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Registered
Join Date: Nov 2003
Location: Richmond Hill, Ga (Savannah)
Posts: 45
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930 vs 911 power assisted braking
I am currently working on boosting (supercharging) a 3.0L. The 911, in it's current configuration, has power assisted braking which runs off of vaccum. How did Porsche run brake assist on boosted engines, ex. 930's?
thanks!! |
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12-06-2003, 12:00 PM
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Registered
Join Date: Jun 2003
Location: St Petersburg, FL
Posts: 3,814
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All cars (NA and Boosted) only have vacuum during partial throttle so nothing changes.
The check valve on the booster allows the chamber to evacuate during moments of low manifold pressure for those moments when brakes might be needed under boost though most cars should be off the throttle and providing vacuum when braking is needed. |
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12-06-2003, 12:19 PM
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Crotchety Old Bastard
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The check valve for the 930 brakes is an in-line item. You could easily use it on your boosted SC. I use one on mine. Works perfectly.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds '78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8 |
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12-06-2003, 06:08 PM
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Registered
Join Date: Nov 2003
Location: Richmond Hill, Ga (Savannah)
Posts: 45
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As always, thanks!
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12-06-2003, 06:13 PM
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Registered
Join Date: Nov 2003
Location: Richmond Hill, Ga (Savannah)
Posts: 45
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Thanks!!
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12-06-2003, 06:24 PM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
