Weights of different Sigma's

[gareth12]

Hey, i called the RTA tech line today to get a weight for a Sigma, they were unhelpful and vague as usual but said the weight would be 1170 for conversion purposes, i have higher numbers than this so was a bit confused.

Can anyone clear up weights of different sigma's from 80-87. For conversion purposes it has to be the sedan model with the largest capacity engine fitted but without optional extras like AC and towbar. Sources for these weights would be great too.

[GB_BB4C]

GK (J and N should be about the same) this is with 2.6lt motor.
Sigma GL
H line Auto - 1158
H line Manual - 1151
Sigma SE
P line Auto - 1178
P line Manual - 1172
Sigma Super Saloon
X line Auto - 1223
X line Manual - 1229
Sigma GSR
S line Manual - 1180

[gareth12]

thanks! i suppose GH is about the same? My googleing said 1195kg (or 2635lb) for pretty much all from 80-87

this is peeing on my LS1 parade! lol

[GB_BB4C]

GH 2.6

GL Auto - 1141
GL Manual - 1137
SE Auto - 1158
SE Manual - 1161

[gareth12]

ouch...

[gareth12]

GE GSR weigh any more?

edit.... there wasn't one was there... hmm

[GB_BB4C]

*note: these are the weights out of the book with whatever options were standard on them, minus optional extras.

only a GJ and GK had a GSR

[gareth12]

looks like GH would be out for a 5,665 cc LS1 in NSW with current VSI 06 laws... wonder if we will ever get NCOP

[gareth12]

can you confirm J and N are the same? appreciate it

[bruggz351]

Remember though, you cant cheat it by trying to use a different, heavier model. RMS use the base model with auto, if an option, with spare and all fluids. Doesn't matter if the GSR model weighs 100 kilo more, they will still go off the weight of the base model in auto.
I found, when putting a V8 in my Cortina many moons ago, that the then RTA only use the sedan variant also. I was putting the V8 into a wagon, which weighed considerably more than the sedan but had to use the sedan weight to decide the capacity of the motor.
Their reasoning sux...

cheers

[gareth12]

i know about the sedan/wagon thing, but i didn't know they used the base model, they don't specify that in the VSI 6. Some base models on other cars would not come with the largest engine option surely?

NCOP they say the heaviest sedan version without extra options... stupid NSW......

[GB_BB4C]

Don't have a GJ or GN manual... sorry.

[bruggz351]

i know about the sedan/wagon thing, but i didn't know they used the base model, they don't specify that in the VSI 6. Some base models on other cars would not come with the largest engine option surely?

NCOP they say the heaviest sedan version without extra options... stupid NSW......

Sorry, didn't mention the largest engine option. Like I said, it was yonks ago I was playing around with conversions..

cheers

[gareth12]

Yeah that must have been your engineers interpretation perhaps? most basic model with the full size engine?

Think i might ring mine tomorrow and see what he says the conversion weights are for the sigmas. Like i say the guy at the rta was vague and would not give me the accurate number 1170 ish was the best he would give me, then went on to tell me no engineer would work with me if im getting towards that limit... Pfff

[bruggz351]

Yeah, definitely speak to ya engineer eh.
RTA are a bunch of knobs I've found.

I've never been able to get anything remotely useful, info-wise, out of them.

Good luck though, sounds like a sweet combo.

[gareth12]

1170 for 80-84 1130 for 85+.... sure the numbers posted here are far more accurate, the engineer is sussing it out.

1170 leaves me 6kg short of a legal ls1.... argh! If he comes back with bad news i might have to wait for NSW to adopt NCOP...

[InsaneTD]

How do they figure the engine in? It's kw? Maybe use a downrated ls1 if you have your heart set on it? I've heard ideas for other v8s being put into sigmas. Toyota, ford, dodge, etc.

[gareth12]

funnily enough its not KW which would make perhaps more sense, its engine capacity, based on weight of the vehicle

for a 1100+kg vehicle in NSW thats not got a full chassis the modifier for naturally aspirated engine in cc's is multiply by 4.82 to find maximum capacity

there is an LS engine that has a destroked crank for 5.3 capacity but its not what they have used here in the commodores, they are 5.7+, so theres a lot of cost and hassle there to end up with something thats not brilliant. I looked at the ford 5.4 litre xr8 motors but just not feeling them. So much support and info for the LS chev/holden motors out there now. They make nice power, start cold happily, have an alloy block and are reliable. What more could one want?

anyway spoke more to the engineer and he says the weight for the sigma he has would be 1200kg... Not sure how he got to that, dont care lol.... more than enough

Game on...

[BAD-SIG]

After looking extensively through many many old books and car magazines in my collection, here is the weights I found, sorted by year of manufacture:

1978 GE Sigma GL 1.6 4spd manual = 1096kg
1978 GE Scorpion 2.0 5spd manual = 1148kg
1979 GE Sigma Wagon SE 2.0 5spd manual = 1145kg
1979 GE Sigma SE 2.0 3spd auto = 1115kg
1979 GE Sigma SE 2.6 3spd auto = 1141kg
1979 GH Scorpion 2.6 5spd manual = 1148kg


1981 GH Sigma GL 2.0 5spd manual = 1112kg
1981 GH Sigma Turbo 2.0 5spd manual = 1110kg
1981 GH Sigma GLX 2.0 4spd manual = 1030kg

1982 GK Scorpion 2.6 5spd manual = 1195kg
1982 GJ Sigma GL 1.6 4spd manual = 1132kg
1982 GJ Sigma SE 2.0 5spd manual = 1137kg
1983 GJ Sigma GL 2.0 4spd manual = 1132kg
1983 GJ Sigma SE 2.6 5spd manual = 1167kg

1984 Cordia GSR Turbo 5spd manual = 1030kg
1985 Cordia GSL 5spd manual = 965 kg

1986 Starion 2.0 Turbo 5spd manual = 1265kg

1986 GN Sigma Wagon GL 2.6 5spd manual = couldn't find exact weight, but Wheels says that it's 54kg heavier than GK 2.6 sedan, which makes it about 1250kg
1986 GN Sigma GL 2.6 5spd manual = 1195kg

1986 Magna Elite 2.6 4spd auto = 1278kg
1987 Magna GLX 2.6 5spd manual = 1222kg
1987 Magna SE 2.6 MPFI 5spd manual = 1246kg
1987 Magna Wagon SE 2.6 MPFI 5spd manual = 1350kg

Can we put these on the first post and make this thread sticky?

[gareth12]

Thanks for that, its a great list

[amgis_obrut]

Sigma Turbo 1195 kg
GH SE 1151 kg

form factory workshop manual

When I was gaining approval to do a V8 conversion on my GH the only weight the engineer was concerned about was the heaviest of the range (turbo @ 1195kg) and worked out engine capacity from that

[gareth12]

Cheers,

Been talking the the engineer, being there was a lot of conflicting info he was happy with 1200kg as a conversion weight, so that leaves me in good stead

Been sketching out brake conversions, tossing up 4 stud/r31 diff disc rear/drilled blank discs + modern calipers front with 15" r31 chasers or hilux diff drum rear/XA or conversion hub and falcon discs and caliper front with AU falcon chasers. Probably VT master and maybe booster on the first (if it fits) or maybe XB on the second.