911SC Turbo - Page 2

tsuter · 03-03-2003, 10:58 AM

I'm able to take some of these shots because my 915 is being rebuilt at Kelly Moss and so the motor is out. Transmissions are NOT my area!. FI is.

Hope to get the car and pieces back soon and then I can put the turbo system back together and show some completed shots.

ChrisBennet · ChrisBennet's Garage

Quote:

Originally posted by tsuter
I'm able to take some of these shots because my 915 is being rebuilt at Kelly Moss and so the motor is out. Transmissions are NOT my area!. FI is.

Hope to get the car and pieces back soon and then I can put the turbo system back together and show some completed shots.

Nice bench/cabinet (Lista)!
-Chris

tsuter · 03-03-2003, 11:49 AM

Everyone always said that that rubber center clutch would fail with the turbo. Well it didn't - but I can't believe it was still working.
New Pelican Sachs Power Clutch Kit on the way!!!

And the nicely resurfaced flywheel!

tsuter · 03-03-2003, 03:25 PM

For those with 1980-83 SC w O-sensors, you will want to temporarily disable the O-sensor signal to the OXS Control Unit when you are "on the boost". With the following setup the O-sensor remains in normal operation at all times except when the boost exceeds 1.5lbs when it's signal is then grounded out until the boost drops back below 1.5#.

This next image is of a mechanical boost controller. It will be installed in line with the Wastegate actuator supply pressure hose. I plan to set it initially about 1-2 lbs above the wastegate .
Pieces all over now so completed setup images will have to wait a bit.

dickster · 03-03-2003, 11:55 PM

excellent, enjoying reading this - keep posting!

why cut out the o sensor above 1.5lb? would this apply to 3.2's equipped with the sensor?

tsuter · 03-04-2003, 05:28 AM

The idea is to run "closed loop" as designed when not on the boost and when you are on the boost run "open loop".
With supplemental fuel being introduced at 3.0# boost, the mixture is richened up - to add power and avoid detonation. We don't want the closed loop circuit (frequency valve) trying to take away that fuel, so we run open loop by temporarily disabling the O-sensor signal just before the boost comes on or a 1.5-2.0#.
In regards to a 3.2 if you mean a 3.0 modified with 98MM Mahles then it would be the same.

This setup is for K-Jetronic.

If there is a MAF, Load or Throttle Position sensor(s) in the car and the ECU is already compensating AF mixture for Load and WOT then this may not be necessary.

In this K- Jet 1978SC Turbo I intentionally have kept everything mechanical in tune with the period and have no plans to add electronics or more sophisticated fuel/ignition management solutions.

Other toys are for EFI and current technology. That is just a preference of mine for this car.

tsuter · 01:04 PM

This post shows the oil and supplemental fuel supply set up connections for the turbo application.

Supplying oil to the turbo is critical. I have the oil suppy line connecting off a T-fitting where the oil pressure sending unit is normally attached. The oil pressure sending unit is then screwed back onto the T-fitting. The oil return from the turbo is directly to the lower left chain cover - it is a gravity drain line about four inches long (no picture).

03/04/03 Correction: Oil pressure "warninglight" sending unit. tsuter

The fuel supply line to the CSV installed in the turbo outlet pipe for supplemental fuel enrichment (see earlier picture of CSV with pressure switch) is connected directly into the fuel pressure line on the left with a T-fitting also. See picture. The CSV does not have the banjo type connection so it is a simple line and clamp to connect it. I had an earlier problem with the CSV leaking - but it's an injector - eventually they leak.

RickM · RickM's Garage

Tsuter,
These pics are great. Thanks for posting. Any recommendations on where to get the stainless-braid lines and fittings? (As shown for the oil supply line)
Thanks
Rick

tbitz · 03-04-2003, 12:28 PM

Tsuter,

I think the oil feed line (shown in the pic) is tapped of the oil pressure switch. A light will come on when the oil pressure is very very very low. The sending unit that indicates oil pressure is to the right of the fan just above the right chain cover.

Neat project. I am already collecting parts for my turbo targa project. I of coarse am also doing a CIS-to-EFI conversion, so I have much more flexability with enrichement.

Tony

MotoSook · 03-04-2003, 12:37 PM

Tony your are correct. That is the pressure switch/idiot light, but the same can be done off the pressure transducer fitting, looks like a machined block of brass. Tapping/teeing off of any part of the pressurized oil system will do.

tsuter · 03-04-2003, 12:59 PM

Yep - must have over 100 posts. Its the oil pressure warning switch on the back. The Tee- is a 1/8" Pipe Tee and the connections are teflon taped or pipe sealant. A 1/8P to -4AN staight connects the Tee to the oil line.The oil hose is a -4 Stainless 40" long with one straight end (shown) and a 90 degree end (not shown) connected to the turbo.
It has been there a while so I don't have suppliers but the fittings are pretty standard.

MotoSook · 03-04-2003, 01:01 PM

Suter, you're only allowed one per 100 post

tsuter · 03-04-2003, 01:11 PM

Souk, Did you see my relocated Thermotime Switch picture? On the right chain cover. The Turbo Inlet Pipe blocked access on the left side. Someone once asked why I needed two of them and I told'em it was for the right hand side CSV!

tbitz · 03-04-2003, 01:20 PM

what kind of muffler is that?
Looks like two glass packs welded together?

tsuter · 03-04-2003, 01:39 PM

That muffler is a wreck. I keep hoping it'll rust through so I can get a nice stainless one made. Same thing for the heat exchangers - originals.

MotoSook · 03-04-2003, 01:45 PM

tsuter, I did not notice the TT-switch in any of the pictures, but I like the explanation

tsuter · 03-04-2003, 01:52 PM

Here it is. Had to move the Thermotime switch to the right side chain cover. Lost clean access on the left with the turbo inlet pipe.
No it is not a second one for the right side CSV!

bb · 03-04-2003, 02:45 PM

This is the same kit that is on my 76 2.7 with only minor mod's. It works great. I just got done modifying my exhaust with bb headers, fabricating a crossover pipe and Flowmaster muffler to a double out exhaust. It is fabricated and I am doing the finish welding this week. We'll see how it goes. I did this to see if I could get the boost to come on a little earlier. We'll see how it runs this summer.

tsuter · 03-04-2003, 03:48 PM

Yupper. It was made for 1975 2.7L to 1983 3.0L CIS. Original was lower boost, no wastegate, no supplemental fuel, no boost control but the basic plumbing hasn't changed since I put this on in 1982. If my heat exchangers, headers and muffler will ever rot I'll be doing some fun things there as well as you are!

Hautions11 · 03-04-2003, 07:19 PM

Great info guys. Here is a 3.2 on ebay with an aftermarket turbo on it. The current owner does not even know what brand it is The Item # 2405569883 Can any of you turbo guru's ID the system from the pics?