Max boost level on the 5031E Often called the 50trim, cause i have one and...

[We're on Boost]

I can't give you a REAL answer but I can give you a theoretical answer based on the compressor map - where the compressor goes "off the map" into the "overspeed" region.

The compressor map I'm looking at is for a T04E 50 trim. This map was published by turbonetics so you might want to find a map that is guaranteed good for your PTE.

The idea is, pick a point on the upper right hand edge of the map, where you are maximizing boost and flow rate. The point I pick on this map is at Pressure ratio=3.2 and flow rate = 45 lbs per min. This info might be a little different for your PTE but I bet not much. The point I picked is kind of a guess, but hey, the max PR on the whole map is not much higher (3.4) and that is at about 40 lbs per minute, so you just need to guess where you will actually be running.

OK, going with PR of 3.2, the rest is easy:

3.2 x 13.7 = 43.8 psi absolute at the compressor outlet (~ 1psi drop in air filter/MAS)

43.8 - 14.7 = 29.14 psi gage pressure at compressor outlet

29.14 - 2 = 27.14 psi gage pressure in intake manifold (BOOST) (2psi drop in intercooler, piping, and throttle body)

So, about 27 psi boost puts you right on the edge of the overspeed region if you are flowing about 45 lbs per minute (450 crank hp). If you are flowing less air you could have more boost without going into overspeed, but of course airflow is what you want to make hp.

Anyway, this fits fine with the 25 to 30 advice you were getting from the other posters. Looks like anything over 27 is actually off the map and into "overspeed" which you can do up to a point. That's where things get a little iffy and if it were me I wouldn't push it past 30. If you want more boost get a turbo with higher PR capability, like a GT series garrett.

If you want a really good read on this subject look at www.turbobygarrett.com - look at "turbo tech" "turbo 103".

Gary

 

[silver bullit]

Max boost level on the 5031E Often called the 50trim, cause i have one and want to know the max boost level on this turbo? I know max power should be in the mid 400, but no one lists max boost.

 

[chicagoavenger]

There is no max boost because each car is different and people have different set ups so there is no magical number.

No one can tell you, Here is a tip get some type of logger/widband and turn up the boost untill YOU see it starting to pull timing or get knock etc etc. Each car is differnt some guys do fine at 17psi on a 16g on stock fuel and other knock at 14psi with the same set up. Who knows if you have pisswater 91 like we do or 93. Each car is different and anyone that tells you that you can run X amount of boost is guessing. Only YOU will be able to tell for sure. I

http://www.dsmtuners.com/forums/showthread.php?t=143197

 

[silver bullit]

I have 93 and 94 here and 110 at the track

 

[daren_p]

What exactly are you asking here? Are you asking how much boost your able to run? (If so refer to the above post) Or are you just asking what the max boost this turbo is able to run at? If so this answer will also vary. It depends on a few things such as internal vs external, engine setup, etc.

Edit: With the new reply, I would assume your talking about what you can run. Like was said, only a logger will tell you this, ever car is different. For starters I'd be getting some head studs if your looking to run a good amount of boost.

 

[silver bullit]

I am simply asking the max boost that this turbo should not go past ie: 14b max boost 22 psi, t-25 max boost 15 etc etc. I have the mods for this read my mods list.

I am not sand bagging, i am simply trying to find the safe limit of this turbo with out over boosting this turbo.

Thanks for the suggestion for arp i think i have em but it never hurts to check.

 

[daren_p]

I'm not sure of an exact number but I would imagine its in the 30's somewhere, though not sure if you will be able to sustain that kind of boost level if yours is an internally gated setup. Did notice your running 650 injectors, these will be maxed out well before you get close to the limits of your turbo & didn't see an upgraded fuel pump in your profile.

 

[silver bullit]

I'm not sure of an exact number but I would imagine its in the 30's somewhere, though not sure if you will be able to sustain that kind of boost level if yours is an internally gated setup. Did notice your running 650 injectors, these will be maxed out well before you get close to the limits of your turbo & didn't see an upgraded fuel pump in your profile.

Yes mine is internally gated, i do have a 255 and i am working on geting 1000cc injectors

 

[twack]

Well my 50 trim was on a shop stealth and they ran it at 36psi, i havnt yet

 

[1gDSM4g63]

Max boost level on the 5031E Often called the 50trim, cause i have one and want to know the max boost level on this turbo? I know max power should be in the mid 400, but no one lists max boost.

Check the turbo specs for how lbs it can take, but no one gets close to that. It all depends on what you've done to the rest of the engine to boost higher. Putting a gt42r and doing nothing to the engine doesn't give the engine 800hp.

 

[silver bullit]

Well my 50 trim was on a shop stealth and they ran it at 36psi, i havnt yet

Thanks for the info

Check the turbo specs for how lbs it can take, but no one gets close to that. It all depends on what you've done to the rest of the engine to boost higher. Putting a gt42r and doing nothing to the engine doesn't give the engine 800hp.

Yeah but this is not about the motor or other facters its about the turbo, nothing else matters.

 

[DGajre777]

Yes mine is internally gated, i do have a 255 and i am working on geting 1000cc injectors

I know a few people run 25 psi on internally gated 50 trims on 93 octane pump gas. As for what you should run, that depends on your car and your tune.

 

[IPT]

When I used to have a 50 trim I would run 30psi on race gas and on 93 octane I would run 23psi.

 

[silver bullit]

I know a few people run 25 psi on internally gated 50 trims on 93 octane pump gas. As for what you should run, that depends on your car and your tune.

When I used to have a 50 trim I would run 30psi on race gas and on 93 octane I would run 23psi.

Yeah i am thinking that is what i should run, but just trying to get the max boost on this turbo

 

[chicagoavenger]

I'm not sure of an exact number but I would imagine its in the 30's somewhere, though not sure if you will be able to sustain that kind of boost level if yours is an internally gated setup. Did notice your running 650 injectors, these will be maxed out well before you get close to the limits of your turbo & didn't see an upgraded fuel pump in your profile.

At 23psi my my PTE 660's where at 91%IDC just for info purposes.

 

[silver bullit]

At 23psi my my PTE 660's where at 91%IDC just for info purposes.

Thanks

 

[JOEY A]

Crank that boost up!


To many people half ass 50trim setups and run like 14 psi or somthing

 

[daren_p]

At 23psi my my PTE 660's where at 91%IDC just for info purposes.

Ya you really start to run out of injector quick once you start running larger then 16g sized turbos. With my 750's Im currently seeing 80% IDC with my 3052 at 21 psi & was over 85% before I added meth injection. When I bought them I never thought I would be anywears close to maxing them out 1000's are defently the route to go.

 

[92awddsm]

It looks like everyone on here is missing the point. He is trying get some educated opinions on what the efficiency range of the 50trim is, not what it is capable of doing on his or any other cars.

Any, yes you are pretty close. The "50" trim starts exceeding its efficiency range close to the 28-29 psi mark with race fuel(varies with different altitude and barometric pressure) where I am at. Power can still be made exceeding the efficiency but will eventually get to a point of blowing nothing but hot air and start causing knock regardless of fuel being used. Nitrous or meth injection can extend the efficiency of the turbo only because it helsp cool the intake charge to useable levels.