Just thought id leave that there^^^
I hope thats not a sign of things to come!
Boy its sure got hot though! That comp wheel has been fried!

 

Listen, you are entitled to your opinion whatever it is , I'm not although going to argue bull**** with you just because you want to look good on a forum, you are ignorant on the matter and thus wrong on everything you said, period. Instead of asking the right questions, you jump to ridiculously false assumptions. The gt and t series turbines share the same aero design and gtw series does use the redesigned p-trim, hence why the specific line of turbos is called gtw and not tw i.e. The smaller t series turbines are of the same efficiency as their gt counterparts and have a comparatively efficient enough aero to work in an excellent way with the gtx1 aero type compressor wheel on the gtw line, repeating myself in an effort to stress this enough, they do have the same efficiency as their counterparts used in the gt/gtx1/2 lines of turbos, the only one that needed to be replaced with a new design wheel was the p-trim to raise the choke point of the wheel.

The first picture I posted of the p-trim, is indeed of the redesigned p-trim, on the last link you can see their first one. Garrett did redesigned the specific turbine wheel, and if it does make perfect sense to you or not it's something that has nothing to do with garrett, it makes perfect sense to them and to me, if you fail to see that, that is your problem not theirs.
They re-designed the p-trim around 10 years ago, then they offered the gtx3584rs on the same design turbine 2-3 years back, the reason they did not use the same older design turbine as they have used on the gt/gtx1/2 3582r is becaused they paired it with a 67mm comp inducer wheel, still using the older design on the gtx2 3582r, and now they brought out another one to fill in the void in the small-compact turbo line with the g-series, this is what they did based on reality, I'm also done discussing your ignorance on the matter.











Marios

 

Although the above can happen to any alum compressor wheel made to date, what might differ here is at what rpm and heat the damage occurred.
On the gtx 2 turbos they have used a different alum alloy than the 2618 they used on their gtx1 and gtw line of turbos, along with the slight improvement of aero. They also made the wheels of less mass, very slightly thinner blades. I suspect their new g-series compressor wheel shares the same principles and material with certain differentiation in aerodynamic design.









Marios

 

where did you find that?

 

That compressor appears to have ingested something. The blades are torn up and bent near the hub. if the shaft had failed first, you'd only see damage from hitting the housing.

 

The blades have damage on all their cm2 area, from the tip to the hub. The inducer edge is severely damaged and distorted, my estimation is that the shaft and bearing system has failed at high speed, forcing the blades to hit the housing, crashing and distorting the molecular structure of the specific alloy used into what appears in the above photo. The excessive heat for the particular alloys used, that could have been present and could probably be one of the reasons the turbo failed, aided the molecular destruction of the wheels. A closer pic would reveal the damage to the comp housing. I have seen wheels get damaged like these from shaft failure. A foreign object could cause similar damage, and there is no conclusive evidence that relates to the place of damage on a wheel that could dictate whether a foreign object was definitely the culprit or not. I have seen damaged compressor or turbine wheels by foreign objects in different ways, depending on the foreign object, but in all cases there was always one common characteristic, relatively large chunks of metal were cut off from the blades, while on the non-foreign object damage, being damaged by a piece of broken alum alloy from the compressor wheel itself, material missing was not always the case, but there could be material distortion and hairline cracks instead. On examining the above specific picture more closely, there is certain material missing, so the case of the wheel being obstructed from its function by a foreign object is not excluded either, but the damage on the comp wheel could at the same time have been caused by one of its broken pieces. In order for me to accurately identify what exactly happened, I would have to see the turbo up close.









Marios

 

 

Apart from the above morron, anyone else who also wants any further info or to verify what I said , you can email garrett.




Let's see some real-world results from these little turbos.







Marios

 

They suspect overspeed

 

yes yes, I recall our conversation.

I'm thinking about a little more power at the moment since everyone and their grandmother is telling me to eventually use 10:1 CR, VVTI and a 3.4 stroker *rollseyes* and i've seen some pretty sick dynos.
same thing for evo's , 10:1, Mivec, 2.4 stroker.

 

Yup. Seems they didn't have a good boost control system and overspun the turbo. Enough power to spin the tires in 4th..... sheesh. Probably just a weeeee bit of overspeed

 

A note on the Garrett turbine wheels. The GT/GTX/GTX Gen2 30-35 frame size turbos use a wheel design called UHP which has been around for quite a long time. The GT28RS and GTX/GTX28 Gen 2 use the NS111. The GTX3584RS uses a newer, unique to the 3584RS, higher flow turbine wheel design compared to the UHP in the GTX30-35 turbos. The GTX3584RS goal was to be a 1000 crank hp turbo in a GT35 frame size and therefore needed higher flow than the UHP could offer. So, a new design was made. If you look at the turbine maps for the 3582 and 3584RS in a 1.01 A/R, you'll notice the old UHP turbine flows ~29.5lbs/min vs the 3584RS turbine (sorry, don't know the designation) flows about 31lbs/min. The new G-series turbine wheel is another completely new design. The turbine efficiency of the G-series turbine is significantly better than the same-sized NS111.

 

Adam LZ has blown up... everything. I'm sure it was a setup error. Probably a boost leak.

 

good info, I've got a set of gen 2 2860's for my Z32, gorgeous little things..
I've been looking into Dyno's for the GTX35's and i've seen them spooling kinda slow on that big 3L. Cant imagine they'd spool anywhere quickly on a 2 / 2.4

for the G Series turbos it's the larger turbine and compressor that's mainly allowing them to push more power than their GTX counterparts right?

 

The compressor is no larger, and the turbine is only a slightly larger trim....