Compressor surge with new SRI?
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Compressor surge with new SRI?
First of all, I know I'm a newbie. This is even my first post lmao. I'm 16 and really grateful that I have an evo x. I may not be the brightest person you meet online nor the most handy, but here's what I got. Today I installed a custom fitted SRI for my evo. It sounds quite amazing, 
. When I let off the throttle at low boost however, I get a sound that can be compared to compressor surge. It just started occurring when I put this intake in. I can't really hear the BOV release when this sound occurs but it opens up at mid and full boost with ease. I "reset" the ECU after installing it just because some people agree with it, some say it doesn't do anything, but it only took a little time to do. The only other mods I have is a straight pipe after the cat, and a turbosmart dual port BOV, Fully atmospheric. Anyone have any ideas/suggestions?Again, some of you guys are probably laughing your *** of at me for being new, but we all gotta start somewhere right? Lol . Thanks everyone in advance for the answers!
-Bill
. When I let off the throttle at low boost however, I get a sound that can be compared to compressor surge. It just started occurring when I put this intake in. I can't really hear the BOV release when this sound occurs but it opens up at mid and full boost with ease. I "reset" the ECU after installing it just because some people agree with it, some say it doesn't do anything, but it only took a little time to do. The only other mods I have is a straight pipe after the cat, and a turbosmart dual port BOV, Fully atmospheric. Anyone have any ideas/suggestions?Again, some of you guys are probably laughing your *** of at me for being new, but we all gotta start somewhere right? Lol . Thanks everyone in advance for the answers!-Bill
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Joined: Aug 2012
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From: WI
While I'm new to the EVO myself, I'm not new to factory turbo cars.
I can tell you that often times, low boost or part throttle situations don't create the pressure to fully open a blow off valve and this will create that, "ch ch ch" sound. With partial throttle driving its not a super huge concern. It becomes a concern when a BOV does that on higher load situations like WOT (wide open throttle). When you shift during WOT runs, it should never chatter. Many BOVs have adjustment screws that you can use to adjust the spring tension should you run into that situation.
Your bigger problem may be having an atmospheric BOV. They really are more trouble than they are worth. ESPECIALLY if you aren't tuned (didn't see that you are). When your BOV lets all that air out, you're creating a very rich situation which will often make the car stutter. This is bc all that metered air that the car's computer sent fuel for is gone and you are kinda like drowning the engine in fuel. Not exactly a good thing.
You might consider getting a BOV that you can recirculate. Ideally you should get tuned also bc now that you have changed the intake, the MAF (mass air flow) sensor is probably giving funky readings. They are very sensitive.
Good luck.
I can tell you that often times, low boost or part throttle situations don't create the pressure to fully open a blow off valve and this will create that, "ch ch ch" sound. With partial throttle driving its not a super huge concern. It becomes a concern when a BOV does that on higher load situations like WOT (wide open throttle). When you shift during WOT runs, it should never chatter. Many BOVs have adjustment screws that you can use to adjust the spring tension should you run into that situation.
Your bigger problem may be having an atmospheric BOV. They really are more trouble than they are worth. ESPECIALLY if you aren't tuned (didn't see that you are). When your BOV lets all that air out, you're creating a very rich situation which will often make the car stutter. This is bc all that metered air that the car's computer sent fuel for is gone and you are kinda like drowning the engine in fuel. Not exactly a good thing.
You might consider getting a BOV that you can recirculate. Ideally you should get tuned also bc now that you have changed the intake, the MAF (mass air flow) sensor is probably giving funky readings. They are very sensitive.
Good luck.
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Joined: Dec 2012
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From: USA
While I'm new to the EVO myself, I'm not new to factory turbo cars.
I can tell you that often times, low boost or part throttle situations don't create the pressure to fully open a blow off valve and this will create that, "ch ch ch" sound. With partial throttle driving its not a super huge concern. It becomes a concern when a BOV does that on higher load situations like WOT (wide open throttle). When you shift during WOT runs, it should never chatter. Many BOVs have adjustment screws that you can use to adjust the spring tension should you run into that situation.
Your bigger problem may be having an atmospheric BOV. They really are more trouble than they are worth. ESPECIALLY if you aren't tuned (didn't see that you are). When your BOV lets all that air out, you're creating a very rich situation which will often make the car stutter. This is bc all that metered air that the car's computer sent fuel for is gone and you are kinda like drowning the engine in fuel. Not exactly a good thing.
You might consider getting a BOV that you can recirculate. Ideally you should get tuned also bc now that you have changed the intake, the MAF (mass air flow) sensor is probably giving funky readings. They are very sensitive.
Good luck.
I can tell you that often times, low boost or part throttle situations don't create the pressure to fully open a blow off valve and this will create that, "ch ch ch" sound. With partial throttle driving its not a super huge concern. It becomes a concern when a BOV does that on higher load situations like WOT (wide open throttle). When you shift during WOT runs, it should never chatter. Many BOVs have adjustment screws that you can use to adjust the spring tension should you run into that situation.
Your bigger problem may be having an atmospheric BOV. They really are more trouble than they are worth. ESPECIALLY if you aren't tuned (didn't see that you are). When your BOV lets all that air out, you're creating a very rich situation which will often make the car stutter. This is bc all that metered air that the car's computer sent fuel for is gone and you are kinda like drowning the engine in fuel. Not exactly a good thing.
You might consider getting a BOV that you can recirculate. Ideally you should get tuned also bc now that you have changed the intake, the MAF (mass air flow) sensor is probably giving funky readings. They are very sensitive.
Good luck.
Thank God I found someone nice on a forum,
. I guess it's all luck in finding nice people haha, . The BOV I have gives you a choice. You can run it 50/50 (stock out of the delivery box), fully atmospheric, or fully recirculatory. Should I make it 50/50 Again? It's not a big project, just a matter of unplugging a tube and reattaching a small tube on the BOV. I wasn't concerned because it only occurred on light boost (and I mean very light boost), but it's definitely worth changing if that's happening. Or should I just loosen the tension up ? Either way, it's a five second job, so it's not a big deal, . I would love to get a tune but being my age I have slight limited funds, 
. how much is a good tune usually? I'm in CT and some people on the Internet have said they payed $150 for 3 pulls, yet places around here are charging $450 for five pulls (three of them being the actual tuning process and two being the base and final)
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Joined: Aug 2012
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From: WI
Personally, I would run it fully recirculated. Since thats how the car was designed to run, it would perform best that way (in your situation at least). You should still hear the sound it makes if its recirc'd which is what I'm sure you're after.
Since I'm new to the Evo crowd, I'm not sure on the details of pricing on getting a good tune. The only sound advice I could offer is that you do your research before you let anyone touch your car. Thankfully a place like this forum should have myriad sources of info on where you can obtain a good tune in your area.
Since I'm new to the Evo crowd, I'm not sure on the details of pricing on getting a good tune. The only sound advice I could offer is that you do your research before you let anyone touch your car. Thankfully a place like this forum should have myriad sources of info on where you can obtain a good tune in your area.
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From: USA
Personally, I would run it fully recirculated. Since thats how the car was designed to run, it would perform best that way (in your situation at least). You should still hear the sound it makes if its recirc'd which is what I'm sure you're after.
Since I'm new to the Evo crowd, I'm not sure on the details of pricing on getting a good tune. The only sound advice I could offer is that you do your research before you let anyone touch your car. Thankfully a place like this forum should have myriad sources of info on where you can obtain a good tune in your area.
Since I'm new to the Evo crowd, I'm not sure on the details of pricing on getting a good tune. The only sound advice I could offer is that you do your research before you let anyone touch your car. Thankfully a place like this forum should have myriad sources of info on where you can obtain a good tune in your area.
. I read that the stock turbo can take up to about 30 psi, give or take, but a tuner told me that 27psi and up I can't run on pump? Plus it would be helpful to get bigger injections I think if I went up that high lol, but I don't need it to be a fire breathing monster. Just something that is better than stock and a bit more fun,
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While there are ways on other cars to tune the ECU to sort of compensate for the atmospheric BOVs, its never perfect nor do I know if tuners have that ability for the Evo X. I can't stress enough that these BOVs are really more trouble than they are worth. You will have much better drivability recirculating that thing. You will still hear the noise plenty, don't worry.
Again, being new to the Evo, I'm not sure what the stock turbo is capable of. More than likely if it is capable of 30 psi, I'm sure thats well out of its efficiency range and at that point, its just a big, over revved heat pump. No point in doing that.
You should go to the "Regional" section of this website and post in your region and ask the locals where a good place to get tuned is. Then call that shop and pick their brains. Tell them what you have, what you want and most importantly, your budget. Don't keep them on the phone all day asking about stuff if you don't have the money and/or intention to do what you're inquiring about. Its rude and a waste of their valuable (expensive!) time.
I'm sure like me, you're enjoying your car. Continue to do so and try to do things the right way the first time. It will save you headache and money in the long run. Good luck.
Again, being new to the Evo, I'm not sure what the stock turbo is capable of. More than likely if it is capable of 30 psi, I'm sure thats well out of its efficiency range and at that point, its just a big, over revved heat pump. No point in doing that.
You should go to the "Regional" section of this website and post in your region and ask the locals where a good place to get tuned is. Then call that shop and pick their brains. Tell them what you have, what you want and most importantly, your budget. Don't keep them on the phone all day asking about stuff if you don't have the money and/or intention to do what you're inquiring about. Its rude and a waste of their valuable (expensive!) time.
I'm sure like me, you're enjoying your car. Continue to do so and try to do things the right way the first time. It will save you headache and money in the long run. Good luck.
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Newbie
Joined: Dec 2012
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From: USA
While there are ways on other cars to tune the ECU to sort of compensate for the atmospheric BOVs, its never perfect nor do I know if tuners have that ability for the Evo X. I can't stress enough that these BOVs are really more trouble than they are worth. You will have much better drivability recirculating that thing. You will still hear the noise plenty, don't worry.
Again, being new to the Evo, I'm not sure what the stock turbo is capable of. More than likely if it is capable of 30 psi, I'm sure thats well out of its efficiency range and at that point, its just a big, over revved heat pump. No point in doing that.
You should go to the "Regional" section of this website and post in your region and ask the locals where a good place to get tuned is. Then call that shop and pick their brains. Tell them what you have, what you want and most importantly, your budget. Don't keep them on the phone all day asking about stuff if you don't have the money and/or intention to do what you're inquiring about. Its rude and a waste of their valuable (expensive!) time.
I'm sure like me, you're enjoying your car. Continue to do so and try to do things the right way the first time. It will save you headache and money in the long run. Good luck.
Again, being new to the Evo, I'm not sure what the stock turbo is capable of. More than likely if it is capable of 30 psi, I'm sure thats well out of its efficiency range and at that point, its just a big, over revved heat pump. No point in doing that.
You should go to the "Regional" section of this website and post in your region and ask the locals where a good place to get tuned is. Then call that shop and pick their brains. Tell them what you have, what you want and most importantly, your budget. Don't keep them on the phone all day asking about stuff if you don't have the money and/or intention to do what you're inquiring about. Its rude and a waste of their valuable (expensive!) time.
I'm sure like me, you're enjoying your car. Continue to do so and try to do things the right way the first time. It will save you headache and money in the long run. Good luck.
. I'll also start saving up for a tune! Thanks again for your time, . Be safe!
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Evolving Member
Joined: Feb 2008
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From: Edmonton
Hey man, i run the exact same BOV on my lancer with it set to 50/50, and have been running it like this for 3 years - 60,000 kms. It runs flawlessly. The reason your hearing the "flutter" more distinctively now is more than likely because of the SRI you installed, it will amplify the sound of air being recirced. Mine will do the exact same thing as yours at low boost (1-5ish PSI) and it is not a problem, so long as it blows off/recircs under heavier boost/load. Hope this helps!
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Hey man, i run the exact same BOV on my lancer with it set to 50/50, and have been running it like this for 3 years - 60,000 kms. It runs flawlessly. The reason your hearing the "flutter" more distinctively now is more than likely because of the SRI you installed, it will amplify the sound of air being recirced. Mine will do the exact same thing as yours at low boost (1-5ish PSI) and it is not a problem, so long as it blows off/recircs under heavier boost/load. Hope this helps!
. Yeah I had mine fully atmospheric and then today I fitted it back to 50/50 and softened up the spring a little bit and I still get a bit or surge, but then it like converts to release of the BOV. Kind of like ch-ch pshhh if you know what I mean haha, , but only on low boost. I wondered if it was just making the sound more distinct, and now that someone thinks the same way, I feel better,
Evolving Member
Joined: Dec 2012
Posts: 227
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From: Dunn, NC
Your best bet is not to vent it to the atmosphere at all. Run it how the car was designed. Make sure your spring tension is set right as to not cause any flutter as compressor surge is very bad for your turbo.
As far as the tune goes...they usually range from $3-500. The tuner will up the boost and adjust your fuel tables to the limits that your vehicle can handle( without knock). The limit for the stock turbo is around 28 psi but even then your pushing it. Most tuners will set it around 25.
As far as the tune goes...they usually range from $3-500. The tuner will up the boost and adjust your fuel tables to the limits that your vehicle can handle( without knock). The limit for the stock turbo is around 28 psi but even then your pushing it. Most tuners will set it around 25.
Last edited by Sunwalker12; Feb 22, 2013 at 12:04 PM.
Thread Starter
Newbie
Joined: Dec 2012
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From: USA
Your best bet is not to vent it to the atmosphere at all. Run it how the car was designed. Make sure your spring tension is set right as to not cause any flutter as compressor surge is very bad for your turbo.
As far as the tune goes...they usually range from $3-500. The tuner will up the boost and adjust your fuel tables to the limits that your vehicle can handle( without knock). The limit for the stock turbo is around 28 psi but even then your pushing it. Most tuners will set it around 25.
As far as the tune goes...they usually range from $3-500. The tuner will up the boost and adjust your fuel tables to the limits that your vehicle can handle( without knock). The limit for the stock turbo is around 28 psi but even then your pushing it. Most tuners will set it around 25.
Evolving Member
Joined: Dec 2012
Posts: 227
Likes: 1
From: Dunn, NC
Nope...your factory inter cooler will be fine. Although it wouldn't hurt to give it an upgrade the factory set up is fine for the stock turbo. It all depends on what your shooting for and what your wallet can handle. If your looking to make decent power and have limited funds then just get a good tune, trust me man it will be a completely different car. If your wallet can take a beating then by all means, upgrade your piping...get a better inter cooler and throw on a good turbo back...followed by a good tune. If I was you I would just save up and get the tune, most kids your age don't have the funds to support a modding habit. Find a reputable shop and get a tune man.
Thread Starter
Newbie
Joined: Dec 2012
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From: USA
Nope...your factory inter cooler will be fine. Although it wouldn't hurt to give it an upgrade the factory set up is fine for the stock turbo. It all depends on what your shooting for and what your wallet can handle. If your looking to make decent power and have limited funds then just get a good tune, trust me man it will be a completely different car. If your wallet can take a beating then by all means, upgrade your piping...get a better inter cooler and throw on a good turbo back...followed by a good tune. If I was you I would just save up and get the tune, most kids your age don't have the funds to support a modding habit. Find a reputable shop and get a tune man.
Thread Starter
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Joined: Dec 2012
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From: USA
I know this is random, but I saw some graphs of a a few stock evo 10s with just a tune and gains are amazing! I know evos are tuned really rich, but I didn't expect it to be that much of an Improvement from just a tune!
Last edited by evoxbill; Feb 24, 2013 at 03:41 PM.