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Old 05-18-2007, 02:44 AM   #1
Dyno Flash
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Default Perrin Intake tube colapse - AEM air filter test - etc - video

Today we had a 06 STI with a dominator stock location turbo

The turbo was sucking so hard it literally colapsed the Perrin silicone turbo inlet hose at around 6,000 rpms killing the power each time

We tried to alievaiate the problem with removing the AEM dry filter we was using and I was shocked how much power that freed up !

Here is a video

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Old 05-18-2007, 03:06 AM   #2
sleepy98
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i guess it's cool to video. but please....
welcome to last year duh.
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Old 05-18-2007, 04:46 AM   #3
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Man i thought is was going to show it collapsing.
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Old 05-18-2007, 04:59 AM   #4
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and what was the exact diffrence in power?!?
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Old 05-18-2007, 06:08 AM   #5
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So is the conclusion:

1. AEM filter is garbage and too restictive
2. AEM filter is garbage along with the perrin inlet
3. AEM filter is good, Perrin inlet is garbage
4. AEM filter is good, Perrin inlet is good
5. Perrin inlet is good
6. Perrin inlet is garbage
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Old 05-18-2007, 07:05 AM   #6
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Quote:
Originally Posted by modaddict View Post
So is the conclusion:

1. AEM filter is garbage and too restictive
2. AEM filter is garbage along with the perrin inlet
3. AEM filter is good, Perrin inlet is garbage
4. AEM filter is good, Perrin inlet is good
5. Perrin inlet is good
6. Perrin inlet is garbage

haha no actually the conclusion is air flows better w/o restriction oh wait thats common knowledge
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Old 05-18-2007, 07:19 AM   #7
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^^^damn.....

7. air flows better w/0 restiction?






lol...
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Old 05-18-2007, 07:29 AM   #8
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that's always nice when you've spent all your money on a set-up and then drove 100 or so miles only to have this happen.
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Old 05-18-2007, 07:34 AM   #9
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The perrin turbo inlet looks like it's pinched at the bend. Mine is the same way when installed. I wonder if mine will collapse when I install my 20G with my APS CAI. I'm currently running a AMSOIL filter which looks more restrictive than the APS cone.
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Old 05-18-2007, 11:44 AM   #10
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I've got the same two pieces on my car (aem intake and perrin inlet). I run a vf30 and have no problems. Maybe the bigger turbos require a samco or aps inlet.
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Old 05-18-2007, 12:03 PM   #11
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Need a better breathing filter.
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Old 05-18-2007, 12:07 PM   #12
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It got replaced last night when he got the car back to the shop with an aps hard pipe and a set of tgv deletes.
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Old 05-18-2007, 12:07 PM   #13
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Quote:
Originally Posted by CoolRex View Post
Need a better breathing filter.
Quoted for truth.

Fix the problem (filter), not the symptom (inlet).
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Old 05-18-2007, 12:19 PM   #14
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^^ What he said. The inlet collapses due to a vacuum caused when the filter can't flow enough air to supply the turbo, not because you're pushing too much boost. Vacuums require a pressure differential, not a single pressure value.
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Old 05-18-2007, 01:09 PM   #15
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Yep. Many people like to trash the Perrin inlets but in reality most all of them are using crappy filters. I've used Green filters and they work fine.

I've searched but didn't find anything useful but is there any info out there is analysis for the best flowing filters that also are good at 'filtering'?
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Old 05-18-2007, 02:02 PM   #16
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Yeah, best flowing, and good filtering is basically a compromise. My friends think I'm nuts because I use an un oiled K&N, but it suites my wants, keeps the big stuff out and flows great. If its gonna be a while before I track the car, it gets a liberal coat of filter oil. This post is good for me, I was considering the AEM dry filter, hoping for the best flowing good filtering comprimise, but knowing this, it obviously a great filter, but definate restriction. I guess my "DRY FLOW K&N" is superior
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Old 05-18-2007, 02:08 PM   #17
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Quote:
Originally Posted by Mechie3 View Post
^^ What he said. The inlet collapses due to a vacuum caused when the filter can't flow enough air to supply the turbo, not because you're pushing too much boost. Vacuums require a pressure differential, not a single pressure value.
^^^what they all said

get an intake that breaths better and you wont collapse and you will gain that power that you found from taking the intake off
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Old 05-18-2007, 02:39 PM   #18
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Take it easy guys

I am only posting this info so that others setting up stock location upgraded turbos will hopefully read this and be aware of the condition and avoid frustration

Obviously, if cars are comming to get tuned in this condition - the word needs to get out there more

Thanks
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Old 05-18-2007, 02:46 PM   #19
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Quote:
Originally Posted by Dyno Flash View Post
Take it easy guys

I am only posting this info so that others setting up stock location upgraded turbos will hopefully read this and be aware of the condition and avoid frustration

Obviously, if cars are comming to get tuned in this condition - the word needs to get out there more

Thanks
It is just unfortunate that your post/video carries a bit of "anti-Perrin" bias, when the Perrin inlet didn't cause the problem... it actually made you aware of the *real* problem, which is/was the restrictive filter.
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Old 05-18-2007, 02:46 PM   #20
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^ title of page says 20g. Video mentions the turbo was a dominator.
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Old 05-18-2007, 02:58 PM   #21
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Ok, so the Perrin collapses yet the blame is still going to the filter. If you can fix it with a better filter then fine, but it's a bandaid considering the fact that its the Perrin that is collapsing. I'm not saying it's not a quality piece but under given circumstances it doesn't hold up.

I delt with this issue on two accounts. I had a silicon elbow (not Perrin I might add) between the stock box and the Perrin inlet, and of course the inlet itself. Getting rid of the elbow smoothed out a LOT of problems, but I still will have problems if I step into boost early as opposed to smoothly accelerating into it (no it's not the tune). I have a 20G I might add. I am using an un-oiled filter atm...guess I'll either get the APS or take a chance and short term fix it with a different filter.
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Old 05-18-2007, 03:00 PM   #22
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Quote:
Originally Posted by TyranosaurusWRX View Post
Ok, so the Perrin collapses yet the blame is still going to the filter. If you can fix it with a better filter then fine, but it's a bandaid considering the fact that its the Perrin that is collapsing. I'm not saying it's not a quality piece but under given circumstances it doesn't hold up.
If a nail causes your tire to lose air, do you blame the tire or the nail?

You could use an APS inlet with a restrictive filter, and never be aware that your car was down on power... with a proper intake setup, there is no reason for the inlet to collapse.


I personally ran an *early* Perrin inlet (before they were made thicker) on my old '03 WRX. It went 12.6 on pump gas at full weight. That same inlet was used on my STi, which went 11.9 on pump gas and at full weight. That *same* inlet is now being used on a friend's car, with a JDM 2.0L and my old FP Green. No collapsing issues, ever.
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Old 05-18-2007, 03:04 PM   #23
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I see your point but the filter is not damaging the inlet. Maybe it will be a good measure of what filters work and what don't...but doesn't change the structural integrity of the inlet.

I've had my inlet for 3 yrs, don't know if it was before or after they changed it.. I ran [email protected] and trapped another time at 114.....and to get to the point I AM having issues. I've got a ****ty old mesh filter (if you really want to call it a filter). I'll try it out to verify.

Like I said, there's no issue as long as I don't shift early to build boost (which I would only do during tuning anyways)

Last edited by TyranosaurusWRX; 05-18-2007 at 03:12 PM.
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Old 05-18-2007, 03:22 PM   #24
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You still don't get it. The filter is causing a vacuum effect because it cannot allow enough air through it. That turbo isn't gonna slow down so what is left to give? The inlet will. Now I have personally seen the APS inlet with a crappy filter and the filter itself got sunk in. Again it's not the inlet's fault but the filter.

Also the times that you guys run has nothing to do with this issue.
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Old 05-18-2007, 03:27 PM   #25
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That was my point really.

I do get it..I just don't *entirely* agree that's all. Filter for the fix.
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