Passat (B5) :: 2000 - Boost Decreases To 5 Psi / Oil Cooler Needed?


Apr 22, 2008

I've got a 2000 passat 1.8t (ATW) Tiptronic with a GIAC chip a trubo smart bov and a new performance boost gauge. I've got a problem. My gauge habitually indicates me that i peek to around 15psi to after drop to around 11 but if i drive my car to hard for to long or i get to around 180kph, my boost decreases instantaneously to 5 psi. After, the only way to regain my boost is to let the car cool down on idle for 2min an then turn it off for 2min.

After that, every thing comes back to normal. If I don't do that, the car wont regain boost. You can drive like a grand-mother for 45 min and put your foot down you'll still see the boost go up to 5psi and just stop increasing. It's like it set itself an other max boost limit. I though it could be some sort of a safe mode because the turbo is over heating (it's red hot). I thought a oil cooler could maybe resolve the problem but i don't want to spend 200buck on that if it doesn't do anything.

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I have done the following to try and fix problem and some cause it was just time to replace:

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Passat (B5) :: Car Seems Surging On And Off Boost After Got Hit

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My wife hit a deer going 60MPH 3 hours from home. Go back up and pick up the car, it's down on power, I feel it surging on and off boost, hard to drive smooth. Roughly a half hour later I get a CEL. Don't have the code handy, but Boost limit Maximum exceeded. My local VW dealer says its a normal wear and tear item so Allstate will not cover it. The car had the radiator, radiator support, condenser, hood, bumper, grill, passenger fender, timing belt cover and timing belt replaced.

Allstate says not covered, like a flat tire, once I leave the shop, its like a flat tire on the road, nothing to do with the repair. BTW I had it repaired at an Allstate recommended PRO shop. I get it back tonight after 8 weeks of fooling around. Will need to check the actuator, hopefully it's bad. The turbo itself is good, boost fine, no smoke.

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