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Banned
Join Date: Feb 2006
Posts: 197
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boost/overboost sensors?
guys do these sensors determine when the boost comes on?
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06-13-2006, 09:59 AM
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resident samsquamch
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,815
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In a 930, no. It's a saftey switch/relay setup to cut the fuel pumps should you exceed a certain boost level (not sure what that is). On a 930 model, the pressure switch is located on the large BOV housing on the driver's side.
Things (efficiencies) like your turbo, headers, I/C, etc. determine when you actually begin spooling (boosting).
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-jeff back in the saddle: '95 993 - just another black C2 *SOLD*: '87 930 GP White - heroin would have been a cheaper addiction... "Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP  )
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06-13-2006, 10:15 AM
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resident samsquamch
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,815
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How quickly you are attmpting to accelerate also plays a part. If I stay easy on the gas, I can keep my turbo (for the most part) from spooling. If I really get on it, that lovely whistle begins to sound!
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-jeff back in the saddle: '95 993 - just another black C2 *SOLD*: '87 930 GP White - heroin would have been a cheaper addiction... "Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP )
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06-13-2006, 10:19 AM
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resident samsquamch
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,815
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Keep in mind that with turbocharging, the first line of over-boost saftey comes from your waste gate. The larger (heavier) the spring, the more boost that's allowed to flow/accumulate in the charge system. The lighter the spring, the quicker the boost begins to dump/exit.
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-jeff back in the saddle: '95 993 - just another black C2 *SOLD*: '87 930 GP White - heroin would have been a cheaper addiction... "Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP )
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06-13-2006, 10:22 AM
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Crotchety Old Bastard
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Stock 930 overboost switch cuts the pumps at 1.1-1.2 bar. If you replace the stock spring with a 1.0 bar spring you may bump the overboost switch. Just one more reason not to do that.
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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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06-13-2006, 05:46 PM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
