Compressor surge....

[the jdmchop]

oem IX bov is sweet!

[audiko4]

Originally Posted by 4door89
it would be nice if you posted the link where you got that info....

ha

i was gonna say that too lmao

Here ya go
http://www.hksusa.com/categories/more.asp?id=1062

[onepointfivebar]

I had surge to, find an older style greedy type s. It has 2 fitting top fitting goes to vacumn and the side fitting goes to the charge pipe. that way they are fighting each other. surge is gone.

[OneSikDC]

i watched a video last nite on you tuw. compression surge will screw up your turbo big time

[c20h25n3o]

Update for anyone looking at this thread for technical information:

Turns out that i didnt have my BOV vacume lines (two of them) hooked up to a good enough vacume source.

I hooked two 1/4 inch vacume lines directly to the intake manifold and the bov functions 100% :D

[Rob]

There's your problem. The hks bov sucks. Lol. Every Sti/wrx in the US has it too :eek:

HKS BOV or BPV? 2 different things. And its good up to 20 PSI for STi's.

To fix the compressor surge, I think you can fix it with a tune. My friend had a compressor surge when he installed an FMIC. Then after a simple tune it was gone.

[c20h25n3o]

HKS BOV or BPV? 2 different things. And its good up to 20 PSI for STi's.

To fix the compressor surge, I think you can fix it with a tune. My friend had a compressor surge when he installed an FMIC. Then after a simple tune it was gone.

Tune? LOL

Whats your exact definition of "tune"?

[Rob]

Tune? LOL

Whats your exact definition of "tune"?

I'm not sure about Hondas but I know in WRX's, all you need to do is tune the ECU and changing some numbers will remove Compressor surge. But I'm pretty sure it may be the same thing.

[DOHCtor Miguel]

I'm not sure about Hondas but I know in WRX's, all you need to do is tune the ECU and changing some numbers will remove Compressor surge. But I'm pretty sure it may be the same thing.

I don't understand how that is possible. Surge is mostly cause mechanically so a "tune" couldn't fix it. Its like saying tune the car to fix an exhaust leak.

[Rob]

Well compared to the TMIC, the air has a longer ways to travel causing more turbo lag. I think it has something to do with the timing that causes the surge, which the timing could be tuned. I am just starting to get into the Honda/Acura engines so maybe its alot different. But I know alot about turbos so I figure its really similar.

[DOHCtor Miguel]

Well compared to the TMIC, the air has a longer ways to travel causing more turbo lag. I think it has something to do with the timing that causes the surge, which the timing could be tuned. I am just starting to get into the Honda/Acura engines so maybe its alot different. But I know alot about turbos so I figure its really similar.

Well that might makes sense but I'm not sure on it. I've been in the Honda's but not too long in the boost game tho.

[khmboostedeh2]

Well compared to the TMIC, the air has a longer ways to travel causing more turbo lag. I think it has something to do with the timing that causes the surge, which the timing could be tuned. I am just starting to get into the Honda/Acura engines so maybe its alot different. But I know alot about turbos so I figure its really similar.

You're going to have to research that more and post back because I don't see how 'timing causes the surge.' The only thing I can think of that would suit your post would be an anti-lag setup that doesn't allow surge because it pushes the turbo to keep 'boosting'.

Its a matter of the throttle plate closing, turbo still spinning and unable to push more air in through the pipes since there's no way for the air to escape (ie bov doesn't exist or doesn't open).

[Rob]

khm, I will do research on it. "Its a matter of the throttle plate closing, turbo still spinning and unable to push more air in through the pipes since there's no way for the air to escape (ie bov doesn't exist or doesn't open)." Yea, so basically what you said was correct, the turbo spinning causes compressed air to be entered into the engine, but once the driver lets go of the gas, that closes and the air is trapped, therefore a BOV/BPV is necessary to release this pressure, or else it will cause the Turbo to spin the other way. I still need to get the terms right, but the thing that closes after the driver gets off the gas, is controlled by the ECU(I'm pretty sure and have to look this one up)

I will still do research.

But for OP, the reason you get compresser surge is due to trapped pressure. The compressed air under 2psi does not trigger your BOV, therefore the compressed air stops and have no where to go except back through the turbo in the opposite direction.

This can be bad for your engine, but I don't think at 2psi, you can be doing that much damage.

Solutions, I think as a solution, try installing a BPV(Bypass Valve), this recirculates all excess pressure from your engine back to your turbo so you keep it spooling. Yes it doesn't make the nice "hushhh" noise but it will allow you to keep boost and remove your compressor surge too.

[tepid1]

This is like a battle of what is really going on....

He is getting compressor surge. Great. It's not bad for anything except the turbo. It puts additional stress on the throttle plate, but remember it's only 2psi which is hardly any force.

The reason for the surge is due to a force and demand battle. You are adding opposing forces on both sides of the CHRA (center section on turbo). This force is most likely greater on the exhaust side, due to being a sealed system. It wins the battle and forces the air to reverse and cavitate or surge. Think of it like a pump. With nowhere for the air/fluid to go it keeps pounding air in. The friction of the charge increases the air temperature. It doesn't spin backwards.... the exhaust side force/load prevents that from happening.

There is a lot of misinformation going around in this thread. That and restating what others have said, but putting your own little spin on it.... Yes, that's you Rob.

[c20h25n3o]

As i posted before guys, it has been fixed. Not that i want to stop the discussion, but now my BOV vents when i realese the throttle at even -10 boost.

A good BOV/BPV shouldnt cause ANY surge, thats the point of it, right? :rolleyes: