "fix-a-flat" now).
- Aluminum adjustable cam gears. (Mark's).
- Temporary Test Pipe in place of CatConverter.

Planned:

- Eventually, the bumpers, but not yet.
- Aluminum Crank Pulley.
'80 FI Spider 2000 (rolling "resto")
'74 X1/9 (many years ago)
'79 X1/9 (fewer years ago)
'86 Jaguar XJ6 (2nd Hobby Car)
2011 Chevy Malibu (daily driver)
2010 Chevy Silverado 2500HD Ext Cab 4WD/SB
2015 Keystone Montana High Country 343RL

QuebecFiatSpider
Posts: 22
Joined: Thu Jun 29, 2017 6:02 am
Your car is a: 1980 Fiat Sport Spider 2000i Pininfarina

Re: Spider weight loss plan

Postby QuebecFiatSpider » Mon Sep 04, 2017 12:22 pm

Ok here is another weight value. The spare Wheel and its tire = 31 lbs (14.09 kg.)

Image

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baltobernie
Posts: 3290
Joined: Sun Nov 25, 2007 6:00 pm
Your car is a: 1973 Spider
Location: Highland, MD

Re: Spider weight loss plan

Postby baltobernie » Mon Sep 04, 2017 1:10 pm

Fiat wheels:
turbo {14 x 5½} 14# 8 oz.
biturbo {14 x 6} 12# 5 oz.
CD-3 {13 x 5} 8# 9 oz. no that is not a typo

Regarding lightened flywheel:
I've found little "seat of the pants" improvement in acceleration, but I have noticed that the RPMs drop quicker between shifts. Because I change gears delicately, I need to add revs both upwards and down when shifting. It's a nuisance, and if I ever need to drop the trans again, the flywheel will be in the For Sale column.

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v6spider
Posts: 1025
Joined: Tue Feb 28, 2006 6:57 pm
Your car is a: 4.3L V6 Powered 1972 124 FIAT Spider
Location: Mount Vernon WA
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Re: Spider weight loss plan

Postby v6spider » Mon Sep 04, 2017 10:32 pm

baltobernie wrote:Fiat wheels:
turbo {14 x 5½} 14# 8 oz.
biturbo {14 x 6} 12# 5 oz.
CD-3 {13 x 5} 8# 9 oz. no that is not a typo

Regarding lightened flywheel:
I've found little "seat of the pants" improvement in acceleration, but I have noticed that the RPMs drop quicker between shifts. Because I change gears delicately, I need to add revs both upwards and down when shifting. It's a nuisance, and if I ever need to drop the trans again, the flywheel will be in the For Sale column.


Not surprised! I think it's more of a perceived gain than actual gain.

Cheers!
Rob

PhillySpider
Posts: 284
Joined: Tue Apr 26, 2016 6:51 pm
Your car is a: 1980 Spider 2000
Location: New Hope, PA

Re: Spider weight loss plan

Postby PhillySpider » Tue Sep 05, 2017 10:39 am

This whole thread reminds me of that saying..."you can put lipstick on a pig, but it's still a pig". I'll stick with the survivor theme...running on my magnesium wheels of fire! If you want better performance cheap couldn't you buy a $2,000 used hyundai that'll bury our performance enhanced spiders?...Just saying, there's a certain nostalgia and satisfaction to simply driving it as it is and maintaining it properly.

QuebecFiatSpider
Posts: 22
Joined: Thu Jun 29, 2017 6:02 am
Your car is a: 1980 Fiat Sport Spider 2000i Pininfarina

Re: Spider weight loss plan

Postby QuebecFiatSpider » Tue Sep 05, 2017 12:28 pm

PhillySpider wrote:This whole thread reminds me of that saying..."you can put lipstick on a pig, but it's still a pig". I'll stick with the survivor theme...running on my magnesium wheels of fire! If you want better performance cheap couldn't you buy a $2,000 used hyundai that'll bury our performance enhanced spiders?...Just saying, there's a certain nostalgia and satisfaction to simply driving it as it is and maintaining it properly.


I entirely agree with what you said. But as per my nature of always trying to improve things, I'll continue my search to improve my Spider 2000 mechanically and trying to get more and more fun driving it :)

PeterCecil
Posts: 5
Joined: Sun Oct 29, 2017 9:49 pm
Your car is a: 1979 2000 Spider

Re: Spider weight loss plan

Postby PeterCecil » Tue Oct 31, 2017 9:59 pm

johndemar wrote:How much do you weigh? :D
Ouch! :D

DieselSpider
Posts: 1417
Joined: Wed Dec 24, 2014 10:21 pm
Your car is a: 1978 124 Spider with Isuzu Turbo Diesel

Re: Spider weight loss plan

Postby DieselSpider » Wed Nov 01, 2017 12:06 am

You'd have to lay out some substantial cash to get a vintage 124 with the original engine to match the performance of most econo-boxes and even more to beat one of them. My base model Nissan Leaf which I picked up used for less than $10,000 is much quicker off the line and to the max lawful speed on a public roadway than most mid priced sports cars today.

That said my Spider mods are being aimed at reliability and great fuel economy. A solid 50 mpg while cruising is the ultimate goal.

I don't fit the 150 lb driver and passenger spec of the Spider either.

BSmith79
Posts: 46
Joined: Sat Oct 07, 2017 12:14 pm
Your car is a: 1979 124 spider 2000

Re: Spider weight loss plan

Postby BSmith79 » Fri Nov 10, 2017 8:46 am

bit of fun here although looking at ballpark figures

https://robrobinette.com/et.htm
2310 curb weight plus 180 pounds of driver = 2490= 17.92 et 1/4 mile
minus 100 lbs = 17.68

.24 elapsed time improvement per 100 lbs, .024 per 10 lbs

If I took 3 months and lost 20 lbs I could net a .04 ET reduction, if I took my bumper off this afternoon saying it weighed 30 lbs I get a .07 reduction. You realize what that means?---yes, pass the pasta porfavore! :D

The thing about weight reduction is there are not too many variables to consider as with power mods-its gonna work at all power vs weight levels and despite level of tuning. how much and is it worth it is another story.

my own take on HP/torque/weight is it comes down to the seat of the pants feel. Is your tuning making the car harder to drive? Is the power there when you want it. do you have to be right on the money for rpm and gear? is the power band narrow or wide?

I have a stock 79 2.0 -honestly it feels okay above 3k rpm driving through the mountain twisties, I would say I would like more power at about 3-3500k pulling out of corners and back up to speed and a nice intake and exhaust sound to go with that--thats just pure enjoyment as if I was the only car on the road not competing with anything but my own driving experience. Plenty of diesel quad cab trucks that can clean my clock unless we get in the tight twisties ---thats where $6000 beats $60,000! ha ha!

this goes down the rabbit hole on rotating mass
http://www.w8ji.com/rotating_mass_acceleration.htm
http://www.w8ji.com/rotating_mass_acceleration.htm
Last edited by BSmith79 on Fri Nov 10, 2017 9:05 am, edited 1 time in total.

BSmith79
Posts: 46
Joined: Sat Oct 07, 2017 12:14 pm
Your car is a: 1979 124 spider 2000

Re: Spider weight loss plan

Postby BSmith79 » Fri Nov 10, 2017 8:47 am

that was assuming 80 hp at the wheel

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chrisg
Posts: 606
Joined: Sun Jun 04, 2006 7:30 am
Your car is a: 1971 FIAT
Contact:

Re: Spider weight loss plan

Postby chrisg » Fri Nov 10, 2017 9:58 am

This is always interesting. I enjoyed reading it because I'm a long-time cyclist who became a road bike racer and definitely got in with the whole power/weight gig...and actually did quite well riding a bike that was probably 2lbs heavier (which is a lot when you weigh about 150 & bikes are about 16) than the ones it beat ...it's always a mix of building Power & shedding weight. I'm also interested since I now own the 73 Spider Carl mentioned up-thread...and the whole weight-loss approach is part of why it's an interesting car. He didn't mention it also has ridiculously light for their size Revolution wheels! Anyway, I could imagine even getting into doing things like cutting out extra metal and doors frames behind the hood and trunk lids, etc. I like the idea and I suppose as an engineer, the challenge of taking a marginally quick car and making it better is more fun than jumping into a whole new quantum with a major engine swap or a different car...are usually get a chuckle when I hear people talk about making their vintage competitive with modern cars. Perhaps that is a point in some cases, but for me making it competitive with its former self is what is interesting.
Chris Granju
Knoxville, TN
'71 FIAT 124BS (stock, pretty), '72 FIAT 124BC,'76 FIAT 128 Wagon (rat rod), '85 Bertone X 1/9 (FI, efficiency machine) '70 124BC (project,project), 79 X1/9 (hot rod in rehab), '73 124BS (2L, mean), '74 124 Special TC

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81SPIDERMATT
Posts: 1202
Joined: Mon Oct 11, 2010 5:10 pm
Your car is a: 1981 spider 2000
Location: FORT COLLINS, CO

Re: Spider weight loss plan

Postby 81SPIDERMATT » Fri Nov 10, 2017 11:00 am

I have also enjoyed this thread and removed my bumpers for looks but swore I could feel a difference... but my most recent differential swap has given me the feeling I like more than anything I have done ... against most of the suggestions on a previous thread I went with a 4.3 rear end when I trashed my 3.9 ... love it and thinking going back would just seem like I slowed the car down ...but I spend most of my time in those mountain twisties and judge things by the seat of my pants for sure ... Matt

QuebecFiatSpider
Posts: 22
Joined: Thu Jun 29, 2017 6:02 am
Your car is a: 1980 Fiat Sport Spider 2000i Pininfarina

Re: Spider weight loss plan

Postby QuebecFiatSpider » Mon Nov 20, 2017 7:35 am

81SPIDERMATT wrote:I have also enjoyed this thread and removed my bumpers for looks but swore I could feel a difference... but my most recent differential swap has given me the feeling I like more than anything I have done ... against most of the suggestions on a previous thread I went with a 4.3 rear end when I trashed my 3.9 ... love it and thinking going back would just seem like I slowed the car down ...but I spend most of my time in those mountain twisties and judge things by the seat of my pants for sure ... Matt


That is the kind of information I like to read :)

As I am progressing on my Fiat improvement, here are some additional weight numbers :

Image

Image

weight reduction of 1.8 kg. (3.96 lbs)

ORFORD2004
Posts: 779
Joined: Wed Mar 17, 2010 9:48 pm
Your car is a: 1983 PININFARINA
Location: Sherbrooke, Qc, Canada

Re: Spider weight loss plan

Postby ORFORD2004 » Mon Nov 20, 2017 11:32 am

All the changes that I made was for the look or reliability not for weight loss plan. Why do you use a aluminium brace for your fan? You should use the system with tie wrap in the rad. Your fan will be closer to the rad and you will save half a pound. You can leave your wife home for bigger weight loss but you better put more power :lol:

QuebecFiatSpider
Posts: 22
Joined: Thu Jun 29, 2017 6:02 am
Your car is a: 1980 Fiat Sport Spider 2000i Pininfarina

Re: Spider weight loss plan

Postby QuebecFiatSpider » Mon Nov 20, 2017 3:29 pm

ORFORD2004 wrote:All the changes that I made was for the look or reliability not for weight loss plan. Why do you use a aluminium brace for your fan? You should use the system with tie wrap in the rad. Your fan will be closer to the rad and you will save half a pound. You can leave your wife home for bigger weight loss but you better put more power :lol:


It is the Bracket sold by VICK AUTOSPORTS. I just decided to use it...I'm not a big fan of plastic hardware...I prefer that kind of assembly that is just me...:) I'm improving airflow efficiency and reducing weight at the same time...+ replacement by parts that will never rust again....so for me it's Worth it...


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