Turbo surging...help me pick the right turbo

[ShogunR32]

I need a turbo that is more efficient for the 1.8t. I currently have a garrett t3/t4 57 trim .63 ar. If I set my MBC to anything over 15psi, I surge real bad under WOT from 3rd gear and up. I heard about this turbo surging 20psi+ but never expected it to surge at this low psi. I had some other turbos in mind but just wanted to get everyone opinion before deciding.
Setup: 57 trim turbo
Stock AEB head
Eagle rods
ATP exhaust manifold with Tial 38mm waste gate
AEB pistons
550cc Bosch injectors
3.5" maf with United Motorsport tune(tuned for meth)
FMIC and exhaust
Snow performance meth kit
I am trying to stay on the cheaper side so all the turbos I had in mind are all oil cooled journal bearing:
1.Garrett 50 trim with .63ar--seems to be the most common solid choice from what I've read.
2.Precision 5557/5857--Not sure which one to pick as spool appears the same but 5857 has more potential.
3.Turbonetics 50 trim with .63 ar
Please let me know of any other turbos you guys think I should look at. I am still on stock displacement and want to avoid surge as much as possible.

[gottaBdope]

I heard that k03's are pretty good. Oddly enough I have one lying around...wanna trade?

Sorry, I have nothing constructive to say...:(

[1stb6]

GTRchop88 - i love you and respect your posts...but i do ALSO have K03 im willing to part off...like now. no play in it i swear!!!!

[ShogunR32]

I heard that k03's are pretty good. Oddly enough I have one lying around...wanna trade?

Sorry, I have nothing constructive to say...:(

I had a pile of k03s in my garage not too long ago.

[gottaBdope]

Baller. By lying around I meant chillin under my exhaust manifold. I need to upgrade...engines.

Good luck with your quest for the perfect turbo man.

[b6_quattro]

I have read the precision turbos with journal bearings are very hit and miss with quality. No personal experience but I thought I would just throw it out there.

[ShogunR32]

I have read the precision turbos with journal bearings are very hit and miss with quality. No personal experience but I thought I would just throw it out there.

I read that also but I think people were'nt using the right .065 restricitor in the oil feed line so they were blowing seals etc. I hope that is the reason at least.

[SourCream]

Correct me if im wrong, but I think a turbo surges when your exhaust fume does not exit fast enough.

What is your exhaust sizes? Because if you have a 3" downpipe and at least a 2.5" cat back (most common setup) I think you should be okay.

If it's not the problem, I can't help you more than that.. Sorry.

[ShogunR32]

Correct me if im wrong, but I think a turbo surges when your exhaust fume does not exit fast enough.

What is your exhaust sizes? Because if you have a 3" downpipe and at least a 2.5" cat back (most common setup) I think you should be okay.

If it's not the problem, I can't help you more than that.. Sorry.

The backside of the turbo is 2.5" 4 bolt to a 2.5"dp. The turbo is surging because my car can't injest the amount of air this turbo spools at that low RPM. I shouldve looked at this turbo's compressor map better.This is true compressor surge, unlike dv/bov fluttler or even wastegate flutter.

[gottaBdope]

So...you can't increase your in flow ---> ?

[ShogunR32]

So...you can't increase your in flow ---> ?

The turbo doesn't necessarily need a 3" dp(back side of turbo is 2.5 4 bolt"). If anything, the only thing that can fix my surging problem is to make the boost come on slower. Maybe getting an .82ar exhaust side housing on it or a custom anti-surge compressor housing. I don't want to chance all that and just get another turbo that I know won't surge.

[gottaBdope]

I meant intake flow. Shove more sh!t in.


Sent by LT Dan's missing legs.

[ShogunR32]

I don't know. My core is 3" and my piping is 2.5". I am running the stock throttle body and AEB inatke manifold.

[gottaBdope]

Yeah, I don't know what's necessary. I was just stating the obvious, lol...kinda hoping someone would chime in so I could learn me a lil sumfin.

[SleeperAvant]

I have heard the 57 trims surge. My 50 trim only surges in 5th gear and very slightly in 4th, but that's probably due to my stock displacement, stock head, stock intake manifold, stock throttlebody.

You could try getting an anti-surge compressor housing for your 57 trim from ATPturbo.com

[screwball]

I've got a 50 trim .63 a/r and .48 a/r with some miles I'm parting. Older Garrett unit.

[SleeperAvant]

I've got a 50 trim .63 a/r and .48 a/r with some miles I'm parting. Older Garrett unit.

How did the .48 spool?

[ShogunR32]

I have heard the 57 trims surge. My 50 trim only surges in 5th gear and very slightly in 4th, but that's probably due to my stock displacement, stock head, stock intake manifold, stock throttlebody.

You could try getting an anti-surge compressor housing for your 57 trim from ATPturbo.com

Yeah Im on a stock aeb head and on stock displacement. I haven't been able to find an anti surge housing for this turbo.

[J_L]

the 57 trims do surge, this is old news ,someone should have told you. The 50 trims do not surge, and is realy fun with a 63a/r housing.
But in this case, seeing you have done rods and have a AEB head, I would run the PTE billet 5857 or 5557.
Cost on the PTE`s are about the same as a 50 trim. Good luck:)

[Charlie240sxt]

T3T4 50 trims are great turbos on the cheap, how much are you looking at dropping on a new turbo?? And would you consenter a used turbo??

[screwball]

How did the .48 spool?

.48 for me spooled early, but I was big port head, aftermarket IM and 70mm TB. I saw 22-24psi at 36-3700 rpms

.63 a/r on my stuff was doing 22-24psi by 38-3900 which should be 4200 or so on small port stuff from my reading.

[ShogunR32]

the 57 trims do surge, this is old news ,someone should have told you. The 50 trims do not surge, and is realy fun with a 63a/r housing.
But in this case, seeing you have done rods and have a AEB head, I would run the PTE billet 5857 or 5557.
Cost on the PTE`s are about the same as a 50 trim. Good luck:)

Yeah I think Im going to go with the PTE 5857/5557. Do you know of anyone running that turbo on ATP log manifold? im worried about fitment.

T3T4 50 trims are great turbos on the cheap, how much are you looking at dropping on a new turbo?? And would you consenter a used turbo??

I would consider a used turbo. Got one for sale?

[diagnosticator]

Have you considered running less boost? Try setting the max boost to the pressure just below where the surging begins to occur. Higher boost is not always the best way to go.

[screwball]

The 57 trim's just a bad match for our motors. 58/57 & 55/57 should have similar spool, but be wary of the JB PTEs, the CBBs are robust, but lotsa talk about the JBs being wonky.