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Join Date: Apr 2004
Location: Bradenton, FL
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All Porsches should be track capable. Lot easier to build a street only model, that never sees more tha 10 seconds of boost. Prior, I had no boost retard. That strategy did not work out as well as hoped. The new iteration has an MSD boost retartd box, and a J&S Safeguard. I figure the MSD will for sure work, whereas the J&S unit will let me run at the edge of detonation.. I don't know how good of a knock signal I will get.
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Patrick E. Keefe 78 SC |
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Found an old article on turbo charging Bosch K-Jetronic 911's, very simple design.
Note this was done on a 1974 model car so should be better all round on a 3.0 car ;-) Im torn between turbo charging and supercharging myself, supercharger seems easier but when ever i hear a Zork im left nursing a semi lol. This type of setup with maybe a few added extras from other peoples turbo conversions maybe the answer... ![]() ![]() Two more images to follow |
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Anyone know if a turbocharger form an Audi TT would be good for a 3.0 conversion?
There are several different models and are KKK like Porsche used to use model numbers : K04 - 020 K04 - 022 K04 - 023 Prices seem good second hand, easy availability and they have an adjustable actuator with them to adjust boost. |
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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Good find on the article.
This is a "Blow Through" style set up and exactly what I was thinking! Last edited by 911st; 03-22-2010 at 08:21 PM.. |
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Just found these on ebay, not sure what the turbo's are like, but they are selling them stating they are fine for 911's and engine from 1.8 to 3.0 ltr, the turbo's alone are cheap and the extra parts in the basic kit would come in handy, although a large intercooler with different shape and in/out locations would be better :
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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I have to assunm thouse are Chinise turbos. I do not know anything about them but what little I have heard would give me pause.
I would rather find a used K27-7200 or even stock LDZ from a stock 930. Alternately. I bought a custom 60-1 Turbonetics turbo once several years ago new sized to work well on a 930 for about $650. I do not know what they would cost now but they are very good turbos. Might look into something like that. 944 and Audi units will be to small on the hot side. |
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I don't think that clear plastic air-box cover would stand too many engine heat and 5 psi boost cycles before fatigue failure and blowout.
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Steve Sapere aude 1983 3.4L 911SC turbo. Sold |
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
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This is out there and not tottaly in the spirt of a cheap build.
I wonder if one could by going with the blow through design fit a water to air intercooler into the air box. Could just leave the back side of the air section open and flange it to fit part way into the CIS air box. This could get effective intercooling under the stock hood. Would be pretty neat. Could be fun. |
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Join Date: Jan 2004
Location: Sacramento
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I wonder if one could fit a pot from a 930 to the SC distributor to get "boost retard" in place of vac retard.
I suspect one would have to use the inside or Vac Retard side of the 930 pot to do this. Then just set timing like on a 930 at 25 deg at rpm and when boost come up it would retard to about 19 deg. I wonder if there is a correlation between the direction a Porsche dist rotates and if it has vac-advance (2.7RS and 3.0 Turbo?), or vac retard (SC and 3.3 Turbo?). |
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This thread has me interested.
I have a 1980 Euro 3.0l SC with 8.5-1 pistons. I'm also using TBitz's EFI setup. (If it helps or matters) Using a modest, stock 930 turbo system is an interesting idea. Has someone made a parts list by any chance of what it would take to do a "stock 930" turbo conversion? I saw Ben (M&K) has a turbo kit, but doesn't have any info on his website yet. -Just curious, but might pull the trigger.
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-Kyle * 1980 911SC - Widebody, turbo conversion, 930 LSD gearbox, Bitz MS-II EFI, Carerra intake, <2400lbs, 360whp @9psi. |
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Join Date: Jan 2004
Location: Milwaukee, WI
Posts: 3,288
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Here is a list of all the items I sourced for the conversion. Some parts are not required, like the twin plug and 965stuff.
Good Luck!!! 930 CIS CIS Fuel Lines - only bc my cis was missing this CIS Elbow - only bc my cis was missing this Turbo Piping Intercooler&Shroud Airbox 993 Hes Flip Flanges Y-pipe Turbo Scavange Pump Muffler Intake Studs Turbo Bracket IC Bracket (+coil) Turbo Oil Tank Waste Gates 38mm Vband Charge pipe seal WUR Banjo bolt "Turbo Oil supply Lines/ IC Harware, Mount" Turbo oil return - AN fittings K27 Adapter Airbox to CIS bracket 965 Elbow 965 Reducer "Gaskets (P. Parts Order) Brake pads, o-rings" Turbo Decklid Boost Guage Distributor Lower Plug Wires
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Jeremy C. Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham) ----Nothing is far away in this car!--- -2002 996 C4S -2008 550i M-Sport Last edited by jcc911; 08-11-2010 at 03:12 PM.. |
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Thanks for the shopping list Jeremy!
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-Kyle * 1980 911SC - Widebody, turbo conversion, 930 LSD gearbox, Bitz MS-II EFI, Carerra intake, <2400lbs, 360whp @9psi. |
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yep, im slow in the head
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neat project
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1978 911sc Targa - CNC plasma/router cut parts, tig welding, sheet metal work, VAG-COM, LM-1. let me know if u need something |
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A proper conversion will cost a LOT of $$$$...I spent roughly $22,000 converting a 1983 SC to a 3.3L turbo(1986 930 engine)IF you SC is in good shape, it may be worth it just to sell it outright, and buy a properly sorted 930.
The tranny is also something to consider...my 915 was beefed up, with a Proforce Clutch/Flywheel wet-up. The conversion was done by 911 Design(which also run a 911 in the ALMS series) in Montclair, CA. Personally, i don't recommending trying to make a 911SC engine into a 930 engine. The 930 engine was designed from the get-go for forced induction...not so for the SC series. What you may have at the end of such a project is a 'bastard-child' which may be difficult at best to sell or establish a value(kinda like doing some home improvements which can actually de-value a home) Contrary to popular belief, parts numbers on 911 engines that start with 930_... are not 930 turbo parts lifted onto the regular 911. Good luck whatever you do!
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1983 911 3.3L Turbo(YES, I know the turbo badge is on the right...had to be different!) 1996 Toyota Corolla(der 'clapper') |
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Happiest when Tinkering
Join Date: Jun 2007
Location: Missouri
Posts: 4,184
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Quote:
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" Porsche there is no substitute" I always liked that saying. Air cooled is the only way to go! 76 911 C.R.A.P. Gruppe #2 BIG time TURBO C.R.A.P. Bitz EFI/EDIS Now MegaSquirt 3 76 Blazer also restored by me |
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Quote:
Don't take offense at the 'bastard-child' comment: I am sure that someone down the road would want to buy it, but personally I won't touch someones "project" car with a 100 foot pole. Why? Any 911 is seriously de-valued when the engine is re-worked into something it never was intended to be. The crank, heads, pistons, bore, just to name a few are major differences between the normal 3.0L SC engine, and the 3.3L turbo. Those and many other changes are the 'subtle' differences that make the engine upgraded to take the forced induction(which that 930 was designed and engineered for), along with the RELIABILITY. I am sure you could twin-turbo a 911SC engine, but it might only last 10-20K. You could chase down parts for 6-12 months, and beat youself up in the heat/cold of your garage, only to result in something less than desirable. Even as an engineer, I trust the engineers at Porsche a LOT more than me that they did the research and development on that turbo motor. Trying to spin yarn into gold in my own garage...I just can't go there. My 7 years in university was my "mount everest". I'm not going to try and re-invent the wheel, when it's sitting right in front of me. Cheers! ![]()
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1983 911 3.3L Turbo(YES, I know the turbo badge is on the right...had to be different!) 1996 Toyota Corolla(der 'clapper') |
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Happiest when Tinkering
Join Date: Jun 2007
Location: Missouri
Posts: 4,184
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Quote:
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" Porsche there is no substitute" I always liked that saying. Air cooled is the only way to go! 76 911 C.R.A.P. Gruppe #2 BIG time TURBO C.R.A.P. Bitz EFI/EDIS Now MegaSquirt 3 76 Blazer also restored by me Last edited by gsmith660; 09-03-2010 at 09:48 AM.. |
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