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Old 07-22-2009, 07:46 PM   #26
RallySport Direct
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Should be able to, but we never took one apart to that extent.
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Old 07-22-2009, 11:17 PM   #27
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This is kind of strange. seeing how i have a new beat rush can. and it actually uses the oil refill as a added crank case venting point.

at high rpm wouldnt pressure be coming out ward of the oil refill?

I was contemplating this kit before the beatrush btw.
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Old 07-23-2009, 12:26 PM   #28
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On a healthy motor, there should not be any high amounts of pressure.
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Old 07-23-2009, 09:22 PM   #29
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i never get oil coming from there
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Old 08-22-2009, 08:34 AM   #30
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Quote:
Originally Posted by RallySport Direct View Post
This only attaches to the head system, the Crank case system is left to work like stock.
That means you're still getting oil in the intake tract. The stock system pulls gasses from the crankcase through the PCV and into the intake manifold when a greater pressure exists in the crankcase, and shunts them into the turbo inlet under boost when the PCV closes. Prova is only addressing the head breathers, which is better than nothing I suppose, but still leaves one side of the system unaddressed.
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Old 08-24-2009, 12:51 PM   #31
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Quote:
Originally Posted by stidoc View Post
That means you're still getting oil in the intake tract. The stock system pulls gasses from the crankcase through the PCV and into the intake manifold when a greater pressure exists in the crankcase, and shunts them into the turbo inlet under boost when the PCV closes. Prova is only addressing the head breathers, which is better than nothing I suppose, but still leaves one side of the system unaddressed.
Yes you are correct, that oil from the the crank case will still get into the intake track.
However if you look at a turbo inlet, majority of the oil is coming from the heads and not from the crank case.
After install of these units, there is almost no noticeable oil in the intake or in the intercooler. Where with no catch can/ air oil separator you can tilt the intercooler and see oil come out. No such case after install of these units.
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Old 10-01-2009, 04:10 PM   #32
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Yeah these are pretty damn sick... it's using the vac pressure to draw the oil back into the system. The way its designed is it has little holes with a lip so you don't have oil blowing back up into the turbo inlet line.

Edit: Nice write up RSD
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Old 10-02-2009, 02:55 PM   #33
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Wow, great looking product and finally an excellent and easy setup!!!! Oh and Nice write up too
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Old 10-05-2009, 10:51 AM   #34
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These things are great, except for the fact that the hose that comes with the kit is really weak and flimsy (A small price to pay for such a great product). Plus if you try to bent the hose at all it will pinch off and won't recirculate air/oil (I know all hoses will do that, but this stuff did it a lot sooner than any other regular hose). I had mine in/on my car for about a year and both of the hoses already cracked and dry rotted. I had to replace the hose with a higher quality hose that wouldn't dry rot as quickly. That's the only down side to this product that I have seen - otherwise it worked great.
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Old 10-05-2009, 04:26 PM   #35
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this thing looks awesome and would love to get one but with my catch can and funds being low it will be some time before a prova aos goes on my sti
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Old 10-05-2009, 04:34 PM   #36
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Quote:
Originally Posted by RallySport Direct View Post
However if you look at a turbo inlet, majority of the oil is coming from the heads and not from the crank case.
Yeah right!
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Old 10-05-2009, 10:04 PM   #37
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Quote:
Originally Posted by axelthrasher View Post
These things are great, except for the fact that the hose that comes with the kit is really weak and flimsy (A small price to pay for such a great product). Plus if you try to bent the hose at all it will pinch off and won't recirculate air/oil (I know all hoses will do that, but this stuff did it a lot sooner than any other regular hose). I had mine in/on my car for about a year and both of the hoses already cracked and dry rotted. I had to replace the hose with a higher quality hose that wouldn't dry rot as quickly. That's the only down side to this product that I have seen - otherwise it worked great.
Can you comment on if it actually works? I.E. have you pulled the line - on both ends - that runs from the prova unit to the turbo inlet to see if there's any trace of oil or buildup after using it over time? It should be easy to tell. I'm looking for a somewhat unbiased opinion.

Sucks about the hose. They should include top-of-the-line oil safe hose considering the price for what's included.
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Old 10-05-2009, 11:09 PM   #38
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Quote:
Originally Posted by Deuce Cam View Post
Can you comment on if it actually works? I.E. have you pulled the line - on both ends - that runs from the prova unit to the turbo inlet to see if there's any trace of oil or buildup after using it over time? It should be easy to tell. I'm looking for a somewhat unbiased opinion.

Sucks about the hose. They should include top-of-the-line oil safe hose considering the price for what's included.
The ends of the hoses were not in fact covered in oil. As a matter of fact - they pretty much only smelled like oil. By no means is my motor stock though, so perhaps someone who has/had blow by issues would have a different story. I DID have breathers on the crank case and both cylinder heads at one point and the motor did spew a decent amount of oil out of the breathers (mainly the crankcase breather). I did away with that setup a long time ago and the car ran much better because the metered air was once again circulated into the system.

That brings me to this - I haven't seen any oil buildup yet, but I sure as hell know that the air is being recirculated. The final thing that I NEED to add to this is that the Prova setup of mine only saw about 100-300 miles of regular driving time, not consistent high RPMs or anything.
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Old 10-09-2009, 12:53 PM   #39
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Thanks for the great write up Kirill.
Install takes less than 5 minutes, seriously.
And the piece is beautifully crafted.
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Old 10-09-2009, 06:18 PM   #40
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Quote:
Originally Posted by STi-MAN View Post
This is kind of strange. seeing how i have a new beat rush can. and it actually uses the oil refill as a added crank case venting point.

at high rpm wouldnt pressure be coming out ward of the oil refill?

I was contemplating this kit before the beatrush btw.
I must have missed this post before.

You will feel pulses of air coming from the oil fill cap at idle if removed fwiw. So yes, pressure would come out of the oil refill under heavy load. This shouldn't be a problem if the a/o unit works (i.e. it seperates the air from the oil).
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Old 11-30-2009, 06:20 PM   #41
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A side note for GDA/GDB users, the unit that attaches to the filler neck will need to face the opposite direction from the 08 and above, due to the angle of the filler neck, pic inserted, excuse the crappy quality

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Old 12-03-2009, 02:00 PM   #42
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not really....

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Old 01-11-2010, 02:06 AM   #43
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any chance of a group by?
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Old 01-15-2010, 10:42 PM   #44
saico99
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rly nice writeup, extremly well detailed DIY
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Old 01-20-2010, 12:59 PM   #45
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Got mine last night and installed it in the rain. It's a awesome piece, I was running a dual catch can. One for the crank case, one for the head breathers. I got rid of both the cans, ran a hose to the head breathers, T'd the middle by the crankcase and hooked the crankcase hose to the T. Then put another T in the head breather hose and ran it to the prova unit. Then ran the hose to the intake. I used good fuel line that will last, the stuff prova gives you already feels hard when you get it. It took me about a hour and a half to do this, had to remove the intercooler etc. But it is possible to make it crankcase breather too not just a head breather, you just have to step away from your stock setup.

Last edited by bwrx03; 01-20-2010 at 01:23 PM.
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Old 01-22-2010, 07:43 PM   #46
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Quote:
Originally Posted by bwrx03 View Post
Got mine last night and installed it in the rain. It's a awesome piece, I was running a dual catch can. One for the crank case, one for the head breathers. I got rid of both the cans, ran a hose to the head breathers, T'd the middle by the crankcase and hooked the crankcase hose to the T. Then put another T in the head breather hose and ran it to the prova unit. Then ran the hose to the intake. I used good fuel line that will last, the stuff prova gives you already feels hard when you get it. It took me about a hour and a half to do this, had to remove the intercooler etc. But it is possible to make it crankcase breather too not just a head breather, you just have to step away from your stock setup.
hows that working out for you? after seeing the grimmspeed unit, I was thinking of doing the same mod that you did to vent both. also, what did you use to block off the opening in the turbo inlet?
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Old 01-22-2010, 11:57 PM   #47
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Quote:
Originally Posted by englishguy3012 View Post
hows that working out for you? after seeing the grimmspeed unit, I was thinking of doing the same mod that you did to vent both. also, what did you use to block off the opening in the turbo inlet?
It works perfectly, I still have all the hoses going to the turbo inlet. I made the pcv valve route to the one rear inlet. So theoretically it only sucking in clean air, no blowby or oil. What i saw from the grimmspeed unit, is that the crankcase vent and the pcv valve are still connected then it goes into the A/O separator. My question is what happens when the pcv valve is open and oil and blowby is still coming out of the crankcase? To me it kinda defeats the purpose.

edit- i can snap some pics if you'd like

Last edited by bwrx03; 01-23-2010 at 12:09 AM.
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Old 01-23-2010, 12:19 AM   #48
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Yea that would be great if u can post pics, I got the gist of what ur saying, but pics would aid me in doing the mod
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Old 01-23-2010, 12:34 AM   #49
bwrx03
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Quote:
Originally Posted by englishguy3012 View Post
Yea that would be great if u can post pics, I got the gist of what ur saying, but pics would aid me in doing the mod
I'll be doing a grounding kit tomorrow so i'll grab some pics, i'll do the best i can without taking off the intercooler.

Heres a crude diagram of what i did.
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Old 02-20-2010, 02:09 PM   #50
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Hi I bought the prova AOS from rallysport direct , Item is well built and a top class customer service from rallysport!

The downside that I am facing now after installing it (around 2 days from the installation), I find the car sluggish and rough . By the way I am running on APS cold air intake , and APS turbo Induction Hose . Does it effect the MAF ? Im using autronic SM4 .

Does installing this require me to tune back my ecu or this might happen due to oil leak?

Thanks in advanced for those whom can point me to the right direction , Here are the picture after installation :

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