16g/14b hybrid turbo question

[llauer76]

I realize that there have been similar questions to this in the past, but the available threads are rather old, and I figured maybe some new information is out there.

Anyways, I'm looking into buying a 1g tsi and the whole car looks pretty clean, but it did have one thing that seemed odd to me, the current owner claims that the turbo setup is an evo3 16g compressor housing mounted onto a 14b turbine housing. While I've read about these I haven't really seen anything comprehensive about them.

As far as reliability of the setup, both are genuine mhi parts so should it have the same reliability as a normal mhi turbo?
I know with the smaller turbine it will spool faster, but is a couple hundred rpm really worth losing top end?
I've read this type of setup tends to creep/spike quite often. What's the most efficient way to eliminate this without doing some real grinding?

Anyone with experience with this turbo's input would be really appreciated. Because once again, there just isn't a ton of information out there on this setup.

 

[synthetek]

The 14b housing is 6cm and the 16g is 7cm its a little bigger so it will have a little more lag but more top end.

 

[4Lurker4]

If it's just the hotside (turbine housing) that's been changed same reliability. As said above quicker spool, but you'll lose a bit up top when you have a 16g with a 14b hotside. http://www.dsmtuners.com/forums/tur...housing-increase-spool-time-16g-cartride.html

Personally, for a daily driver, I enjoy quicker spool more than top end. So it really depends on what it will be used for.

 

[llauer76]

The car will be my summer drive/weekend warrior. I'm just going for a streetable car with some bite. I'd like to end up in the 380-400hp zone. With the 14b hotside will this turbo hit capacity before I get there?

 

[Riceburning101]

the only thing i would be worried about is cracking the 14b turbine housing/hotside. its pretty common for them to do that. other than that the turbine wheel is the same except 16g usually have left hand threads so when it spins it would essentially tighten instead of loosen like the right hand threads from a 14b

 

[llauer76]

@riceburning - any foreseeable (sp) problems with that? The threads that is.

 

[synthetek]

The car will be my summer drive/weekend warrior. I'm just going for a streetable car with some bite. I'd like to end up in the 380-400hp zone. With the 14b hotside will this turbo hit capacity before I get there?

Its hard to make that with a big or EVO III 16g, the 6cm housing will probably not make it any easier.

 

[Riceburning101]

no its just a nice thing that mitsu did for the 16g and you would be maxing the 16g with the 7cm housing at roughly 350ish can go higher meth inject, cams, and basically call it more money but you really push the turbo which will cause it to wear out faster etc. I always build to exceed my original goals much like others on here and trust me it pays off in the end bc either hp bug bites or just more reliable bc everything isnt being pushed to its limits

 

[llauer76]

I've seen people push 380 with a big16. But it was about hitting capacity I didn't know how much the 14b turbine would affect it. That's alright though. I have this odd romance with the mhi 20g haha. They're a beautiful thing.

 

[JusMX141]

Lose the 6cm housing....replace it with a 7cm housing as the turbo should have had installed from the factory.

The 6cm housing is going to increase backpressure and raise EGT's causing turbine inducer damage as well as severe full-throttle surge issues which will shorten the life of the turbo- especially beyond 18psi or so.

Your thread title is a little misleading- you don't have a hybrid of any kind...you have a 16G with the incorrect turbine housing. Doesn't matter what turbine housing you have on the turbo, it's still a 16G.

 

[llauer76]

@jusmx141 which would be the more logical route- trade in the 7cm housing or go straight to the 20g? The car has all the needed supporting mods. Just interested in your opinion. Or even an alternative similar to the 20g?

Also, sorry about the misleading title, I wasn't sure of exactly how to phrase it. I knew it was an odd combination of parts. Not anything on the levels of the franks though.

 

[JusMX141]

Here's where shit gets confusing- up to a certain point, more exhaust is wastegated than passes through the housing. Figure if you're running 10psi, the wastegate is open almost immediately after the turbo builds any boost and stays open until you shift. More exhaust is diverted around the turbine wheel, so the smaller housing will be less-noticeable. Now say you're wanting to run 25psi...the gate stays closed longer and keeps more exhaust flow passing through the turbine housing. This is when you'll notice a larger restriction, especially as the RPM's climb.


Obviously you're going to make more power and do it easier with a 20G....that's the idea of going to a larger turbo. If you can afford to upgrade, by all means do so. The 20G is hands-down the most versatile street turbo on the market for our cars and has been that way over the course of three decades.

But since you don't own the car yet, this is all speculation. Drive it- see how it's tuned. It's going to feel faster than any non-turbo car so get some seat time before you make up your mind as to what direction you want to go turbo-wise.

 

[llauer76]

I get the general idea and reasoning behind why the 6cm hotside is restrictive at higher levels, I just wasn't exactly sure on how restrictive, but I'm thinking ill just leave the 16g on and keep it around the 15 psi it's running now to keep in safe boost levels until I can afford the 20g then. Thanks for your help guys.
And next time I'll try to keep my thread titles from being as misleading as this one is hah

 

[BCDSMatt]

Good idea, keep the 6cm until you really build power and then either go 20G for the power you want or at least swap for a 7cm.