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Old 11-07-2001, 02:19 AM   #1
LVSUBARU
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Default Boost controlers

I've heard that manuel boost controlers don't work well with boost under 10 psi. Is this true? How do they not work well? I want to run 5-8 psi. Thanks.
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Old 11-07-2001, 09:44 AM   #2
kastle
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Manual boost controlers are designed to work on high boost applications, 12psi or better (IIRC). Using a MBC on a low boost application will (as it has been proven to me) blow you engine.

I had the misfortune of being in AaronB's car when the MBC spiked from 5psi up to 15psi. Not a good thing. Aaron's car still isn't running and the engine blew back in May.

If you want to run 5 to 8 psi, then you don't need a MBC. You can accomplish easily with a properly set wastegate.
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Old 11-07-2001, 09:56 AM   #3
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Interesting, especially since I've been running an MBC for well over 2 years. Haven't "blown up" yet.

Steve
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Old 11-07-2001, 11:34 AM   #4
kastle
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I'm rather glad that there are people out there who haven't managed to destroy their engines running a MBC with a low boost application. I'm guessing you don't ever mess with it Steve......
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Old 11-08-2001, 02:12 AM   #5
LVSUBARU
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I've been checkin out the kind with the solinoid, so you can have two levels of boost. One is controled by a switch. You guys know which one I mean? What do you think about that? Maybe cruising at 5 psi, and flip the switch ans be at 7 psi.
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Old 11-08-2001, 02:13 AM   #6
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Now that I've seen that writen down it seems kinda stupid.
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Old 11-08-2001, 10:58 AM   #7
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It's not stupid, but it's not going to be that easy without some type of smart engine management. Adding a couple of PSI to an already stressed system (i.e. S-AFC + RRFPR) might be disastrous. But if you had some type of decent engine management system (TEC-II, Haltech, etc.), doing something like this should be possible. As long as the system could realize the different boost level and deal with it appropriately, having a "moderate" and "high" boost option would be really great.

Steve
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