Turbo not fucntioning?
12-25-2002, 10:39 PM
#1
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Join Date: Dec 2002
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Turbo not fucntioning?
I recently bought my first stocked 951(1986) @ 8500 USD. Having owned a fully-mod WRX back in Singapore, i am desperate for power with my 951 now; but i am now an idiot with Porsche cars.
Can anyone help me with the following problems i encounter:
1. I find the car under-power and i suspect the turbo isnt working after all. Even though the stock boost gauge reads 1Bar of boost, I dont feel ****. What could of gone wrong? ----- CPU? entire Turbo system? engine wear????
2.Steer - the steering is not precise, by the way; is this model equipped with POWER STeering???
3. Anyone knew any Porsche Specialist in Taiwan?
Can anyone help me with the following problems i encounter:
1. I find the car under-power and i suspect the turbo isnt working after all. Even though the stock boost gauge reads 1Bar of boost, I dont feel ****. What could of gone wrong? ----- CPU? entire Turbo system? engine wear????
2.Steer - the steering is not precise, by the way; is this model equipped with POWER STeering???
3. Anyone knew any Porsche Specialist in Taiwan?
12-26-2002, 03:31 AM
#2
Race Director
Welcome aboard !!!
"1. I find the car under-power and i suspect the turbo isnt working after all. Even though the stock boost gauge reads 1Bar of boost, I dont feel ****.
The gauge on the dash reads absolute atmospheric-pressure. So 1-bar is zero boost, just 1:1 volumetric efficiency. Stock boost should be reading 1.8-bar on the gauge.
Couple of possibilities:
- boost-gauge is bad or stuck: not likely because you actually don't feel any kick from the boost, so the 1-bar reading is probably accurate.
- leaking wastegate: this would dump all your exhaust pressure out the tailpipe and nothing's left to drive the turbo. Go for a gentle drive and feel the short section of pipe between the wastegate and the dump to the exhaust. If it's warm, then your wastegate is leaking.
- bad turbo: remove your intake and spin the turbo by hand. It should be smooth turning with no binding anywhere throughout the entire 360-degree rotation. Axial & lateral play shouldn't exceed 0.25mm.
"2.Steer - the steering is not precise, by the way; is this model equipped with POWER STeering???"
Yes, it comes with power-steering. Check your tire-pressures and get a 4-wheel alignment. Add 1-degree to the stock caster-specifications to about 3.25-3.50 caster for more self-centering action.
"3. Anyone knew any Porsche Specialist in Taiwan?"
Wanna fly me out? I need to visit some herbal-medicine specialists for my asthma!
"1. I find the car under-power and i suspect the turbo isnt working after all. Even though the stock boost gauge reads 1Bar of boost, I dont feel ****.
The gauge on the dash reads absolute atmospheric-pressure. So 1-bar is zero boost, just 1:1 volumetric efficiency. Stock boost should be reading 1.8-bar on the gauge.
Couple of possibilities:
- boost-gauge is bad or stuck: not likely because you actually don't feel any kick from the boost, so the 1-bar reading is probably accurate.
- leaking wastegate: this would dump all your exhaust pressure out the tailpipe and nothing's left to drive the turbo. Go for a gentle drive and feel the short section of pipe between the wastegate and the dump to the exhaust. If it's warm, then your wastegate is leaking.
- bad turbo: remove your intake and spin the turbo by hand. It should be smooth turning with no binding anywhere throughout the entire 360-degree rotation. Axial & lateral play shouldn't exceed 0.25mm.
"2.Steer - the steering is not precise, by the way; is this model equipped with POWER STeering???"
Yes, it comes with power-steering. Check your tire-pressures and get a 4-wheel alignment. Add 1-degree to the stock caster-specifications to about 3.25-3.50 caster for more self-centering action.
"3. Anyone knew any Porsche Specialist in Taiwan?"
Wanna fly me out? I need to visit some herbal-medicine specialists for my asthma!
12-26-2002, 12:44 PM
#3
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Join Date: Apr 2002
Location: Jacksonville, Florida
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A couple other things it could be - bad recirculating valve (blow-off valve). The membrane could be ripped, and the turbo wouldn't spool up.
Also, check for loose intercooler pipes/hoses.
Also, check for loose intercooler pipes/hoses.