I'm just gonna ask, who has supercharged their 911sc??

[FinallyGotOne]

I am kicking this idea around and imagine when the time comes will just have a shop do it for me.

But I am curious who has supercharged their 911 sc and what they think of their decision.

I am told it will boost HP almost 80. which is an increase of almost 50%!!

But I am curious if there is additional work that needs to be done. Are original pistons and rings solid enough to take the extra power. Will it push the cars RPM range up over 7,000?

Mainly will it cause me to end the life of my engine sooner, and is it okay to run the CIS and keep all the rest as it is?

I read a great article, but have still not ever talked with anyone who has actually done it.

It seems it would help with quickness in 2nd gear and up. 1st gear is still just too tall to get any benefit i'd think.

[Dr J]

I did it and absolutely love it!!

So far I have only 2000 miles on so I can't speak on longevity, but I kept hearing of another supercharged 911 that was tracked often and worked well at about 6psi. Just don't get greedy with boost unless you know what you are doing.

The 911SCs were great for their time but are way too slow compared to today's cars. With the supercharger, we're back in business.

AFAIK, stock pistons are fine. I don't feel I need to go high on revs to get good acceleration. It should be good to stock redline. You can keep CIS but need to ensure that you have enough fuel. An AF meter should be used. Search under my name and you should find my build.

BTW, I find I don't have to downshift as much while cruising in the street. It is noticeable on every gear. On first gear, I can get boost, but I have to floor it.

Again, having boost available makes the car very enjoyable.

[kinein]

i am in the process of changing my 3.2 into supercharged aslong as i dont have to decompress the motor

[mikesride]

[QUOTE=Dr J;6079722]I did it and absolutely love it!!

How much do you think you invested in this?

[FinallyGotOne]

this is not nearly enough data for myself, please keep the responses coming!!

I was just told to reinforce the engine to be able to handle the extra power. so what does one suggest? pistons, rings, cam ok? or new Cam needed?

[r_towle]

well, when porsche used forced induction they used stronger head bolts, stronger rods, different sealing system at cylinder to head joint and many more small items were added for strength.

It will shorten the life of the motor..
It will not increase the rpm limitiations on the existing motor...it will just add more forced air into the system...but it wont rev any higher.

It can be done, and I am sure you will have a big grin while it lasts...but at some point you will develop leaks that others do not have on NA cars.

At the end of the day, its an air pump and it was designed for a specific pressure with some room for expansion....but how much boost you put in it will determine how long it lasts without real internal modifications.

RIch

[wjfk32]

Better

Got a 3.3. Turbo engine--Top end rebuild- 1994. CIS TUNED is the only down fall.

Otherwise-The best Sleeper car out there. Hold On!!!!!!!!!!!!!!!!!


Walt

[wjfk32]

[scotricker]

subscribed! I am SO down for this, too!

[stephers]

Hi,
We did a 79 SC up about 15 years ago with a Paxton supercharger. We started with a kit from the fellows that were in Knoxville, not sure if they are still in business. We did a total rebuild on the engine at the same time. We upgraded the headstuds to ARP as well as the rod bolts. We had stock P's and C's, compression was OK. We had the entire engine balanced, not sure now if it was really needed. Kept the stock ign. We did add an intercooler later on as well as NOS at full throttle, used a single fan style nozzle. Had the local cammgrinder, very good one, Shadbolt Cams, regrind the cams to ones with a litle bit more lift and longer duration. Sorry, too long ago to remember specs.

We ran about 8 psi pressure and had approx 280 HP at the wheels and with full nitrous, it ran approx 380-400 HP. Clutch and gearbox were gone through but was all stock.

Ran SSI's into a Monty with two 4" sewer pipe exhaust tips. Intercooler was designed to fit very nicely into the tail.

Car went like a bat out of hell with just the supercharger and was downright scary with the nitrous.

I may have some old pictures around that I can scan and post. Would do it again in a second.

Car would idle around like a well behaved puppy but when you stepped on it.

Rick

[JohnJL]

My track car is supercharged, 340hp and ftlbs at the wheels on .9 bar. She's a hoot. Required significant cost, engineering and time.

[Dr J]

Mikesride and others interested in cost info. I had someone sell me most of what I needed in a kit, which I think is an old SOK kit. Supercharger with bypass valve, pulley, ignition system, fuel distributor, metal airbox, vac/boost gauge and air intake piping for $1800. I designed a crank pulley and had it built by Clewett for $500, a 3.2 engine console $50, serpentine belt $30, misc parts and vacuum lines say $30. I bought a new rotary AC compressor (which I needed anyway) $200. I bought another supercharger pulley for more boost $100.


That could have been total outlay, but I bought a used DWUR for abour $500. Also got a Euro fuel distributor- factor in about $200- could be free if I sell leftover CIS components.

Not cheap, but whipple superchargers are expensive. Anyway, you're not supposed to add these things up!

Future boost upgrades would be a new pulley $100, new belt $30, water/methanol injection $300-$400, an additional fuel pump to increase pressure at the FD? (already have one)

[kinein]

who has the parts list of the sok kit? just want to see what needs to be fab. and sourced out

[Supercharged]

Did my sleeper 85 Targa in 97. Its a SOK kit installed by SOK. Actually it was the first Whipple kit made for the street. Had to do a little work mapping the chip and that took a while but we finally got it right.
I did not want to change anything so everything was left stock on the engine, only thing added besides the kit was a rising rate fuel pressure regulator which was set at 85 psi
The Whipple is limited to only 7psi which the engine seems to like just fine, the dyno read 280 HP and 275 FPT @ the wheels and this is using 92 octane pump gas. She is very fast!!! Did the kit when she had about 90k miles and now have 175k and she still runs like the day I had the kit installed, FAST!!!!
No, leak and no problems as of yet. I just follow the normal tune-up and oil change schedule for car.
Cost about $7000 installed including the trip to Knoxville, getting there was great fun, but the trip back was even funner!!!!!

Don

Here is a pic ( the rag's in the fan are to keep little critters out)

[Supercharged]

Here are a couple more pic's

Don

[kinein]

ive been reading so many threads now......it has me goin back and forth turbo vs. supercharger.....would like to go with a paxton sn2000 setup with intercooler.......i have big huge wing. but then turbo sounds good also.......so for those who have your superchargers do you really like the supercharger? what are your dislikes and likes?

so anyone has a part list yet for the supercharger or turbo setup?