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Old 12-10-2011, 10:56 AM   #1
ftarhooks
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Post turbo surge after new turbo inlet hose was installed

Hi I replaced my stock turbo inlet on my 02 bug eye with an after market one now I'm experiencing turbo surge turned down the boost and still getting it plz help Ide greatly appreciate it
02 wrx
Greddy : front mount intercooler, bov ,manual boost controller,turbo back exhaust ,
Aftermarket turbo inlet hose , uppipe (no cats)
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Old 12-10-2011, 01:07 PM   #2
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1. I'm sorry, you "turned down the boost?" How?
If you did what I think you did, and adjusted your boost controller without any other sort of compensation from your ECU, then I think you need to stop right now before you blow your ****ing car up.

2. Please type in coherent English.
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Old 12-10-2011, 02:47 PM   #3
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Quote:
Originally Posted by XanRules View Post
1. I'm sorry, you "turned down the boost?" How?
If you did what I think you did, and adjusted your boost controller without any other sort of compensation from your ECU, then I think you need to stop right now before you blow your ****ing car up.

2. Please type in coherent English.

quote worthy
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Old 12-11-2011, 12:02 AM   #4
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Yeah, if you are turning up and or down your boost, you better have a way to control your fuel as well, or you'll be driving yourself to disaster. The inlet pipe is going to flow more air anyway, and that in itself wouldn't HAVE to be tuned for on an ;02, but with your other mods, if you haven't had the car tuned, I would say you could be running dangerously lean. Do you have a wideband? Any way to datalog? How much boost were you running before the install, and what did it go to after? It may not be the end of the road, but I wouldn't push it hard until you know more about what's going on inside the motor.

p.s. Your BOV isn't exactly helping matters, since your stock EM has no idea what to do with it.
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Old 12-11-2011, 01:04 AM   #5
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The inlet shouldn't affect the way it runs. The MAF pipe is still the same size.
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Old 12-11-2011, 01:07 AM   #6
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Then why would someone do it at all?
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Old 12-11-2011, 01:33 AM   #7
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Quote:
Originally Posted by mrjcotten View Post
The inlet shouldn't affect the way it runs. The MAF pipe is still the same size.
Generally people upgrade their inlet hose for the increased/smoothed air flow to the turbo. If you look at, for example, the Perrin turbo inlet hose it is a decent amount larger then the stock inlet hose, thus increasing air flow. This could most definitely affect the way the vehicle runs.
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Old 12-11-2011, 01:45 PM   #8
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Yeah it is less restrictive, but it should not change the a/f ratios because it is not Altering any parameter that affects the tune. To get the most benefit from it, tuning is needed.
Yes it is less restrictive, so it will help air flow to the turbo.
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Old 12-11-2011, 05:32 PM   #9
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Ok well the car does have some of a tune don't know what tune or whartit has done to the ecu the car was boosting 20 lbs noww its at 15 lbs I bought the car like that with all the mods about 2 years ago it has 82k miles on it boosting that much its ran like that for 2 years allready up untill this winter when I replaced the turbo inlet cause the oem was torn I have turned down the boost when I go out of town and experience nothing like this like I said I bought the car like this and its hella fast . I bought it boosting 20lbs
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Old 12-11-2011, 10:05 PM   #10
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Well, when you say turbo surge, what do you mean exactly? was your boost spiking up and down erratically? Was the turbo making funny noises? Both? Was the engine making an funny noises?
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Old 12-11-2011, 10:13 PM   #11
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check your bov make sure its all intact, when i had installed my 2.4 gimmick inlet hose in my 03 wrx, i took it for a test drive and while driving got a huge turbo surge because i forgot to secure a hose clamp on my bov. so mayb its that mayb its not
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Old 12-11-2011, 10:45 PM   #12
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Simplest thing.......recheck your work.
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Old 12-12-2011, 10:52 AM   #13
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Yea I've triple checked all the hoses everything what I mean by turbo surge is it has the fluttering sound kinda sounds like a turkey blow off it sounds as if its coming from my intake cone others suggested that I adjust the bov
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Old 12-12-2011, 11:41 AM   #14
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omguhavecompressersurge!!!!!!!! adjust your bov. they require proper maintenance and adjustment. carry on.
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Old 12-12-2011, 11:43 AM   #15
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Fluttering when you lift the throttle is compressor surge. The bov is 100% to blame for this. Go back to stock and your problem is gone. Easy as that.
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Old 12-12-2011, 11:45 AM   #16
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Put the hose back onto your BOV.

Go back over everything that you touched while replacing the inlet.

Quote:
Originally Posted by evan_impreza
Fluttering when you lift the throttle is compressor surge. The bov is 100% to blame for this. Go back to stock and your problem is gone. Easy as that.
Not if he's tuned for the front mount/bov.

It's also possible that this has been happening since day one and you're just hearing it now due to the inlet.
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Old 12-12-2011, 12:11 PM   #17
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Lol you can't tune the ECU to get rid of compressor surge if the bov spring is too tight. Cannot.
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Old 12-12-2011, 12:12 PM   #18
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You could "tune" the bov by loosening the spring a bit, but then it may leak at idle. That's about all he can do.
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Old 12-12-2011, 12:15 PM   #19
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Quote:
Originally Posted by evan_impreza
Lol you can't tune the ECU to get rid of compressor surge if the bov spring is too tight. Cannot.
Didn't say you could.

But you CAN tune a car in speed density to account for a BOV as opposed to a BPV.

Judging by the op's post, anything can be possible and shouldn't be swapping parts around all Willy-billy until you know exactly what's on the car and has been tuned for.
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Old 12-12-2011, 12:18 PM   #20
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Speed density won't help the compressor surge at all. It will stop the rich swing in AFRs but not the surge.
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Old 12-12-2011, 12:20 PM   #21
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What I'm going to do is adjust the boost back to 20lbs how its been at and adjust the bov. Now the question is how do I adjust the bov its a Greddy bov
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Old 12-12-2011, 12:25 PM   #22
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Quote:
Originally Posted by evan_impreza
Speed density won't help the compressor surge at all. It will stop the rich swing in AFRs but not the surge.
Exactly.

And if it's tuned in speed density to account for an atmospheric bov and you replace it with a BPV?

Potential leanbeen happening since day one but the inlet is allowing it to be heard.

Step 1 is rechecking your work.
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Old 12-12-2011, 12:27 PM   #23
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There is a nut on the top of the valve with "soft" and "hard" labeled for which way you should turn it. Make it softer, or CCW. And easy with that MBC. Just cranking on a MBC is NOT the proper way to raise the boost on these cars.
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Old 12-12-2011, 12:31 PM   #24
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Quote:
Originally Posted by Psychoreo View Post
Exactly.

And if it's tuned in speed density to account for an atmospheric bov and you replace it with a BPV?

Potential leanbeen happening since day one but the inlet is allowing it to be heard.

Step 1 is rechecking your work.
What?
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Old 12-12-2011, 12:45 PM   #25
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Quote:
Originally Posted by evan_impreza

What?
Install bov.

Gain rich condition during shifts.

Get tuned speed density.

No more rich condition during shifts.

Install bpv while maintaining same tune.

Air gets dumped back into inlet instead of the engine bay.

Potential lean condition.

(unless my vague understanding of speed density is wrong, which is completely possible.)

Regardless, if the condition began after installing the inlet, the inlet is the first place to start.

"hey my car started getting a vibration after I installed new wheels/tires"

Which is the proper step one?

A: check your tie rod ends
B: verify that the new wheels/tires are balanced/straight/not bent.
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