40psi with stock turbo!

[TSPowell]

Just wondering if anyone else is seeing this number with a stock turbo. Ive been running the TST for about 6 months now, and occasionaly put it on 3/3. It easily hits 40 psi. I already know Im asking to wreck my transmission, turbo and head gasket, I dont need told this. Just wondering if anyone else is doing the same thing? Not sure what the gasket is rated for, but I know others are doing 50-60psi with stock gasket. Im already shoping for a trubo and studs.



Which brings another question to mind. Has anyone removed the head bolts and dropped studs in with out pulling the head and changing the gasket?

 

[Luken]

You wont blow the gasket running 40psi. I blew my gasket running 55psi... I wouldn't want to push a stock turbo to 40psi but that's just me...



I know alot of guys who have dropped in ARP's without pulling the head. Just do one at a time.



Of course you can't bottom tap if you don't pull the head. It saves alot of work and time tho!



Lucas

 

[JFaulkner]

My 05 (which have electronic wastegates) would easially get 55psi with the stock charger with the TST. Doing that for any extended period of time and I'm sure it would have ate it's self. You really need to keep that from going any higher than 40 or you'll kill the little guy. :-laf

Of course you can't bottom tap if you don't pull the head.

you can if you have the right tap. Not available at your local hardware though.

 

[TCluff]

Just wondering if anyone else is seeing this number with a stock turbo. Ive been running the TST for about 6 months now, and occasionaly put it on 3/3. It easily hits 40 psi. I already know Im asking to wreck my transmission, turbo and head gasket, I dont need told this. Just wondering if anyone else is doing the same thing? Not sure what the gasket is rated for, but I know others are doing 50-60psi with stock gasket. Im already shoping for a trubo and studs.



Which brings another question to mind. Has anyone removed the head bolts and dropped studs in with out pulling the head and changing the gasket?

i tweaked my stock turbo and it blew up at 48psi, then i tweaked another and ran 43 psi for 6 months then decided on twins, twins rock... .

 

[GaryCarter]

Mine runs to 39 stock. Must be some room for increasing pressure before it destructs.

This is the 600/610. Don't know what differences exist for the 2004. 5 other than the wastegate.



Gary

 

[JVolpe]

I would get 41psi with juice/attitude, 44psi with Quad Race box on stock turbo. I ran for 6-8 months with one or the other and did not have any problems. I don't really recommend it, I just know I did it.



I have ARP studs installed without pulling the head. And before the studs I saw 55psi many times at the track on stock head bolts and gasket.

 

[tsi_2baad4u]

The wastegate is the same from 04. 5 up to 06. They are electronically controlled. If you run something with boost fooling you'll run well over 50psi because the computer will never see an overboost signal so it leaves it shut all the time. You have to run a different boost signal to the WG instead of from the stock solenoid on the compressor housing.



With a proper manual boost controller you can set boost whereever you want to. I run my stock turbo at 40psi on the street and 43-45psi on the dyno. I would not recommend 40psi for extended periods since it is playing with danger but I've run 40psi in short bursts for a year without any play in the turbine shaft.

 

[Jim Fulmer]

You guys running a stock turbo to that boost level is one thing, but I can only imagine were your drive pressures are at.



Jim

 

[tsi_2baad4u]

Yes, drive pressure is what will blow the head gasket since it's much higher than boost pressure. I've never measured it (I'm sure I don't want to know) but at 40psi it wouldn't be unheard of to see a 1. 5:1 or 1. 8:1 ratio which would be 60psi and beyond. Like I was eluding to though, I don't drag race or sled pull mine and I'm only on it for a freeway onramp or quick run. It certainly isn't recommended but does seem doable. The stock 600/610 turbo does seem to handle quite a bit of abuse. Just don't be surprised if it does pop.

 

[Diesel Power]

Yes, drive pressure is what will blow the head gasket since it's much higher than boost pressure. I've never measured it (I'm sure I don't want to know) but at 40psi it wouldn't be unheard of to see a 1. 5:1 or 1. 8:1 ratio which would be 60psi and beyond. Like I was eluding to though, I don't drag race or sled pull mine and I'm only on it for a freeway onramp or quick run. It certainly isn't recommended but does seem doable. The stock 600/610 turbo does seem to handle quite a bit of abuse. Just don't be surprised if it does pop.

after a certain rpm your not pushing the turbo with boosted air but rather rpm developed velocity. over speeding a stock turbo wont give you the drive pressure that a better turbo will, because to get harder drive pressure you first need more volume of air and a stock turbo is very limited, but a bigger turbo that is over speed will make great amounts of drive pressure. more air= more combustion pressure

 

[lmills]

stock chargers have a 62 mm compressor wheel which is comparable to most of the smaller chargers on the market. Add that to a very tiny exhaust housing and yes you will have very high drive pressures on a stock charger. Ideally you want to keep the drive pressure at or around 1:1.



Also drive pressure is the pressure in the exhaust manifold. It is a measurement of restriction.

 

[BSwope]

So what would be a good number to keep a stocker at... . if one has the option of limiting the boost?

 

[05mxdiesel]

The highest I have ever seen has been 34psi and that is with a manual boost guage. I did the tst mod that they reccommend to the electronic wastegate turbos to keep it opening like normal.

 

[staarma]

stock chargers have a 62 mm compressor wheel which is comparable to most of the smaller chargers on the market. Add that to a very tiny exhaust housing and yes you will have very high drive pressures on a stock charger. Ideally you want to keep the drive pressure at or around 1:1.



Also drive pressure is the pressure in the exhaust manifold. It is a measurement of restriction.

This is in line with everything I've read and heard. It makes sense too.

 

[Diesel Power]

around 40 is the highest you should go safely

 

[CRiggan]

I wonder what the drive pressure is on my silver bullet when I am seeing 60psi. I do have ARP head studs. Just hope I don't blow the head gasket.

 

[Diesel Power]

I wonder what the drive pressure is on my silver bullet when I am seeing 60psi. I do have ARP head studs. Just hope I don't blow the head gasket.

1. 1 ratio is achieved at 49-50 psi on the silver bullet.

 

[Mobius1]

I only run my tst on 3/3 and my stock turbo easily goes up to 40psi without even trying . I have the tst limit the boost pressure right at 40. I know there is so much more power in there but I don't want to blow the turbo. :{ I gotta get something like the Silver Bullet and a beefed up transmission :-laf

 

[Diesel Power]

I only run my tst on 3/3 and my stock turbo easily goes up to 40psi without even trying . I have the tst limit the boost pressure right at 40. I know there is so much more power in there but I don't want to blow the turbo. :{ I gotta get something like the Silver Bullet and a beefed up transmission :-laf

yep that will help a lot... ... ... . :-laf

 

[GWBourne]

47 psi here... and i need a larger charger. just running a van aaken C3. 2

Grant