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911 SC BAE turbo article & Info

As requested by SammyG2 this article is from VW & Porsche magazine's Porsche Performance and Accessories guide; dated March 1981.

BAE Turbo system: 911 (Also 924)




Here is a diagram that Tsuter posted a while ago that may help as well....

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Old 12-03-2003, 09:12 AM
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Thanks very much Rick.
That's the system I'm in the process of installing but mine doesn't come with an A.P.C. valve as detailed in the article, only an exhaust wastegate as indicated in the picture.
Old 12-03-2003, 09:17 AM
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Please take pics and post. :-)
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Old 12-03-2003, 09:29 AM
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Very nice. Thanks for posting it. I wish the article talked a bit more about the 911 system.
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Old 12-03-2003, 09:39 AM
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I may have another BAE article...I'll have to look.
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Old 12-03-2003, 09:45 AM
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Looks like a neat kit. I'm not clear on that APC thing. If it is venting intake air, hasn't that air already been used to meter fuel, causing super-rich running on max. boost?
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Old 12-03-2003, 09:52 AM
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So far all I've done is mount the hardware to determine fits and any interferences.
I still have to run the oil lines and rig up a better muffler support strap, right now it has the entire muffler hanging on the turbo housing and that it a no no.
I'm going to start off with low boost numbers, prolly around 5 psi and then eventually move up from there with a supplimental fuel injector and intercooler.

I agree on the APC valve making it run rich, seems like a better idea would be to set the waste gate to control boost and use an APC (blow off valve) to only relieve when the throttle body is closed during boost conditions i.e. set the waste gate at 5 psi and the blow off valve at 7 psi or something like that.



Here's a picture of another turbo install I did about 4 years ago, only that one was on a 2 liter 914.
Old 12-03-2003, 10:07 AM
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Any idea how much the turbo weighs?
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Old 12-03-2003, 10:52 AM
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And any plans to upgrade/update the turbo?
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Old 12-03-2003, 11:00 AM
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The turbo itself prolly weighs around 30 pounds.
I may eventually upgrade the turbo but I need see how it performs as is. It may work just fine. I don't need high boost levels so if anything I would be looking ofr a turbo that has high efficiency ratings at a given flow/pressure, reasonable surge levels, and one that develops boost as low in the rpm range as possible without giving up any top end.
That is like having my cake and eating it too, everything is a compromise.

I plan to locate a compressor map for it and compare it to whatever is out there. I play with centrifugal compressor curves at work from time to time so it's not that far of a stretch to compare characteristics of different turbos.
If there is a drammatically better option I may cough up the $$$ for it, but if it is only slightly better there's no sense in it.
Old 12-03-2003, 11:14 AM
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How does the BAE turbo compare to RFNG's?
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Old 12-03-2003, 11:49 AM
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Haven't seen or tested his, heck I haven't even got this thing running yet, so it'll be a while before I can make any comparisons.

I plan to be very conservative with the boost and am only looking for a noticeable performance improvement, not a huge horsepower monster (yeah right)
Old 12-03-2003, 12:08 PM
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Where'd you find the turbo, anyway? Ebay? Off the Pelican Classifieds?
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Old 12-03-2003, 12:22 PM
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That looks familiar, a lot like rfng's kit
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Old 12-03-2003, 12:23 PM
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I found it in the recycler, www.recycler.com
Old 12-03-2003, 12:24 PM
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Here's what's included in RFNGs kit:

Quote RFNG

"Here's the deal- The kit includes the following:

1. T-3/T-4 hybrid turbocharger
2. Wastegate acutuator
3. Oil supply line to Turbo
4. Oil drain line from Turbo
5. Cross-over pipe from stock heat-exchangers
6. Modification to your distributor
7. Modified sump plate
8. Sensor plate boot
9. Throttle body boot
10. Inlet pipework from Sensor boot to turbo intake
11. Outlet pipework (pressure side) from turbo to throttle body
12. Modified airbypass (choke for mornings)
13. Modified regulator-fuel enrichment device with appropriate shims
14. Silicon hoses (2)
15. All necessary clamps; nuts and bolts for installation
16. complete exhaust system-exits the passenger side-must cut sheet metal on the rear valance yourself
17. template for rear sheet metal & blank plate
18. All necessary brackets to mounting turbocharger to engine mount
19. All necessary gaskets
20. Modified front cover-driver's side exchange
21. Spark plugs?
22. Reducer and expander for inlet and out of turbo to pipework

I'm sure I've left out small misc items, I would sugguest that if you have not backdated your heating system, do it now. The kit will not fit with the stock SC heating plates. I would also suggest that if you don't have an aux oil cooler, you will need to install one.

Price $3,450.00 plus shipping and appropriate sales tax for ca residents....."

This and other SC turbo info here on the longest SC thread known to man. Mention of others with BAE systems (Tsuter). I believe a mention of Fuel Enrichment issues are brought up. However, that may be related to the coaxing of additional HP from the system. http://forums.pelicanparts.com/showthread.php?threadid=9788&perpage=20&highlight=bae%20diagram&pagenumber=12
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Old 12-03-2003, 12:31 PM
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Quote: "I found it in the recycler, www.recycler.com"

Wow, I just went there and found a Protomotive stage 2, 3.2 turbo system for $150!
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Old 12-03-2003, 12:33 PM
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The APC should be removed or blocked for the reasons mentioned. A wastegate is more effective especially with a manual boost controller - mine is Tialco 35mm with the BC from slowboyracing.com.
If desired for overboost on throttle closing one solution would be to plumb a vacuum operated (connected to the lower TB) Bailey Diverter Valve beween those two large pipes (Turbo Outlet to Turbo Inlet). In this way metered air would be recirculated. Course that may blow back your sensor plate a bit.
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Old 12-03-2003, 04:55 PM
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Sammyg2
This is what I have found on the rajay turbo... not much... but its a start. I have the same BAE system that I am putting together. I still haven't found any maps yet for it. If its the .60 i believe the the boost will kick in at about 3500 rpm. I have purchased a k26 and a wastegate for the audi 5cyl engine, I too am looking for faster spool up for my 2.7.


http://victorylibrary.com/wwwboard/index2.html

Posted by Rick on July 09, 2003 at 20:53:16:

In Reply to: Rajay --- Need help in finding specs on Rajay turbo posted by Jeff S on April 30, 2003 at 18:39:30:

Rajay came with 3 wheel sizes for the compressor and turbine. They were E, F, & B with the E being the largest and the B the smallest. They produced many variations on those wheels, for example, you could get a B-B turbo with a "B" trim compressor and "B" trim turbine. Or, a F-B that would have a "F" trim compressor and "B" trim turbine, and so on. You would not ever see a situation where the exhaust wheel would be larger than the compressor. With all of this in mind, the largest setup would be a E-E turbo... the smallest a B-B.
There were two styles of center sections on the Rajay. One style had a single oil inlet and single oil outlet. The second style had 3 large oil drains located radially on the center section. In regard to exhaust housings, there were three small size housings offered for the "B" and possibly the "F" trims, they were .40 A/R, .25A/R and I have seen .20 A/R. All larger housings were 4 bolt pattern and ranged up to 1.40 and above. You turbo is a B-B trim with a .40A/R exhaust housing. You can find the A/R number just inside the exhaust housing by the exhaust inlet mounting flange. One thought, if the tag on the compressor housing says it is a 301B40, that is assuming no one has changed the exhaust housing. The upgrade to this setup is to move to a "F" trim compressor wheel. I have run the F-B .40 setup on a 1915cc engine and it easily makes 15 psi instantly...

Tim in Sac
Old 12-03-2003, 07:39 PM
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I have the same kit on my 2.7 it works pretty well. There is a guy named Geary at Turbocity that helped me out with the Rajay turbo questions.
Old 12-04-2003, 08:22 AM
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