I've seen plenty of these problem threads but I haven't found info for my particular case.
My boost is going up to 1.1 Bar with a wastegate set to 0,7. I changed to a wastegate which i know works and is set to 0,6, but I'm still overboosting to 1,1.
I've seen the same result with 2 boost gauges (physical ones, not electronic).
No leaks, turbo flap is moving smoothly without getting stuck, wastegate vacuum tube is fine and tight.
I have no idea what can cause this.
Double check for boost leaks
Run a new vacuum hose from boost source (comp housing is best) directly to wastegate)
Try running with the wastegate disconnected from the flap and see if you still build boost
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What boost control do you have and is it stock turbo and wastegate ?
No leaks 99.99% sure. Although a leak would actually underboost or stay the same if small.
I already have the stock vacuum tube from the comp housing to the wastegate. It's stock turbo and wastegate. No boost control besides that.
I did not try running with a free flap though, might be a good idea. If it still overboosts it might be an obstruction. Could it be the heat is making the flap stick to the housing?
If you have an aftermarket elbow, it could stop the flap from opening fullyOriginally Posted by suixo
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Fit a stage 1 chip and ignore it??
Lol i wish it was that easy.
I have a stock elbow Jay, and moved the flap by hand. It moves fine.
I tried a 3rd boost gauge today. At first it opened at 0,8 Bar which is an improvement, after a while of driving it got to 0,9-1 Bar. Still an improvement since it doesn't go above 1 anymore. Maybe it's just the mechanical gauges which are....really bad...
I'll get myself an electronic one and see if it changes. I hope it's just bad reading.
It's worth noting the 3rd gauge is the same brand and model as the 2nd. Vacuum reading even makes more sense. I guess the one I bought was bad from the start or near that.
Something else you could try is pressurising the actuator itself and see how much the flap opens. The diaphram in it might be on its way out/leaking, which can cause a boost increase.
I had this issue before, new actuator fixed it
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I already did. This wastegate is 100% functional. I'm gonna install an electronic boost control as well as the gauge and we'll see.
An electronic boost controller can't reduce the boost any lower than actuator pressure, so if the actuator is already boosting to 1 bar the EBC won't help.
Are you using a stock or an adjustable actuator?
Today it worked. 0.8 Bar stable with some spikes to 1 Bar. It's definitely the old gauge reading wrong. EBC will reduce the spikes.
What gauge are you using?
Always advisable to use a good quality, genuine gauge.
Quality aside I think I was just sold a broken one. The one I tried is the same brand but works. Its a Dragon or something like that, from cheapBay. I got a electronic STRI from a shop here, same as my oil temp and pressure, but there's no more in stock, I'll have to wait a few weeks.
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