The alltrac weight reduction thread

Suspension and other discussion

Postby Griffin » Mon Sep 13, 2004 5:34 am

Check this out - finally took the A/C evaporator out this weekend - it was 11 pounds! I could not believe it - I htink a lot of it was the dirt on it, but even so that evaporator core is huge and heavy.
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Postby Sifu » Mon Sep 13, 2004 11:19 pm

I second the notion of finding all the total weight of parts from our beloved Alltracs.

And to make it easier, I'll start. Someone should bust out a pen an paper so maybe this list can be collaborated and permanently placed somewhere useful.

Weight (pounds)
Speed Sensor Acutator: 2
Rear Jack: 5
Speed Control Box: 1
Rear Tire Mat: 2
Spare Tire: 37
Trunk Cover: 5
Passenger Glovebox: 5

I'll be taking some other things off. I'll post those if anybody is interested.
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Postby CMS-GT4 » Tue Sep 14, 2004 1:32 pm

Stock downpipe w/ heat shields is 25lbs.

BTW: That is a good idea. If anyone takes anything of weight it and post it.
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Postby RedCelicaTRD » Tue Sep 14, 2004 10:49 pm

A company name ACPT supposedly makes a carbon fiber drive shaft for the ST185. Not sure on the weight.
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Postby alltracman78 » Tue Sep 14, 2004 10:53 pm

If it can be found, I bet it would make a HUGE reduction in parasitic loss.
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Postby furpo » Fri Sep 17, 2004 2:54 am

i weighed my air con when i pulled it out of my gt4. the pipes, radiator, wires, mounts, ducts and fan weighed 27kg. i took the pump off later, it was not as heavy as i expected it to be. it was only 4kg. the bracket was 2kg and the idler bracket was 3kg. so all up it was 9kg.


i got a alt bracket off a non air conditioned 3sfe. and the belt i use was off a 4age. i have some photo's of how i did this if anyone wants to know.

also i have noticed alot of brakets that can be unbolted because they don't appear to be for anything. i assume toyota made one basic body that they could bolt an optional extra too.

there is a 4kg bit off lead under the front bolted to the cross member as well.

i am building a carbon fibre strut brace so ill let everyone know how heavy the factory one is when i pull it off. the carbon one is 900 grams 8)

my old gt4 was called a rally and was a bit lighter. it was 1310 kg with about 1/4 tank of gas. the one i have at the moment is 1370 kg with the heavy electric seats.

you should have no problem getting down to 1250kg (2750 pounds) if you go the whole hog. i think i remember reading that the wrc celicas were 1200kg.

also the abs unit is 9kg

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Postby furpo » Fri Sep 17, 2004 3:33 am

sorry guys my memory is wrong again.

http://www.rallycars.com/Cars/Toyota_GT ... ST185.html says that the st185 was 1380kgs fully laden. the dry weight may well have been 1200kg. 180kg sounds about right for two people, fuel and spares. can anyone confirm?
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Postby furpo » Sun Sep 19, 2004 4:40 am

i pulled the glove box out today and removed the air con unit out behind the dash, it was about 2kg. i didn't bother weighing it. the fan and heater radiator was about 10kg.

in the diagra, above what are part numbers 89230 and 82670A? i unpluged them but nothing stopped working so i was woundering if i need them.

the black box in the picture with the glove box i found under the fan. i wounder what this does as well cos it didn't seem to do anything.

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Postby alltracman78 » Sun Sep 19, 2004 1:36 pm

The "black box" in the pic is the cruise control computer.




If you go all out on these cars, and remove all the extra automated crap, you shouldn't have too much problem going under 2800lbs.
That's just my guess after ripping the cars apart.
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Re: actual savings

Postby allblackalltrac » Tue Sep 21, 2004 3:32 am

lamard wrote:also if anyone has pics of their stripped car please post them.


ask and ye shall recieve...
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the sound deading stuff on the floors weighs in at 45lbs once its all chipped out
the rear hatch with everything attached weighs 55lbs
seat belt restraints weighs in at 20lbs

apart from what was already mentioned I'd like to add:
pull all the glass and replace with Lexan
make the rear hatch fibreglass
drill really big holes or remove the inner section of the boxed re-bars
fuel cell
gut the lights w/motors
gut as much of the doors as structurally possible or gut them completely and weld them shut (would necessitate roll cage)
get rid of the sunroof and weld the skin shut
steering column
1-piece front end made out of FG or CF
all this is to the extreme and would only be benificial to a full out race car...

keep in mind however that it is not nessessarily the weight of the vehicle so much as it is the 'un-sprung weight' that determines the cars steering and suspension characteristics.
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Postby BraveUlysses » Fri Oct 01, 2004 8:24 pm

CMS-GT4 wrote:Anyone got the weight of stock wheels/tires?

If I can this CF RC hood thing going, I will weight the stock cs hood when I take it off to be molded.

As I take off stuff over the next bit, I will weight it and post weights.


Stock wheels and tires are in the 40-45 lb range each.
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Postby CMS-GT4 » Tue Oct 05, 2004 12:36 am

Fuel Tanks weighs 25.35lbs.

There is some weight to be saved for a smaller gt tank or fuel cell.
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Postby Midnightracer22 » Tue Oct 05, 2004 2:20 pm

Rebuilding the YJ from the (sand in the) frame up
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Postby CMS-GT4 » Fri Oct 08, 2004 2:18 am

I wonder how permitted a cf roll cage would be? I bet I would have to stick with steel.

I am going to have to add one at some point, but I prefer to add as little weight to the car as I can. I am trying to reach that 2,800lb goal when the car is done.
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92 st185 (205 swap) | 03 350Z Track (sold) | 13 Pilot | 17 Mazda3
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Postby furpo » Tue Oct 12, 2004 10:17 am

hi there savage.

im in wellington at the moment at uni. i will be in auckland working at c-tech after uni finishes in about 4 weeks time. i have finished my cold air box and cut it to shape but have not clear coated it yet. it all seams to be working ok. 1400 kg took a bit of getting a custom to for me as well. i was driving around my race car before that which is a 600kg mini.

ok i have had an idea. i moved the radiator over flow bottle because i did not want hot water splashing over the carbon fibre air box to the fire wall. i noticed that it is quite heavy and a really silly shape. so does any one know what car i can find a small, well shaped over flow can in? also the steel bracket can be cut off if the over flow bottle is moved.

the charcol filter is about 1 kg. the bracket holding it is about another 1kg. the over flow bottle is about 5kg fill of water. the positive and negative power cables are about 500 grams together. so now my car is another 6 ish kg lighter.

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