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| Turbo Slug gets a few things fixed (Page 1/1) |
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Frenchrafe
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JUN 07, 05:52 AM
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Hello everyone.
Just a few annoying fixes and mods that I've had to do these last couple of months to keep a 400HP Fiero road and track worthy 😉:
Thanks for watching👍
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"Turbo Slug" - '87 Fiero GT. 3800 turbo. - The fastest Fiero in France! @turboslugfiero
https://youtu.be/c4Cu7_2OgYc[This message has been edited by Frenchrafe (edited 06-07-2023).]
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Patrick
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JUN 07, 06:09 PM
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Rafe, because I'm not at all familiar with the 3.8, I don't quite understand why your oil catch can couldn't be adapted to a closed system, as opposed to venting to the atmosphere. You mentioned that the capacity of your factory PCV system was already "overpowered" (overwhelmed?) and couldn't "cope with the flow". I suppose that's the reason you've gone the route you have, but can't that be rectified somehow?
I went through something similar when I bought my '98 JDM Subaru Impreza WRX STi a few years ago. When I removed its TMIC, I noticed there was oil in it. I then went on a quest to figure out how to install an oil catch can system. I found an incredible amount of misinformation online regarding catch cans and PCV systems. I eventually made my own oil catch cans (installed two) using my own (rather unorthodox) design, and plumbed them into my system using my own custom routing. The last time I removed my TMIC, it was completely oil free. I was quite pleased!
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Frenchrafe
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JUN 08, 02:05 AM
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Salut Patrick!
Yes I realise that most people use the stock PCV system on their 3800 motors. And yes, the internet is full of misinformation on catch cans!
Even Darth Fiero (who did the PCM and tune) recommended just keeping the PCV system.
When I built the engine 10 years ago, I had the rocker covers venting to atmosphere and I blocked all the air passages for the crank case venting (throttle body and LIM PCV passage). Which eliminated a few problems with the boost pressure going into the engine.
However, over time the oil vapours just condensed and accumulated arround the two vents making a mess. Even dropping down onto the exhaust manifolds!
With engine rebuild No1, I decided to reinstall a working PCV. This just didn't work for me; I blew out the rocker cover gaskets on very hard acceleration. PCV overwhelmed!
Maybe I have too much piston ring blow by under load? Whatever, I'm not the only racer in Europe to have this sort of problem on his turbo engine. (It's not a specific 3800 problem; my track friends have this on BMWs, Fords, Peugeots, etc...)
So I said to myself: "Study the problem and find a cheap solution that doesn't get you banned for oil dripping on the track!"
The problem with venting close to the engine is that you can't cool down the oil vapours to let the oil separate out while still letting the excess pressure out.
By putting in some long hoses and then a baffled container, the air charged with oil has the time to cool enough. In fact, I have very little oil finally in the catch can and the air that comes out of the top is oil free and OK to be vented.
To answer your last point, I can't put this "clean" air back into the intake system. It's just not pratical for my setup to route this all the way over to the turbo intake. And as long as the car passes inspection (contrôle technique) here in France, I'm not going to bother with still more hoses and junctions!
Cheers,
Rafe
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"Turbo Slug" - '87 Fiero GT. 3800 turbo. - The fastest Fiero in France! @turboslugfiero
https://youtu.be/c4Cu7_2OgYc[This message has been edited by Frenchrafe (edited 06-08-2023).]
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