safulop

So, a friend of mine is a local investor. He invests in all kinds of things, including a pistachio farm, antique gold watches, and yes, cars. Among other investment cars, he bought a Ford GT brand new in 2006 and has watched its value soar to around $500K. He had a 1987 928S4 once upon a time which I bought; sadly that car burned up in a fire 3 weeks after I bought it but we still chat about my current 1988 S4 model. I've been contemplating upgrades such as a major supercharger etc. but he recoiled in horror. He suggested that, whatever value my car has, it would be diminished by aftermarket modifications. My opinion is that in the 928 world that is not the case. Personally, I will not buy another 928 unless it is supercharged. What do we think about this?

SeanR

I'd not worry about what others think about what you do to your car. Do what makes you happy.

Tony320

I can only answer anecdotally that the last car I looked at was a gen 1 cts-v, which had been equipped with a Magnusson s/c kit. I did not buy the car, and the deciding factor was the s/c. I just couldn't pull the trigger on a car making 25% more power than it was designed for. Maybe I could have had the build been documented, but that wasn't the car I looked at.

Generally speaking, I want to be the one to mod my car because then I know what has been done, and just accept that it likely reduces the value.

James Bailey

He is very correct about aftermarket modifications. Especially on higher value cars. The 928 was for so many years worth so very little that adding a blower for many increased the perceived value. Never by as much as the blower cost however.
Best example might be the early long hood 911s it was common to flair and update the hoods and bumpers....now original cars are easily worth twice as much !! as a 1967 that LOOKS like a 1989.
But as Sean suggests do what you wish with your car because who knows what if any value "collector" cars will have in the future. It is nearly impossible to guess what cars will be hot and which will not. As a general rule cars are very bad investments. Most are liabilities rather than assets.

dr bob

Buying a car to park it has seldom been a good investment. Other are a few notable exceptions, but just a few. Unless you are amazingly clairvoyant, cars are right up there with powerball tickets.

Meanwhile, if you want a fast car, buy one that was factory-fast. If you want a faster car, buy one that was factory faster. They are cheaper to buy and worth more to sell when the time comes, because the 'faster' part and the reliability is already documented independently. With a one-off supercharged car, the only market is with someone who is looking for your car and knows exactly what you did and exactly what it needs. Can be limiting. Want a fast car to just drive and not worry about? Supercharged 928 doesn't make a blip on my radar scope, unfortunately. Know a perfect one you'd like to own? Go for it.

In the history of your car, there was a Murph kit that sat next to the car in Rolf's garage for a while. He was pretty serious about grabbing the extra performance. Would you have bought the car for the same $$ if that had been installed? He didn't think the car would be as valuable, so the kit moved on to a new owner separate from the car.

----

I cherish my car's originality, reliability, etc., and consider those things significant parts of its value. It would be faster and undoubtedly more fun to drive, would add $$ to the cost while subtracting $$ from its value. IMO anyway.

safulop

For my money as a 928 buyer, I would consider a well-installed supercharger a bonus and I would pay a premium for it, just like you would for perfect paint or a 5-speed. Not only would I have bought this car if it had the murph on it, I probably would have been super thrilled to get it for the money I paid.

The truth is for now, I'm just going to try Porken's new chips. I'll be glad to get these Autothority clunkers out of here.

Bob in Socal

I got it all wrong? This is not an investment car.
Supercharge it!

Alan

As an investment in $$ major modifications are almost always a bad idea

As an investment in fun it may be a different answer - but you do have to convince yourself that the installation was done well and that the equipment installed is appropriate & reliable. Even then - for such a car - where will you take it when you need to get it fixed - or can you really do it all yourself?

Alan

Wisconsin

I guess it comes down to what your expectations are. If you are viewing this car as a serious investment then keeping it original will return the best money more times than not. Personally having an aftermarket SC on a car would scare me as a buyer thus reducing value and limiting who will pay top dollar for it.

This comes down to what you want out of this investment. Personal preference.

Ninespub

I thought about supercharging my 928 a couple times, especially after riding in Andrew's 91GT twin screw. What a screaming beeotch of a car. Of course, AO recently has had a few issues with it, ultimately requiring a lot of downtime and a full rebuild, I think, of the block. I think his grins per mile is/was worth it to him though, and I can understand why.

I bought a factory-supercharged '05 Jaguar S-type "R" sedan for 10 grand that is exilarating for a daily driver and I'm lovin' it. The suspension and brakes were factory modified to match the performance and it gives a great ride for a little money...probably only a couple grand more than it would cost to SC the 928. At the end of the day though, I know I will probably have to do an intake, hoses and supercharger rebuild on the Jag in the spring and that it will probably fall into a $3K expense at a minimum; but was a known (and researched) factor when I bought it. Insofar as to the CTS-V, that is a another screaming ride for a sedan, although whether Cadillac properly redesigned the rest of the platform is an unknown.

Bottom line IMHO, there is "limited" financial appreciation for 928s in the visible future unless you have a pristine GTS, so its your car and the question is how much fun do you want to have for the dollars you spend on it. There are millions of people who spend $3-5000 annually golfing, bowling, hunting and fishing and twice that amount boating. Enjoy your 928 YOUR way!

bureau13

With rare exception, if you're buying one of these cars as an investment, your logic is already questionable. If you install the kit, it MIGHT increase the value when you sell it if you find the right buyer, but it will drastically decrease the pool of prospective buyers, especially at the increased price you'll likely be asking. I say supercharge it if you want to as your driver, I'm sure you've already lost money as an investment. I know I have, and I couldn't care less, honestly.

boomboom

Put the SC on the car and enjoy it. My car now runs with and in some cases is faster than many new cars with superior horse power. The power band is much better and it just runs great. I bought my car with the ultimate intentions of making more power and able to hang with the high horse power new cars. It does that now and looks so much better too. It just feels better to have a much more responsive motor.

I put the Rotrex SC on mine with only 6lbs of boost. Plenty of power with little worry of damaging the engine. No need for intercooling either. I continue to make minor modifications such as a one piece charge tube and oil separator. Just purchased a Sharktuner and will continue to tune accordingly.

Just make sure everything is in good condition before doing any modifications.

dr bob

The Rotrex kit looks appealing, especially since it's easily removed to make the car 'original' again. For Sean in Fresno, that would be an every-two-years requirement to get it inspected and smogged.

Bill Ball, who does a fair amount of work on his own cars as well as those of others, had a supercharger on his car and ultimately took it off.

AO, who knows these cars pretty well, has one but has always been in the tinkereing mode trying to get more and more out of it. There's a spare car there in case he gets bored working on the supercharged GT.

Sean R has a Rotrex kit on his car and loves it.

Point is that most folks who are going down this road are capable and willing to assume the extra duties involved. Kompressors have a funny way to testing the driveline, helping you find the weaker spots. Unless you are adept at engine management, there's always a risk of sudden and often fatal attacks of cylinder overpressure.

I speak from very personal expensive experience with charged intake. I sold that car and bought a SUV for business when some tax laws changed. It only took me a few weeks to figure out that I had an extra half a day minimum in my week, time previously spent "managing" my turbo car's personality. If you have the time and devotion, go for it. But... boost is way addictive. Look how easy it is to just swap a pulley and get another 25 horsepower. An intercooler would be nice, might as well get a huge one in case I 'need' to make another pulley change. Massage the advance a little, that makes some more serious power. Then boom! Needs head work, new pistons and gaskets at minimum. Put in better stuff. Ad mausoleum.

It's way more economical to just buy the AMG kompressor or twice-turbo car, with all the Right Stuff already installed. I know we all love our 928's and all, but mine's a twenty-five year old example of a forty year old design. I love it for what it is, for the way ahead of its time design and the great for the time execution. But, they just don't make 'em like they used to. The new stuff is better. Way better.

John Speake

If you want the best of both worlds then supercharge with a system that can be readily removed and the car returned to stock if you want to sell at some point.

Anything that changes the exterior and interior to non-stock is likely to be a big value loss.

If you never intend to sell then do what you please !

hacker-pschorr

Very well said.

Most of the boosted options do not permanently change the car and can easily go back to stock. With the Murf928 system, there is no retuning of the engine when the blower is removed, the chips don't have to be changed either.
The Murf928 chips will run with the installed 42lbs injectors with or without the supercharger.

It does, but until Victor figures out a way to re-connect the drivers side fuel rail back into the return system and re-install the missing dampener, I will cringe every time I see someone talk about buying his kit.

Greg and Rob have pointed out many times the downside of not properly dampening the fuel system, like Victor is doing with his kits.

If these changes have been incorporated into his kits, that is awesome and I must have missed that post.