[philipwrx]

Hello everyone im just a newbie on this beast 2015 wrx and still figuring out why is that i always get overboost everytime i drive my car aggressively. I only hit the gas maybe like 50 to 60% and yet i always got more than 20psi.but if i hit the gas slowly the turbo goes smooth no over boost.but when i hit the gas fast i got overboost.i know overboosti g js not good on the engine can you help me guys pls how to control this overboosting. Am i only the one who is exp. this scinario or its just a wrx thing? I need ur help subie fam thank you in advance..

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[XJman]

Tell us more about the car, parts, tune, conditions besides hitting the throttle. What gear?

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[philipwrx]

Car is stock sir. Gear 3rd and 4th sir.

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[BananaSammiches]

Does the boost spike momentarily or does it hold steady? What PSI are you hitting when you get over boost?

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[philipwrx]

Does the boost spike momentarily or does it hold steady? What PSI are you hitting when you get over boost?

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20 to 22.7psi sir. Nope it doesnt hold steady sir.

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[anarekist]

i think what it is that a momentary overboost is ok, car quickly compensates but the reading on the boost gauge still indicates you hit a boost peak of 20+ even if you were there for half a second.

 

[BananaSammiches]

i think what it is that a momentary overboost is ok, car quickly compensates but the reading on the boost gauge still indicates you hit a boost peak of 20+ even if you were there for half a second.

You beat me to it. Boost spikes happen sometimes. As long as they're not sustained and don't happen often, I'd say you're okay. I hit almost 19 PSI when I still had my TD04, but it was an isolated incident. If you start seeing that your car is over-boosting and holding steady at that PSI frequently, then it's time to start digging to see what the issue is.

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[philipwrx]

i think what it is that a momentary overboost is ok, car quickly compensates but the reading on the boost gauge still indicates you hit a boost peak of 20+ even if you were there for half a second.

Oh see well that make sence to me now. But sometimes sir i feel clugging on my engine everytime i hit overboost it happen twice already.

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[BananaSammiches]

How are you driving it when this happens? Are you stomping on the throttle at low RPMs?

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[philipwrx]

How are you driving it when this happens? Are you stomping on the throttle at low RPMs?

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Nope sir 3.5krpm when im hitting it sir

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[BananaSammiches]

Just keep an eye on it. If it starts to become a chronic issue then you can start worrying. Most commonly, over-boosting it's caused by a wastegate issue, but seeing as your car is only a couple of years old, I highly doubt that there's anything seriously wrong with it, especially since it's still stock.

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[philipwrx]

Just keep an eye on it. If it starts to become a chronic issue then you can start worrying. Most commonly, over-boosting it's caused by a wastegate issue, but seeing as your car is only a couple of years old, I highly doubt that there's anything seriously wrong with it, especially since it's still stock.

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Waste gate? How can i check it sir or clean it?

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[BananaSammiches]

The wastegate is built into your turbo. There are also external wastegate, but for your purposes we'll just talk about the internal one. It is a valve that opens and closes to divert exhaust gasses from the exhaust turbine in order to control your boost pressure. There is an actuator which has a spring that is used to control the opening and closing of the valve by way of your boost control solenoid. If your boost is consistently not being properly controlled, it could be a problem with the vacuum lines running from the boost control solenoid to the turbo, or a problem with the wastegate itself.

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[philipwrx]

The wastegate is built into your turbo. There are also external wastegate, but for your purposes we'll just talk about the internal one. It is a valve that opens and closes to divert exhaust gasses from the exhaust turbine in order to control your boost pressure. There is an actuator which has a spring that is used to control the opening and closing of the valve by way of your boost control solenoid. If your boost is consistently not being properly controlled, it could be a problem with the vacuum lines running from the boost control solenoid to the turbo, or a problem with the wastegate itself.

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Ok sir copy that il check those things right away thank you so much sir

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[BananaSammiches]

No problem. Good luck!

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[sis.q.mountain.girl]

I have a over boost problem as well and my cobb tuner says 26 psi out of nowhere the. Boom I thot I blew a tire but no it's oil everywhere and I'm waiting for a tow.also my Af learn was at 6.25 steady. Is my car ruined now. ? Yes I am a newbie. Car is a 2016 wrx with 54 k miles and has aftermarket parts

 

[XJman]

I have a over boost problem as well and my cobb tuner says 26 psi out of nowhere the. Boom I thot I blew a tire but no it's oil everywhere and I'm waiting for a tow.also my Af learn was at 6.25 steady. Is my car ruined now. ? Yes I am a newbie. Car is a 2016 wrx with 54 k miles and has aftermarket parts

Maybe. There isn't enough information in your post to determine that.

 

[sis.q.mountain.girl]

What kind of other info? I have 2 oil catch cans that are add W1 catch cans on both sides and changed my oil to find them both full. I got the car with 50k miles and now has 51k miles. It has a axel back high flow cat and not sure what brand waste gate and blow off valve are but they are up graded too. My cobb tuner moments before it blew Said 26psi. And I was on free way under normal acceleration when it blew. I saw it was 26 when getting on free way 10 min before that but was not pushing it hard . Anything else that may help plz let me know. I greatly appriecate any info at all because like I said I have never owned this new of a subie I have a 05 wrx and a gc rally build. The direct injection is new to me and don't know allt about the newer 15+ models. Thanks

 

[sis.q.mountain.girl]

It's was a typo in previous post at 54k miles it only has 51 k miles

 

[sis.q.mountain.girl]

It's was a typo in previous post at 54k miles it only has 51 k miles

Also the AF learn prior to this was sticking at 6.5 but AF correction was going to zero when coasting like what I read said was good ??? Fine knock is 0.0 and DAM is 1.0 consistently