Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 / 930 Turbo & Super Charging Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: Mar 2011
Posts: 471
911SC Turbo Conversion?

Hi all,

Got a fellow Porsche friend with a nice tight 911SC who wants to turbo his motor with a low boost setup.

Any of you guys done this before?

The 3.0 motor runs 8.5:1 C/R, so I guess it should be fine with approx 10psi boost using a bolt on setup?

Got a few questions:

1. Would 930 style headers bolt onto the SC motor?
2. What fuel enrichment options are there for such a setup? I've heard no extra fuel mods for low boost?
3. What about ignition timing for this setup? I've heard stock ignition timing for low boost?
4. What should one do to strengthen the motor? Aftermarket fasteners/studs?

Thanks!

Last edited by 911TT33; 11-13-2011 at 01:19 AM..
Old 11-13-2011, 12:32 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Jan 2004
Location: Milwaukee, WI
Posts: 3,203
Lots of info on this posted here. I just finished the conversion myself.
Yes 930 headers will work.
My car runs fine with the SC pump, but you need to check your fuel pressures first.
Depending on your setup, you really should dyne tune to set the best timing. The death of turboing a car is detonation so you need to monitor the AFRs when tuning, as you want to make sure you don't go lean under boost.
Typically headstuds are an issue, you want to make sure they are intact, but would recommend replacing those.

With out a large intercooler, meth inj, etc. 10 psi might be too much. 0.4-0.5 bar is much safer with the stock c/r.
__________________
Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 11-13-2011, 06:26 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Jan 2004
Location: Milwaukee, WI
Posts: 3,203
Although my car is running well with the SC distrbutor, I am looking at other ignition options so I can retard on boost.
Good luck!
__________________
Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 11-13-2011, 06:28 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Brando
 
quattrorunner's Avatar
 
Join Date: May 2006
Location: Las vegas
Posts: 5,880
Garage
Do a search. It's been done successfully. Make sure the engine is healthy and have fun.
Old 11-13-2011, 08:05 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
sjf911's Avatar
 
Join Date: Dec 2006
Location: Idaho
Posts: 5,624
Garage
Quote:
Originally Posted by 911TT33 View Post
Hi all,

Got a fellow Porsche friend with a nice tight 911SC who wants to turbo his motor with a low boost setup.

Any of you guys done this before?

The 3.0 motor runs 8.5:1 C/R, so I guess it should be fine with approx 10psi boost using a bolt on setup?

Got a few questions:

1. Would 930 style headers bolt onto the SC motor?
2. What fuel enrichment options are there for such a setup? I've heard no extra fuel mods for low boost?
3. What about ignition timing for this setup? I've heard stock ignition timing for low boost?
4. What should one do to strengthen the motor? Aftermarket fasteners/studs?

Thanks!
930 headers fit fine. I don't see how you could possibly run 10lbs of boost without serious fueling mods. The stock fuel pump easily handles the HP at EFI pressures (I have about 300-310 at the wheels with a nominal 2.5 bar fuel pressure and stock CIS pump) but I don't know about CIS especially at 10lbs which is almost 930 territory which runs 2 fuel pumps.
Timing is one key to minimizing destructive issues but impacts performance. I am actually seeing some sub-audible detonation with my car at only 0.6 bar with meth and an intercooler trying to run a little more aggressive advance (17-18 degrees with twin-plug).
I think the biggest weaknesses associated with this change are inadequate stock oil cooling, inadequate oil scavenging provisions, risk of piston failure from detonation, inadequate control of timing, transmission failure from excessive torque, clutch failure, inadequate brake capacity, and suspension. Then, of course, there is the problem of having more horse power than you need but it never being enough.
__________________
Steve
Sapere aude
1983 3.4L 911SC turbo. Sold

Last edited by sjf911; 11-13-2011 at 08:54 AM..
Old 11-13-2011, 08:51 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Registered User
 
Join Date: Mar 2011
Posts: 471
Thanks guys.

So 0.5 bar / 7psi can be run safely with no fuel/ ignition mods, or intercooling?

What kind of power can one expect from such a bolt on setup?

I know the 3.2 bolt on turbo kits net great power output. Just wondering how the SC compares?

Jeremy, have you looked into the MSD ignition unit with ignition retard? It can retard ignition from 0-3 degrees per psi of boost. Might be a good solution?
Old 11-13-2011, 12:49 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
Brando
 
quattrorunner's Avatar
 
Join Date: May 2006
Location: Las vegas
Posts: 5,880
Garage
The ones I remember made like 230-260hp. Depending on a few differences
Old 11-13-2011, 01:16 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Porsche 944S Club Sport
 
guru944's Avatar
 
Join Date: Jul 2009
Location: NYC-Long Island, NY-USA
Posts: 951
Garage
Send a message via AIM to guru944
911TT33;

Good project...
Also recommend MSD6BTM, very reliable.
Low boost pressure 0.5bar (7psi) is safe. Intercooling a must and no methenol.
Engine Oil cooler also a must (bigger is Better) and Quality Synthetic Oil like AMSOIL a must.
PM me if you need anything..
and Keep us posted
Later...
__________________
Guru944
2006 955 Cayenne S Titanium Series - Marine Blue, 1987 Porsche 944S Club Sport.
1987 Buick Turbo-T Lightweight "Great White", +500HP, TA49 Turbo.
http://www.blackbirdmotorsports.com, 944/951/968 & 911 Performance Solutions.
Thank you Lord, for your Loving Kindness, Tender Mercy, and Grace. Only You are Faithful.
Old 11-13-2011, 01:18 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Registered User
 
Join Date: Jan 2004
Location: Milwaukee, WI
Posts: 3,203
I have not yet, my heads are twin plug, but haven't decided how I am going to fire them yet. A bolt on kit will easily add min 50 hp
__________________
Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 11-13-2011, 01:44 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
Registered User
 
DSPTurtle's Avatar
 
Join Date: Jul 2001
Location: Suntree, Florida, USA
Posts: 2,235
Have you considered an SC instead of a turbo? SC makes much more linear power. I think my next project might be to SC a P-Car.
__________________
JB - BreitWerks
www.breitwerks.com
321-806-8664
Engine Rebuild & Restorations
Old 11-13-2011, 03:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Registered User
 
Join Date: Mar 2011
Posts: 471
Don't like superchargers... they rob power to make power. Too much parasitic losses.

My friend wants to go the turbo route because he'll end up rebuilding the motor down the track for more boost and fit EFI etc...

Last edited by 911TT33; 11-13-2011 at 04:11 PM..
Old 11-13-2011, 04:03 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)
Registered User
 
DSPTurtle's Avatar
 
Join Date: Jul 2001
Location: Suntree, Florida, USA
Posts: 2,235
I respect your friends desire to go with a turbo. But, I must admit, I was in the same boat a few years ago. I thought that SCs were wasteful. That is until I put one (twin screw) on a bone stock Mustang and went from 303hp to 479hp (at the wheels) with no other mods. I have both turbocharged and supercharged cars. The turbo is more "exciting." The SC is more powerful but "boring." It has intrigued me enough to want to try it on a P-Car. 9psi should be a good option.
__________________
JB - BreitWerks
www.breitwerks.com
321-806-8664
Engine Rebuild & Restorations
Old 11-13-2011, 05:53 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #12 (permalink)
Registered User
 
jsveb's Avatar
 
Join Date: May 2007
Location: Norseman territory
Posts: 2,783
Garage
try and do a search for the user "tsuter" - I think that was his user name.
That is one of the oldest and comprehensive threads on this.

Good luck
__________________
Jesper
Carrera 3.0 1975
930 1978 OEM Matte Schwartz, ANDIAL IC, BL WUR, SC cams. LMA-3 w. XD-16 and CP transducer
www.stauningwhisky.dk
Old 11-14-2011, 06:52 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #13 (permalink)
Registered User
 
Join Date: Mar 2011
Posts: 471
Thanks, will do. Maybe if we keep the boost to 0.5bar, all should be good.
Old 11-15-2011, 04:23 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #14 (permalink)
Registered User
 
Join Date: Jan 2004
Location: Milwaukee, WI
Posts: 3,203
Here is a good start, and a great price!!
Porsche 911 930 Turbo Headers Exhaust Manifolds | eBay

Think you will need to swap out the exhaust studs though for longer ones as these look like thick flange.
__________________
Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport

Last edited by jcc911; 11-15-2011 at 04:38 PM..
Old 11-15-2011, 04:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #15 (permalink)
Registered User
 
Join Date: Jan 2004
Location: Milwaukee, WI
Posts: 3,203
I am running 0.5 bar with out issue, and might take it up a point or two with twin plug and more fuel but will see what that does to my AFRs.

I posted my conversion here as well, there is some good info.
__________________
Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 11-15-2011, 04:37 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #16 (permalink)
Registered User
 
5.7 GT1's Avatar
 
Join Date: Nov 2008
Location: San Diego
Posts: 480
turbo conversion

You maybe interested in these parts I have for sale most of what you need is there. I have just about all you need less the 930 lower intake. Let me know if you are interested. Here is the link: FS 930 parts
Old 11-15-2011, 05:26 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #17 (permalink)
Registered User
 
iamchappy's Avatar
 
Join Date: Feb 2003
Location: Minnetonka, MN
Posts: 1,447
Garage
Slippery Slope, this SC engine started out as a 79 3.0 now it's a 3.1

I drove my turbocharged 3.0 engine for a few years with a refitted BAE kit, MSD BTM retard ignition and a 7th injector for enrichment. I ran 9lbs of boost on the street.

All you will ever need to know on this thread.
I can send you a PDF of the BAE manual.

911SC Turbo





__________________

914 6 Turbo twinplug 3.12
87 924S
Lexus SC400
Lexus LS400
Old 11-15-2011, 05:32 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #18 (permalink)
 
Registered User
 
jsveb's Avatar
 
Join Date: May 2007
Location: Norseman territory
Posts: 2,783
Garage
Iamchappy, I have followed your build since I joined PP.

Man it is sweet!!!

I have got a 930 cis, less wur. I'll sell it cheap. The injectors are cleaned and tested.
__________________
Jesper
Carrera 3.0 1975
930 1978 OEM Matte Schwartz, ANDIAL IC, BL WUR, SC cams. LMA-3 w. XD-16 and CP transducer
www.stauningwhisky.dk
Old 11-15-2011, 05:40 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #19 (permalink)
Registered User
 
iamchappy's Avatar
 
Join Date: Feb 2003
Location: Minnetonka, MN
Posts: 1,447
Garage
I remember you Jesper, how are things with you...
__________________

914 6 Turbo twinplug 3.12
87 924S
Lexus SC400
Lexus LS400
Old 11-15-2011, 05:44 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #20 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 10:16 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.