911SC Turbo

[sjf911]

Originally Posted by laughac

Thanks all.
Found out that I blew piston #2. Broke the ring landing.

Time for a rebuild with forged pistons and steel cylinder walls.
Picking up a spare engine this week to use for a while during the rebuilt process.

Sorry to hear that. Any ideas why?

[mb911]

Steel liners would be a unique choice but been there done that I used JE pistons and QSC cylinders

[2porscheguy]

I just happened to stumble upon this thread....great stuff! I have owned a 1980 911SC Targa with a Rajay turbo for close to 20 years now and have been searching for info on the set-up for quite some time. I know it's "been years" but could I ask you IAMCHAPPY to please send me the BAE manual via email.....it would be much appreciated!

[EPorsche]

subscribed

[iamchappy]

PM me your email, so i can send it off..

Chap

[Homegrown]

This tread is facinating

I read the hole tread onece a year and I think it´s really fun each time.
Alot of nonos about oldschool turbo charging, but in the long run if everything is made properly you will have really fun porsche for minor cash and good longwity

[nilknarf]

This thread is the main reason I'm keeping my CIS setup even after my carb conversion- it's good to keep one's options open!

[Url]

Can someone mail me the BAE manual as well? (have bought one recently)
Please PM and I'll send my email address

[Url]

I've bought a BAE kit last week and I've got some questions before I get going! The goal is to install it on a 1978 SC.

- Did you guys take any precautions before the install? Compression test/leakdown test? I want to make sure I don't have any issues which will become more apparent once the turbo generates additional stress to the engine ...
- The kit comes with a 2-in (old style heat exchanger) intake whereas my SC has the original HE's with a cat bypass pipe. What would you do? Switch to old HE's/SSI's or create an intake on the cat bypass pipe?
- What have you used as oil feed? T-connection on the oil pressure sender? (Right of the fan)
- As suggested in the BAE manual, I'm planning to have the oil return in the bottom of the left chain cover. However, on the template there is a drill and tap foreseen on the top of the left chain cover as well? (For a sensor?) Which one is that? Relocation of the Thermo time switch on the left of the cover to clear the pipes?
- Is the original BAE wastegate solution useable or should I switch immediately to a more modern solution? If yes, what do you suggest?

I'll have plenty of questions along the way, I'm hoping you guys are willing to help me out as this is the 1st time I'm taking on a project like this!

[jeffbottman]

I asked Todd Knighton (Protomotive) about turbochargers for 3.2 Carreras a few months back. He said they still have fixturing for their kits and could knock one together. I can forward an email that details performance, cost, and components in the kit. Bottom line, can get up to 360 HP with their low end non-intercooled kit at .5 bar for $9k installed ... BUT price list is from 1999 ...

PM me if you want complete email reply to my inquiry.

--Jeff

[zl0ca]

bump to the top...can people maybe post some video's, dyno sheets and failures they have had with these kits

[jcc911]

SC Turbo Conversion, The Result (Dyno!)

[WonkoTheSane]

Anyone from this old thread happen to still have a copy of that BAE install manual they could email me? Perhaps even a J-pipe or set of OBX headers willing to be parted with to start my journey down this boosted life path?

For a different question, is a '83 with its 9.3 CR capable of even doing this? Seems most always use a earlier SC with the lower compression.

[85258]

I have the manual still. Never installed the kit and sold both the car and kit. PM me your email.

[spuggy]

Originally Posted by WonkoTheSane

Anyone from this old thread happen to still have a copy of that BAE install manual they could email me? Perhaps even a J-pipe or set of OBX headers willing to be parted with to start my journey down this boosted life path?

For a different question, is a '83 with its 9.3 CR capable of even doing this? Seems most always use a earlier SC with the lower compression.

Welcome to the Dark Side Wonko....

You might want to checkout 911 / 930 Turbo & Super Charging Forum - Pelican Parts Forums - lot of useful information there on tuning 930s, or adding forced induction to SCs & 3.2s.

(This thread started by tsuter predates the creation of that forum...)

You can add boost to anything, with or without an intercooler. How much boost, precisely, depends on where it detonates. Knock detection will protect your motor and/or allow you to run it closer to the edge - and keep running the maximum advance for best response. Also water/methanol injection will prevent/control detonation.

Biggest issue with an SC will likely be getting the fuel out of an N/A CIS setup you want/need, not to mention matching CIS fueling to the new characteristics/demands. Going EFI for accurate fuel/spark control would probably avoid a lot of pain. An intercooler keeps the charge air cooler - thus denser - and will make more power with less risk to the motor.

Adding 40-50HP in a low-boost setup to an SC should be quite do-able on the cheap, and with a suitably-sized turbo (eg small, for quick spool), you'll certainly notice the difference. It won't help longevity on a tired motor, clutch or transmission much if you use it, though...

The problems start if you like it and want more. Then you have to re-visit/throw a lot of it away and start over - not to mention upgrade a whole lot of other systems like brakes, suspension, transmission, clutch etc.

[tsuter]

So since starting this SC Turbocharging Thread 20 years ago, I thought I should do a small update on where we are at now.

I had not dropped my engine since 2002 to rebuild the 915 and do several updates to the turbo system covered in the thread.

Now 2022/23 I did another drop for purposes of fixing oil leaks, RSR seals, rear main seal, and so on so this gave me a chance to do some turbo system enhancements that I had not done 20 years ago. Plus the car just went over 80,000 miles.

The main enhancement was to remove the 7th injector (CSV) entirely from the intake plumbing (see turbo kit sketch follows)
This injector was integral to supplemental fuel enrichment activated at 3.PSI by a Hobbs pressure switch aka Callaway Microfueler see Bruce Anderson's Performance Handbook at p141-143.


I also updated the airbox with the (newer than 1978) integral fuel distribution manifold aka the spider. This manifold serves to better distribute fuel provided by the cold start valve (CSV) into the six intake runners and mitigate backfires.



With this in place, I then designed a simple two relay circuit pack that I mounted on the #3 intake runner and spliced into the CSV electrical harness to provide both triggered power and a ground to the CSV.



Now I am able to activate the existing CSV valve directly (at 3.0PSI) for fuel enrichment and eliminate the "seventh" injector. This enhancement removes extra fuel lines as well as putting the fuel right where needed. Into the heart of the "spider"! And all done electromechanically consistent with the engineering of the period.

Here is a pic of the new relays sitting on the #3 runner. The wiring harness to the CSV is spliced in and you can also see the Hobbs pressure switch used to trigger the relays and thus the CSV by proving both ground and power.



This is "old school" single stage enrichment at a set boost level in this case 3.0psi. All else is stock CIS.



Pump it up boys!

[WonkoTheSane]

Awesome to see the factory CSV used for enrichment. On one hand I want to go EFI and electronic ignition, on the other, I'm fascinated by using the original old CIS technology. Have read over all 28 pages of this thread several times and just love the info here.

Still struggling to find a J-pipe that isn't absurdly priced. I'm sure I will eventually with some patience.

[dah72094]

You will love it Wonko. There is nothing like it when the boost kicks you back in the seat. I have been running a BAE turbo kit on my '75 U.S. Carrera for the last 10 years, and it has evolved from there into a 934 inspired setup. You can get plenty of fuel from the stock fuel head at low boost levels, but without boost enrichment it will be fat off-boost. I recommend running a 123Ignition distributor. You can set the factory ignition curve with vacuum advance, and add an additional boost retard. The car will love it, and it is all programmable from your cell phone. You can use the factory CDI as well. Careful though, boost gets addictive!

[WonkoTheSane]

Originally Posted by dah72094

You will love it Wonko. There is nothing like it when the boost kicks you back in the seat. I have been running a BAE turbo kit on my '75 U.S. Carrera for the last 10 years, and it has evolved from there into a 934 inspired setup. You can get plenty of fuel from the stock fuel head at low boost levels, but without boost enrichment it will be fat off-boost. I recommend running a 123Ignition distributor. You can set the factory ignition curve with vacuum advance, and add an additional boost retard. The car will love it, and it is all programmable from your cell phone. You can use the factory CDI as well. Careful though, boost gets addictive!

Wow, wicked cool set up you have there. Love the 934 header with center mounted.

I am pretty sure I won't be able to find any old BAE boots to use, so have been thinking of some type aluminum replacement that I'll just machine out myself.

[tsuter]

So to provide some context to this thread, I thought I would post the article that got it all started.
One of my buddies on Oahu had a 79 930 and of course by 1981 Porsche 930s were on US hiatus due to not meeting more stringent US emission standards. But I wanted more power for my 78 SC like my buddies 930!

This was 1981 on Oahu. Waipahu Sugar mill was still in operation, Dillingham airfield was a fun speed run out Ka'ena Point way and the Silver Dolphin (aka The Red Door) still served some fine Olys and girls off Pearl Harbor!

Then VW&Porsche Performance and Accessory Guide came out with their 1981 Holiday edition and low and behold about eight pages devoted to turbo kits!




I immediately went down to see Steve Collins at Automotive Engineering on Cooke Street in Honolulu. He had worked in Torrance and knew Bob McClure who was now selling 100 turbo kits a month at BAE for VWs, 924s, and now 911s from the 2.7s forward.
Unfortunately I had a deployment come up in early 1982 but my BAE kit was installed by Steve in September 1982 with the $200 wastegate option for $2288: parts and labor...and about 80-90 more HP with Steve's trick Callaway type microfueler.



Those fun runs out at Dillingham and over past Wimea became a lot more spirited. And 41 years later...not much has changed. Porsche reintroduced the 930 to the US market in 1986 and BAE's run of turbo kits for the hiatus years came to a close. But some still linger on......