Project Twin Turbo - Making Progress - Page 2

pbs911 · pbs911's Garage

Very, very nice. Did you ever get the sequential shifter worked out?

Natchamp · 08-14-2003, 09:03 PM

Never did finish it. I always had so many issues to work on with the SC setup I never had time. Then I decided to go twin turbo and I still don't have any time. When I get it back on the road I won't have any more money! I'm ready for a break too, I've been working on this project for over 4 years I think. I might still do it some day. I still beleive in the idea and think it would work pretty cool.

caliber60 · 08-15-2003, 10:22 AM

Unbelievable process. Thank you for the website. I walked through the whole process in less than a minute.

RarlyL8 · RarlyL8's Garage

Looks great Mark!

I've been away for a while and didn't even know you had actually started this project. I really like the air filters. A great detail usually forgotten in turbo cars is access to ambient temperature air.
Didn't see the wastegates. Did I miss them?

Natchamp · 08-15-2003, 08:46 PM

Hey Rarly dude, glad to see you around. I pretty much ghost mostly. They are K16's which have internal wastegates. I'm going to send them to Kevin at Alimo for some special treatment. How's your car running?

ronin · 08-15-2003, 09:58 PM

checked the site. two words: absolutely amazing

B.Lane · 08-15-2003, 10:08 PM

Simply said...BAD!! F#$%ing BAD! Killer man....im totaly impressed.

350HP930 · 08-15-2003, 10:45 PM

I realize this is likely to be a fair weather flyer but what are you going to do about the air intakes when you get caught in the rain?

ronin · 08-15-2003, 10:47 PM

drain holes at the bottom

Natchamp · 08-15-2003, 11:00 PM

Thanks everyone.

Yes, a fair weather Beast it is but just in case.... I was planning on making some trick covers that just clip onto the top of the air filters in case of rain. They would still be able to breath from the side. Dunno for sure, as Ronin indicated drain holes if nothing else.

RarlyL8 · RarlyL8's Garage

The car is running great Mark. I drove it 500 miles from IL to AL a few months ago with not a hitch, glitch, or hickup. I couldn't be more pleased - but it's a dam*ed good thing given the cost and headache I went through. We went for a mountain blast this AM. Had a very cool 5 mile race with a new M3 on some very twisty roads. Makes it all seem worth the effort.

I read back some time ago in one of the Porsche mags about a turbocharger that used sealed bearings requiring no external oil flow. This would be a GREAT thing for aftermarket 911 turbos. I've got to revisit that article. You know about these?

turbo6bar · 08-16-2003, 12:13 PM

Quote:

Originally posted by RarlyL8
I read back some time ago in one of the Porsche mags about a turbocharger that used sealed bearings requiring no external oil flow. This would be a GREAT thing for aftermarket 911 turbos. I've got to revisit that article. You know about these?

das would be the Aerocharger VATN turbocharger. It has a self-contained oil charge. The two drawbacks are cost and size. You would need twin Aerochargers for most 911 applications. As I recall, it is one of the most efficient turbochargers on the market.

Definitely trick!!!

Jurgen

Mr Beau · 08-16-2003, 01:32 PM

Definitely trick, but they are also prone to failure...

As far as I know, they're not generally available any more. You might be lucky enough to have them serviced, but that's about it.

A self contained oil supply doesn't sound like the "hot" tip, especially since it's not easy to water cool the center section on a 911...

Definitely a cool project. It's a shame it took the factory so long to ditch the big singles and CIS. Saab in the '70s was more advanced than some of the turbos Porsche sold in the 90's (!).

Matt
'73 911E

Texas Turbo · Texas Turbo's Garage

Wow, that is one of the nicest motors I have seen. Congrats.

1fastredsc · 08-23-2003, 03:40 PM

I just finished reading about the vatn aerocharger, anyone know of a website that lists they're availability?

avendlerdp · avendlerdp's Garage

I have a question here. I have yet to own a Turbo flat 6 but have had several other turbo cars so I have thought about this a bit. The oil scavange from the turbo(s) on other cars is no problem due to the position of the turbo(s) letting gravity do the work, but on a motor where the turbo is lower then the sump I can see the issue. Here's my question: If the oil is fed to the turbo by the main oil pump, why not just route the drain line back into the system higher up and let the feed pressure push the oil out? As long as there is no obstruction the oil would have to leave the turbo would it not??

Just wondering...

Alex

Mr Beau · 08-23-2003, 07:03 PM

If there's any restriction in the drain line, the oil will build up around the seals and enter the compressor and/or turbine, creating a big mess.

350HP930 · 08-23-2003, 07:03 PM

Turbo seals and center sections are not designed to be filled with oil.

They must properly drain or the shaft will have to deal with unneccesary drag and its seals will be saturated and leak. For this reason the turbo oil drain usually also needs to act as a vent.

For this reason you must run the drain to a vented pick up point that is lower than the turbo.