I've been thinking about a C4 (not any other generation) Corvette too much lately...

Without triggering fiery brand loyalty related comments, what does everyone think about the quality and merit of the design, the quality of parts, the quality of assembly, the refinement, the reliability, the amount of miles that can be expected before major drive train failures, etc. between the first gen SC (both 300 & 400) and the C4 Corvette?
I already know there are fundamental differences of weight, wheelbase, center of gravity height, etc. What I'm not clear enough on is the overall quality, design refinement, and expected lifespan differences between the two cars.

Thanks everyone.

 

This does a pretty good job showing you some stuff in of the car. From the video I feel like the SC still has better fit and finish but its honestly a lot better than what i expected an old corvette to be.

 

C4's are not as refined and well built as an SC300/400/Soarer but they are also completely different cars. One is a much lighter two-seater with a hatchback and the other is a big, long GT two-door 2+2 coupe with a small trunk.

C4's have much better standard specifications as high performance cars and their LT1's respond well to both naturally aspirated and forced induction upgrades. SC's on the other hand don't start out with great stock performance hardware but their chassis and drivelines are overbuilt so well that they can easily be modified to equal or surpass the raw horsepower that the LT1 blocks can put out... until both blocks get completely built up with aftermarket internals, big turbocharger(s) and insane fuel systems.

All SC's have galvanized steel bodies and thick steel everywhere which makes them much heavier. Corvette C4's have fiberglass bodies but I am unsure as to how well protected their underlying metal frames are.

SC's have excellent four wheel independent suspensions with double wishbones at each corner with long wheelbases. This makes them very stable at higher speeds. C4's I have always understood to have a bit of snap oversteer at the handling limits which was greatly improved on with the C5, C6 and C7 generations. To be fair, with enough horsepower and an LSD you also can experience the tail-happy nature of an SC as well, although I feel you have to be actively trying to make this happen. SC's aren't known to have sudden oversteer surprise moments the way Porsche 911's or SW20 Turbo MR2's do.

The C4 chassis is not as good from a handling perspective compared to a C5/6/7 but aside from the very 80's GM interior quality I've always found them to look very classic cool. Especially the ZR-1, 1996 Super Sport and all the Callaway Twin Turbo C4 Corvettes.

Of course it's also easier to use an SC in most everyday situations compared to a Corvette C4 With upgraded suspension, upgraded brakes, upgraded transmission and whatever flavor of turbocharged JZ engine you want you can have similar power and performance in a big 2+2 two door coupe that you can drive to work, run errands with, get plenty of groceries, take friends with you on short trips or take yourself and a passenger on very long distance drives.

The only big disadvantage that both cars have is that neither gets particularly good fuel economy... but you'd except that with cars like them and any gasoline car that can push big horsepower numbers.

We're of course biased towards SC's here but more than one of our members also owns a Corvette of some generation.

I think that ultimately it's hard to directly compare the two models because even besides the modified performance potential of both chassis they each serve very different purposes and excel at different real world uses by their owners whether 100% stock or very modified.

 

Thank you for your responses; many of my questions are now answered.

I understand that the two cars are fundamentally different designs not meant for the same application, but I would like to hear more about 1st gen SC vs C4 Corvette differences in terms of precision tolerances, metallurgy of parts, thorough and precision design, attention to detail, commitment to necessary design update revisions, good wiring design, etc. You know, all the things that make a car a smart purchase and makes the owner happy and proud of their machine, not so much from a stock vs stock performance perspective, but from a product life and cost of ownership perspective. The opposite of this would be the misery of owning a vehicle that is always failing and breaking. A vehicle where you wonder why the heck they designed things the way they did or why they used mediocre quality parts. I want to drill down into this question and get more clear on this.

I have my suspicions on what is the truth with this question (I currently drive an SC 300), but I would like other opinions on this.

 

^^ A lot of that I addressed in my post above even though it wasn't the overall focus of my post response to your questions but on the whole the level of quality, suspension design, metal quality and strength, paint quality, door hinge design, over-engineering of the engine architecture and electrical system in *good* ways (ie: everything has a purpose and just uses exceptionally good materials aside from a few interior plastic choices) in an SC300/400/Soarer is a lot better than what you'll find in a C4 Corvette.

These cars were designed at a time in Toyota's history when the Japanese economy and company coffers were very much in the black and so the Celsior/LS400 and Soarer/SC especially were built in order to show off to the world that Toyota/Lexus could outdo, among, others, Mercedes-Benz offerings of the day. And... they succeeded. They didn't give us the factory high performance engine option that Japan got but other than that the SC has been deemed the Japanese 8-Series.

The amount of mileage that you can put on an SC400 especially but also an SC300 worry-free... just like the LS400... is incredibly high.

Now, is there both regular and long term maintenance? Of course. Are there a few minor common issues that tend to need reconditioning repair in pretty much every 92-00 SC given enough years of use and mileage driven? Of course. Try driving ANY car well into and past 250k miles or far higher and avoid needing a rebuilt automatic transmission or valve cover job or rebuilt gauge cluster, re-capped ECU, etc. Even Mercedes-Benz cars from the 90's and early 2000's eventually need new capacitors in their ECUs or minor gauge cluster repairs. These are not new cars any longer. Some of them are 30 years old now or close to it.

However despite all of that which you should expect when keeping what is now a classic car on the road, these are at the end of the day 90's high end Toyotas. And as such, they LAST and continue to serve their owners the way over-designed 90's Toyotas tend to.

You asked about the wiring in these cars. The quality of the original wiring in the body and engine harnesses exceeds the design goals for most other cars of their era and even today in some cases. When I converted my 2JZ-GTE engine harness to work in my SC chassis I went and bought a used SC300 Auto harness to cannibalize other harness parts and wires from-- because for at the time not a lot of money I was able to get such high quality copper OEM wiring spares to work with that I'd be hard pressed to find affordably on the aftermarket.

Toyota/Lexus kept these cars relatively simple by today's standards but what you are getting is a very easy to work on, long lasting, high quality personal sports coupe the bones of which were designed to handle three times or more than their stock horsepower with zero compromises to long term reliability.

I love Ford Fox Bodies and GM G-Bodies as well but compare the SC's chassis and suspension design to either of those cars which tend to need some major aftermarket reinforcing to handle three times their standard factory horsepower. Not to mention the quality of the metal, paint, body materials, etc.

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I've owned my SC for 12 years now as my daily driver and started with it at 189k miles on the odometer. It needed a lot of upfront TLC but after that was very reliable. I've had a couple of surprise downtime episodes on rare occasions (one of those times was related to needing to repair something to pass California smog inspection) but there was always a solution to get the right parts needed and get it back on the road.

The only other recent downtime for my SC was when I pulled my old engine out in order to swap in a 2JZ-GTE that I was building to go in. I did most of the swap job well but since I had never done such a job before I made a couple of rookie mistakes and had to correct them as I figured out what they were and found solutions. After ironing out those minor mistakes it's been exceptionally reliable again as a daily driver.

Now out the box I personally feel there are several areas of the car that need improvements but 100% of those go-to improvements are extremely common upgrades and 90% of those upgrades *can* use all OEM parts that were designed for this chassis architecture. Given all of that I do not feel anything in terms of long term reliability is given up when you modify these cars in a smart and thorough way.

The 1UZ-FE V8 engine in the SC400's so far holds the record for the longest lasting of the two engine options between rebuilds but the 2JZ-GE is no slouch in this area. Technically the 1JZ-GTE and 2JZ-GTE engines and any NA-T 2JZ-GE engine will not last quite as long as both naturally aspirated UZ and JZ engines because forced induction does stress the engine more... but these JZ engines were designed from the get-go with forced induction through turbocharging. The 2JZ-GE engine variant was developed *after* the 1JZ-GTE and 2JZ-GTE designs based on their already extremely tough architecture.

And the bones of the 1UZ-FE V8 were actually designed around the specifications for Toyota's CART (Indycar) race engine of the 1980's. There was tremendous money and R&D spent on refining that engine before it debuted in the 1989 Celsior/LS400.

https://www.autoevolution.com/news/t...8s-176248.html

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The advantage that the C4 Corvette might have on the SC is in its layout and weight distribution and its overall lighter curb weight. However I think it wasn't until the LSx T56 Corvettes that fuel economy dramatically improved.

Again with the "they are totally different cars" argument... the Corvette is a "sports car" while the SC is really a "luxury muscle car" that, with upgrades, handles and stops like the best of them from its era and beyond.

The SC300/400/Soarer is a very high quality, over-engineered car that actually has all the built-in capacity to be made into a much higher performance car than it is in stock form. Its weight and long wheelbase is somewhat a disadvantage when compared to something like a Miata or even a 2020+ Supra MKV... but even so it's similar in weight to a 2022 Mustang GT and its wheelbase is similar to the '22 Mustang's wheelbase.

I'm not giving nearly as much focus here to the Corvette C4's positives and negatives but admittedly I don't know those cars as well as I do SC's. However from the Callaway and ZR-1 era onward that generation of Corvettes does make a cool impression on you no matter what flaws it has, so iconic is it in people's minds.

 

KahnBB6, a million thanks!!!

Your thorough explanation on the subject of SC design and build quality merit, in my opinion, has just had an absolutely massive effect on the respect that this car deserves. Your replies to my question have been of the highest quality and restores confidence in the whole original intent and point of internet forums. It's the rare, eloquent, professional, knowledgeable, honest, and thorough forum post, such as yours here, that offsets, no slays the troll and quasi-troll useless, annoying, topic-fouling dross that unfortunately populate many internet threads.

I'm sure you've said these words elsewhere already, but it's my opinion, that simply with the power of only two correctly and smartly aimed posts, your effect on the perceived value and pride of ownership of these cars will be very significant in the years to come. For your posts here you are deserved MANY thanks from the Lexus community as well as those considering a Lexus purchase for the first time. THANK YOU!

 

Craig couldn't have said it any better. As you can tell, many of us are very passionate about these cars. They have an incredible history and the amount of time, effort, and pure passion that went into the SC design and engineering is simply un-matched by cars of that era. Hopefully you find your way into a car that you love and feel free to post any questions that you may have!

 

MassOut-- You're very welcome! I just aim to give informed information and opinion and convey experience whenever possible. I truly hope you've got a better scope on where you stand with your SC300 and how you feel about it. There is no one way to enjoy these cars and also *you* are the only person who can decide if it's the right car for you But if you give it a chance I think you'll find that it's a great vehicle that can check a lot of boxes at the same time.

Also I completely forgot to highlight the SC's shared DNA with the 1993-2002 Supra MKIV (which was designed after the SC/Soarer while using its platform as its own starting point) but that's information you can easily find or which you're probably already aware of.

And at the end of the day there's no reason you can't have both an SC *and* a C4 Vette together to enjoy if both cars speak to you for different reasons

Rudy-- Yes, I think we're all very passionate about our SC's. The SC/Soarer isn't the only car of its era that inspires our level of passion, dedication and love for the platform but it's a very special one among them and yes, VERY over-engineered in the best of ways and given timeless styling.

 

c4's are literally one of the worst cars to work on period. The Sc has more space everywhere. I work at a racecar shop and hate it when i have to work on a c4, literally **** engines, **** transmissions, **** rear end, really bad dash/hvac control system, bad latch hood system literally everything is bad about c4's. nothing upgrades easy like the 2jz on the sc300s

c6+ completely different story still hard/pain in the *** to work on but the performance is there at least.

 

What’s your opinion on the C5? I always wanted an FRC since they were cheap.

 

kinda inbetween, much better than a c4 has an engine u can upgrade easily, trans holds power so does rear end. just not as good as a c6.

 

That would be SC for me every time, 300 or 400 either one really. I mean maybe a C3 but not because they are more refined or faster or reliable... cause they aren't any of those stock but they are alot of fun

 

scsexy is 100& right. The car was built during the years GM had lost its way and was building crap, actually wound up in bankruptcy. They were so stupid the Corvette was slated for elimination, saved at the last minute

I owned an early C3. 69-350/350 T top. The Mako Shark years. Beautiful well built Hot Rod. Actually drove it from George Washington Bridge to the Golden Gate Bridge NY-Ca. GM was still building exciting cars. Never had a problem.
Own an SC400 now. Have had it for 20 trouble free years, and enjoyed it to the "Max" in everyone of those yrs, a lot of fun. Can't imagine a more dependable car on the planet! The problem is its 30 yrs old and how long can it go on. I think most of us owners are running in to the Big problem of finding parts for the car.

If I had to get any other car it would be a C5. To me its a beautiful car with all the power and handling I need, I would Love that car. But My love is my SC and I'll just ride it out to the end. Leno has a Leno's Garage show on his I believe 99 blue C5. I recommend it to everybody.

And you'll be able to get Corvette parts (if you don't live in Cal) for the rest of your life

 

here's my vette and SC in the same picture. Vette was the biggest POS I've ever owned and it was a mint condition model. 0 of 5 stars never again.

 

Yes, and I believe your vette is the C4 we are discussing in this thread as being a POS
You might want to read my post up above
"Leno has a Leno's Garage show on his I believe 99 blue C5. I recommend it to everybody."
Joe