In this video, I troubleshoot a low-boost problem on my 1987 Porsche 944 Turbo (951). The car is finally running well again, but there’s one major problem — even at wide-open throttle, I can’t get more than about 5 or 6 pounds of boost.
I had a few theories.
First was the Lindsey Racing manual boost controller. Could it simply need to be turned up? That seemed possible, but the car made considerably more boost before all of the recent work, so I didn’t want to start adjusting the boost controller without figuring out why things had changed.
Next I looked at the blow-off valve. If the BOV piston was opening too easily or allowing boost pressure to leak past it, that could potentially explain why the turbo wasn’t building the boost it should.
But what I eventually found had me scratching my head.
The clamp securing the large hose coming off the turbo had completely come off! That meant the connection could leak under boost — and potentially create a vacuum leak as well.
I repositioned the hose, properly secured the clamp, checked everything over and took the 944 Turbo back out for another test drive.
What a difference!
The car is building boost again and driving MUCH better. Sometimes the simplest problem can cause symptoms that send you looking in completely different directions.
If you’re troubleshooting low boost, boost leaks, vacuum leaks, a manual boost controller, wastegate or blow-off valve issues on a Porsche 944 Turbo, hopefully this video gives you another place to look.
If you enjoy DIY Porsche, Audi and other automotive repair and troubleshooting videos, consider subscribing to NCGermerican. There’s plenty more to come as I continue sorting out and improving the 944 Turbo.
#Porsche944 #Porsche944Turbo #944Turbo #Porsche951 #Porsche #BoostLeak #Turbo #LowBoost #DIYAutoRepair #NCGermerican
DISCLAIMER:
I am not a professional mechanic. This video is intended for informational and entertainment purposes only and documents my own experience working on my vehicle. Automotive repairs and modifications can involve significant risks. If you choose to perform any repair or modification shown in this video, you do so at your own risk. Always use appropriate tools, safety equipment and procedures, and consult a qualified professional when necessary. I assume no responsibility for injury, vehicle damage, or other losses resulting from attempting any work shown or discussed in this video.
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Glad you found the problem
The air coming back through the airbox was probably from the idle stabilizer
If you are having clamping issues try use T-bolt clamps. They hold way better under pressure.
Glad she is running and driving much better. With some cars it helps to have the engine at a certain rotation point when doing the boost least tests to reduce the amount of air that flows out of the motor.
It was about time!! Well done! And it didnt cost a penny!
Must be a good feeling. Congrats on getting it working as it should!