924Board.org

[John Brown]

We did well and were pleased with our progress with the car last weekend. It was the largest 44Cup field ever with 26 cars in Cup and another dozen in Supercup. I think there were 39 or 40 total. Plus the other series running. So around 55 or 60 cars on track for the race.

As from the initial shakedown in March DE at SP when we ran 136s LJ got down to 131.7 during Sundays race. He did very well in his fourth ever race.

It would have been good for 7th place until an oil leak developed half a lap into what turned out to be the last lap! For those familiar with SP the leak started around turn 3. LJ noticed the smoke immmeadiately, certainly an attaboy for him. He made the wise decision to pit immeadiately. Once the car was stopped the oil did 'cook off' and LJ hit it with the monobromotriflouromethane. (I still like Halon over any other - you cant' tell it was set off). Lots of self recrimination afterwards as he saw the checker as he came down the pit lane. But it was the right thing to do.

No time yet to see exactly what let go. We do have oil pressure and the motor runs fine. Clearly a leak.

So we found a bit over 4 seconds so far. Another 4 will put us on the top of the podium. And there is always VIR, where the longer straights and high speed sections will perhaps play into the turbos' strength.
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82

[924RACR]

Doh! Good work by LJ on the quick shutdown, that's quick thinking. Better to throw away $500 worth of Halon than $5000+ of racecar!

No doubt it's one of those pesky external oil lines - they're always vulnerable.

What sort of oil line plumbing do you have now? Is it all still stock, or have you converted any over to AN-style plumbing? I've been much happier with the robustness of the AN-style plumbing vs. the factory stuff...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[John Brown]

Not yet. Interested in how you went about it.

There are some really good pictures of all those 944s and 924s racing. Follow the link from the forums page of www.44cup.com
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82

[John Brown]

Good picture entering turn 5. Last lap you can see the smoke.

http://i57.photobucket.com/albums/g231/VetterSpeed/944cup/DSC_0562.jpg

Found the problem. The steel oil supply line to the turbo cracked about 2 inches from the fitting at the filter adapter. I have another. But as it's 25 years old also; anyone have a better idea? Wonder what they cost new, if available?
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82

[924RACR]

Wow, that's impressive!

There should be no relative motion there; I wonder if there's any chance you got a torque into it while tightening?

With such little space, it wouldn't be easy to work in a replacement with aftermarket plumbing (braided stainless hose) unless you've done a complete aftermarket workover on the oil cooling plumbing. OTOH, that could be the perfect excuse to completely do it aftermarket; pull off the existing adapter/oil filter mounting plate, and use a remote filter mount as I am (though in a different location). Then you'd have much better access point to take clean, cool, pressurized oil to send into the turbo - just use a tee on the return line to the block, after the cooler (I have my filter plumbed in before the cooler).
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype

[John Brown]

Probably. The line did not lay precisely flat and getting the banjo started was always a problem.

Yeah, I don't see any flexible line with a heat rating that looks really adequate for that location. Even just coming into the fitting on top of the turbo bearing housing is pretty close to the heat. How did you handle that?

Local dealer just told me the good news: $213.88 Hey, that was good news, I'd have gladly paid.

The bad news: part no longer available.

So, where did you mount the filter on your turbo oh guru?
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John
80 931 - #931 44Cup
99 Escalade - tows track cars
gone but not forgotten: original 924.org car - 82

[924RACR]

Both my turbos are still stock - sorry! Still no idea what we're going to do for the (81) project car, because that's a long way away from getting either a turbo or an upgrade. Would be nice to do it all custom, 951/GTR style, over on the other side under the intake - but we'll probably just do a pretty stock rebuild to start with...
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Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype