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Join Date: Nov 2007
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newby please help 930 no boost

i have a 79 930 with 70k miles car has not been used much recently had it out and realized there was no boost, i have checked for a stuck wastegate and it seems fine i have replaced intercooler o ring and still no luck i have also checked the intake side of the turbo the shaft has no play and spins free. any ideas thanks
Old 11-10-2007, 05:10 PM
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I wonder if your recirc valve is jammed open.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 11-10-2007, 05:29 PM
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at the risk of sounding stupid, where is the recirc valve?
Old 11-10-2007, 06:30 PM
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Old 11-10-2007, 07:26 PM
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That would be under the intercooler.
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Old 11-10-2007, 10:43 PM
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Has to be the re-circ valve because the car would spit,sputter, and fart like a champ with an atmospheric boost leak. The re-circ valve creates a boost leak that doesnt violate the fuel metering's calculations. This is assuming it is not the wast gate being stuck open.
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Old 11-11-2007, 10:29 AM
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I would block off the exhaust with a rag while an assistant revs up the engine and I would listen at the wastegate dump pipe for any exhaust letting by.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 11-11-2007, 10:58 AM
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when I first got my 77, the valve in the waste-gate was cracked and would not seat fully....very low or no boost.
the seating surface was almost completely gone.
I found out when I took it to be dyno-ed for some baseline numbers.

Bill K
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Old 11-12-2007, 10:10 AM
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