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-   -   Safe boost level for stock turbo with PW TMIC (http://legacygt.com/forums/showthread.php?t=190478)

DerekDaniel 07-31-2012 02:43 PM

Safe boost level for stock turbo with PW TMIC
 
Hello what is the safest amount of boost one can run on stock gen4 legacy with TMIC upgrade? (and stock downpipe) without killing the turbo.....

Or, can you run higher levels with TMIC upgrade as long as banjo bolts stay clean? and do the 08 GTs have the problem with banjo bolts getting clogged and killen turbos?

Has anybody ran too much boost with TMIC upgrade where their stock turbo was blown.
If so what psi?

Thank you for advice and clarification: I ask because I had 17 psi on stock tmic and it blew off my bpv hose that connects up under the manifold (which is a pain in the ass to put back on, because you have to remove entire tmic and putting a clamp on it is a whole other story).

So I ordered a process west tmic, so I can at least keep running 17 psi and hopefully avoid popping hoses. I would also like to increase the boost with this upgrade, maybe to 17.5 or 18psi. , but I don't want to run to much boost and keep popping lines or even worse kill the turbo.

Thanks for advise.

SCASEYS 07-31-2012 02:49 PM

so you bought a $950+ TMIC and only want 18PSI

have any money to give me?

shadowsports 07-31-2012 02:59 PM

No banjo on '08's. Someone else will have to answer your other questions in regards to max safe psi on a stock turbo.

m sprank 07-31-2012 03:04 PM

08's have a banjo bolt filter screen. All turbo Subies do. Some have more than others. It is a myth that 008+ do not have them.

During the 2008 Stop Sale some overzealous Subie techs removed them pre-purchase. this was not advised by SOA. They were there when the cars left the factory.

Boost level is somewhat determined by knock/timing/fuel/etc. If using a stock turbo, a PW is major overkill. But, if it makes you feel better, its your money. You will most likely be able to (safely) tune to 18.5-19psi on stock fuel, stock turbo, PW. Might be able to eek 20psi for a quick second.

scoobydoobie 07-31-2012 03:12 PM

Quote:

Originally Posted by SCASEYS (Post 4006202)
so you bought a $950+ TMIC and only want 18PSI

have any money to give me?

If on a stock turbo all you really want to run is 18-19 anyways

DerekDaniel 07-31-2012 04:00 PM

Cool thank for the replies.
I went PW because of global warming and cant afford to get down pipe and bigger turbo for mawr power.

So I am just trying to get a max stage one tune goin, so far perrin turbo inlet and a 2.5 inch magnaflow cat back and grimmspeed 3port lol.

I have received my first map from infamous and loved how the car felt and how the logs looked compared to the problems with cobb maps, and a recent protune gone bad.

But 17 psi blew my damn bpv line off that attaches under the manifold and I think 17 psi boost I think it may also be too much for the stocker tmic over time. Not to mention stock tmic is a horrible set up.
So I figured I would upgrade since I had everything torn apart and would also be able to keep hiting 17 psi with upgrade, instead of possibly having to go down to 16psi with the stocker to avoid blowing end tanks and popping lines. I dont wanna go down in psi I want to go up and my stock intercooler wont allow that
Plus Pwest is only like $180 bucks more than perrin and avo

.:Catalyst:. 07-31-2012 04:10 PM

I'm totally confused by your logic. You are stage 1 - had a few lines pop off at around 17psi so rather than using clamps or such you bought a $1000 TMIC, a turbo inlet, EBCS, and CBE?

I highly recommend you do some more research or ask questions before buying anything. For what you spent on the PW alone you could have done a DP, tune, and found a used Perrin or AVO TMIC.

Blowing vac lines isn't fixed with another TMIC. Seems from your first post here that you aren't focusing on a new turbo, but your building your car as if it's going stage 3 within the week.

DerekDaniel 07-31-2012 04:38 PM

Quote:

Originally Posted by .:Catalyst:. (Post 4006321)
I'm totally confused by your logic. You are stage 1 - had a few lines pop off at around 17psi so rather than using clamps or such you bought a $1000 TMIC, a turbo inlet, EBCS, and CBE?

Yeah they are clamped now but even clamped I doubt stock tmic could handle 17 psi boost for any reasonable time, and I do not want to have to decrease boost to avoid the possibility of popping this pain in the ass line off again regardless if its is clamped, super-glued and ziptied or eventually blowing the end tanks ad I do not want to puts some crazyass clamps and jb quikweld as a solution.

I highly recommend you do some more research or ask questions before buying anything. For what you spent on the PW alone you could have done a DP, tune, and found a used Perrin or AVO TMIC.

I could not buy all of those parts you indicated for less than a PW tmic, as I do not put cheap stuff on my car. The Avo and perrin tmic are just bigger stock setups still sitting on the tutbo like a turd soaking up heat, unlike the PW set up. Also why does it matter that I upgrade my Tmic before my downpipe? I did not know there was a specific order to modifying a car.

Blowing vac lines isn't fixed with another TMIC. Seems from your first post here that you aren't focusing on a new turbo, but your building your car as if it's going stage 3 within the week.

So I should have just went down to 16 psi boost to quit blowing lines and called it a day? When did keeping air cooler become such a bad thing, regardless if the car is stock or if it has a bigger turbo or down pipe on it?
It is a hundred and hell degrees where I live and I believe this is the best decision to do what I want without spending a ton of money. and still get decent gains from a tune.

DerekDaniel 07-31-2012 04:48 PM

Quote:

Originally Posted by m sprank (Post 4006235)
08's have a banjo bolt filter screen. All turbo Subies do. Some have more than others. It is a myth that 008+ do not have them.

During the 2008 Stop Sale some overzealous Subie techs removed them pre-purchase. this was not advised by SOA. They were there when the cars left the factory.

Boost level is somewhat determined by knock/timing/fuel/etc. If using a stock turbo, a PW is major overkill. But, if it makes you feel better, its your money. You will most likely be able to (safely) tune to 18.5-19psi on stock fuel, stock turbo, PW. Might be able to eek 20psi for a quick second.

I gotta also try and locate the banjo bolts I got the repair manual so i can look it up. can they be cleaned or do they need replaced? if so do you have a part# for 08 leg GT 5eat Thanks msprank

DerekDaniel 07-31-2012 04:49 PM

Quote:

Originally Posted by scoobydoobie (Post 4006252)
If on a stock turbo all you really want to run is 18-19 anyways

Cool thanks dude I think I may ask my tuner to go 17.5 or 18psi to stay on the moderate side, and call it good.

.:Catalyst:. 07-31-2012 05:22 PM

Not saying the PW isn't a gorgeous unit or that lowering air temps is bad! I plan on having one someday myself.

Just saying that even with the PW - at 17+ psi you will blow some vac lines off. I used nylon dual locking zip ties torqued tight on all vac lines when I went stage 2 (currently 17.5psi). That or some small hose clamps rather than the weak little spring clamps will do wonders.

Also when you made the comment you didn't have money for a DP and bigger turbo I was sharing what the consensus typically is - bulletproof your OEM TMIC, get a used AVO or Perrin for $400, and invest in the DP and tune first. The DP upgrade with a tune is a great mod dollar for dollar power wise. Going with a badass TMIC is a supporting mod - typically for much larger turbos not stage 1 power levels.

.:Catalyst:. 07-31-2012 05:27 PM

Quote:

Originally Posted by DerekDaniel (Post 4006380)
I could not buy all of those parts you indicated for less than a PW tmic, as I do not put cheap stuff on my car. The Avo and perrin tmic are just bigger stock setups still sitting on the tutbo like a turd soaking up heat, unlike the PW set up. Also why does it matter that I upgrade my Tmic before my downpipe? I did not know there was a specific order to modifying a car.

There is logic to power related upgrades. Do what you want - I'm done trying to help. Spend your money as you please and do the same with your car. :spin:

DerekDaniel 07-31-2012 05:56 PM

I understand it does sound funky the route I am taking, and the possibility of still popping lines.

But I just figured if I got a down pipe it would add to heat and I would still be limited to the boost I could run with the stock tmic. Probably maxing out out at 17 psi on the safe side.

So I just went with the tmic, so I could still get decent boost and not have to worry about tmic going out because of higher boost levels and combat heat at same time. precautionary method I guess.

I hope blowing lines off is no longer and issue as I worm clamped and ziptied the hose under the manifold that goes bpv and hit up just about every other line with a clamp or zip tie.

Is there special zip ties by chance designed specifically for boost/vac or any other hose for that matter?
I am using some 8 inch electrical cable double lock zip ties but I do not know how they will hold up under heat in the long run.

DerekDaniel 07-31-2012 06:00 PM

Quote:

Originally Posted by .:Catalyst:. (Post 4006452)
There is logic to power related upgrades. Do what you want - I'm done trying to help. Spend your money as you please and do the same with your car. :spin:

Soon I will have a down pipe to go with the PW, just not yet this area was having issues, so I could justify the purchase with the wifey easier than a DP mod lol

famaya26 07-31-2012 06:04 PM

Quote:

Originally Posted by .:Catalyst:. (Post 4006321)
I'm totally confused by your logic. You are stage 1 - had a few lines pop off at around 17psi so rather than using clamps or such you bought a $1000 TMIC, a turbo inlet, EBCS, and CBE?

I highly recommend you do some more research or ask questions before buying anything. For what you spent on the PW alone you could have done a DP, tune, and found a used Perrin or AVO TMIC.

Blowing vac lines isn't fixed with another TMIC. Seems from your first post here that you aren't focusing on a new turbo, but your building your car as if it's going stage 3 within the week.

That or he could have BulletProofed his OEM TMIC by buying the kit from BarManBean and saved around $300. But thats just advice, its OP's money and he can do what ever he wants with it.


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