CLass of 1

I have searched a few times for this answer and I can never seem to find any definitive information, nor logic to explain it. According to all the info found online, SC3’s average about 100 pounds lighter than SC4’s do. But, why?

It’s a well-established fact that the all-alloy 1UZ is lighter than the cast iron block equipped 2JZ. So, if the engine is lighter and both cars can be spec’d with a Nakamichi sound system and share seats, suspension, brakes (in later years) and virtually all other components, why are the SC3’s still “lighter”? It really boggles my mind.

The single greatest contributor to weight is typically the drivetrain. But, the SC4’s drivetrain is lighter, so what gives?

My SC4 came in at 3,683 with all fluids and a full tank of gas. This is a ‘97 and (was) completely stock. In other words, the very definition of “curb weight”. What am I missing?

Nick

t2d2

iTrader: (8)

Exhaust, two banks vs one.

It's been discussed before.

CLass of 1

I have looked everywhere and never found that rationale. That does make sense. A second catalytic as well, huh? I haven’t removed the manifolds so I can’t speak to its weight, but is that the 90-100 pounds I’ve been asking about? Seems a bit much for an exhaust manifold and a catalytic but I suppose it’s certainly possible that it’s all there.

Thanks t2d2.

Nick

t2d2

iTrader: (8)

There were a few other things mentioned (bigger brakes, possibly larger fluid capacity), but exhaust was the main thing. The piping isn't too heavy, but stock manifolds certainly are. Of course, that's 2x4 instead of 1x6, so only ~half of the additional manifold is extra weight.

CLass of 1

Yeah that was my feeling as well, regarding the manifolds.

Thanks clearing that up.

Nick

1997Soarer

iTrader: (1)

Yeah a few things that stick out in my mind:
-Both have 2 iron exhaust manifolds but by design each UZ bank is near twice as long as 1 bank of 2JZ upper manifolds. While the JZ cat converter is physically bigger, it acts as a merge so it only has the same material as one UZ cat. Then you have a bit more exhaust piping (the Y-pipe).
-Bigger brakes. The calipers and rotors are a bit bigger at every corner
-I hear the hydro fan weighs a as much as the clutch fan setup dry; the fluid just adds more weight
-A V8 holds more coolant than a I6.

I would not be surprised if those differences altogether add up to 100 lbs

Teal Sc400

Minor stock items available in the 300/400 add up such as the size and weight of the pioneer amp compared to the nakamichi.

t2d2

iTrader: (8)

Uh...isn't Pioneer base and Nakamichi the upgrade option on both cars?

Teal Sc400

for sure not in earlier Sc 300/400 models not sure on later models sold in the U.S.

t2d2

iTrader: (8)

My '94 SC400 came with the Pioneer system, so at least by year 3 it could go either way on the 400s. I haven't paid attention to the stereo configuration by year/model on other SCs I've seen.

Teal Sc400

O’Tay! I’ve never heard of a stock Sc400, with a Pioneer system and or the previous owner might have replaced a damaged OEM Nakamichi head unit? This reminds me of the rear spoiler standard on the Sc400 and not for the Sc300.

t2d2

iTrader: (8)

Nope, not that easy. Speakers, amps, wiring (?), all Pioneer-specific. No one would have gone to such lengths to replace it with a lesser factory system.

I also had a '95 SC400 parts car with Pioneer system.

1997Soarer

iTrader: (1)

I think Pioneer was standard in both 300 and 400s but only 400s got the option of the Nakamichi

t2d2

iTrader: (8)

That would make more sense. Unless someone knows of a SC300 with Nakamichi system, that theory will hold water.

ThomasGS4

iTrader: (19)

It was a standalone option, but most 300s were ordered without it. You could special order your SC with it if you so desired.