What changed from '79 to '80 to add 200lbs and only 5hp?
 

78 911SC 3.0 175 2560
79 911SC 3.0 175 2560
80 911SC 3.0 180 2760
81 911SC 3.0 180 2760
82 911SC 3.0 180 2760
83 911SC 3.0 180 2760
http://www.pelicanparts.com/911/technical_specs/911_guthrie_faq.htm

One thing, I think, is that AC became standard equipment. So it was added to the baseline weight.

BTW, if you are talking about US cars, the factory HP number never changed at all from 78 to 83.

The US SC was always listed at the same hp, from beginning of production to the end.

hp was 180 all years for US spec. Intake runners got smaller in 80, but compression went up and emissions system changed.

As for weight, it depends on options. All of the published weights are to be taken with a grain of salt. I can tell you that my 79 coupe with AC, sunroof and electric windows weighs 2660lbs.

Yes, hp was the same 180 for the five years of SC production, but do to the smaller intakes and higher compression in the '81-'83 years, the torque was higher. 203 lbs @ 4200 for the early engine, 219 lbs @ 4200 for the later.

That's 180 DIN HP. Those are smaller horses that SAE.

SAE was 172 net HP for all US SC's, but the torque was initially listed as a higher number, 189 ft-lbs. By 82 the HP was still listed as 172, but the torques was listed at 175 ft-lbs.

My belief is the HP actually dropped slightly in 1980 when Porsche switched from the big ports to the small ports and they reindexed the cams for more torque and better gas mileage in the US. All of the contemporary US magazine tests had slightly slower acceleration times after the 79 model year.

Regards,

Jerry

I thought DIN horses were more powerful than SAE? Any one?

Personally, I have never weighed an SC that turned in weights as high as 2700. Most weigh in at around the 25's. That's with AC. It must be noted that the figures back in those days for not just weight, but hp as well, were far from accurate. After all, my 80SC with puts out around 175 to the rear wheels at just under 220,000 on the motor. Also, my SC, which is stripped, weighs in at 2250. Even though considerable weight came out of it, I know it wasn't a whole 500 pounds.

The answer to the original question is that Porsche, at least in the US, made several items that were options in '78 & '79 standard equipment in 1980. These included A/C and power windows as well as several other smaller items. That would explain at least some of the weight increase.

My '83 SC with a/c, sunroof, and a half tank of gas weighs 2,723 lbs.

Wasn't that the year that McDonald's began supersizing? :cool:

I have no idea where he got those weight #s, but they are wrong. And if you read a little more carefully, he lists HP the same for all SCs, (180), but torque goes up from 175 to 180 in 1980.

Which is also incorrect, according to factory figures. Jerry's figures are the correct ones, 189 lbs. of torque for 78-79, and 175 lbs. for 80-83. All 911SC models were rated the same HP, (172 SAE/180 DIN), so for comparison to other U.S. figures the 172 HP is the apples/apples #. DIN ponies are slightly smaller and weaker, underfed European horsies as opposed to corn-fed U.S. horsies.

And the weight figures for the early SCs are simply a mis-print or mistake. 2560 would be for an average equipped '72 model, if you don't believe me, read the '72 road test that Warren just posted. A/C does not weigh 200 lbs., (I wish), and they never published different weights for every theoretical option combination. :rolleyes:

Hope that clears things up. :cool:

With all said with regrad to the SC, would a '78-79 have better track performance ... all else being equal?

There were are few cars every made that will better a '79 on or off the track :)

One would be any Carrera.

I thought US SC's went from 180 to 188 for the last couple of years.

nostatic, how did you choose to weigh your car? I would be curious to know what mine weighs.

Thanks!

And as far as hp, something must be wrong with my SC because 175 to the rear wheels with 218,000 miles on the odometer, it is putting out more power than it should be.

Nope.

mine was weighed during corner balancing at TRE. And I'm pondering ditching the AC, although maybe I'll wait until after summer.

Well i doubt the ac weighs that much as well, but i think it's still significant and this is why. After putting my motor back in the car, my car actually sits higher in the rear than it used to. When i took it out, it was a perfectly stock motor in every way with AC. Since then i've back dated the exhaust, ditched heat and AC. Before taking the motor out, the previous owner had lowered the car to the point where the top of the rear tires would be flush with the top of the rear fenders. Now, making sure to push the back suspension down a few times times so that it isn't caught on something, it sits about 1-1/2 higher than it used to, go figure.